diff --git a/crates/gen_lsp_server/src/lib.rs b/crates/gen_lsp_server/src/lib.rs
index 645728a573f..e45a6b5e27c 100644
--- a/crates/gen_lsp_server/src/lib.rs
+++ b/crates/gen_lsp_server/src/lib.rs
@@ -59,7 +59,6 @@
 //! }
 //! ```
 
-
 #[macro_use]
 extern crate failure;
 #[macro_use]
@@ -74,16 +73,16 @@ extern crate languageserver_types;
 mod msg;
 mod stdio;
 
-use crossbeam_channel::{Sender, Receiver};
+use crossbeam_channel::{Receiver, Sender};
 use languageserver_types::{
-    ServerCapabilities, InitializeResult, InitializeParams,
+    notification::{Exit, Initialized},
     request::{Initialize, Shutdown},
-    notification::{Initialized, Exit},
+    InitializeParams, InitializeResult, ServerCapabilities,
 };
 
 pub type Result<T> = ::std::result::Result<T, failure::Error>;
 pub use {
-    msg::{RawMessage, RawRequest, RawResponse, RawResponseError, RawNotification, ErrorCode},
+    msg::{ErrorCode, RawMessage, RawNotification, RawRequest, RawResponse, RawResponseError},
     stdio::{stdio_transport, Threads},
 };
 
@@ -97,11 +96,7 @@ pub fn run_server(
     caps: ServerCapabilities,
     receiver: Receiver<RawMessage>,
     sender: Sender<RawMessage>,
-    server: impl FnOnce(
-        InitializeParams,
-        &Receiver<RawMessage>,
-        &Sender<RawMessage>,
-    ) -> Result<()>,
+    server: impl FnOnce(InitializeParams, &Receiver<RawMessage>, &Sender<RawMessage>) -> Result<()>,
 ) -> Result<()> {
     info!("lsp server initializes");
     let params = initialize(&receiver, &sender, caps)?;
@@ -109,12 +104,10 @@ pub fn run_server(
     server(params, &receiver, &sender)?;
     info!("lsp server waiting for exit notification");
     match receiver.recv() {
-        Some(RawMessage::Notification(n)) => {
-            n.cast::<Exit>().map_err(|n| format_err!(
-                "unexpected notification during shutdown: {:?}", n
-            ))?
-        }
-        m => bail!("unexpected message during shutdown: {:?}", m)
+        Some(RawMessage::Notification(n)) => n
+            .cast::<Exit>()
+            .map_err(|n| format_err!("unexpected notification during shutdown: {:?}", n))?,
+        m => bail!("unexpected message during shutdown: {:?}", m),
     }
     info!("lsp server shutdown complete");
     Ok(())
@@ -141,17 +134,15 @@ fn initialize(
         Some(RawMessage::Request(req)) => match req.cast::<Initialize>() {
             Err(req) => bail!("expected initialize request, got {:?}", req),
             Ok(req) => req,
-        }
-        msg =>
-            bail!("expected initialize request, got {:?}", msg),
+        },
+        msg => bail!("expected initialize request, got {:?}", msg),
     };
     let resp = RawResponse::ok::<Initialize>(id, &InitializeResult { capabilities: caps });
     sender.send(RawMessage::Response(resp));
     match receiver.recv() {
         Some(RawMessage::Notification(n)) => {
-            n.cast::<Initialized>().map_err(|_| format_err!(
-                "expected initialized notification"
-            ))?;
+            n.cast::<Initialized>()
+                .map_err(|_| format_err!("expected initialized notification"))?;
         }
         _ => bail!("expected initialized notification"),
     }
diff --git a/crates/gen_lsp_server/src/msg.rs b/crates/gen_lsp_server/src/msg.rs
index 7fcac6f6d38..e0d0aeab55c 100644
--- a/crates/gen_lsp_server/src/msg.rs
+++ b/crates/gen_lsp_server/src/msg.rs
@@ -1,11 +1,8 @@
 use std::io::{BufRead, Write};
 
-use serde_json::{Value, from_str, to_string, from_value, to_value};
-use serde::{Serialize, de::DeserializeOwned};
-use languageserver_types::{
-    request::Request,
-    notification::Notification,
-};
+use languageserver_types::{notification::Notification, request::Request};
+use serde::{de::DeserializeOwned, Serialize};
+use serde_json::{from_str, from_value, to_string, to_value, Value};
 
 use Result;
 
@@ -81,7 +78,10 @@ impl RawMessage {
             #[serde(flatten)]
             msg: RawMessage,
         }
-        let text = to_string(&JsonRpc { jsonrpc: "2.0", msg: self })?;
+        let text = to_string(&JsonRpc {
+            jsonrpc: "2.0",
+            msg: self,
+        })?;
         write_msg_text(w, &text)?;
         Ok(())
     }
@@ -115,8 +115,9 @@ impl RawRequest {
 
 impl RawResponse {
     pub fn ok<R>(id: u64, result: &R::Result) -> RawResponse
-    where R: Request,
-          R::Result: Serialize,
+    where
+        R: Request,
+        R::Result: Serialize,
     {
         RawResponse {
             id,
@@ -125,7 +126,11 @@ impl RawResponse {
         }
     }
     pub fn err(id: u64, code: i32, message: String) -> RawResponse {
-        let error = RawResponseError { code, message, data: None };
+        let error = RawResponseError {
+            code,
+            message,
+            data: None,
+        };
         RawResponse {
             id,
             result: None,
@@ -174,7 +179,9 @@ fn read_msg_text(inp: &mut impl BufRead) -> Result<Option<String>> {
         }
         let mut parts = buf.splitn(2, ": ");
         let header_name = parts.next().unwrap();
-        let header_value = parts.next().ok_or_else(|| format_err!("malformed header: {:?}", buf))?;
+        let header_value = parts
+            .next()
+            .ok_or_else(|| format_err!("malformed header: {:?}", buf))?;
         if header_name == "Content-Length" {
             size = Some(header_value.parse::<usize>()?);
         }
diff --git a/crates/gen_lsp_server/src/stdio.rs b/crates/gen_lsp_server/src/stdio.rs
index 81397bb2a0a..3d8a1712abe 100644
--- a/crates/gen_lsp_server/src/stdio.rs
+++ b/crates/gen_lsp_server/src/stdio.rs
@@ -1,11 +1,9 @@
 use std::{
+    io::{stdin, stdout},
     thread,
-    io::{
-        stdout, stdin,
-    },
 };
 
-use crossbeam_channel::{Receiver, Sender, bounded};
+use crossbeam_channel::{bounded, Receiver, Sender};
 
 use {RawMessage, Result};
 
diff --git a/crates/ra_analysis/src/db.rs b/crates/ra_analysis/src/db.rs
index c6957723399..042dde1aca9 100644
--- a/crates/ra_analysis/src/db.rs
+++ b/crates/ra_analysis/src/db.rs
@@ -1,16 +1,17 @@
+use crate::{
+    module_map::{ModuleDescriptorQuery, ModuleTreeQuery, ModulesDatabase},
+    symbol_index::SymbolIndex,
+    FileId, FileResolverImp,
+};
+use ra_editor::LineIndex;
+use ra_syntax::File;
+use rustc_hash::FxHashSet;
+use salsa;
+
 use std::{
     fmt,
-    sync::Arc,
     hash::{Hash, Hasher},
-};
-use salsa;
-use rustc_hash::FxHashSet;
-use ra_syntax::File;
-use ra_editor::{LineIndex};
-use crate::{
-    symbol_index::SymbolIndex,
-    module_map::{ModulesDatabase, ModuleTreeQuery, ModuleDescriptorQuery},
-    FileId, FileResolverImp,
+    sync::Arc,
 };
 
 #[derive(Default)]
diff --git a/crates/ra_analysis/src/descriptors.rs b/crates/ra_analysis/src/descriptors.rs
index 8d9f38ca592..6f26f9935dd 100644
--- a/crates/ra_analysis/src/descriptors.rs
+++ b/crates/ra_analysis/src/descriptors.rs
@@ -1,41 +1,34 @@
-use std::{
-    collections::BTreeMap,
+use crate::{imp::FileResolverImp, FileId};
+use ra_syntax::{
+    ast::{self, AstNode, NameOwner},
+    text_utils::is_subrange,
+    SmolStr,
 };
 use relative_path::RelativePathBuf;
-use ra_syntax::{
-    SmolStr,
-    ast::{self, NameOwner, AstNode},
-    text_utils::is_subrange
-};
-use crate::{
-    FileId,
-    imp::FileResolverImp,
-};
+
+use std::collections::BTreeMap;
 
 #[derive(Debug, PartialEq, Eq, Hash)]
 pub struct ModuleDescriptor {
-    pub submodules: Vec<Submodule>
+    pub submodules: Vec<Submodule>,
 }
 
 impl ModuleDescriptor {
     pub fn new(root: ast::Root) -> ModuleDescriptor {
-        let submodules = modules(root)
-            .map(|(name, _)| Submodule { name })
-            .collect();
+        let submodules = modules(root).map(|(name, _)| Submodule { name }).collect();
 
-        ModuleDescriptor { submodules } }
+        ModuleDescriptor { submodules }
+    }
 }
 
-fn modules<'a>(root: ast::Root<'a>) -> impl Iterator<Item=(SmolStr, ast::Module<'a>)> {
-    root
-        .modules()
-        .filter_map(|module| {
-            let name = module.name()?.text();
-            if !module.has_semi() {
-                return None;
-            }
-            Some((name, module))
-        })
+fn modules<'a>(root: ast::Root<'a>) -> impl Iterator<Item = (SmolStr, ast::Module<'a>)> {
+    root.modules().filter_map(|module| {
+        let name = module.name()?.text();
+        if !module.has_semi() {
+            return None;
+        }
+        Some((name, module))
+    })
 }
 
 #[derive(Clone, Hash, PartialEq, Eq, Debug)]
@@ -56,7 +49,7 @@ struct Node(usize);
 struct NodeData {
     file_id: FileId,
     links: Vec<Link>,
-    parents: Vec<Link>
+    parents: Vec<Link>,
 }
 
 #[derive(Clone, Copy, PartialEq, Eq, Hash, Debug)]
@@ -69,7 +62,6 @@ struct LinkData {
     problem: Option<Problem>,
 }
 
-
 #[derive(Clone, Debug, Hash, PartialEq, Eq)]
 pub enum Problem {
     UnresolvedModule {
@@ -78,16 +70,18 @@ pub enum Problem {
     NotDirOwner {
         move_to: RelativePathBuf,
         candidate: RelativePathBuf,
-    }
+    },
 }
 
 impl ModuleTreeDescriptor {
     pub(crate) fn new<'a>(
-        files: impl Iterator<Item=(FileId, &'a ModuleDescriptor)> + Clone,
+        files: impl Iterator<Item = (FileId, &'a ModuleDescriptor)> + Clone,
         file_resolver: &FileResolverImp,
     ) -> ModuleTreeDescriptor {
         let mut file_id2node = BTreeMap::new();
-        let mut nodes: Vec<NodeData> = files.clone().enumerate()
+        let mut nodes: Vec<NodeData> = files
+            .clone()
+            .enumerate()
             .map(|(idx, (file_id, _))| {
                 file_id2node.insert(file_id, Node(idx));
                 NodeData {
@@ -120,20 +114,19 @@ impl ModuleTreeDescriptor {
                     points_to,
                     problem,
                 })
-
             }
         }
 
         ModuleTreeDescriptor {
-            nodes, links, file_id2node
+            nodes,
+            links,
+            file_id2node,
         }
     }
 
     pub(crate) fn parent_modules(&self, file_id: FileId) -> Vec<Link> {
         let node = self.file_id2node[&file_id];
-        self.node(node)
-            .parents
-            .clone()
+        self.node(node).parents.clone()
     }
     pub(crate) fn child_module_by_name(&self, file_id: FileId, name: &str) -> Vec<FileId> {
         let node = self.file_id2node[&file_id];
@@ -141,10 +134,18 @@ impl ModuleTreeDescriptor {
             .links
             .iter()
             .filter(|it| it.name(self) == name)
-            .flat_map(|link| link.points_to(self).iter().map(|&node| self.node(node).file_id))
+            .flat_map(|link| {
+                link.points_to(self)
+                    .iter()
+                    .map(|&node| self.node(node).file_id)
+            })
             .collect()
     }
-    pub(crate) fn problems<'a, 'b>(&'b self, file_id: FileId, root: ast::Root<'a>) -> Vec<(ast::Name<'a>, &'b Problem)> {
+    pub(crate) fn problems<'a, 'b>(
+        &'b self,
+        file_id: FileId,
+        root: ast::Root<'a>,
+    ) -> Vec<(ast::Name<'a>, &'b Problem)> {
         let node = self.file_id2node[&file_id];
         self.node(node)
             .links
@@ -176,7 +177,11 @@ impl Link {
     fn points_to(self, tree: &ModuleTreeDescriptor) -> &[Node] {
         &tree.link(self).points_to
     }
-    pub(crate) fn bind_source<'a>(self, tree: &ModuleTreeDescriptor, root: ast::Root<'a>) -> ast::Module<'a> {
+    pub(crate) fn bind_source<'a>(
+        self,
+        tree: &ModuleTreeDescriptor,
+        root: ast::Root<'a>,
+    ) -> ast::Module<'a> {
         modules(root)
             .filter(|(name, _)| name == &tree.link(self).name)
             .next()
@@ -185,22 +190,21 @@ impl Link {
     }
 }
 
-
 fn resolve_submodule(
     file_id: FileId,
     name: &SmolStr,
-    file_resolver: &FileResolverImp
+    file_resolver: &FileResolverImp,
 ) -> (Vec<FileId>, Option<Problem>) {
     let mod_name = file_resolver.file_stem(file_id);
-    let is_dir_owner =
-        mod_name == "mod" || mod_name == "lib" || mod_name == "main";
+    let is_dir_owner = mod_name == "mod" || mod_name == "lib" || mod_name == "main";
 
     let file_mod = RelativePathBuf::from(format!("../{}.rs", name));
     let dir_mod = RelativePathBuf::from(format!("../{}/mod.rs", name));
     let points_to: Vec<FileId>;
     let problem: Option<Problem>;
     if is_dir_owner {
-        points_to = [&file_mod, &dir_mod].iter()
+        points_to = [&file_mod, &dir_mod]
+            .iter()
             .filter_map(|path| file_resolver.resolve(file_id, path))
             .collect();
         problem = if points_to.is_empty() {
@@ -223,7 +227,7 @@ fn resolve_submodule(
 #[derive(Debug, Clone)]
 pub struct FnDescriptor {
     pub name: String,
-    pub label : String,
+    pub label: String,
     pub ret_type: Option<String>,
     pub params: Vec<String>,
 }
@@ -233,9 +237,11 @@ impl FnDescriptor {
         let name = node.name()?.text().to_string();
 
         // Strip the body out for the label.
-        let label : String = if let Some(body) = node.body() {
+        let label: String = if let Some(body) = node.body() {
             let body_range = body.syntax().range();
-            let label : String = node.syntax().children()
+            let label: String = node
+                .syntax()
+                .children()
                 .filter(|child| !is_subrange(body_range, child.range()))
                 .map(|node| node.text().to_string())
                 .collect();
@@ -251,7 +257,7 @@ impl FnDescriptor {
             name,
             ret_type,
             params,
-            label
+            label,
         })
     }
 
@@ -264,9 +270,11 @@ impl FnDescriptor {
 
             // Maybe use param.pat here? See if we can just extract the name?
             //res.extend(param_list.params().map(|p| p.syntax().text().to_string()));
-            res.extend(param_list.params()
-                .filter_map(|p| p.pat())
-                .map(|pat| pat.syntax().text().to_string())
+            res.extend(
+                param_list
+                    .params()
+                    .filter_map(|p| p.pat())
+                    .map(|pat| pat.syntax().text().to_string()),
             );
         }
         res
diff --git a/crates/ra_analysis/src/imp.rs b/crates/ra_analysis/src/imp.rs
index 5efcaeca04a..f1403cb5d78 100644
--- a/crates/ra_analysis/src/imp.rs
+++ b/crates/ra_analysis/src/imp.rs
@@ -1,32 +1,31 @@
 use std::{
-    sync::{
-        Arc,
-    },
-    hash::{Hash, Hasher},
-    fmt,
     collections::VecDeque,
+    fmt,
+    hash::{Hash, Hasher},
     iter,
+    sync::Arc,
 };
 
+use ra_editor::{self, find_node_at_offset, resolve_local_name, FileSymbol, LineIndex, LocalEdit};
+use ra_syntax::{
+    ast::{self, ArgListOwner, Expr, NameOwner},
+    AstNode, File, SmolStr,
+    SyntaxKind::*,
+    SyntaxNodeRef, TextRange, TextUnit,
+};
 use relative_path::RelativePath;
 use rustc_hash::FxHashSet;
-use ra_editor::{self, FileSymbol, LineIndex, find_node_at_offset, LocalEdit, resolve_local_name};
-use ra_syntax::{
-    TextUnit, TextRange, SmolStr, File, AstNode, SyntaxNodeRef,
-    SyntaxKind::*,
-    ast::{self, NameOwner, ArgListOwner, Expr},
-};
 
 use crate::{
-    FileId, FileResolver, Query, Diagnostic, SourceChange, SourceFileEdit, Position, FileSystemEdit,
-    JobToken, CrateGraph, CrateId,
-    roots::{SourceRoot, ReadonlySourceRoot, WritableSourceRoot},
     descriptors::{FnDescriptor, ModuleTreeDescriptor, Problem},
+    roots::{ReadonlySourceRoot, SourceRoot, WritableSourceRoot},
+    CrateGraph, CrateId, Diagnostic, FileId, FileResolver, FileSystemEdit, JobToken, Position,
+    Query, SourceChange, SourceFileEdit,
 };
 
 #[derive(Clone, Debug)]
 pub(crate) struct FileResolverImp {
-    inner: Arc<FileResolver>
+    inner: Arc<FileResolver>,
 }
 
 impl PartialEq for FileResolverImp {
@@ -35,8 +34,7 @@ impl PartialEq for FileResolverImp {
     }
 }
 
-impl Eq for FileResolverImp {
-}
+impl Eq for FileResolverImp {}
 
 impl Hash for FileResolverImp {
     fn hash<H: Hasher>(&self, hasher: &mut H) {
@@ -67,17 +65,23 @@ impl Default for FileResolverImp {
             fn file_stem(&self, _file_: FileId) -> String {
                 panic!("file resolver not set")
             }
-            fn resolve(&self, _file_id: FileId, _path: &::relative_path::RelativePath) -> Option<FileId> {
+            fn resolve(
+                &self,
+                _file_id: FileId,
+                _path: &::relative_path::RelativePath,
+            ) -> Option<FileId> {
                 panic!("file resolver not set")
             }
         }
-        FileResolverImp { inner: Arc::new(DummyResolver) }
+        FileResolverImp {
+            inner: Arc::new(DummyResolver),
+        }
     }
 }
 
 #[derive(Debug)]
 pub(crate) struct AnalysisHostImpl {
-    data: WorldData
+    data: WorldData,
 }
 
 impl AnalysisHostImpl {
@@ -91,13 +95,13 @@ impl AnalysisHostImpl {
             data: self.data.clone(),
         }
     }
-    pub fn change_files(&mut self, changes: &mut dyn Iterator<Item=(FileId, Option<String>)>) {
-        self.data_mut()
-            .root.apply_changes(changes, None);
+    pub fn change_files(&mut self, changes: &mut dyn Iterator<Item = (FileId, Option<String>)>) {
+        self.data_mut().root.apply_changes(changes, None);
     }
     pub fn set_file_resolver(&mut self, resolver: FileResolverImp) {
         self.data_mut()
-            .root.apply_changes(&mut iter::empty(), Some(resolver));
+            .root
+            .apply_changes(&mut iter::empty(), Some(resolver));
     }
     pub fn set_crate_graph(&mut self, graph: CrateGraph) {
         let mut visited = FxHashSet::default();
@@ -131,7 +135,12 @@ impl AnalysisImpl {
         if self.data.root.contains(file_id) {
             return &self.data.root;
         }
-        &**self.data.libs.iter().find(|it| it.contains(file_id)).unwrap()
+        &**self
+            .data
+            .libs
+            .iter()
+            .find(|it| it.contains(file_id))
+            .unwrap()
     }
     pub fn file_syntax(&self, file_id: FileId) -> File {
         self.root(file_id).syntax(file_id)
@@ -142,18 +151,17 @@ impl AnalysisImpl {
     pub fn world_symbols(&self, query: Query, token: &JobToken) -> Vec<(FileId, FileSymbol)> {
         let mut buf = Vec::new();
         if query.libs {
-            self.data.libs.iter()
-                .for_each(|it| it.symbols(&mut buf));
+            self.data.libs.iter().for_each(|it| it.symbols(&mut buf));
         } else {
             self.data.root.symbols(&mut buf);
         }
         query.search(&buf, token)
-
     }
     pub fn parent_module(&self, file_id: FileId) -> Vec<(FileId, FileSymbol)> {
         let root = self.root(file_id);
         let module_tree = root.module_tree();
-        module_tree.parent_modules(file_id)
+        module_tree
+            .parent_modules(file_id)
             .iter()
             .map(|link| {
                 let file_id = link.owner(&module_tree);
@@ -203,15 +211,17 @@ impl AnalysisImpl {
         let file = root.syntax(file_id);
         let syntax = file.syntax();
         if let Some(name_ref) = find_node_at_offset::<ast::NameRef>(syntax, offset) {
-
             // First try to resolve the symbol locally
             if let Some((name, range)) = resolve_local_name(&file, offset, name_ref) {
                 let mut vec = vec![];
-                vec.push((file_id, FileSymbol {
-                    name,
-                    node_range: range,
-                    kind : NAME
-                }));
+                vec.push((
+                    file_id,
+                    FileSymbol {
+                        name,
+                        node_range: range,
+                        kind: NAME,
+                    },
+                ));
 
                 return vec;
             } else {
@@ -224,17 +234,21 @@ impl AnalysisImpl {
                 if module.has_semi() {
                     let file_ids = self.resolve_module(&*module_tree, file_id, module);
 
-                    let res = file_ids.into_iter().map(|id| {
-                        let name = module.name()
-                            .map(|n| n.text())
-                            .unwrap_or_else(|| SmolStr::new(""));
-                        let symbol = FileSymbol {
-                            name,
-                            node_range: TextRange::offset_len(0.into(), 0.into()),
-                            kind: MODULE,
-                        };
-                        (id, symbol)
-                    }).collect();
+                    let res = file_ids
+                        .into_iter()
+                        .map(|id| {
+                            let name = module
+                                .name()
+                                .map(|n| n.text())
+                                .unwrap_or_else(|| SmolStr::new(""));
+                            let symbol = FileSymbol {
+                                name,
+                                node_range: TextRange::offset_len(0.into(), 0.into()),
+                                kind: MODULE,
+                            };
+                            (id, symbol)
+                        })
+                        .collect();
 
                     return res;
                 }
@@ -245,12 +259,16 @@ impl AnalysisImpl {
 
     pub fn diagnostics(&self, file_id: FileId) -> Vec<Diagnostic> {
         let root = self.root(file_id);
-        let module_tree  = root.module_tree();
+        let module_tree = root.module_tree();
         let syntax = root.syntax(file_id);
 
         let mut res = ra_editor::diagnostics(&syntax)
             .into_iter()
-            .map(|d| Diagnostic { range: d.range, message: d.msg, fix: None })
+            .map(|d| Diagnostic {
+                range: d.range,
+                message: d.msg,
+                fix: None,
+            })
             .collect::<Vec<_>>();
 
         for (name_node, problem) in module_tree.problems(file_id, syntax.ast()) {
@@ -273,8 +291,14 @@ impl AnalysisImpl {
                     }
                 }
                 Problem::NotDirOwner { move_to, candidate } => {
-                    let move_file = FileSystemEdit::MoveFile { file: file_id, path: move_to.clone() };
-                    let create_file = FileSystemEdit::CreateFile { anchor: file_id, path: move_to.join(candidate) };
+                    let move_file = FileSystemEdit::MoveFile {
+                        file: file_id,
+                        path: move_to.clone(),
+                    };
+                    let create_file = FileSystemEdit::CreateFile {
+                        anchor: file_id,
+                        path: move_to.join(candidate),
+                    };
                     let fix = SourceChange {
                         label: "move file and create module".to_string(),
                         source_file_edits: Vec::new(),
@@ -297,23 +321,34 @@ impl AnalysisImpl {
         let file = self.file_syntax(file_id);
         let offset = range.start();
         let actions = vec![
-            ("flip comma", ra_editor::flip_comma(&file, offset).map(|f| f())),
-            ("add `#[derive]`", ra_editor::add_derive(&file, offset).map(|f| f())),
+            (
+                "flip comma",
+                ra_editor::flip_comma(&file, offset).map(|f| f()),
+            ),
+            (
+                "add `#[derive]`",
+                ra_editor::add_derive(&file, offset).map(|f| f()),
+            ),
             ("add impl", ra_editor::add_impl(&file, offset).map(|f| f())),
-            ("introduce variable", ra_editor::introduce_variable(&file, range).map(|f| f())),
+            (
+                "introduce variable",
+                ra_editor::introduce_variable(&file, range).map(|f| f()),
+            ),
         ];
-        actions.into_iter()
+        actions
+            .into_iter()
             .filter_map(|(name, local_edit)| {
-                Some(SourceChange::from_local_edit(
-                    file_id, name, local_edit?,
-                ))
+                Some(SourceChange::from_local_edit(file_id, name, local_edit?))
             })
             .collect()
     }
 
-    pub fn resolve_callable(&self, file_id: FileId, offset: TextUnit, token: &JobToken)
-        -> Option<(FnDescriptor, Option<usize>)> {
-
+    pub fn resolve_callable(
+        &self,
+        file_id: FileId,
+        offset: TextUnit,
+        token: &JobToken,
+    ) -> Option<(FnDescriptor, Option<usize>)> {
         let root = self.root(file_id);
         let file = root.syntax(file_id);
         let syntax = file.syntax();
@@ -332,9 +367,7 @@ impl AnalysisImpl {
                         let mut current_parameter = None;
 
                         let num_params = descriptor.params.len();
-                        let has_self = fn_def.param_list()
-                            .and_then(|l| l.self_param())
-                            .is_some();
+                        let has_self = fn_def.param_list().and_then(|l| l.self_param()).is_some();
 
                         if num_params == 1 {
                             if !has_self {
@@ -350,8 +383,11 @@ impl AnalysisImpl {
                                 let start = arg_list.syntax().range().start();
 
                                 let range_search = TextRange::from_to(start, offset);
-                                let mut commas: usize = arg_list.syntax().text()
-                                    .slice(range_search).to_string()
+                                let mut commas: usize = arg_list
+                                    .syntax()
+                                    .text()
+                                    .slice(range_search)
+                                    .to_string()
                                     .matches(",")
                                     .count();
 
@@ -381,7 +417,12 @@ impl AnalysisImpl {
         self.world_symbols(query, token)
     }
 
-    fn resolve_module(&self, module_tree: &ModuleTreeDescriptor, file_id: FileId, module: ast::Module) -> Vec<FileId> {
+    fn resolve_module(
+        &self,
+        module_tree: &ModuleTreeDescriptor,
+        file_id: FileId,
+        module: ast::Module,
+    ) -> Vec<FileId> {
         let name = match module.name() {
             Some(name) => name.text(),
             None => return Vec::new(),
@@ -407,15 +448,17 @@ impl SourceChange {
             label: label.to_string(),
             source_file_edits: vec![file_edit],
             file_system_edits: vec![],
-            cursor_position: edit.cursor_position
-                .map(|offset| Position { offset, file_id })
+            cursor_position: edit
+                .cursor_position
+                .map(|offset| Position { offset, file_id }),
         }
     }
 }
 
 impl CrateGraph {
     fn crate_id_for_crate_root(&self, file_id: FileId) -> Option<CrateId> {
-        let (&crate_id, _) = self.crate_roots
+        let (&crate_id, _) = self
+            .crate_roots
             .iter()
             .find(|(_crate_id, &root_id)| root_id == file_id)?;
         Some(crate_id)
@@ -424,7 +467,7 @@ impl CrateGraph {
 
 enum FnCallNode<'a> {
     CallExpr(ast::CallExpr<'a>),
-    MethodCallExpr(ast::MethodCallExpr<'a>)
+    MethodCallExpr(ast::MethodCallExpr<'a>),
 }
 
 impl<'a> FnCallNode<'a> {
@@ -440,27 +483,23 @@ impl<'a> FnCallNode<'a> {
 
     pub fn name_ref(&self) -> Option<ast::NameRef> {
         match *self {
-            FnCallNode::CallExpr(call_expr) => {
-                Some(match call_expr.expr()? {
-                    Expr::PathExpr(path_expr) => {
-                        path_expr.path()?.segment()?.name_ref()?
-                    },
-                    _ => return None
-                })
-            },
+            FnCallNode::CallExpr(call_expr) => Some(match call_expr.expr()? {
+                Expr::PathExpr(path_expr) => path_expr.path()?.segment()?.name_ref()?,
+                _ => return None,
+            }),
 
-            FnCallNode::MethodCallExpr(call_expr) => {
-                call_expr.syntax().children()
-                    .filter_map(ast::NameRef::cast)
-                    .nth(0)
-            }
+            FnCallNode::MethodCallExpr(call_expr) => call_expr
+                .syntax()
+                .children()
+                .filter_map(ast::NameRef::cast)
+                .nth(0),
         }
     }
 
     pub fn arg_list(&self) -> Option<ast::ArgList> {
         match *self {
             FnCallNode::CallExpr(expr) => expr.arg_list(),
-            FnCallNode::MethodCallExpr(expr) => expr.arg_list()
+            FnCallNode::MethodCallExpr(expr) => expr.arg_list(),
         }
     }
 }
diff --git a/crates/ra_analysis/src/job.rs b/crates/ra_analysis/src/job.rs
index ea1652a26e6..2871f983908 100644
--- a/crates/ra_analysis/src/job.rs
+++ b/crates/ra_analysis/src/job.rs
@@ -14,15 +14,20 @@ impl JobHandle {
     pub fn new() -> (JobHandle, JobToken) {
         let (sender_alive, receiver_alive) = bounded(0);
         let (sender_canceled, receiver_canceled) = bounded(0);
-        let token = JobToken { _job_alive: sender_alive, job_canceled: receiver_canceled };
-        let handle = JobHandle { job_alive: receiver_alive, _job_canceled: sender_canceled };
+        let token = JobToken {
+            _job_alive: sender_alive,
+            job_canceled: receiver_canceled,
+        };
+        let handle = JobHandle {
+            job_alive: receiver_alive,
+            _job_canceled: sender_canceled,
+        };
         (handle, token)
     }
     pub fn has_completed(&self) -> bool {
         is_closed(&self.job_alive)
     }
-    pub fn cancel(self) {
-    }
+    pub fn cancel(self) {}
 }
 
 impl JobToken {
@@ -31,7 +36,6 @@ impl JobToken {
     }
 }
 
-
 // We don't actually send messages through the channels,
 // and instead just check if the channel is closed,
 // so we use uninhabited enum as a message type
diff --git a/crates/ra_analysis/src/lib.rs b/crates/ra_analysis/src/lib.rs
index d8b355a81aa..2eeacaabe34 100644
--- a/crates/ra_analysis/src/lib.rs
+++ b/crates/ra_analysis/src/lib.rs
@@ -1,44 +1,40 @@
 extern crate parking_lot;
 #[macro_use]
 extern crate log;
-extern crate once_cell;
-extern crate ra_syntax;
-extern crate ra_editor;
 extern crate fst;
+extern crate once_cell;
+extern crate ra_editor;
+extern crate ra_syntax;
 extern crate rayon;
 extern crate relative_path;
 #[macro_use]
 extern crate crossbeam_channel;
 extern crate im;
-extern crate salsa;
 extern crate rustc_hash;
+extern crate salsa;
 
-mod symbol_index;
-mod module_map;
-mod imp;
-mod job;
-mod roots;
 mod db;
 mod descriptors;
+mod imp;
+mod job;
+mod module_map;
+mod roots;
+mod symbol_index;
 
-use std::{
-    sync::Arc,
-    fmt::Debug,
-};
+use std::{fmt::Debug, sync::Arc};
 
+use crate::imp::{AnalysisHostImpl, AnalysisImpl, FileResolverImp};
+use ra_syntax::{AtomEdit, File, TextRange, TextUnit};
 use relative_path::{RelativePath, RelativePathBuf};
-use ra_syntax::{File, TextRange, TextUnit, AtomEdit};
 use rustc_hash::FxHashMap;
-use crate::imp::{AnalysisImpl, AnalysisHostImpl, FileResolverImp};
 
-pub use ra_editor::{
-    StructureNode, LineIndex, FileSymbol,
-    Runnable, RunnableKind, HighlightedRange, CompletionItem,
-    Fold, FoldKind
-};
 pub use crate::{
-    job::{JobToken, JobHandle},
     descriptors::FnDescriptor,
+    job::{JobHandle, JobToken},
+};
+pub use ra_editor::{
+    CompletionItem, FileSymbol, Fold, FoldKind, HighlightedRange, LineIndex, Runnable,
+    RunnableKind, StructureNode,
 };
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
@@ -59,20 +55,24 @@ pub trait FileResolver: Debug + Send + Sync + 'static {
 
 #[derive(Debug)]
 pub struct AnalysisHost {
-    imp: AnalysisHostImpl
+    imp: AnalysisHostImpl,
 }
 
 impl AnalysisHost {
     pub fn new() -> AnalysisHost {
-        AnalysisHost { imp: AnalysisHostImpl::new() }
+        AnalysisHost {
+            imp: AnalysisHostImpl::new(),
+        }
     }
     pub fn analysis(&self) -> Analysis {
-        Analysis { imp: self.imp.analysis() }
+        Analysis {
+            imp: self.imp.analysis(),
+        }
     }
     pub fn change_file(&mut self, file_id: FileId, text: Option<String>) {
         self.change_files(::std::iter::once((file_id, text)));
     }
-    pub fn change_files(&mut self, mut changes: impl Iterator<Item=(FileId, Option<String>)>) {
+    pub fn change_files(&mut self, mut changes: impl Iterator<Item = (FileId, Option<String>)>) {
         self.imp.change_files(&mut changes)
     }
     pub fn set_file_resolver(&mut self, resolver: Arc<FileResolver>) {
@@ -115,7 +115,7 @@ pub enum FileSystemEdit {
     MoveFile {
         file: FileId,
         path: RelativePathBuf,
-    }
+    },
 }
 
 #[derive(Debug)]
@@ -144,7 +144,7 @@ impl Query {
             only_types: false,
             libs: false,
             exact: false,
-            limit: usize::max_value()
+            limit: usize::max_value(),
         }
     }
     pub fn only_types(&mut self) {
@@ -163,7 +163,7 @@ impl Query {
 
 #[derive(Debug)]
 pub struct Analysis {
-    imp: AnalysisImpl
+    imp: AnalysisImpl,
 }
 
 impl Analysis {
@@ -195,7 +195,11 @@ impl Analysis {
     }
     pub fn on_eq_typed(&self, file_id: FileId, offset: TextUnit) -> Option<SourceChange> {
         let file = self.imp.file_syntax(file_id);
-        Some(SourceChange::from_local_edit(file_id, "add semicolon", ra_editor::on_eq_typed(&file, offset)?))
+        Some(SourceChange::from_local_edit(
+            file_id,
+            "add semicolon",
+            ra_editor::on_eq_typed(&file, offset)?,
+        ))
     }
     pub fn file_structure(&self, file_id: FileId) -> Vec<StructureNode> {
         let file = self.imp.file_syntax(file_id);
@@ -204,8 +208,14 @@ impl Analysis {
     pub fn symbol_search(&self, query: Query, token: &JobToken) -> Vec<(FileId, FileSymbol)> {
         self.imp.world_symbols(query, token)
     }
-    pub fn approximately_resolve_symbol(&self, file_id: FileId, offset: TextUnit, token: &JobToken) -> Vec<(FileId, FileSymbol)> {
-        self.imp.approximately_resolve_symbol(file_id, offset, token)
+    pub fn approximately_resolve_symbol(
+        &self,
+        file_id: FileId,
+        offset: TextUnit,
+        token: &JobToken,
+    ) -> Vec<(FileId, FileSymbol)> {
+        self.imp
+            .approximately_resolve_symbol(file_id, offset, token)
     }
     pub fn parent_module(&self, file_id: FileId) -> Vec<(FileId, FileSymbol)> {
         self.imp.parent_module(file_id)
@@ -239,15 +249,19 @@ impl Analysis {
         ra_editor::folding_ranges(&file)
     }
 
-    pub fn resolve_callable(&self, file_id: FileId, offset: TextUnit, token: &JobToken)
-        -> Option<(FnDescriptor, Option<usize>)> {
+    pub fn resolve_callable(
+        &self,
+        file_id: FileId,
+        offset: TextUnit,
+        token: &JobToken,
+    ) -> Option<(FnDescriptor, Option<usize>)> {
         self.imp.resolve_callable(file_id, offset, token)
     }
 }
 
 #[derive(Debug)]
 pub struct LibraryData {
-    root: roots::ReadonlySourceRoot
+    root: roots::ReadonlySourceRoot,
 }
 
 impl LibraryData {
diff --git a/crates/ra_analysis/src/module_map.rs b/crates/ra_analysis/src/module_map.rs
index c1799e3d4a8..ff0ec3cc7b2 100644
--- a/crates/ra_analysis/src/module_map.rs
+++ b/crates/ra_analysis/src/module_map.rs
@@ -1,10 +1,11 @@
-use std::sync::Arc;
 use crate::{
-    FileId,
-    db::{SyntaxDatabase},
+    db::SyntaxDatabase,
     descriptors::{ModuleDescriptor, ModuleTreeDescriptor},
+    FileId,
 };
 
+use std::sync::Arc;
+
 salsa::query_group! {
     pub(crate) trait ModulesDatabase: SyntaxDatabase {
         fn module_tree(key: ()) -> Arc<ModuleTreeDescriptor> {
@@ -16,7 +17,6 @@ salsa::query_group! {
     }
 }
 
-
 fn module_descriptor(db: &impl ModulesDatabase, file_id: FileId) -> Arc<ModuleDescriptor> {
     let file = db.file_syntax(file_id);
     Arc::new(ModuleDescriptor::new(file.ast()))
@@ -29,6 +29,9 @@ fn module_tree(db: &impl ModulesDatabase, (): ()) -> Arc<ModuleTreeDescriptor> {
         let module_descr = db.module_descriptor(file_id);
         files.push((file_id, module_descr));
     }
-    let res = ModuleTreeDescriptor::new(files.iter().map(|(file_id, descr)| (*file_id, &**descr)), &file_set.resolver);
+    let res = ModuleTreeDescriptor::new(
+        files.iter().map(|(file_id, descr)| (*file_id, &**descr)),
+        &file_set.resolver,
+    );
     Arc::new(res)
 }
diff --git a/crates/ra_analysis/src/roots.rs b/crates/ra_analysis/src/roots.rs
index 76bcecd38ed..1f2b21b272f 100644
--- a/crates/ra_analysis/src/roots.rs
+++ b/crates/ra_analysis/src/roots.rs
@@ -1,22 +1,19 @@
-use std::{
-    sync::Arc,
-    panic,
-};
+use std::{panic, sync::Arc};
 
 use once_cell::sync::OnceCell;
-use rayon::prelude::*;
-use salsa::Database;
-use rustc_hash::{FxHashMap, FxHashSet};
 use ra_editor::LineIndex;
 use ra_syntax::File;
+use rayon::prelude::*;
+use rustc_hash::{FxHashMap, FxHashSet};
+use salsa::Database;
 
 use crate::{
-    FileId,
-    imp::FileResolverImp,
-    symbol_index::SymbolIndex,
-    descriptors::{ModuleDescriptor, ModuleTreeDescriptor},
     db::{self, FilesDatabase, SyntaxDatabase},
+    descriptors::{ModuleDescriptor, ModuleTreeDescriptor},
+    imp::FileResolverImp,
     module_map::ModulesDatabase,
+    symbol_index::SymbolIndex,
+    FileId,
 };
 
 pub(crate) trait SourceRoot {
@@ -35,7 +32,7 @@ pub(crate) struct WritableSourceRoot {
 impl WritableSourceRoot {
     pub fn apply_changes(
         &mut self,
-        changes: &mut dyn Iterator<Item=(FileId, Option<String>)>,
+        changes: &mut dyn Iterator<Item = (FileId, Option<String>)>,
         file_resolver: Option<FileResolverImp>,
     ) {
         let mut changed = FxHashSet::default();
@@ -46,22 +43,22 @@ impl WritableSourceRoot {
                     removed.insert(file_id);
                 }
                 Some(text) => {
-                    self.db.query(db::FileTextQuery)
+                    self.db
+                        .query(db::FileTextQuery)
                         .set(file_id, Arc::new(text));
                     changed.insert(file_id);
                 }
             }
         }
         let file_set = self.db.file_set(());
-        let mut files: FxHashSet<FileId> = file_set
-            .files
-            .clone();
+        let mut files: FxHashSet<FileId> = file_set.files.clone();
         for file_id in removed {
             files.remove(&file_id);
         }
         files.extend(changed);
         let resolver = file_resolver.unwrap_or_else(|| file_set.resolver.clone());
-        self.db.query(db::FileSetQuery)
+        self.db
+            .query(db::FileSetQuery)
             .set((), Arc::new(db::FileSet { files, resolver }));
     }
 }
@@ -71,9 +68,7 @@ impl SourceRoot for WritableSourceRoot {
         self.db.module_tree(())
     }
     fn contains(&self, file_id: FileId) -> bool {
-        self.db.file_set(())
-            .files
-            .contains(&file_id)
+        self.db.file_set(()).files.contains(&file_id)
     }
     fn lines(&self, file_id: FileId) -> Arc<LineIndex> {
         self.db.file_lines(file_id)
@@ -83,7 +78,7 @@ impl SourceRoot for WritableSourceRoot {
     }
     fn symbols<'a>(&'a self, acc: &mut Vec<Arc<SymbolIndex>>) {
         let db = &self.db;
-        let symbols =  db.file_set(());
+        let symbols = db.file_set(());
         let symbols = symbols
             .files
             .iter()
@@ -108,12 +103,15 @@ impl FileData {
         }
     }
     fn lines(&self) -> &Arc<LineIndex> {
-        self.lines.get_or_init(|| Arc::new(LineIndex::new(&self.text)))
+        self.lines
+            .get_or_init(|| Arc::new(LineIndex::new(&self.text)))
     }
     fn syntax(&self) -> &File {
         let text = &self.text;
         let syntax = &self.syntax;
-        match panic::catch_unwind(panic::AssertUnwindSafe(|| syntax.get_or_init(|| File::parse(text)))) {
+        match panic::catch_unwind(panic::AssertUnwindSafe(|| {
+            syntax.get_or_init(|| File::parse(text))
+        })) {
             Ok(file) => file,
             Err(err) => {
                 error!("Parser paniced on:\n------\n{}\n------\n", text);
@@ -131,22 +129,23 @@ pub(crate) struct ReadonlySourceRoot {
 }
 
 impl ReadonlySourceRoot {
-    pub(crate) fn new(files: Vec<(FileId, String)>, file_resolver: FileResolverImp) -> ReadonlySourceRoot {
-        let modules = files.par_iter()
+    pub(crate) fn new(
+        files: Vec<(FileId, String)>,
+        file_resolver: FileResolverImp,
+    ) -> ReadonlySourceRoot {
+        let modules = files
+            .par_iter()
             .map(|(file_id, text)| {
                 let syntax = File::parse(text);
                 let mod_descr = ModuleDescriptor::new(syntax.ast());
                 (*file_id, syntax, mod_descr)
             })
             .collect::<Vec<_>>();
-        let module_tree = ModuleTreeDescriptor::new(
-            modules.iter().map(|it| (it.0, &it.2)),
-            &file_resolver,
-        );
+        let module_tree =
+            ModuleTreeDescriptor::new(modules.iter().map(|it| (it.0, &it.2)), &file_resolver);
 
-        let symbol_index = SymbolIndex::for_files(
-            modules.par_iter().map(|it| (it.0, it.1.clone()))
-        );
+        let symbol_index =
+            SymbolIndex::for_files(modules.par_iter().map(|it| (it.0, it.1.clone())));
         let file_map: FxHashMap<FileId, FileData> = files
             .into_iter()
             .map(|(id, text)| (id, FileData::new(text)))
diff --git a/crates/ra_analysis/src/symbol_index.rs b/crates/ra_analysis/src/symbol_index.rs
index 54672fde42d..51eef817043 100644
--- a/crates/ra_analysis/src/symbol_index.rs
+++ b/crates/ra_analysis/src/symbol_index.rs
@@ -1,15 +1,16 @@
-use std::{
-    sync::Arc,
-    hash::{Hash, Hasher},
-};
-use ra_editor::{FileSymbol, file_symbols};
+use crate::{FileId, JobToken, Query};
+use fst::{self, Streamer};
+use ra_editor::{file_symbols, FileSymbol};
 use ra_syntax::{
     File,
     SyntaxKind::{self, *},
 };
-use fst::{self, Streamer};
 use rayon::prelude::*;
-use crate::{Query, FileId, JobToken};
+
+use std::{
+    hash::{Hash, Hasher},
+    sync::Arc,
+};
 
 #[derive(Debug)]
 pub(crate) struct SymbolIndex {
@@ -23,8 +24,7 @@ impl PartialEq for SymbolIndex {
     }
 }
 
-impl Eq for SymbolIndex {
-}
+impl Eq for SymbolIndex {}
 
 impl Hash for SymbolIndex {
     fn hash<H: Hasher>(&self, hasher: &mut H) {
@@ -33,14 +33,12 @@ impl Hash for SymbolIndex {
 }
 
 impl SymbolIndex {
-    pub(crate) fn for_files(files: impl ParallelIterator<Item=(FileId, File)>) -> SymbolIndex {
+    pub(crate) fn for_files(files: impl ParallelIterator<Item = (FileId, File)>) -> SymbolIndex {
         let mut symbols = files
             .flat_map(|(file_id, file)| {
                 file_symbols(&file)
                     .into_iter()
-                    .map(move |symbol| {
-                        (symbol.name.as_str().to_lowercase(), (file_id, symbol))
-                    })
+                    .map(move |symbol| (symbol.name.as_str().to_lowercase(), (file_id, symbol)))
                     .collect::<Vec<_>>()
             })
             .collect::<Vec<_>>();
@@ -48,9 +46,7 @@ impl SymbolIndex {
         symbols.dedup_by(|s1, s2| s1.0 == s2.0);
         let (names, symbols): (Vec<String>, Vec<(FileId, FileSymbol)>) =
             symbols.into_iter().unzip();
-        let map = fst::Map::from_iter(
-            names.into_iter().zip(0u64..)
-        ).unwrap();
+        let map = fst::Map::from_iter(names.into_iter().zip(0u64..)).unwrap();
         SymbolIndex { symbols, map }
     }
 
@@ -65,7 +61,6 @@ impl Query {
         indices: &[Arc<SymbolIndex>],
         token: &JobToken,
     ) -> Vec<(FileId, FileSymbol)> {
-
         let mut op = fst::map::OpBuilder::new();
         for file_symbols in indices.iter() {
             let automaton = fst::automaton::Subsequence::new(&self.lowercased);
diff --git a/crates/ra_analysis/tests/tests.rs b/crates/ra_analysis/tests/tests.rs
index 2d3679fa92c..e0c637d65d5 100644
--- a/crates/ra_analysis/tests/tests.rs
+++ b/crates/ra_analysis/tests/tests.rs
@@ -1,32 +1,31 @@
-extern crate relative_path;
 extern crate ra_analysis;
-extern crate rustc_hash;
 extern crate ra_editor;
 extern crate ra_syntax;
+extern crate relative_path;
+extern crate rustc_hash;
 extern crate test_utils;
 
-use std::{
-    sync::Arc,
-};
+use std::sync::Arc;
 
-use rustc_hash::FxHashMap;
+use ra_analysis::{
+    Analysis, AnalysisHost, CrateGraph, CrateId, FileId, FileResolver, FnDescriptor, JobHandle,
+};
 use relative_path::{RelativePath, RelativePathBuf};
-use ra_analysis::{Analysis, AnalysisHost, FileId, FileResolver, JobHandle, CrateGraph, CrateId, FnDescriptor};
+use rustc_hash::FxHashMap;
 use test_utils::{assert_eq_dbg, extract_offset};
 
 #[derive(Debug)]
 struct FileMap(Vec<(FileId, RelativePathBuf)>);
 
 impl FileMap {
-    fn iter<'a>(&'a self) -> impl Iterator<Item=(FileId, &'a RelativePath)> + 'a {
-        self.0.iter().map(|(id, path)| (*id, path.as_relative_path()))
+    fn iter<'a>(&'a self) -> impl Iterator<Item = (FileId, &'a RelativePath)> + 'a {
+        self.0
+            .iter()
+            .map(|(id, path)| (*id, path.as_relative_path()))
     }
 
     fn path(&self, id: FileId) -> &RelativePath {
-        self.iter()
-            .find(|&(it, _)| it == id)
-            .unwrap()
-            .1
+        self.iter().find(|&(it, _)| it == id).unwrap().1
     }
 }
 
@@ -71,10 +70,7 @@ fn get_signature(text: &str) -> (FnDescriptor, Option<usize>) {
 
 #[test]
 fn test_resolve_module() {
-    let snap = analysis(&[
-        ("/lib.rs", "mod foo;"),
-        ("/foo.rs", "")
-    ]);
+    let snap = analysis(&[("/lib.rs", "mod foo;"), ("/foo.rs", "")]);
     let (_handle, token) = JobHandle::new();
     let symbols = snap.approximately_resolve_symbol(FileId(1), 4.into(), &token);
     assert_eq_dbg(
@@ -82,10 +78,7 @@ fn test_resolve_module() {
         &symbols,
     );
 
-    let snap = analysis(&[
-        ("/lib.rs", "mod foo;"),
-        ("/foo/mod.rs", "")
-    ]);
+    let snap = analysis(&[("/lib.rs", "mod foo;"), ("/foo/mod.rs", "")]);
     let symbols = snap.approximately_resolve_symbol(FileId(1), 4.into(), &token);
     assert_eq_dbg(
         r#"[(FileId(2), FileSymbol { name: "foo", node_range: [0; 0), kind: MODULE })]"#,
@@ -114,18 +107,12 @@ fn test_unresolved_module_diagnostic() {
 fn test_unresolved_module_diagnostic_no_diag_for_inline_mode() {
     let snap = analysis(&[("/lib.rs", "mod foo {}")]);
     let diagnostics = snap.diagnostics(FileId(1));
-    assert_eq_dbg(
-        r#"[]"#,
-        &diagnostics,
-    );
+    assert_eq_dbg(r#"[]"#, &diagnostics);
 }
 
 #[test]
 fn test_resolve_parent_module() {
-    let snap = analysis(&[
-        ("/lib.rs", "mod foo;"),
-        ("/foo.rs", ""),
-    ]);
+    let snap = analysis(&[("/lib.rs", "mod foo;"), ("/foo.rs", "")]);
     let symbols = snap.parent_module(FileId(2));
     assert_eq_dbg(
         r#"[(FileId(1), FileSymbol { name: "foo", node_range: [0; 8), kind: MODULE })]"#,
@@ -135,10 +122,7 @@ fn test_resolve_parent_module() {
 
 #[test]
 fn test_resolve_crate_root() {
-    let mut host = analysis_host(&[
-        ("/lib.rs", "mod foo;"),
-        ("/foo.rs", ""),
-    ]);
+    let mut host = analysis_host(&[("/lib.rs", "mod foo;"), ("/foo.rs", "")]);
     let snap = host.analysis();
     assert!(snap.crate_for(FileId(2)).is_empty());
 
@@ -152,20 +136,18 @@ fn test_resolve_crate_root() {
     host.set_crate_graph(crate_graph);
     let snap = host.analysis();
 
-    assert_eq!(
-        snap.crate_for(FileId(2)),
-        vec![CrateId(1)],
-    );
+    assert_eq!(snap.crate_for(FileId(2)), vec![CrateId(1)],);
 }
 
 #[test]
 fn test_fn_signature_two_args_first() {
     let (desc, param) = get_signature(
-r#"fn foo(x: u32, y: u32) -> u32 {x + y}
-fn bar() { foo(<|>3, ); }"#);
+        r#"fn foo(x: u32, y: u32) -> u32 {x + y}
+fn bar() { foo(<|>3, ); }"#,
+    );
 
     assert_eq!(desc.name, "foo".to_string());
-    assert_eq!(desc.params, vec!("x".to_string(),"y".to_string()));
+    assert_eq!(desc.params, vec!("x".to_string(), "y".to_string()));
     assert_eq!(desc.ret_type, Some("-> u32".into()));
     assert_eq!(param, Some(0));
 }
@@ -174,10 +156,11 @@ fn bar() { foo(<|>3, ); }"#);
 fn test_fn_signature_two_args_second() {
     let (desc, param) = get_signature(
         r#"fn foo(x: u32, y: u32) -> u32 {x + y}
-fn bar() { foo(3, <|>); }"#);
+fn bar() { foo(3, <|>); }"#,
+    );
 
     assert_eq!(desc.name, "foo".to_string());
-    assert_eq!(desc.params, vec!("x".to_string(),"y".to_string()));
+    assert_eq!(desc.params, vec!("x".to_string(), "y".to_string()));
     assert_eq!(desc.ret_type, Some("-> u32".into()));
     assert_eq!(param, Some(1));
 }
@@ -185,8 +168,9 @@ fn bar() { foo(3, <|>); }"#);
 #[test]
 fn test_fn_signature_for_impl() {
     let (desc, param) = get_signature(
-r#"struct F; impl F { pub fn new() { F{}} }
-fn bar() {let _ : F = F::new(<|>);}"#);
+        r#"struct F; impl F { pub fn new() { F{}} }
+fn bar() {let _ : F = F::new(<|>);}"#,
+    );
 
     assert_eq!(desc.name, "new".to_string());
     assert_eq!(desc.params, Vec::<String>::new());
@@ -197,7 +181,7 @@ fn bar() {let _ : F = F::new(<|>);}"#);
 #[test]
 fn test_fn_signature_for_method_self() {
     let (desc, param) = get_signature(
-r#"struct F;
+        r#"struct F;
 impl F {
     pub fn new() -> F{
         F{}
@@ -209,7 +193,8 @@ impl F {
 fn bar() {
     let f : F = F::new();
     f.do_it(<|>);
-}"#);
+}"#,
+    );
 
     assert_eq!(desc.name, "do_it".to_string());
     assert_eq!(desc.params, vec!["&self".to_string()]);
@@ -220,7 +205,7 @@ fn bar() {
 #[test]
 fn test_fn_signature_for_method_with_arg() {
     let (desc, param) = get_signature(
-r#"struct F;
+        r#"struct F;
 impl F {
     pub fn new() -> F{
         F{}
@@ -232,7 +217,8 @@ impl F {
 fn bar() {
     let f : F = F::new();
     f.do_it(<|>);
-}"#);
+}"#,
+    );
 
     assert_eq!(desc.name, "do_it".to_string());
     assert_eq!(desc.params, vec!["&self".to_string(), "x".to_string()]);
diff --git a/crates/ra_cli/src/main.rs b/crates/ra_cli/src/main.rs
index 11605cfd86c..239d846b323 100644
--- a/crates/ra_cli/src/main.rs
+++ b/crates/ra_cli/src/main.rs
@@ -2,19 +2,17 @@ extern crate clap;
 #[macro_use]
 extern crate failure;
 extern crate join_to_string;
-extern crate ra_syntax;
 extern crate ra_editor;
+extern crate ra_syntax;
 extern crate tools;
 
-use std::{
-    fs, io::Read, path::Path,
-    time::Instant
-};
+use std::{fs, io::Read, path::Path, time::Instant};
+
 use clap::{App, Arg, SubCommand};
 use join_to_string::join;
+use ra_editor::{extend_selection, file_structure, syntax_tree};
+use ra_syntax::{File, TextRange};
 use tools::collect_tests;
-use ra_syntax::{TextRange, File};
-use ra_editor::{syntax_tree, file_structure, extend_selection};
 
 type Result<T> = ::std::result::Result<T, failure::Error>;
 
@@ -36,14 +34,12 @@ fn main() -> Result<()> {
                         .takes_value(true),
                 ),
         )
-        .subcommand(
-            SubCommand::with_name("parse")
-                .arg(Arg::with_name("no-dump").long("--no-dump"))
-        )
+        .subcommand(SubCommand::with_name("parse").arg(Arg::with_name("no-dump").long("--no-dump")))
         .subcommand(SubCommand::with_name("symbols"))
-        .subcommand(SubCommand::with_name("extend-selection")
-            .arg(Arg::with_name("start"))
-            .arg(Arg::with_name("end"))
+        .subcommand(
+            SubCommand::with_name("extend-selection")
+                .arg(Arg::with_name("start"))
+                .arg(Arg::with_name("end")),
         )
         .get_matches();
     match matches.subcommand() {
@@ -116,7 +112,8 @@ fn selections(file: &File, start: u32, end: u32) -> String {
         ranges.push(r);
         cur = extend_selection(&file, r);
     }
-    let ranges = ranges.iter()
+    let ranges = ranges
+        .iter()
         .map(|r| (1 + u32::from(r.start()), 1 + u32::from(r.end())))
         .map(|(s, e)| format!("({} {})", s, e));
     join(ranges)
diff --git a/crates/ra_editor/src/code_actions.rs b/crates/ra_editor/src/code_actions.rs
index 7b0a48c81a3..cadcd27207a 100644
--- a/crates/ra_editor/src/code_actions.rs
+++ b/crates/ra_editor/src/code_actions.rs
@@ -1,17 +1,14 @@
 use join_to_string::join;
 
 use ra_syntax::{
-    File, TextUnit, TextRange, Direction,
-    ast::{self, AstNode, AttrsOwner, TypeParamsOwner, NameOwner},
+    algo::{find_covering_node, find_leaf_at_offset},
+    ast::{self, AstNode, AttrsOwner, NameOwner, TypeParamsOwner},
+    Direction, File,
     SyntaxKind::{COMMA, WHITESPACE},
-    SyntaxNodeRef,
-    algo::{
-        find_leaf_at_offset,
-        find_covering_node,
-    },
+    SyntaxNodeRef, TextRange, TextUnit,
 };
 
-use crate::{EditBuilder, Edit, find_node_at_offset};
+use crate::{find_node_at_offset, Edit, EditBuilder};
 
 #[derive(Debug)]
 pub struct LocalEdit {
@@ -52,9 +49,7 @@ pub fn add_derive<'a>(file: &'a File, offset: TextUnit) -> Option<impl FnOnce()
                 edit.insert(node_start, "#[derive()]\n".to_string());
                 node_start + TextUnit::of_str("#[derive(")
             }
-            Some(tt) => {
-                tt.syntax().range().end() - TextUnit::of_char(')')
-            }
+            Some(tt) => tt.syntax().range().end() - TextUnit::of_char(')'),
         };
         LocalEdit {
             edit: edit.finish(),
@@ -74,14 +69,19 @@ pub fn add_impl<'a>(file: &'a File, offset: TextUnit) -> Option<impl FnOnce() ->
         let mut buf = String::new();
         buf.push_str("\n\nimpl");
         if let Some(type_params) = type_params {
-            type_params.syntax().text()
-                .push_to(&mut buf);
+            type_params.syntax().text().push_to(&mut buf);
         }
         buf.push_str(" ");
         buf.push_str(name.text().as_str());
         if let Some(type_params) = type_params {
-            let lifetime_params = type_params.lifetime_params().filter_map(|it| it.lifetime()).map(|it| it.text());
-            let type_params = type_params.type_params().filter_map(|it| it.name()).map(|it| it.text());
+            let lifetime_params = type_params
+                .lifetime_params()
+                .filter_map(|it| it.lifetime())
+                .map(|it| it.text());
+            let type_params = type_params
+                .type_params()
+                .filter_map(|it| it.name())
+                .map(|it| it.text());
             join(lifetime_params.chain(type_params))
                 .surround_with("<", ">")
                 .to_buf(&mut buf);
@@ -97,10 +97,17 @@ pub fn add_impl<'a>(file: &'a File, offset: TextUnit) -> Option<impl FnOnce() ->
     })
 }
 
-pub fn introduce_variable<'a>(file: &'a File, range: TextRange) -> Option<impl FnOnce() -> LocalEdit + 'a> {
+pub fn introduce_variable<'a>(
+    file: &'a File,
+    range: TextRange,
+) -> Option<impl FnOnce() -> LocalEdit + 'a> {
     let node = find_covering_node(file.syntax(), range);
     let expr = node.ancestors().filter_map(ast::Expr::cast).next()?;
-    let anchor_stmt = expr.syntax().ancestors().filter_map(ast::Stmt::cast).next()?;
+    let anchor_stmt = expr
+        .syntax()
+        .ancestors()
+        .filter_map(ast::Stmt::cast)
+        .next()?;
     let indent = anchor_stmt.syntax().prev_sibling()?;
     if indent.kind() != WHITESPACE {
         return None;
@@ -191,7 +198,8 @@ mod tests {
             "
 fn foo() {
     foo(<|>1 + 1<|>);
-}", "
+}",
+            "
 fn foo() {
     let <|>var_name = 1 + 1;
     foo(var_name);
@@ -201,11 +209,12 @@ fn foo() {
     }
     #[test]
     fn test_intrdoduce_var_expr_stmt() {
-check_action_range(
+        check_action_range(
             "
 fn foo() {
     <|>1 + 1<|>;
-}", "
+}",
+            "
 fn foo() {
     let <|>var_name = 1 + 1;
 }",
diff --git a/crates/ra_editor/src/completion.rs b/crates/ra_editor/src/completion.rs
index b6095dca9c5..86ef46ebd94 100644
--- a/crates/ra_editor/src/completion.rs
+++ b/crates/ra_editor/src/completion.rs
@@ -1,17 +1,18 @@
 use rustc_hash::{FxHashMap, FxHashSet};
 
 use ra_syntax::{
-    File, TextUnit, AstNode, SyntaxNodeRef, SyntaxKind::*,
+    algo::visit::{visitor, visitor_ctx, Visitor, VisitorCtx},
     ast::{self, LoopBodyOwner, ModuleItemOwner},
-    algo::{
-        visit::{visitor, Visitor, visitor_ctx, VisitorCtx},
-    },
     text_utils::is_subrange,
+    AstNode, File,
+    SyntaxKind::*,
+    SyntaxNodeRef, TextUnit,
 };
 
 use crate::{
-    AtomEdit, find_node_at_offset,
+    find_node_at_offset,
     scope::{FnScopes, ModuleScope},
+    AtomEdit,
 };
 
 #[derive(Debug)]
@@ -21,7 +22,7 @@ pub struct CompletionItem {
     /// What string is used for filtering, defaults to label
     pub lookup: Option<String>,
     /// What is inserted, defaults to label
-    pub snippet: Option<String>
+    pub snippet: Option<String>,
 }
 
 pub fn scope_completion(file: &File, offset: TextUnit) -> Option<Vec<CompletionItem>> {
@@ -40,7 +41,12 @@ pub fn scope_completion(file: &File, offset: TextUnit) -> Option<Vec<CompletionI
             param_completions(name_ref.syntax(), &mut res);
         }
         let name_range = name_ref.syntax().range();
-        let top_node = name_ref.syntax().ancestors().take_while(|it| it.range() == name_range).last().unwrap();
+        let top_node = name_ref
+            .syntax()
+            .ancestors()
+            .take_while(|it| it.range() == name_range)
+            .last()
+            .unwrap();
         match top_node.parent().map(|it| it.kind()) {
             Some(ROOT) | Some(ITEM_LIST) => complete_mod_item_snippets(&mut res),
             _ => (),
@@ -68,21 +74,23 @@ fn complete_name_ref(file: &File, name_ref: ast::NameRef, acc: &mut Vec<Completi
         if let Some(items) = visitor()
             .visit::<ast::Root, _>(|it| Some(it.items()))
             .visit::<ast::Module, _>(|it| Some(it.item_list()?.items()))
-            .accept(node) {
+            .accept(node)
+        {
             if let Some(items) = items {
                 let scope = ModuleScope::new(items);
                 acc.extend(
-                    scope.entries().iter()
+                    scope
+                        .entries()
+                        .iter()
                         .filter(|entry| entry.syntax() != name_ref.syntax())
                         .map(|entry| CompletionItem {
                             label: entry.name().to_string(),
                             lookup: None,
                             snippet: None,
-                        })
+                        }),
                 );
             }
             break;
-
         } else if !visited_fn {
             if let Some(fn_def) = ast::FnDef::cast(node) {
                 visited_fn = true;
@@ -103,26 +111,34 @@ fn param_completions(ctx: SyntaxNodeRef, acc: &mut Vec<CompletionItem>) {
             .visit::<ast::ItemList, _>(process)
             .accept(node);
     }
-    params.into_iter()
+    params
+        .into_iter()
         .filter_map(|(label, (count, param))| {
             let lookup = param.pat()?.syntax().text().to_string();
-            if count < 2 { None } else { Some((label, lookup)) }
+            if count < 2 {
+                None
+            } else {
+                Some((label, lookup))
+            }
         })
         .for_each(|(label, lookup)| {
             acc.push(CompletionItem {
-                label, lookup: Some(lookup), snippet: None
+                label,
+                lookup: Some(lookup),
+                snippet: None,
             })
         });
 
-    fn process<'a, N: ast::FnDefOwner<'a>>(node: N, params: &mut FxHashMap<String, (u32, ast::Param<'a>)>) {
+    fn process<'a, N: ast::FnDefOwner<'a>>(
+        node: N,
+        params: &mut FxHashMap<String, (u32, ast::Param<'a>)>,
+    ) {
         node.functions()
             .filter_map(|it| it.param_list())
             .flat_map(|it| it.params())
             .for_each(|param| {
                 let text = param.syntax().text().to_string();
-                params.entry(text)
-                      .or_insert((0, param))
-                      .0 += 1;
+                params.entry(text).or_insert((0, param)).0 += 1;
             })
     }
 }
@@ -134,8 +150,12 @@ fn is_node<'a, N: AstNode<'a>>(node: SyntaxNodeRef<'a>) -> bool {
     }
 }
 
-
-fn complete_expr_keywords(file: &File, fn_def: ast::FnDef, name_ref: ast::NameRef, acc: &mut Vec<CompletionItem>) {
+fn complete_expr_keywords(
+    file: &File,
+    fn_def: ast::FnDef,
+    name_ref: ast::NameRef,
+    acc: &mut Vec<CompletionItem>,
+) {
     acc.push(keyword("if", "if $0 {}"));
     acc.push(keyword("match", "match $0 {}"));
     acc.push(keyword("while", "while $0 {}"));
@@ -186,9 +206,14 @@ fn complete_return(fn_def: ast::FnDef, name_ref: ast::NameRef) -> Option<Complet
     //     return None;
     // }
 
-    let is_stmt = match name_ref.syntax().ancestors().filter_map(ast::ExprStmt::cast).next() {
+    let is_stmt = match name_ref
+        .syntax()
+        .ancestors()
+        .filter_map(ast::ExprStmt::cast)
+        .next()
+    {
         None => false,
-        Some(expr_stmt) => expr_stmt.syntax().range() == name_ref.syntax().range()
+        Some(expr_stmt) => expr_stmt.syntax().range() == name_ref.syntax().range(),
     };
     let snip = match (is_stmt, fn_def.ret_type().is_some()) {
         (true, true) => "return $0;",
@@ -209,39 +234,37 @@ fn keyword(kw: &str, snip: &str) -> CompletionItem {
 
 fn complete_expr_snippets(acc: &mut Vec<CompletionItem>) {
     acc.push(CompletionItem {
-            label: "pd".to_string(),
-            lookup: None,
-            snippet: Some("eprintln!(\"$0 = {:?}\", $0);".to_string()),
-        }
-    );
+        label: "pd".to_string(),
+        lookup: None,
+        snippet: Some("eprintln!(\"$0 = {:?}\", $0);".to_string()),
+    });
     acc.push(CompletionItem {
-            label: "ppd".to_string(),
-            lookup: None,
-            snippet: Some("eprintln!(\"$0 = {:#?}\", $0);".to_string()),
-        }
-    );
+        label: "ppd".to_string(),
+        lookup: None,
+        snippet: Some("eprintln!(\"$0 = {:#?}\", $0);".to_string()),
+    });
 }
 
 fn complete_mod_item_snippets(acc: &mut Vec<CompletionItem>) {
     acc.push(CompletionItem {
-            label: "tfn".to_string(),
-            lookup: None,
-            snippet: Some("#[test]\nfn $1() {\n    $0\n}".to_string()),
-        }
-    );
+        label: "tfn".to_string(),
+        lookup: None,
+        snippet: Some("#[test]\nfn $1() {\n    $0\n}".to_string()),
+    });
 }
 
 fn complete_fn(name_ref: ast::NameRef, scopes: &FnScopes, acc: &mut Vec<CompletionItem>) {
     let mut shadowed = FxHashSet::default();
     acc.extend(
-        scopes.scope_chain(name_ref.syntax())
+        scopes
+            .scope_chain(name_ref.syntax())
             .flat_map(|scope| scopes.entries(scope).iter())
             .filter(|entry| shadowed.insert(entry.name()))
             .map(|entry| CompletionItem {
                 label: entry.name().to_string(),
                 lookup: None,
                 snippet: None,
-            })
+            }),
     );
     if scopes.self_param.is_some() {
         acc.push(CompletionItem {
@@ -281,20 +304,24 @@ mod tests {
 
     #[test]
     fn test_completion_let_scope() {
-        check_scope_completion(r"
+        check_scope_completion(
+            r"
             fn quux(x: i32) {
                 let y = 92;
                 1 + <|>;
                 let z = ();
             }
-            ", r#"[CompletionItem { label: "y", lookup: None, snippet: None },
+            ",
+            r#"[CompletionItem { label: "y", lookup: None, snippet: None },
                    CompletionItem { label: "x", lookup: None, snippet: None },
-                   CompletionItem { label: "quux", lookup: None, snippet: None }]"#);
+                   CompletionItem { label: "quux", lookup: None, snippet: None }]"#,
+        );
     }
 
     #[test]
     fn test_completion_if_let_scope() {
-        check_scope_completion(r"
+        check_scope_completion(
+            r"
             fn quux() {
                 if let Some(x) = foo() {
                     let y = 92;
@@ -304,67 +331,85 @@ mod tests {
                     1 + <|>
                 }
             }
-            ", r#"[CompletionItem { label: "b", lookup: None, snippet: None },
+            ",
+            r#"[CompletionItem { label: "b", lookup: None, snippet: None },
                    CompletionItem { label: "a", lookup: None, snippet: None },
-                   CompletionItem { label: "quux", lookup: None, snippet: None }]"#);
+                   CompletionItem { label: "quux", lookup: None, snippet: None }]"#,
+        );
     }
 
     #[test]
     fn test_completion_for_scope() {
-        check_scope_completion(r"
+        check_scope_completion(
+            r"
             fn quux() {
                 for x in &[1, 2, 3] {
                     <|>
                 }
             }
-            ", r#"[CompletionItem { label: "x", lookup: None, snippet: None },
-                   CompletionItem { label: "quux", lookup: None, snippet: None }]"#);
+            ",
+            r#"[CompletionItem { label: "x", lookup: None, snippet: None },
+                   CompletionItem { label: "quux", lookup: None, snippet: None }]"#,
+        );
     }
 
     #[test]
     fn test_completion_mod_scope() {
-        check_scope_completion(r"
+        check_scope_completion(
+            r"
             struct Foo;
             enum Baz {}
             fn quux() {
                 <|>
             }
-            ", r#"[CompletionItem { label: "Foo", lookup: None, snippet: None },
+            ",
+            r#"[CompletionItem { label: "Foo", lookup: None, snippet: None },
                    CompletionItem { label: "Baz", lookup: None, snippet: None },
-                   CompletionItem { label: "quux", lookup: None, snippet: None }]"#);
+                   CompletionItem { label: "quux", lookup: None, snippet: None }]"#,
+        );
     }
 
     #[test]
     fn test_completion_mod_scope_no_self_use() {
-        check_scope_completion(r"
+        check_scope_completion(
+            r"
             use foo<|>;
-            ", r#"[]"#);
+            ",
+            r#"[]"#,
+        );
     }
 
     #[test]
     fn test_completion_mod_scope_nested() {
-        check_scope_completion(r"
+        check_scope_completion(
+            r"
             struct Foo;
             mod m {
                 struct Bar;
                 fn quux() { <|> }
             }
-            ", r#"[CompletionItem { label: "Bar", lookup: None, snippet: None },
-                   CompletionItem { label: "quux", lookup: None, snippet: None }]"#);
+            ",
+            r#"[CompletionItem { label: "Bar", lookup: None, snippet: None },
+                   CompletionItem { label: "quux", lookup: None, snippet: None }]"#,
+        );
     }
 
     #[test]
     fn test_complete_type() {
-        check_scope_completion(r"
+        check_scope_completion(
+            r"
             struct Foo;
             fn x() -> <|>
-        ", r#"[CompletionItem { label: "Foo", lookup: None, snippet: None },
-               CompletionItem { label: "x", lookup: None, snippet: None }]"#)
+        ",
+            r#"[CompletionItem { label: "Foo", lookup: None, snippet: None },
+               CompletionItem { label: "x", lookup: None, snippet: None }]"#,
+        )
     }
 
     #[test]
     fn test_complete_shadowing() {
-        check_scope_completion(r"
+        check_scope_completion(
+            r"
             fn foo() -> {
                 let bar = 92;
                 {
@@ -372,15 +417,20 @@ mod tests {
                     <|>
                 }
             }
-        ", r#"[CompletionItem { label: "bar", lookup: None, snippet: None },
-               CompletionItem { label: "foo", lookup: None, snippet: None }]"#)
+        ",
+            r#"[CompletionItem { label: "bar", lookup: None, snippet: None },
+               CompletionItem { label: "foo", lookup: None, snippet: None }]"#,
+        )
     }
 
     #[test]
     fn test_complete_self() {
-        check_scope_completion(r"
+        check_scope_completion(
+            r"
             impl S { fn foo(&self) { <|> } }
-        ", r#"[CompletionItem { label: "self", lookup: None, snippet: None }]"#)
+        ",
+            r#"[CompletionItem { label: "self", lookup: None, snippet: None }]"#,
+        )
     }
 
     #[test]
diff --git a/crates/ra_editor/src/edit.rs b/crates/ra_editor/src/edit.rs
index 46e6873197b..c3149ec541c 100644
--- a/crates/ra_editor/src/edit.rs
+++ b/crates/ra_editor/src/edit.rs
@@ -1,8 +1,5 @@
 use crate::{TextRange, TextUnit};
-use ra_syntax::{
-    AtomEdit,
-    text_utils::contains_offset_nonstrict,
-};
+use ra_syntax::{text_utils::contains_offset_nonstrict, AtomEdit};
 
 #[derive(Debug, Clone)]
 pub struct Edit {
@@ -11,7 +8,7 @@ pub struct Edit {
 
 #[derive(Debug)]
 pub struct EditBuilder {
-    atoms: Vec<AtomEdit>
+    atoms: Vec<AtomEdit>,
 }
 
 impl EditBuilder {
@@ -36,7 +33,9 @@ impl EditBuilder {
         Edit { atoms }
     }
     pub fn invalidates_offset(&self, offset: TextUnit) -> bool {
-        self.atoms.iter().any(|atom| contains_offset_nonstrict(atom.delete, offset))
+        self.atoms
+            .iter()
+            .any(|atom| contains_offset_nonstrict(atom.delete, offset))
     }
 }
 
@@ -74,7 +73,7 @@ impl Edit {
                 break;
             }
             if offset < atom.delete.end() {
-                return None
+                return None;
             }
             res += TextUnit::of_str(&atom.insert);
             res -= atom.delete.len();
diff --git a/crates/ra_editor/src/extend_selection.rs b/crates/ra_editor/src/extend_selection.rs
index ab03a717ed4..9ee1df28108 100644
--- a/crates/ra_editor/src/extend_selection.rs
+++ b/crates/ra_editor/src/extend_selection.rs
@@ -1,7 +1,8 @@
 use ra_syntax::{
-    File, TextRange, SyntaxNodeRef, TextUnit, Direction,
+    algo::{find_covering_node, find_leaf_at_offset, LeafAtOffset},
+    Direction, File,
     SyntaxKind::*,
-    algo::{find_leaf_at_offset, LeafAtOffset, find_covering_node},
+    SyntaxNodeRef, TextRange, TextUnit,
 };
 
 pub fn extend_selection(file: &File, range: TextRange) -> Option<TextRange> {
@@ -20,11 +21,11 @@ pub(crate) fn extend(root: SyntaxNodeRef, range: TextRange) -> Option<TextRange>
             LeafAtOffset::None => return None,
             LeafAtOffset::Single(l) => {
                 if l.kind() == COMMENT {
-                    extend_single_word_in_comment(l, offset).unwrap_or_else(||l.range())
+                    extend_single_word_in_comment(l, offset).unwrap_or_else(|| l.range())
                 } else {
                     l.range()
                 }
-            },
+            }
             LeafAtOffset::Between(l, r) => pick_best(l, r).range(),
         };
         return Some(leaf_range);
@@ -66,7 +67,7 @@ fn extend_ws(root: SyntaxNodeRef, ws: SyntaxNodeRef, offset: TextUnit) -> TextRa
         if let Some(node) = ws.next_sibling() {
             let start = match ws_prefix.rfind('\n') {
                 Some(idx) => ws.range().start() + TextUnit::from((idx + 1) as u32),
-                None => node.range().start()
+                None => node.range().start(),
             };
             let end = if root.text().char_at(node.range().end()) == Some('\n') {
                 node.range().end() + TextUnit::of_char('\n')
@@ -94,10 +95,7 @@ fn extend_comments(node: SyntaxNodeRef) -> Option<TextRange> {
     let prev = adj_comments(node, Direction::Prev);
     let next = adj_comments(node, Direction::Next);
     if prev != next {
-        Some(TextRange::from_to(
-            prev.range().start(),
-            next.range().end(),
-        ))
+        Some(TextRange::from_to(prev.range().start(), next.range().end()))
     } else {
         None
     }
@@ -109,7 +107,7 @@ fn adj_comments(node: SyntaxNodeRef, dir: Direction) -> SyntaxNodeRef {
         match node.kind() {
             COMMENT => res = node,
             WHITESPACE if !node.leaf_text().unwrap().as_str().contains("\n\n") => (),
-            _ => break
+            _ => break,
         }
     }
     res
@@ -125,8 +123,7 @@ mod tests {
         let file = File::parse(&before);
         let mut range = TextRange::offset_len(cursor, 0.into());
         for &after in afters {
-            range = extend_selection(&file, range)
-                .unwrap();
+            range = extend_selection(&file, range).unwrap();
             let actual = &before[range];
             assert_eq!(after, actual);
         }
@@ -134,10 +131,7 @@ mod tests {
 
     #[test]
     fn test_extend_selection_arith() {
-        do_check(
-            r#"fn foo() { <|>1 + 1 }"#,
-            &["1", "1 + 1", "{ 1 + 1 }"],
-        );
+        do_check(r#"fn foo() { <|>1 + 1 }"#, &["1", "1 + 1", "{ 1 + 1 }"]);
     }
 
     #[test]
@@ -149,7 +143,7 @@ impl S {
 
     }
 }"#,
-            &["    fn foo() {\n\n    }\n"]
+            &["    fn foo() {\n\n    }\n"],
         );
     }
 
@@ -165,7 +159,11 @@ struct B {
     <|>
 }
             "#,
-            &["\n    \n", "{\n    \n}", "/// bla\n/// bla\nstruct B {\n    \n}"]
+            &[
+                "\n    \n",
+                "{\n    \n}",
+                "/// bla\n/// bla\nstruct B {\n    \n}",
+            ],
         )
     }
 
@@ -181,7 +179,7 @@ fn bar(){}
 
 // fn foo(){}
     "#,
-            &["// 1 + 1", "// fn foo() {\n// 1 + 1\n// }"]
+            &["// 1 + 1", "// fn foo() {\n// 1 + 1\n// }"],
         );
     }
 
@@ -191,42 +189,34 @@ fn bar(){}
             r#"
 fn main() { foo<|>+bar;}
     "#,
-            &["foo", "foo+bar"]
+            &["foo", "foo+bar"],
         );
         do_check(
             r#"
 fn main() { foo+<|>bar;}
     "#,
-            &["bar", "foo+bar"]
+            &["bar", "foo+bar"],
         );
     }
 
     #[test]
     fn test_extend_selection_prefer_lifetimes() {
-        do_check(
-            r#"fn foo<<|>'a>() {}"#,
-            &["'a", "<'a>"]
-        );
-        do_check(
-            r#"fn foo<'a<|>>() {}"#,
-            &["'a", "<'a>"]
-        );
+        do_check(r#"fn foo<<|>'a>() {}"#, &["'a", "<'a>"]);
+        do_check(r#"fn foo<'a<|>>() {}"#, &["'a", "<'a>"]);
     }
 
     #[test]
     fn test_extend_selection_select_first_word() {
+        do_check(r#"// foo bar b<|>az quxx"#, &["baz", "// foo bar baz quxx"]);
         do_check(
-            r#"// foo bar b<|>az quxx"#,
-            &["baz", "// foo bar baz quxx"]
-        );
-        do_check(r#"
+            r#"
 impl S {
     fn foo() {
         // hel<|>lo world
     }
 }
         "#,
-            &["hello", "// hello world"]
+            &["hello", "// hello world"],
         );
     }
 }
diff --git a/crates/ra_editor/src/folding_ranges.rs b/crates/ra_editor/src/folding_ranges.rs
index a1699d44940..e5bc0c4ee5c 100644
--- a/crates/ra_editor/src/folding_ranges.rs
+++ b/crates/ra_editor/src/folding_ranges.rs
@@ -1,11 +1,9 @@
 use rustc_hash::FxHashSet;
 
 use ra_syntax::{
-    ast,
-    AstNode,
-    File, TextRange, SyntaxNodeRef,
+    ast, AstNode, Direction, File,
     SyntaxKind::{self, *},
-    Direction,
+    SyntaxNodeRef, TextRange,
 };
 
 #[derive(Debug, PartialEq, Eq)]
@@ -28,7 +26,10 @@ pub fn folding_ranges(file: &File) -> Vec<Fold> {
         // Fold items that span multiple lines
         if let Some(kind) = fold_kind(node.kind()) {
             if has_newline(node) {
-                res.push(Fold { range: node.range(), kind });
+                res.push(Fold {
+                    range: node.range(),
+                    kind,
+                });
             }
         }
 
@@ -37,8 +38,12 @@ pub fn folding_ranges(file: &File) -> Vec<Fold> {
             continue;
         }
         if node.kind() == COMMENT {
-            contiguous_range_for_comment(node, &mut visited_comments)
-                .map(|range| res.push(Fold { range, kind: FoldKind::Comment }));
+            contiguous_range_for_comment(node, &mut visited_comments).map(|range| {
+                res.push(Fold {
+                    range,
+                    kind: FoldKind::Comment,
+                })
+            });
         }
     }
 
@@ -49,13 +54,11 @@ fn fold_kind(kind: SyntaxKind) -> Option<FoldKind> {
     match kind {
         COMMENT => Some(FoldKind::Comment),
         USE_ITEM => Some(FoldKind::Imports),
-        _ => None
+        _ => None,
     }
 }
 
-fn has_newline(
-    node: SyntaxNodeRef,
-) -> bool {
+fn has_newline(node: SyntaxNodeRef) -> bool {
     for descendant in node.descendants() {
         if let Some(ws) = ast::Whitespace::cast(descendant) {
             if ws.has_newlines() {
@@ -100,9 +103,7 @@ fn contiguous_range_for_comment<'a>(
             // The comment group ends because either:
             // * An element of a different kind was reached
             // * A comment of a different flavor was reached
-            _ => {
-                break
-            }
+            _ => break,
         }
     }
 
@@ -128,7 +129,11 @@ mod tests {
         let folds = folding_ranges(&file);
 
         assert_eq!(folds.len(), ranges.len());
-        for ((fold, range), fold_kind) in folds.into_iter().zip(ranges.into_iter()).zip(fold_kinds.into_iter()) {
+        for ((fold, range), fold_kind) in folds
+            .into_iter()
+            .zip(ranges.into_iter())
+            .zip(fold_kinds.into_iter())
+        {
             assert_eq!(fold.range.start(), range.start());
             assert_eq!(fold.range.end(), range.end());
             assert_eq!(&fold.kind, fold_kind);
@@ -181,5 +186,4 @@ fn main() {
         do_check(text, folds);
     }
 
-
 }
diff --git a/crates/ra_editor/src/lib.rs b/crates/ra_editor/src/lib.rs
index bd61fd1914f..417080d90bb 100644
--- a/crates/ra_editor/src/lib.rs
+++ b/crates/ra_editor/src/lib.rs
@@ -1,44 +1,41 @@
-extern crate ra_syntax;
-extern crate superslice;
 extern crate itertools;
 extern crate join_to_string;
+extern crate ra_syntax;
 extern crate rustc_hash;
+extern crate superslice;
 #[cfg(test)]
 #[macro_use]
 extern crate test_utils as _test_utils;
 
-mod extend_selection;
-mod symbols;
-mod line_index;
-mod edit;
-mod folding_ranges;
 mod code_actions;
-mod typing;
 mod completion;
+mod edit;
+mod extend_selection;
+mod folding_ranges;
+mod line_index;
 mod scope;
+mod symbols;
 #[cfg(test)]
 mod test_utils;
+mod typing;
 
-use ra_syntax::{
-    File, TextUnit, TextRange, SmolStr, SyntaxNodeRef,
-    ast::{self, AstNode, NameOwner},
-    algo::find_leaf_at_offset,
-    SyntaxKind::{self, *},
+pub use self::{
+    code_actions::{add_derive, add_impl, flip_comma, introduce_variable, LocalEdit},
+    completion::{scope_completion, CompletionItem},
+    edit::{Edit, EditBuilder},
+    extend_selection::extend_selection,
+    folding_ranges::{folding_ranges, Fold, FoldKind},
+    line_index::{LineCol, LineIndex},
+    symbols::{file_structure, file_symbols, FileSymbol, StructureNode},
+    typing::{join_lines, on_enter, on_eq_typed},
 };
 pub use ra_syntax::AtomEdit;
-pub use self::{
-    line_index::{LineIndex, LineCol},
-    extend_selection::extend_selection,
-    symbols::{StructureNode, file_structure, FileSymbol, file_symbols},
-    edit::{EditBuilder, Edit},
-    code_actions::{
-        LocalEdit,
-        flip_comma, add_derive, add_impl,
-        introduce_variable,
-    },
-    typing::{join_lines, on_eq_typed, on_enter},
-    completion::{scope_completion, CompletionItem},
-    folding_ranges::{Fold, FoldKind, folding_ranges}
+use ra_syntax::{
+    algo::find_leaf_at_offset,
+    ast::{self, AstNode, NameOwner},
+    File, SmolStr,
+    SyntaxKind::{self, *},
+    SyntaxNodeRef, TextRange, TextUnit,
 };
 
 #[derive(Debug)]
@@ -67,10 +64,7 @@ pub enum RunnableKind {
 
 pub fn matching_brace(file: &File, offset: TextUnit) -> Option<TextUnit> {
     const BRACES: &[SyntaxKind] = &[
-        L_CURLY, R_CURLY,
-        L_BRACK, R_BRACK,
-        L_PAREN, R_PAREN,
-        L_ANGLE, R_ANGLE,
+        L_CURLY, R_CURLY, L_BRACK, R_BRACK, L_PAREN, R_PAREN, L_ANGLE, R_ANGLE,
     ];
     let (brace_node, brace_idx) = find_leaf_at_offset(file.syntax(), offset)
         .filter_map(|node| {
@@ -80,7 +74,8 @@ pub fn matching_brace(file: &File, offset: TextUnit) -> Option<TextUnit> {
         .next()?;
     let parent = brace_node.parent()?;
     let matching_kind = BRACES[brace_idx ^ 1];
-    let matching_node = parent.children()
+    let matching_node = parent
+        .children()
         .find(|node| node.kind() == matching_kind)?;
     Some(matching_node.range().start())
 }
@@ -108,10 +103,13 @@ pub fn highlight(file: &File) -> Vec<HighlightedRange> {
 }
 
 pub fn diagnostics(file: &File) -> Vec<Diagnostic> {
-    file.errors().into_iter().map(|err| Diagnostic {
-        range: TextRange::offset_len(err.offset, 1.into()),
-        msg: "Syntax Error: ".to_string() + &err.msg,
-    }).collect()
+    file.errors()
+        .into_iter()
+        .map(|err| Diagnostic {
+            range: TextRange::offset_len(err.offset, 1.into()),
+            msg: "Syntax Error: ".to_string() + &err.msg,
+        })
+        .collect()
 }
 
 pub fn syntax_tree(file: &File) -> String {
@@ -119,7 +117,8 @@ pub fn syntax_tree(file: &File) -> String {
 }
 
 pub fn runnables(file: &File) -> Vec<Runnable> {
-    file.syntax().descendants()
+    file.syntax()
+        .descendants()
         .filter_map(ast::FnDef::cast)
         .filter_map(|f| {
             let name = f.name()?.text();
@@ -127,7 +126,7 @@ pub fn runnables(file: &File) -> Vec<Runnable> {
                 RunnableKind::Bin
             } else if f.has_atom_attr("test") {
                 RunnableKind::Test {
-                    name: name.to_string()
+                    name: name.to_string(),
                 }
             } else {
                 return None;
@@ -145,15 +144,18 @@ pub fn find_node_at_offset<'a, N: AstNode<'a>>(
     offset: TextUnit,
 ) -> Option<N> {
     let leaves = find_leaf_at_offset(syntax, offset);
-    let leaf = leaves.clone()
+    let leaf = leaves
+        .clone()
         .find(|leaf| !leaf.kind().is_trivia())
         .or_else(|| leaves.right_biased())?;
-    leaf.ancestors()
-        .filter_map(N::cast)
-        .next()
+    leaf.ancestors().filter_map(N::cast).next()
 }
 
-pub fn resolve_local_name(file: &File, offset: TextUnit, name_ref: ast::NameRef) -> Option<(SmolStr, TextRange)> {
+pub fn resolve_local_name(
+    file: &File,
+    offset: TextUnit,
+    name_ref: ast::NameRef,
+) -> Option<(SmolStr, TextRange)> {
     let fn_def = find_node_at_offset::<ast::FnDef>(file.syntax(), offset)?;
     let scopes = scope::FnScopes::new(fn_def);
     let scope_entry = scope::resolve_local_name(name_ref, &scopes)?;
@@ -164,15 +166,17 @@ pub fn resolve_local_name(file: &File, offset: TextUnit, name_ref: ast::NameRef)
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::test_utils::{assert_eq_dbg, extract_offset, add_cursor};
+    use crate::test_utils::{add_cursor, assert_eq_dbg, extract_offset};
 
     #[test]
     fn test_highlighting() {
-        let file = File::parse(r#"
+        let file = File::parse(
+            r#"
 // comment
 fn main() {}
     println!("Hello, {}!", 92);
-"#);
+"#,
+        );
         let hls = highlight(&file);
         assert_eq_dbg(
             r#"[HighlightedRange { range: [1; 11), tag: "comment" },
@@ -187,7 +191,8 @@ fn main() {}
 
     #[test]
     fn test_runnables() {
-      let file = File::parse(r#"
+        let file = File::parse(
+            r#"
 fn main() {}
 
 #[test]
@@ -196,7 +201,8 @@ fn test_foo() {}
 #[test]
 #[ignore]
 fn test_foo() {}
-"#);
+"#,
+        );
         let runnables = runnables(&file);
         assert_eq_dbg(
             r#"[Runnable { range: [1; 13), kind: Bin },
@@ -219,9 +225,6 @@ fn test_foo() {}
             assert_eq_text!(after, &actual);
         }
 
-        do_check(
-            "struct Foo { a: i32, }<|>",
-            "struct Foo <|>{ a: i32, }",
-        );
+        do_check("struct Foo { a: i32, }<|>", "struct Foo <|>{ a: i32, }");
     }
 }
diff --git a/crates/ra_editor/src/line_index.rs b/crates/ra_editor/src/line_index.rs
index 95d64b8a807..da0f2a7f794 100644
--- a/crates/ra_editor/src/line_index.rs
+++ b/crates/ra_editor/src/line_index.rs
@@ -1,5 +1,5 @@
-use superslice::Ext;
 use crate::TextUnit;
+use superslice::Ext;
 
 #[derive(Clone, Debug, Hash, PartialEq, Eq)]
 pub struct LineIndex {
@@ -29,7 +29,10 @@ impl LineIndex {
         let line = self.newlines.upper_bound(&offset) - 1;
         let line_start_offset = self.newlines[line];
         let col = offset - line_start_offset;
-        return LineCol { line: line as u32, col };
+        return LineCol {
+            line: line as u32,
+            col,
+        };
     }
 
     pub fn offset(&self, line_col: LineCol) -> TextUnit {
@@ -42,21 +45,105 @@ impl LineIndex {
 fn test_line_index() {
     let text = "hello\nworld";
     let index = LineIndex::new(text);
-    assert_eq!(index.line_col(0.into()), LineCol { line: 0, col: 0.into() });
-    assert_eq!(index.line_col(1.into()), LineCol { line: 0, col: 1.into() });
-    assert_eq!(index.line_col(5.into()), LineCol { line: 0, col: 5.into() });
-    assert_eq!(index.line_col(6.into()), LineCol { line: 1, col: 0.into() });
-    assert_eq!(index.line_col(7.into()), LineCol { line: 1, col: 1.into() });
-    assert_eq!(index.line_col(8.into()), LineCol { line: 1, col: 2.into() });
-    assert_eq!(index.line_col(10.into()), LineCol { line: 1, col: 4.into() });
-    assert_eq!(index.line_col(11.into()), LineCol { line: 1, col: 5.into() });
-    assert_eq!(index.line_col(12.into()), LineCol { line: 1, col: 6.into() });
+    assert_eq!(
+        index.line_col(0.into()),
+        LineCol {
+            line: 0,
+            col: 0.into()
+        }
+    );
+    assert_eq!(
+        index.line_col(1.into()),
+        LineCol {
+            line: 0,
+            col: 1.into()
+        }
+    );
+    assert_eq!(
+        index.line_col(5.into()),
+        LineCol {
+            line: 0,
+            col: 5.into()
+        }
+    );
+    assert_eq!(
+        index.line_col(6.into()),
+        LineCol {
+            line: 1,
+            col: 0.into()
+        }
+    );
+    assert_eq!(
+        index.line_col(7.into()),
+        LineCol {
+            line: 1,
+            col: 1.into()
+        }
+    );
+    assert_eq!(
+        index.line_col(8.into()),
+        LineCol {
+            line: 1,
+            col: 2.into()
+        }
+    );
+    assert_eq!(
+        index.line_col(10.into()),
+        LineCol {
+            line: 1,
+            col: 4.into()
+        }
+    );
+    assert_eq!(
+        index.line_col(11.into()),
+        LineCol {
+            line: 1,
+            col: 5.into()
+        }
+    );
+    assert_eq!(
+        index.line_col(12.into()),
+        LineCol {
+            line: 1,
+            col: 6.into()
+        }
+    );
 
     let text = "\nhello\nworld";
     let index = LineIndex::new(text);
-    assert_eq!(index.line_col(0.into()), LineCol { line: 0, col: 0.into() });
-    assert_eq!(index.line_col(1.into()), LineCol { line: 1, col: 0.into() });
-    assert_eq!(index.line_col(2.into()), LineCol { line: 1, col: 1.into() });
-    assert_eq!(index.line_col(6.into()), LineCol { line: 1, col: 5.into() });
-    assert_eq!(index.line_col(7.into()), LineCol { line: 2, col: 0.into() });
+    assert_eq!(
+        index.line_col(0.into()),
+        LineCol {
+            line: 0,
+            col: 0.into()
+        }
+    );
+    assert_eq!(
+        index.line_col(1.into()),
+        LineCol {
+            line: 1,
+            col: 0.into()
+        }
+    );
+    assert_eq!(
+        index.line_col(2.into()),
+        LineCol {
+            line: 1,
+            col: 1.into()
+        }
+    );
+    assert_eq!(
+        index.line_col(6.into()),
+        LineCol {
+            line: 1,
+            col: 5.into()
+        }
+    );
+    assert_eq!(
+        index.line_col(7.into()),
+        LineCol {
+            line: 2,
+            col: 0.into()
+        }
+    );
 }
diff --git a/crates/ra_editor/src/scope/fn_scope.rs b/crates/ra_editor/src/scope/fn_scope.rs
index 99d698b607f..9088e5a608b 100644
--- a/crates/ra_editor/src/scope/fn_scope.rs
+++ b/crates/ra_editor/src/scope/fn_scope.rs
@@ -1,10 +1,11 @@
 use std::fmt;
+
 use rustc_hash::FxHashMap;
 
 use ra_syntax::{
-    SyntaxNodeRef, SyntaxNode, SmolStr, AstNode,
-    ast::{self, NameOwner, LoopBodyOwner, ArgListOwner},
-    algo::{generate}
+    algo::generate,
+    ast::{self, ArgListOwner, LoopBodyOwner, NameOwner},
+    AstNode, SmolStr, SyntaxNode, SyntaxNodeRef,
 };
 
 type ScopeId = usize;
@@ -19,11 +20,12 @@ pub struct FnScopes {
 impl FnScopes {
     pub fn new(fn_def: ast::FnDef) -> FnScopes {
         let mut scopes = FnScopes {
-            self_param: fn_def.param_list()
+            self_param: fn_def
+                .param_list()
                 .and_then(|it| it.self_param())
                 .map(|it| it.syntax().owned()),
             scopes: Vec::new(),
-            scope_for: FxHashMap::default()
+            scope_for: FxHashMap::default(),
         };
         let root = scopes.root_scope();
         scopes.add_params_bindings(root, fn_def.param_list());
@@ -35,27 +37,38 @@ impl FnScopes {
     pub fn entries(&self, scope: ScopeId) -> &[ScopeEntry] {
         &self.scopes[scope].entries
     }
-    pub fn scope_chain<'a>(&'a self, node: SyntaxNodeRef) -> impl Iterator<Item=ScopeId> + 'a {
-        generate(self.scope_for(node), move |&scope| self.scopes[scope].parent)
+    pub fn scope_chain<'a>(&'a self, node: SyntaxNodeRef) -> impl Iterator<Item = ScopeId> + 'a {
+        generate(self.scope_for(node), move |&scope| {
+            self.scopes[scope].parent
+        })
     }
     fn root_scope(&mut self) -> ScopeId {
         let res = self.scopes.len();
-        self.scopes.push(ScopeData { parent: None, entries: vec![] });
+        self.scopes.push(ScopeData {
+            parent: None,
+            entries: vec![],
+        });
         res
     }
     fn new_scope(&mut self, parent: ScopeId) -> ScopeId {
         let res = self.scopes.len();
-        self.scopes.push(ScopeData { parent: Some(parent), entries: vec![] });
+        self.scopes.push(ScopeData {
+            parent: Some(parent),
+            entries: vec![],
+        });
         res
     }
     fn add_bindings(&mut self, scope: ScopeId, pat: ast::Pat) {
-        let entries = pat.syntax().descendants()
+        let entries = pat
+            .syntax()
+            .descendants()
             .filter_map(ast::BindPat::cast)
             .filter_map(ScopeEntry::new);
         self.scopes[scope].entries.extend(entries);
     }
     fn add_params_bindings(&mut self, scope: ScopeId, params: Option<ast::ParamList>) {
-        params.into_iter()
+        params
+            .into_iter()
             .flat_map(|it| it.params())
             .filter_map(|it| it.pat())
             .for_each(|it| self.add_bindings(scope, it));
@@ -71,34 +84,33 @@ impl FnScopes {
 }
 
 pub struct ScopeEntry {
-    syntax: SyntaxNode
+    syntax: SyntaxNode,
 }
 
 impl ScopeEntry {
     fn new(pat: ast::BindPat) -> Option<ScopeEntry> {
         if pat.name().is_some() {
-            Some(ScopeEntry { syntax: pat.syntax().owned() })
+            Some(ScopeEntry {
+                syntax: pat.syntax().owned(),
+            })
         } else {
             None
         }
     }
     pub fn name(&self) -> SmolStr {
-        self.ast().name()
-            .unwrap()
-            .text()
+        self.ast().name().unwrap().text()
     }
     pub fn ast(&self) -> ast::BindPat {
-        ast::BindPat::cast(self.syntax.borrowed())
-            .unwrap()
+        ast::BindPat::cast(self.syntax.borrowed()).unwrap()
     }
 }
 
 impl fmt::Debug for ScopeEntry {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         f.debug_struct("ScopeEntry")
-         .field("name", &self.name())
-         .field("syntax", &self.syntax)
-         .finish()
+            .field("name", &self.name())
+            .field("syntax", &self.syntax)
+            .finish()
     }
 }
 
@@ -132,16 +144,16 @@ fn compute_block_scopes(block: ast::Block, scopes: &mut FnScopes, mut scope: Sco
 fn compute_expr_scopes(expr: ast::Expr, scopes: &mut FnScopes, scope: ScopeId) {
     match expr {
         ast::Expr::IfExpr(e) => {
-            let cond_scope = e.condition().and_then(|cond| {
-                compute_cond_scopes(cond, scopes, scope)
-            });
+            let cond_scope = e
+                .condition()
+                .and_then(|cond| compute_cond_scopes(cond, scopes, scope));
             if let Some(block) = e.then_branch() {
                 compute_block_scopes(block, scopes, cond_scope.unwrap_or(scope));
             }
             if let Some(block) = e.else_branch() {
                 compute_block_scopes(block, scopes, scope);
             }
-        },
+        }
         ast::Expr::BlockExpr(e) => {
             if let Some(block) = e.block() {
                 compute_block_scopes(block, scopes, scope);
@@ -153,9 +165,9 @@ fn compute_expr_scopes(expr: ast::Expr, scopes: &mut FnScopes, scope: ScopeId) {
             }
         }
         ast::Expr::WhileExpr(e) => {
-            let cond_scope = e.condition().and_then(|cond| {
-                compute_cond_scopes(cond, scopes, scope)
-            });
+            let cond_scope = e
+                .condition()
+                .and_then(|cond| compute_cond_scopes(cond, scopes, scope));
             if let Some(block) = e.loop_body() {
                 compute_block_scopes(block, scopes, cond_scope.unwrap_or(scope));
             }
@@ -201,25 +213,31 @@ fn compute_expr_scopes(expr: ast::Expr, scopes: &mut FnScopes, scope: ScopeId) {
                 }
             }
         }
-        _ => {
-            expr.syntax().children()
-                .filter_map(ast::Expr::cast)
-                .for_each(|expr| compute_expr_scopes(expr, scopes, scope))
-        }
+        _ => expr
+            .syntax()
+            .children()
+            .filter_map(ast::Expr::cast)
+            .for_each(|expr| compute_expr_scopes(expr, scopes, scope)),
     };
 
     fn compute_call_scopes(
         receiver: Option<ast::Expr>,
         arg_list: Option<ast::ArgList>,
-        scopes: &mut FnScopes, scope: ScopeId,
+        scopes: &mut FnScopes,
+        scope: ScopeId,
     ) {
-        arg_list.into_iter()
+        arg_list
+            .into_iter()
             .flat_map(|it| it.args())
             .chain(receiver)
             .for_each(|expr| compute_expr_scopes(expr, scopes, scope));
     }
 
-    fn compute_cond_scopes(cond: ast::Condition, scopes: &mut FnScopes, scope: ScopeId) -> Option<ScopeId> {
+    fn compute_cond_scopes(
+        cond: ast::Condition,
+        scopes: &mut FnScopes,
+        scope: ScopeId,
+    ) -> Option<ScopeId> {
         if let Some(expr) = cond.expr() {
             compute_expr_scopes(expr, scopes, scope);
         }
@@ -236,14 +254,18 @@ fn compute_expr_scopes(expr: ast::Expr, scopes: &mut FnScopes, scope: ScopeId) {
 #[derive(Debug)]
 struct ScopeData {
     parent: Option<ScopeId>,
-    entries: Vec<ScopeEntry>
+    entries: Vec<ScopeEntry>,
 }
 
-pub fn resolve_local_name<'a>(name_ref: ast::NameRef, scopes: &'a FnScopes) -> Option<&'a ScopeEntry> {
+pub fn resolve_local_name<'a>(
+    name_ref: ast::NameRef,
+    scopes: &'a FnScopes,
+) -> Option<&'a ScopeEntry> {
     use rustc_hash::FxHashSet;
 
     let mut shadowed = FxHashSet::default();
-    let ret = scopes.scope_chain(name_ref.syntax())
+    let ret = scopes
+        .scope_chain(name_ref.syntax())
         .flat_map(|scope| scopes.entries(scope).iter())
         .filter(|entry| shadowed.insert(entry.name()))
         .filter(|entry| entry.name() == name_ref.text())
@@ -255,8 +277,8 @@ pub fn resolve_local_name<'a>(name_ref: ast::NameRef, scopes: &'a FnScopes) -> O
 #[cfg(test)]
 mod tests {
     use super::*;
-    use ra_syntax::File;
     use crate::{find_node_at_offset, test_utils::extract_offset};
+    use ra_syntax::File;
 
     fn do_check(code: &str, expected: &[&str]) {
         let (off, code) = extract_offset(code);
@@ -272,7 +294,8 @@ mod tests {
         let marker: ast::PathExpr = find_node_at_offset(file.syntax(), off).unwrap();
         let fn_def: ast::FnDef = find_node_at_offset(file.syntax(), off).unwrap();
         let scopes = FnScopes::new(fn_def);
-        let actual = scopes.scope_chain(marker.syntax())
+        let actual = scopes
+            .scope_chain(marker.syntax())
             .flat_map(|scope| scopes.entries(scope))
             .map(|it| it.name())
             .collect::<Vec<_>>();
@@ -281,7 +304,8 @@ mod tests {
 
     #[test]
     fn test_lambda_scope() {
-        do_check(r"
+        do_check(
+            r"
             fn quux(foo: i32) {
                 let f = |bar, baz: i32| {
                     <|>
@@ -293,7 +317,8 @@ mod tests {
 
     #[test]
     fn test_call_scope() {
-        do_check(r"
+        do_check(
+            r"
             fn quux() {
                 f(|x| <|> );
             }",
@@ -303,7 +328,8 @@ mod tests {
 
     #[test]
     fn test_metod_call_scope() {
-        do_check(r"
+        do_check(
+            r"
             fn quux() {
                 z.f(|x| <|> );
             }",
@@ -313,7 +339,8 @@ mod tests {
 
     #[test]
     fn test_loop_scope() {
-        do_check(r"
+        do_check(
+            r"
             fn quux() {
                 loop {
                     let x = ();
@@ -326,7 +353,8 @@ mod tests {
 
     #[test]
     fn test_match() {
-        do_check(r"
+        do_check(
+            r"
             fn quux() {
                 match () {
                     Some(x) => {
@@ -340,7 +368,8 @@ mod tests {
 
     #[test]
     fn test_shadow_variable() {
-        do_check(r"
+        do_check(
+            r"
             fn foo(x: String) {
                 let x : &str = &x<|>;
             }",
@@ -356,14 +385,20 @@ mod tests {
 
         let scopes = FnScopes::new(fn_def);
 
-        let local_name = resolve_local_name(name_ref, &scopes).unwrap().ast().name().unwrap();
-        let expected_name = find_node_at_offset::<ast::Name>(file.syntax(), expected_offset.into()).unwrap();
+        let local_name = resolve_local_name(name_ref, &scopes)
+            .unwrap()
+            .ast()
+            .name()
+            .unwrap();
+        let expected_name =
+            find_node_at_offset::<ast::Name>(file.syntax(), expected_offset.into()).unwrap();
         assert_eq!(local_name.syntax().range(), expected_name.syntax().range());
     }
 
     #[test]
     fn test_resolve_local_name() {
-        do_check_local_name(r#"
+        do_check_local_name(
+            r#"
             fn foo(x: i32, y: u32) {
                 {
                     let z = x * 2;
@@ -372,25 +407,30 @@ mod tests {
                     let t = x<|> * 3;
                 }
             }"#,
-            21);
+            21,
+        );
     }
 
     #[test]
     fn test_resolve_local_name_declaration() {
-        do_check_local_name(r#"
+        do_check_local_name(
+            r#"
             fn foo(x: String) {
                 let x : &str = &x<|>;
             }"#,
-            21);
+            21,
+        );
     }
 
     #[test]
     fn test_resolve_local_name_shadow() {
-        do_check_local_name(r"
+        do_check_local_name(
+            r"
         fn foo(x: String) {
             let x : &str = &x;
             x<|>
         }",
-        46);
+            46,
+        );
     }
 }
diff --git a/crates/ra_editor/src/scope/mod.rs b/crates/ra_editor/src/scope/mod.rs
index 7d6d530f787..cc2d493926c 100644
--- a/crates/ra_editor/src/scope/mod.rs
+++ b/crates/ra_editor/src/scope/mod.rs
@@ -2,7 +2,6 @@ mod fn_scope;
 mod mod_scope;
 
 pub use self::{
-    fn_scope::{FnScopes, resolve_local_name},
+    fn_scope::{resolve_local_name, FnScopes},
     mod_scope::ModuleScope,
 };
-
diff --git a/crates/ra_editor/src/scope/mod_scope.rs b/crates/ra_editor/src/scope/mod_scope.rs
index d2a3e7c5837..8d7e408f851 100644
--- a/crates/ra_editor/src/scope/mod_scope.rs
+++ b/crates/ra_editor/src/scope/mod_scope.rs
@@ -1,6 +1,6 @@
 use ra_syntax::{
-    AstNode, SyntaxNode, SyntaxNodeRef, SmolStr,
     ast::{self, AstChildren},
+    AstNode, SmolStr, SyntaxNode, SyntaxNodeRef,
 };
 
 pub struct ModuleScope {
@@ -13,7 +13,8 @@ pub struct Entry {
 }
 
 enum EntryKind {
-    Item, Import,
+    Item,
+    Import,
 }
 
 impl ModuleScope {
@@ -34,9 +35,8 @@ impl ModuleScope {
                         collect_imports(tree, &mut entries);
                     }
                     continue;
-                },
-                ast::ModuleItem::ExternCrateItem(_) |
-                ast::ModuleItem::ImplItem(_) => continue,
+                }
+                ast::ModuleItem::ExternCrateItem(_) | ast::ModuleItem::ImplItem(_) => continue,
             };
             entries.extend(entry)
         }
@@ -52,20 +52,22 @@ impl ModuleScope {
 impl Entry {
     fn new<'a>(item: impl ast::NameOwner<'a>) -> Option<Entry> {
         let name = item.name()?;
-        Some(Entry { node: name.syntax().owned(), kind: EntryKind::Item })
+        Some(Entry {
+            node: name.syntax().owned(),
+            kind: EntryKind::Item,
+        })
     }
     fn new_import(path: ast::Path) -> Option<Entry> {
         let name_ref = path.segment()?.name_ref()?;
-        Some(Entry { node: name_ref.syntax().owned(), kind: EntryKind::Import })
+        Some(Entry {
+            node: name_ref.syntax().owned(),
+            kind: EntryKind::Import,
+        })
     }
     pub fn name(&self) -> SmolStr {
         match self.kind {
-            EntryKind::Item =>
-                ast::Name::cast(self.node.borrowed()).unwrap()
-                    .text(),
-            EntryKind::Import =>
-                ast::NameRef::cast(self.node.borrowed()).unwrap()
-                    .text(),
+            EntryKind::Item => ast::Name::cast(self.node.borrowed()).unwrap().text(),
+            EntryKind::Import => ast::NameRef::cast(self.node.borrowed()).unwrap().text(),
         }
     }
     pub fn syntax(&self) -> SyntaxNodeRef {
@@ -75,32 +77,31 @@ impl Entry {
 
 fn collect_imports(tree: ast::UseTree, acc: &mut Vec<Entry>) {
     if let Some(use_tree_list) = tree.use_tree_list() {
-        return use_tree_list.use_trees().for_each(|it| collect_imports(it, acc));
+        return use_tree_list
+            .use_trees()
+            .for_each(|it| collect_imports(it, acc));
     }
     if let Some(path) = tree.path() {
         acc.extend(Entry::new_import(path));
     }
 }
 
-
 #[cfg(test)]
 mod tests {
     use super::*;
-    use ra_syntax::{File, ast::ModuleItemOwner};
+    use ra_syntax::{ast::ModuleItemOwner, File};
 
     fn do_check(code: &str, expected: &[&str]) {
         let file = File::parse(&code);
         let scope = ModuleScope::new(file.ast().items());
-        let actual = scope.entries
-            .iter()
-            .map(|it| it.name())
-            .collect::<Vec<_>>();
+        let actual = scope.entries.iter().map(|it| it.name()).collect::<Vec<_>>();
         assert_eq!(expected, actual.as_slice());
     }
 
     #[test]
     fn test_module_scope() {
-        do_check("
+        do_check(
+            "
             struct Foo;
             enum Bar {}
             mod baz {}
@@ -110,6 +111,8 @@ mod tests {
                 t,
             };
             type T = ();
-        ", &["Foo", "Bar", "baz", "quux", "z", "t", "T"])
+        ",
+            &["Foo", "Bar", "baz", "quux", "z", "t", "T"],
+        )
     }
 }
diff --git a/crates/ra_editor/src/symbols.rs b/crates/ra_editor/src/symbols.rs
index d9e4b2df7a4..b768b34bc59 100644
--- a/crates/ra_editor/src/symbols.rs
+++ b/crates/ra_editor/src/symbols.rs
@@ -1,12 +1,13 @@
+use crate::TextRange;
+
 use ra_syntax::{
-    SyntaxKind, SyntaxNodeRef, AstNode, File, SmolStr,
-    ast::{self, NameOwner},
     algo::{
         visit::{visitor, Visitor},
         walk::{walk, WalkEvent},
     },
+    ast::{self, NameOwner},
+    AstNode, File, SmolStr, SyntaxKind, SyntaxNodeRef,
 };
-use crate::TextRange;
 
 #[derive(Debug, Clone)]
 pub struct StructureNode {
@@ -25,9 +26,7 @@ pub struct FileSymbol {
 }
 
 pub fn file_symbols(file: &File) -> Vec<FileSymbol> {
-    file.syntax().descendants()
-        .filter_map(to_symbol)
-        .collect()
+    file.syntax().descendants().filter_map(to_symbol).collect()
 }
 
 fn to_symbol(node: SyntaxNodeRef) -> Option<FileSymbol> {
@@ -51,23 +50,20 @@ fn to_symbol(node: SyntaxNodeRef) -> Option<FileSymbol> {
         .accept(node)?
 }
 
-
 pub fn file_structure(file: &File) -> Vec<StructureNode> {
     let mut res = Vec::new();
     let mut stack = Vec::new();
 
     for event in walk(file.syntax()) {
         match event {
-            WalkEvent::Enter(node) => {
-                match structure_node(node) {
-                    Some(mut symbol) => {
-                        symbol.parent = stack.last().map(|&n| n);
-                        stack.push(res.len());
-                        res.push(symbol);
-                    }
-                    None => (),
+            WalkEvent::Enter(node) => match structure_node(node) {
+                Some(mut symbol) => {
+                    symbol.parent = stack.last().map(|&n| n);
+                    stack.push(res.len());
+                    res.push(symbol);
                 }
-            }
+                None => (),
+            },
             WalkEvent::Exit(node) => {
                 if structure_node(node).is_some() {
                     stack.pop().unwrap();
@@ -131,7 +127,8 @@ mod tests {
 
     #[test]
     fn test_file_structure() {
-        let file = File::parse(r#"
+        let file = File::parse(
+            r#"
 struct Foo {
     x: i32
 }
@@ -148,7 +145,8 @@ const C: i32 = 92;
 impl E {}
 
 impl fmt::Debug for E {}
-"#);
+"#,
+        );
         let symbols = file_structure(&file);
         assert_eq_dbg(
             r#"[StructureNode { parent: None, label: "Foo", navigation_range: [8; 11), node_range: [1; 26), kind: STRUCT_DEF },
diff --git a/crates/ra_editor/src/test_utils.rs b/crates/ra_editor/src/test_utils.rs
index 49eb530d50b..bc3d700f64d 100644
--- a/crates/ra_editor/src/test_utils.rs
+++ b/crates/ra_editor/src/test_utils.rs
@@ -1,12 +1,8 @@
-use ra_syntax::{File, TextUnit, TextRange};
-pub use crate::_test_utils::*;
 use crate::LocalEdit;
+pub use crate::_test_utils::*;
+use ra_syntax::{File, TextRange, TextUnit};
 
-pub fn check_action<F: Fn(&File, TextUnit) -> Option<LocalEdit>> (
-    before: &str,
-    after: &str,
-    f: F,
-) {
+pub fn check_action<F: Fn(&File, TextUnit) -> Option<LocalEdit>>(before: &str, after: &str, f: F) {
     let (before_cursor_pos, before) = extract_offset(before);
     let file = File::parse(&before);
     let result = f(&file, before_cursor_pos).expect("code action is not applicable");
@@ -19,7 +15,7 @@ pub fn check_action<F: Fn(&File, TextUnit) -> Option<LocalEdit>> (
     assert_eq_text!(after, &actual);
 }
 
-pub fn check_action_range<F: Fn(&File, TextRange) -> Option<LocalEdit>> (
+pub fn check_action_range<F: Fn(&File, TextRange) -> Option<LocalEdit>>(
     before: &str,
     after: &str,
     f: F,
diff --git a/crates/ra_editor/src/typing.rs b/crates/ra_editor/src/typing.rs
index 542b9e10bd9..50b52e7a127 100644
--- a/crates/ra_editor/src/typing.rs
+++ b/crates/ra_editor/src/typing.rs
@@ -1,32 +1,30 @@
 use std::mem;
 
 use ra_syntax::{
-    TextUnit, TextRange, SyntaxNodeRef, File, AstNode, SyntaxKind,
+    algo::{find_covering_node, find_leaf_at_offset, LeafAtOffset},
     ast,
-    algo::{
-        find_covering_node, find_leaf_at_offset, LeafAtOffset,
-    },
-    text_utils::{intersect, contains_offset_nonstrict},
+    text_utils::{contains_offset_nonstrict, intersect},
+    AstNode, File, SyntaxKind,
     SyntaxKind::*,
+    SyntaxNodeRef, TextRange, TextUnit,
 };
 
-use crate::{LocalEdit, EditBuilder, find_node_at_offset};
+use crate::{find_node_at_offset, EditBuilder, LocalEdit};
 
 pub fn join_lines(file: &File, range: TextRange) -> LocalEdit {
     let range = if range.is_empty() {
         let syntax = file.syntax();
         let text = syntax.text().slice(range.start()..);
         let pos = match text.find('\n') {
-            None => return LocalEdit {
-                edit: EditBuilder::new().finish(),
-                cursor_position: None
-            },
-            Some(pos) => pos
+            None => {
+                return LocalEdit {
+                    edit: EditBuilder::new().finish(),
+                    cursor_position: None,
+                }
+            }
+            Some(pos) => pos,
         };
-        TextRange::offset_len(
-            range.start() + pos,
-            TextUnit::of_char('\n'),
-        )
+        TextRange::offset_len(range.start() + pos, TextUnit::of_char('\n'))
     } else {
         range
     };
@@ -58,7 +56,9 @@ pub fn join_lines(file: &File, range: TextRange) -> LocalEdit {
 }
 
 pub fn on_enter(file: &File, offset: TextUnit) -> Option<LocalEdit> {
-    let comment = find_leaf_at_offset(file.syntax(), offset).left_biased().and_then(|it| ast::Comment::cast(it))?;
+    let comment = find_leaf_at_offset(file.syntax(), offset)
+        .left_biased()
+        .and_then(|it| ast::Comment::cast(it))?;
 
     if let ast::CommentFlavor::Multiline = comment.flavor() {
         return None;
@@ -88,7 +88,7 @@ fn node_indent<'a>(file: &'a File, node: SyntaxNodeRef) -> Option<&'a str> {
         }
         LeafAtOffset::Single(n) => {
             assert!(n == node);
-            return Some("")
+            return Some("");
         }
         LeafAtOffset::None => unreachable!(),
     };
@@ -110,7 +110,12 @@ pub fn on_eq_typed(file: &File, offset: TextUnit) -> Option<LocalEdit> {
         if contains_offset_nonstrict(expr_range, offset) && offset != expr_range.start() {
             return None;
         }
-        if file.syntax().text().slice(offset..expr_range.start()).contains('\n') {
+        if file
+            .syntax()
+            .text()
+            .slice(offset..expr_range.start())
+            .contains('\n')
+        {
             return None;
         }
     } else {
@@ -125,12 +130,7 @@ pub fn on_eq_typed(file: &File, offset: TextUnit) -> Option<LocalEdit> {
     })
 }
 
-fn remove_newline(
-    edit: &mut EditBuilder,
-    node: SyntaxNodeRef,
-    node_text: &str,
-    offset: TextUnit,
-) {
+fn remove_newline(edit: &mut EditBuilder, node: SyntaxNodeRef, node_text: &str, offset: TextUnit) {
     if node.kind() != WHITESPACE || node_text.bytes().filter(|&b| b == b'\n').count() != 1 {
         // The node is either the first or the last in the file
         let suff = &node_text[TextRange::from_to(
@@ -156,7 +156,7 @@ fn remove_newline(
     //
     // into `my_function(<some-expr>)`
     if join_single_expr_block(edit, node).is_some() {
-        return
+        return;
     }
 
     // The node is between two other nodes
@@ -170,34 +170,28 @@ fn remove_newline(
         // Adds: a single whitespace
         edit.replace(
             TextRange::from_to(prev.range().start(), node.range().end()),
-            " ".to_string()
+            " ".to_string(),
         );
     } else if let (Some(_), Some(next)) = (ast::Comment::cast(prev), ast::Comment::cast(next)) {
         // Removes: newline (incl. surrounding whitespace), start of the next comment
         edit.delete(TextRange::from_to(
             node.range().start(),
-            next.syntax().range().start() + TextUnit::of_str(next.prefix())
+            next.syntax().range().start() + TextUnit::of_str(next.prefix()),
         ));
     } else {
         // Remove newline but add a computed amount of whitespace characters
-        edit.replace(
-            node.range(),
-            compute_ws(prev, next).to_string(),
-        );
+        edit.replace(node.range(), compute_ws(prev, next).to_string());
     }
 }
 
 fn is_trailing_comma(left: SyntaxKind, right: SyntaxKind) -> bool {
     match (left, right) {
-       (COMMA, R_PAREN) | (COMMA, R_BRACK) => true,
-       _ => false
+        (COMMA, R_PAREN) | (COMMA, R_BRACK) => true,
+        _ => false,
     }
 }
 
-fn join_single_expr_block(
-    edit: &mut EditBuilder,
-    node: SyntaxNodeRef,
-) -> Option<()> {
+fn join_single_expr_block(edit: &mut EditBuilder, node: SyntaxNodeRef) -> Option<()> {
     let block = ast::Block::cast(node.parent()?)?;
     let block_expr = ast::BlockExpr::cast(block.syntax().parent()?)?;
     let expr = single_expr(block)?;
@@ -244,7 +238,7 @@ fn compute_ws(left: SyntaxNodeRef, right: SyntaxNodeRef) -> &'static str {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::test_utils::{check_action, extract_range, extract_offset, add_cursor};
+    use crate::test_utils::{add_cursor, check_action, extract_offset, extract_range};
 
     fn check_join_lines(before: &str, after: &str) {
         check_action(before, after, |file, offset| {
@@ -256,118 +250,142 @@ mod tests {
 
     #[test]
     fn test_join_lines_comma() {
-        check_join_lines(r"
+        check_join_lines(
+            r"
 fn foo() {
     <|>foo(1,
     )
 }
-", r"
+",
+            r"
 fn foo() {
     <|>foo(1)
 }
-");
+",
+        );
     }
 
     #[test]
     fn test_join_lines_lambda_block() {
-        check_join_lines(r"
+        check_join_lines(
+            r"
 pub fn reparse(&self, edit: &AtomEdit) -> File {
     <|>self.incremental_reparse(edit).unwrap_or_else(|| {
         self.full_reparse(edit)
     })
 }
-", r"
+",
+            r"
 pub fn reparse(&self, edit: &AtomEdit) -> File {
     <|>self.incremental_reparse(edit).unwrap_or_else(|| self.full_reparse(edit))
 }
-");
+",
+        );
     }
 
     #[test]
     fn test_join_lines_block() {
-        check_join_lines(r"
+        check_join_lines(
+            r"
 fn foo() {
     foo(<|>{
         92
     })
-}", r"
+}",
+            r"
 fn foo() {
     foo(<|>92)
-}");
+}",
+        );
     }
 
     #[test]
     fn test_join_lines_normal_comments() {
-        check_join_lines(r"
+        check_join_lines(
+            r"
 fn foo() {
     // Hello<|>
     // world!
 }
-", r"
+",
+            r"
 fn foo() {
     // Hello<|> world!
 }
-");
+",
+        );
     }
 
     #[test]
     fn test_join_lines_doc_comments() {
-        check_join_lines(r"
+        check_join_lines(
+            r"
 fn foo() {
     /// Hello<|>
     /// world!
 }
-", r"
+",
+            r"
 fn foo() {
     /// Hello<|> world!
 }
-");
+",
+        );
     }
 
     #[test]
     fn test_join_lines_mod_comments() {
-        check_join_lines(r"
+        check_join_lines(
+            r"
 fn foo() {
     //! Hello<|>
     //! world!
 }
-", r"
+",
+            r"
 fn foo() {
     //! Hello<|> world!
 }
-");
+",
+        );
     }
 
     #[test]
     fn test_join_lines_multiline_comments_1() {
-        check_join_lines(r"
+        check_join_lines(
+            r"
 fn foo() {
     // Hello<|>
     /* world! */
 }
-", r"
+",
+            r"
 fn foo() {
     // Hello<|> world! */
 }
-");
+",
+        );
     }
 
     #[test]
     fn test_join_lines_multiline_comments_2() {
-        check_join_lines(r"
+        check_join_lines(
+            r"
 fn foo() {
     // The<|>
     /* quick
     brown
     fox! */
 }
-", r"
+",
+            r"
 fn foo() {
     // The<|> quick
     brown
     fox! */
 }
-");
+",
+        );
     }
 
     fn check_join_lines_sel(before: &str, after: &str) {
@@ -380,59 +398,71 @@ fn foo() {
 
     #[test]
     fn test_join_lines_selection_fn_args() {
-        check_join_lines_sel(r"
+        check_join_lines_sel(
+            r"
 fn foo() {
     <|>foo(1,
         2,
         3,
     <|>)
 }
-    ", r"
+    ",
+            r"
 fn foo() {
     foo(1, 2, 3)
 }
-    ");
+    ",
+        );
     }
 
     #[test]
     fn test_join_lines_selection_struct() {
-        check_join_lines_sel(r"
+        check_join_lines_sel(
+            r"
 struct Foo <|>{
     f: u32,
 }<|>
-    ", r"
+    ",
+            r"
 struct Foo { f: u32 }
-    ");
+    ",
+        );
     }
 
     #[test]
     fn test_join_lines_selection_dot_chain() {
-        check_join_lines_sel(r"
+        check_join_lines_sel(
+            r"
 fn foo() {
     join(<|>type_params.type_params()
             .filter_map(|it| it.name())
             .map(|it| it.text())<|>)
-}", r"
+}",
+            r"
 fn foo() {
     join(type_params.type_params().filter_map(|it| it.name()).map(|it| it.text()))
-}");
+}",
+        );
     }
 
     #[test]
     fn test_join_lines_selection_lambda_block_body() {
-        check_join_lines_sel(r"
+        check_join_lines_sel(
+            r"
 pub fn handle_find_matching_brace() {
     params.offsets
         .map(|offset| <|>{
             world.analysis().matching_brace(&file, offset).unwrap_or(offset)
         }<|>)
         .collect();
-}", r"
+}",
+            r"
 pub fn handle_find_matching_brace() {
     params.offsets
         .map(|offset| world.analysis().matching_brace(&file, offset).unwrap_or(offset))
         .collect();
-}");
+}",
+        );
     }
 
     #[test]
@@ -454,15 +484,18 @@ pub fn handle_find_matching_brace() {
         //     let foo =;
         // }
         // ");
-        do_check(r"
+        do_check(
+            r"
 fn foo() {
     let foo =<|> 1 + 1
 }
-", r"
+",
+            r"
 fn foo() {
     let foo = 1 + 1;
 }
-");
+",
+        );
         //     do_check(r"
         // fn foo() {
         //     let foo =<|>
@@ -496,28 +529,34 @@ fn foo() {
             assert!(apply_on_enter(text).is_none())
         }
 
-        do_check(r"
+        do_check(
+            r"
 /// Some docs<|>
 fn foo() {
 }
-", r"
+",
+            r"
 /// Some docs
 /// <|>
 fn foo() {
 }
-");
-        do_check(r"
+",
+        );
+        do_check(
+            r"
 impl S {
     /// Some<|> docs.
     fn foo() {}
 }
-", r"
+",
+            r"
 impl S {
     /// Some
     /// <|> docs.
     fn foo() {}
 }
-");
+",
+        );
         do_check_noop(r"<|>//! docz");
     }
 }
diff --git a/crates/ra_lsp_server/src/caps.rs b/crates/ra_lsp_server/src/caps.rs
index 5598ec75f96..1dd4957911d 100644
--- a/crates/ra_lsp_server/src/caps.rs
+++ b/crates/ra_lsp_server/src/caps.rs
@@ -1,14 +1,8 @@
 use languageserver_types::{
-    ServerCapabilities,
-    CodeActionProviderCapability,
-    FoldingRangeProviderCapability,
-    TextDocumentSyncCapability,
+    CodeActionProviderCapability, CompletionOptions, DocumentOnTypeFormattingOptions,
+    ExecuteCommandOptions, FoldingRangeProviderCapability, ServerCapabilities,
+    SignatureHelpOptions, TextDocumentSyncCapability, TextDocumentSyncKind,
     TextDocumentSyncOptions,
-    TextDocumentSyncKind,
-    ExecuteCommandOptions,
-    CompletionOptions,
-    SignatureHelpOptions,
-    DocumentOnTypeFormattingOptions,
 };
 
 pub fn server_capabilities() -> ServerCapabilities {
@@ -20,7 +14,7 @@ pub fn server_capabilities() -> ServerCapabilities {
                 will_save: None,
                 will_save_wait_until: None,
                 save: None,
-            }
+            },
         )),
         hover_provider: None,
         completion_provider: Some(CompletionOptions {
@@ -28,7 +22,7 @@ pub fn server_capabilities() -> ServerCapabilities {
             trigger_characters: None,
         }),
         signature_help_provider: Some(SignatureHelpOptions {
-            trigger_characters: Some(vec!["(".to_string(), ",".to_string()])
+            trigger_characters: Some(vec!["(".to_string(), ",".to_string()]),
         }),
         definition_provider: Some(true),
         type_definition_provider: None,
diff --git a/crates/ra_lsp_server/src/conv.rs b/crates/ra_lsp_server/src/conv.rs
index a75b160c539..8325e8c1e24 100644
--- a/crates/ra_lsp_server/src/conv.rs
+++ b/crates/ra_lsp_server/src/conv.rs
@@ -1,17 +1,12 @@
 use languageserver_types::{
-    Range, SymbolKind, Position, TextEdit, Location, Url,
-    TextDocumentIdentifier, VersionedTextDocumentIdentifier, TextDocumentItem,
-    TextDocumentPositionParams, TextDocumentEdit,
+    Location, Position, Range, SymbolKind, TextDocumentEdit, TextDocumentIdentifier,
+    TextDocumentItem, TextDocumentPositionParams, TextEdit, Url, VersionedTextDocumentIdentifier,
 };
-use ra_editor::{LineIndex, LineCol, Edit, AtomEdit};
-use ra_syntax::{SyntaxKind, TextUnit, TextRange};
-use ra_analysis::{FileId, SourceChange, SourceFileEdit, FileSystemEdit};
+use ra_analysis::{FileId, FileSystemEdit, SourceChange, SourceFileEdit};
+use ra_editor::{AtomEdit, Edit, LineCol, LineIndex};
+use ra_syntax::{SyntaxKind, TextRange, TextUnit};
 
-use crate::{
-    Result,
-    server_world::ServerWorld,
-    req,
-};
+use crate::{req, server_world::ServerWorld, Result};
 
 pub trait Conv {
     type Output;
@@ -190,8 +185,12 @@ impl TryConvWith for SourceChange {
             None => None,
             Some(pos) => {
                 let line_index = world.analysis().file_line_index(pos.file_id);
-                let edits = self.source_file_edits.iter().find(|it| it.file_id == pos.file_id)
-                    .map(|it| it.edits.as_slice()).unwrap_or(&[]);
+                let edits = self
+                    .source_file_edits
+                    .iter()
+                    .find(|it| it.file_id == pos.file_id)
+                    .map(|it| it.edits.as_slice())
+                    .unwrap_or(&[]);
                 let line_col = translate_offset_with_edit(&*line_index, pos.offset, edits);
                 let position = Position::new(line_col.line as u64, u32::from(line_col.col) as u64);
                 Some(TextDocumentPositionParams {
@@ -224,11 +223,11 @@ fn translate_offset_with_edit(
     let fallback = pre_edit_index.line_col(offset);
     let edit = match edits.first() {
         None => return fallback,
-        Some(edit) => edit
+        Some(edit) => edit,
     };
     let end_offset = edit.delete.start() + TextUnit::of_str(&edit.insert);
     if !(edit.delete.start() <= offset && offset <= end_offset) {
-        return fallback
+        return fallback;
     }
     let rel_offset = offset - edit.delete.start();
     let in_edit_line_col = LineIndex::new(&edit.insert).line_col(rel_offset);
@@ -255,11 +254,11 @@ impl TryConvWith for SourceFileEdit {
             version: None,
         };
         let line_index = world.analysis().file_line_index(self.file_id);
-        let edits = self.edits
-            .into_iter()
-            .map_conv_with(&line_index)
-            .collect();
-        Ok(TextDocumentEdit { text_document, edits })
+        let edits = self.edits.into_iter().map_conv_with(&line_index).collect();
+        Ok(TextDocumentEdit {
+            text_document,
+            edits,
+        })
     }
 }
 
@@ -273,13 +272,13 @@ impl TryConvWith for FileSystemEdit {
                 let path = &path.as_str()[3..]; // strip `../` b/c url is weird
                 let uri = uri.join(path)?;
                 req::FileSystemEdit::CreateFile { uri }
-            },
+            }
             FileSystemEdit::MoveFile { file, path } => {
                 let src = world.file_id_to_uri(file)?;
                 let path = &path.as_str()[3..]; // strip `../` b/c url is weird
                 let dst = src.join(path)?;
                 req::FileSystemEdit::MoveFile { src, dst }
-            },
+            }
         };
         Ok(res)
     }
@@ -291,12 +290,9 @@ pub fn to_location(
     world: &ServerWorld,
     line_index: &LineIndex,
 ) -> Result<Location> {
-        let url = file_id.try_conv_with(world)?;
-        let loc = Location::new(
-            url,
-            range.conv_with(line_index),
-        );
-        Ok(loc)
+    let url = file_id.try_conv_with(world)?;
+    let loc = Location::new(url, range.conv_with(line_index));
+    Ok(loc)
 }
 
 pub trait MapConvWith<'a>: Sized + 'a {
@@ -309,8 +305,9 @@ pub trait MapConvWith<'a>: Sized + 'a {
 }
 
 impl<'a, I> MapConvWith<'a> for I
-    where I: Iterator + 'a,
-          I::Item: ConvWith
+where
+    I: Iterator + 'a,
+    I::Item: ConvWith,
 {
     type Ctx = <I::Item as ConvWith>::Ctx;
     type Output = <I::Item as ConvWith>::Output;
@@ -322,9 +319,9 @@ pub struct ConvWithIter<'a, I, Ctx: 'a> {
 }
 
 impl<'a, I, Ctx> Iterator for ConvWithIter<'a, I, Ctx>
-    where
-        I: Iterator,
-        I::Item: ConvWith<Ctx=Ctx>,
+where
+    I: Iterator,
+    I::Item: ConvWith<Ctx = Ctx>,
 {
     type Item = <I::Item as ConvWith>::Output;
 
@@ -332,4 +329,3 @@ impl<'a, I, Ctx> Iterator for ConvWithIter<'a, I, Ctx>
         self.iter.next().map(|item| item.conv_with(self.ctx))
     }
 }
-
diff --git a/crates/ra_lsp_server/src/lib.rs b/crates/ra_lsp_server/src/lib.rs
index 7224b147609..f1b17f2825d 100644
--- a/crates/ra_lsp_server/src/lib.rs
+++ b/crates/ra_lsp_server/src/lib.rs
@@ -2,39 +2,36 @@
 extern crate failure;
 #[macro_use]
 extern crate serde_derive;
+extern crate languageserver_types;
 extern crate serde;
 extern crate serde_json;
-extern crate languageserver_types;
 #[macro_use]
 extern crate crossbeam_channel;
 extern crate rayon;
 #[macro_use]
 extern crate log;
+extern crate cargo_metadata;
 extern crate drop_bomb;
-extern crate url_serde;
-extern crate walkdir;
 extern crate im;
 extern crate relative_path;
-extern crate cargo_metadata;
 extern crate rustc_hash;
+extern crate url_serde;
+extern crate walkdir;
 
 extern crate gen_lsp_server;
-extern crate ra_editor;
 extern crate ra_analysis;
+extern crate ra_editor;
 extern crate ra_syntax;
 
 mod caps;
-pub mod req;
 mod conv;
 mod main_loop;
-mod vfs;
 mod path_map;
-mod server_world;
 mod project_model;
+pub mod req;
+mod server_world;
 pub mod thread_watcher;
+mod vfs;
 
 pub type Result<T> = ::std::result::Result<T, ::failure::Error>;
-pub use crate::{
-    main_loop::main_loop,
-    caps::server_capabilities,
-};
+pub use crate::{caps::server_capabilities, main_loop::main_loop};
diff --git a/crates/ra_lsp_server/src/main.rs b/crates/ra_lsp_server/src/main.rs
index e5d1792b7e3..9f62347f129 100644
--- a/crates/ra_lsp_server/src/main.rs
+++ b/crates/ra_lsp_server/src/main.rs
@@ -6,7 +6,7 @@ extern crate flexi_logger;
 extern crate gen_lsp_server;
 extern crate ra_lsp_server;
 
-use flexi_logger::{Logger, Duplicate};
+use flexi_logger::{Duplicate, Logger};
 use gen_lsp_server::{run_server, stdio_transport};
 use ra_lsp_server::Result;
 
@@ -38,7 +38,8 @@ fn main_inner() -> Result<()> {
         receiver,
         sender,
         |params, r, s| {
-            let root = params.root_uri
+            let root = params
+                .root_uri
                 .and_then(|it| it.to_file_path().ok())
                 .unwrap_or(cwd);
             ra_lsp_server::main_loop(false, root, r, s)
@@ -49,4 +50,3 @@ fn main_inner() -> Result<()> {
     info!("... IO is down");
     Ok(())
 }
-
diff --git a/crates/ra_lsp_server/src/main_loop/handlers.rs b/crates/ra_lsp_server/src/main_loop/handlers.rs
index 5acb39b6001..c25b6385202 100644
--- a/crates/ra_lsp_server/src/main_loop/handlers.rs
+++ b/crates/ra_lsp_server/src/main_loop/handlers.rs
@@ -1,23 +1,20 @@
 use rustc_hash::FxHashMap;
 
 use languageserver_types::{
-    Diagnostic, DiagnosticSeverity, DocumentSymbol,
-    CodeActionResponse, Command, TextDocumentIdentifier,
-    SymbolInformation, Position, Location, TextEdit,
-    CompletionItem, InsertTextFormat, CompletionItemKind,
-    FoldingRange, FoldingRangeParams, FoldingRangeKind
+    CodeActionResponse, Command, CompletionItem, CompletionItemKind, Diagnostic,
+    DiagnosticSeverity, DocumentSymbol, FoldingRange, FoldingRangeKind, FoldingRangeParams,
+    InsertTextFormat, Location, Position, SymbolInformation, TextDocumentIdentifier, TextEdit,
 };
+use ra_analysis::{FileId, FoldKind, JobToken, Query, RunnableKind};
+use ra_syntax::text_utils::contains_offset_nonstrict;
 use serde_json::to_value;
-use ra_analysis::{Query, FileId, RunnableKind, JobToken, FoldKind};
-use ra_syntax::{
-    text_utils::contains_offset_nonstrict
-};
 
 use crate::{
-    req::{self, Decoration}, Result,
-    conv::{Conv, ConvWith, TryConvWith, MapConvWith, to_location},
-    server_world::ServerWorld,
+    conv::{to_location, Conv, ConvWith, MapConvWith, TryConvWith},
     project_model::TargetKind,
+    req::{self, Decoration},
+    server_world::ServerWorld,
+    Result,
 };
 
 pub fn handle_syntax_tree(
@@ -38,7 +35,9 @@ pub fn handle_extend_selection(
     let file_id = params.text_document.try_conv_with(&world)?;
     let file = world.analysis().file_syntax(file_id);
     let line_index = world.analysis().file_line_index(file_id);
-    let selections = params.selections.into_iter()
+    let selections = params
+        .selections
+        .into_iter()
         .map_conv_with(&line_index)
         .map(|r| world.analysis().extend_selection(&file, r))
         .map_conv_with(&line_index)
@@ -54,11 +53,15 @@ pub fn handle_find_matching_brace(
     let file_id = params.text_document.try_conv_with(&world)?;
     let file = world.analysis().file_syntax(file_id);
     let line_index = world.analysis().file_line_index(file_id);
-    let res = params.offsets
+    let res = params
+        .offsets
         .into_iter()
         .map_conv_with(&line_index)
         .map(|offset| {
-            world.analysis().matching_brace(&file, offset).unwrap_or(offset)
+            world
+                .analysis()
+                .matching_brace(&file, offset)
+                .unwrap_or(offset)
         })
         .map_conv_with(&line_index)
         .collect();
@@ -73,7 +76,9 @@ pub fn handle_join_lines(
     let file_id = params.text_document.try_conv_with(&world)?;
     let line_index = world.analysis().file_line_index(file_id);
     let range = params.range.conv_with(&line_index);
-    world.analysis().join_lines(file_id, range)
+    world
+        .analysis()
+        .join_lines(file_id, range)
         .try_conv_with(&world)
 }
 
@@ -87,7 +92,7 @@ pub fn handle_on_enter(
     let offset = params.position.conv_with(&line_index);
     match world.analysis().on_enter(file_id, offset) {
         None => Ok(None),
-        Some(edit) => Ok(Some(edit.try_conv_with(&world)?))
+        Some(edit) => Ok(Some(edit.try_conv_with(&world)?)),
     }
 }
 
@@ -158,7 +163,9 @@ pub fn handle_workspace_symbol(
     let all_symbols = params.query.contains("#");
     let libs = params.query.contains("*");
     let query = {
-        let query: String = params.query.chars()
+        let query: String = params
+            .query
+            .chars()
             .filter(|&c| c != '#' && c != '*')
             .collect();
         let mut q = Query::new(query);
@@ -180,22 +187,23 @@ pub fn handle_workspace_symbol(
 
     return Ok(Some(res));
 
-    fn exec_query(world: &ServerWorld, query: Query, token: &JobToken) -> Result<Vec<SymbolInformation>> {
+    fn exec_query(
+        world: &ServerWorld,
+        query: Query,
+        token: &JobToken,
+    ) -> Result<Vec<SymbolInformation>> {
         let mut res = Vec::new();
         for (file_id, symbol) in world.analysis().symbol_search(query, token) {
             let line_index = world.analysis().file_line_index(file_id);
             let info = SymbolInformation {
                 name: symbol.name.to_string(),
                 kind: symbol.kind.conv(),
-                location: to_location(
-                    file_id, symbol.node_range,
-                    world, &line_index
-                )?,
+                location: to_location(file_id, symbol.node_range, world, &line_index)?,
                 container_name: None,
                 deprecated: None,
             };
             res.push(info);
-        };
+        }
         Ok(res)
     }
 }
@@ -209,12 +217,12 @@ pub fn handle_goto_definition(
     let line_index = world.analysis().file_line_index(file_id);
     let offset = params.position.conv_with(&line_index);
     let mut res = Vec::new();
-    for (file_id, symbol) in world.analysis().approximately_resolve_symbol(file_id, offset, &token) {
+    for (file_id, symbol) in world
+        .analysis()
+        .approximately_resolve_symbol(file_id, offset, &token)
+    {
         let line_index = world.analysis().file_line_index(file_id);
-        let location = to_location(
-            file_id, symbol.node_range,
-            &world, &line_index,
-        )?;
+        let location = to_location(file_id, symbol.node_range, &world, &line_index)?;
         res.push(location)
     }
     Ok(Some(req::GotoDefinitionResponse::Array(res)))
@@ -229,10 +237,7 @@ pub fn handle_parent_module(
     let mut res = Vec::new();
     for (file_id, symbol) in world.analysis().parent_module(file_id) {
         let line_index = world.analysis().file_line_index(file_id);
-        let location = to_location(
-            file_id, symbol.node_range,
-            &world, &line_index
-        )?;
+        let location = to_location(file_id, symbol.node_range, &world, &line_index)?;
         res.push(location);
     }
     Ok(res)
@@ -259,21 +264,16 @@ pub fn handle_runnables(
         let r = req::Runnable {
             range: runnable.range.conv_with(&line_index),
             label: match &runnable.kind {
-                RunnableKind::Test { name } =>
-                    format!("test {}", name),
-                RunnableKind::Bin =>
-                    "run binary".to_string(),
+                RunnableKind::Test { name } => format!("test {}", name),
+                RunnableKind::Bin => "run binary".to_string(),
             },
             bin: "cargo".to_string(),
             args,
             env: {
                 let mut m = FxHashMap::default();
-                m.insert(
-                    "RUST_BACKTRACE".to_string(),
-                    "short".to_string(),
-                );
+                m.insert("RUST_BACKTRACE".to_string(), "short".to_string());
                 m
-            }
+            },
         };
         res.push(r);
     }
@@ -283,10 +283,16 @@ pub fn handle_runnables(
         let spec = if let Some(&crate_id) = world.analysis().crate_for(file_id).first() {
             let file_id = world.analysis().crate_root(crate_id);
             let path = world.path_map.get_path(file_id);
-            world.workspaces.iter()
+            world
+                .workspaces
+                .iter()
                 .filter_map(|ws| {
                     let tgt = ws.target_by_root(path)?;
-                    Some((tgt.package(ws).name(ws).clone(), tgt.name(ws).clone(), tgt.kind(ws)))
+                    Some((
+                        tgt.package(ws).name(ws).clone(),
+                        tgt.name(ws).clone(),
+                        tgt.kind(ws),
+                    ))
                 })
                 .next()
         } else {
@@ -294,22 +300,22 @@ pub fn handle_runnables(
         };
         let mut res = Vec::new();
         match kind {
-                RunnableKind::Test { name } => {
-                    res.push("test".to_string());
-                    if let Some((pkg_name, tgt_name, tgt_kind)) = spec {
-                        spec_args(pkg_name, tgt_name, tgt_kind, &mut res);
-                    }
-                    res.push("--".to_string());
-                    res.push(name.to_string());
-                    res.push("--nocapture".to_string());
+            RunnableKind::Test { name } => {
+                res.push("test".to_string());
+                if let Some((pkg_name, tgt_name, tgt_kind)) = spec {
+                    spec_args(pkg_name, tgt_name, tgt_kind, &mut res);
                 }
-                RunnableKind::Bin => {
-                    res.push("run".to_string());
-                    if let Some((pkg_name, tgt_name, tgt_kind)) = spec {
-                        spec_args(pkg_name, tgt_name, tgt_kind, &mut res);
-                    }
+                res.push("--".to_string());
+                res.push(name.to_string());
+                res.push("--nocapture".to_string());
+            }
+            RunnableKind::Bin => {
+                res.push("run".to_string());
+                if let Some((pkg_name, tgt_name, tgt_kind)) = spec {
+                    spec_args(pkg_name, tgt_name, tgt_kind, &mut res);
                 }
             }
+        }
         res
     }
 
@@ -362,12 +368,13 @@ pub fn handle_completion(
         None => return Ok(None),
         Some(items) => items,
     };
-    let items = items.into_iter()
+    let items = items
+        .into_iter()
         .map(|item| {
             let mut res = CompletionItem {
                 label: item.label,
                 filter_text: item.lookup,
-                .. Default::default()
+                ..Default::default()
             };
             if let Some(snip) = item.snippet {
                 res.insert_text = Some(snip);
@@ -389,24 +396,27 @@ pub fn handle_folding_range(
     let file_id = params.text_document.try_conv_with(&world)?;
     let line_index = world.analysis().file_line_index(file_id);
 
-    let res = Some(world.analysis()
-        .folding_ranges(file_id)
-        .into_iter()
-        .map(|fold| {
-            let kind = match fold.kind {
-                FoldKind::Comment => FoldingRangeKind::Comment,
-                FoldKind::Imports => FoldingRangeKind::Imports
-            };
-            let range = fold.range.conv_with(&line_index);
-            FoldingRange {
-                start_line: range.start.line,
-                start_character: Some(range.start.character),
-                end_line: range.end.line,
-                end_character: Some(range.start.character),
-                kind: Some(kind)
-            }
-        })
-        .collect());
+    let res = Some(
+        world
+            .analysis()
+            .folding_ranges(file_id)
+            .into_iter()
+            .map(|fold| {
+                let kind = match fold.kind {
+                    FoldKind::Comment => FoldingRangeKind::Comment,
+                    FoldKind::Imports => FoldingRangeKind::Imports,
+                };
+                let range = fold.range.conv_with(&line_index);
+                FoldingRange {
+                    start_line: range.start.line,
+                    start_character: Some(range.start.character),
+                    end_line: range.end.line,
+                    end_character: Some(range.start.character),
+                    kind: Some(kind),
+                }
+            })
+            .collect(),
+    );
 
     Ok(res)
 }
@@ -422,25 +432,28 @@ pub fn handle_signature_help(
     let line_index = world.analysis().file_line_index(file_id);
     let offset = params.position.conv_with(&line_index);
 
-    if let Some((descriptor, active_param)) = world.analysis().resolve_callable(file_id, offset, &token) {
-        let parameters : Vec<ParameterInformation> =
-            descriptor.params.iter().map(|param|
-                ParameterInformation {
-                    label: param.clone(),
-                    documentation: None
-                }
-            ).collect();
+    if let Some((descriptor, active_param)) =
+        world.analysis().resolve_callable(file_id, offset, &token)
+    {
+        let parameters: Vec<ParameterInformation> = descriptor
+            .params
+            .iter()
+            .map(|param| ParameterInformation {
+                label: param.clone(),
+                documentation: None,
+            })
+            .collect();
 
         let sig_info = SignatureInformation {
             label: descriptor.label,
             documentation: None,
-            parameters: Some(parameters)
+            parameters: Some(parameters),
         };
 
         Ok(Some(req::SignatureHelp {
             signatures: vec![sig_info],
             active_signature: Some(0),
-            active_parameter: active_param.map(|a| a as u64)
+            active_parameter: active_param.map(|a| a as u64),
         }))
     } else {
         Ok(None)
@@ -457,7 +470,10 @@ pub fn handle_code_action(
     let range = params.range.conv_with(&line_index);
 
     let assists = world.analysis().assists(file_id, range).into_iter();
-    let fixes = world.analysis().diagnostics(file_id).into_iter()
+    let fixes = world
+        .analysis()
+        .diagnostics(file_id)
+        .into_iter()
         .filter_map(|d| Some((d.range, d.fix?)))
         .filter(|(range, _fix)| contains_offset_nonstrict(*range, range.start()))
         .map(|(_range, fix)| fix);
@@ -483,7 +499,9 @@ pub fn publish_diagnostics(
 ) -> Result<req::PublishDiagnosticsParams> {
     let uri = world.file_id_to_uri(file_id)?;
     let line_index = world.analysis().file_line_index(file_id);
-    let diagnostics = world.analysis().diagnostics(file_id)
+    let diagnostics = world
+        .analysis()
+        .diagnostics(file_id)
         .into_iter()
         .map(|d| Diagnostic {
             range: d.range.conv_with(&line_index),
@@ -492,7 +510,8 @@ pub fn publish_diagnostics(
             source: Some("rust-analyzer".to_string()),
             message: d.message,
             related_information: None,
-        }).collect();
+        })
+        .collect();
     Ok(req::PublishDiagnosticsParams { uri, diagnostics })
 }
 
@@ -509,10 +528,13 @@ pub fn publish_decorations(
 
 fn highlight(world: &ServerWorld, file_id: FileId) -> Vec<Decoration> {
     let line_index = world.analysis().file_line_index(file_id);
-    world.analysis().highlight(file_id)
+    world
+        .analysis()
+        .highlight(file_id)
         .into_iter()
         .map(|h| Decoration {
             range: h.range.conv_with(&line_index),
             tag: h.tag,
-        }).collect()
+        })
+        .collect()
 }
diff --git a/crates/ra_lsp_server/src/main_loop/mod.rs b/crates/ra_lsp_server/src/main_loop/mod.rs
index cf2477cb519..a11baf4aaec 100644
--- a/crates/ra_lsp_server/src/main_loop/mod.rs
+++ b/crates/ra_lsp_server/src/main_loop/mod.rs
@@ -1,29 +1,26 @@
 mod handlers;
 mod subscriptions;
 
-use std::{
-    path::PathBuf,
-};
+use std::path::PathBuf;
 
-use serde::{Serialize, de::DeserializeOwned};
-use crossbeam_channel::{unbounded, Sender, Receiver};
-use rayon::{self, ThreadPool};
-use languageserver_types::{NumberOrString};
-use ra_analysis::{FileId, JobHandle, JobToken, LibraryData};
+use crossbeam_channel::{unbounded, Receiver, Sender};
 use gen_lsp_server::{
-    RawRequest, RawNotification, RawMessage, RawResponse, ErrorCode,
-    handle_shutdown,
+    handle_shutdown, ErrorCode, RawMessage, RawNotification, RawRequest, RawResponse,
 };
+use languageserver_types::NumberOrString;
+use ra_analysis::{FileId, JobHandle, JobToken, LibraryData};
+use rayon::{self, ThreadPool};
 use rustc_hash::FxHashMap;
+use serde::{de::DeserializeOwned, Serialize};
 
 use crate::{
+    main_loop::subscriptions::Subscriptions,
+    project_model::{workspace_loader, CargoWorkspace},
     req,
-    Result,
-    vfs::{self, FileEvent},
-    server_world::{ServerWorldState, ServerWorld},
-    main_loop::subscriptions::{Subscriptions},
-    project_model::{CargoWorkspace, workspace_loader},
+    server_world::{ServerWorld, ServerWorldState},
     thread_watcher::Worker,
+    vfs::{self, FileEvent},
+    Result,
 };
 
 #[derive(Debug)]
@@ -147,56 +144,50 @@ fn main_loop_inner(
                 }
                 state_changed = true;
             }
-            Event::Ws(ws) => {
-                match ws {
-                    Ok(ws) => {
-                        let workspaces = vec![ws];
-                        feedback(internal_mode, "workspace loaded", msg_sender);
-                        for ws in workspaces.iter() {
-                            for pkg in ws.packages().filter(|pkg| !pkg.is_member(ws)) {
-                                debug!("sending root, {}", pkg.root(ws).to_path_buf().display());
-                                fs_worker.send(pkg.root(ws).to_path_buf());
-                            }
+            Event::Ws(ws) => match ws {
+                Ok(ws) => {
+                    let workspaces = vec![ws];
+                    feedback(internal_mode, "workspace loaded", msg_sender);
+                    for ws in workspaces.iter() {
+                        for pkg in ws.packages().filter(|pkg| !pkg.is_member(ws)) {
+                            debug!("sending root, {}", pkg.root(ws).to_path_buf().display());
+                            fs_worker.send(pkg.root(ws).to_path_buf());
                         }
-                        state.set_workspaces(workspaces);
-                        state_changed = true;
                     }
-                    Err(e) => warn!("loading workspace failed: {}", e),
+                    state.set_workspaces(workspaces);
+                    state_changed = true;
                 }
-            }
+                Err(e) => warn!("loading workspace failed: {}", e),
+            },
             Event::Lib(lib) => {
                 feedback(internal_mode, "library loaded", msg_sender);
                 state.add_lib(lib);
             }
-            Event::Msg(msg) => {
-                match msg {
-                    RawMessage::Request(req) => {
-                        let req = match handle_shutdown(req, msg_sender) {
-                            Some(req) => req,
-                            None => return Ok(()),
-                        };
-                        match on_request(state, pending_requests, pool, &task_sender, req)? {
-                            None => (),
-                            Some(req) => {
-                                error!("unknown request: {:?}", req);
-                                let resp = RawResponse::err(
-                                    req.id,
-                                    ErrorCode::MethodNotFound as i32,
-                                    "unknown request".to_string(),
-                                );
-                                msg_sender.send(RawMessage::Response(resp))
-                            }
+            Event::Msg(msg) => match msg {
+                RawMessage::Request(req) => {
+                    let req = match handle_shutdown(req, msg_sender) {
+                        Some(req) => req,
+                        None => return Ok(()),
+                    };
+                    match on_request(state, pending_requests, pool, &task_sender, req)? {
+                        None => (),
+                        Some(req) => {
+                            error!("unknown request: {:?}", req);
+                            let resp = RawResponse::err(
+                                req.id,
+                                ErrorCode::MethodNotFound as i32,
+                                "unknown request".to_string(),
+                            );
+                            msg_sender.send(RawMessage::Response(resp))
                         }
                     }
-                    RawMessage::Notification(not) => {
-                        on_notification(msg_sender, state, pending_requests, subs, not)?;
-                        state_changed = true;
-                    }
-                    RawMessage::Response(resp) => {
-                        error!("unexpected response: {:?}", resp)
-                    }
                 }
-            }
+                RawMessage::Notification(not) => {
+                    on_notification(msg_sender, state, pending_requests, subs, not)?;
+                    state_changed = true;
+                }
+                RawMessage::Response(resp) => error!("unexpected response: {:?}", resp),
+            },
         };
 
         if state_changed {
@@ -222,8 +213,7 @@ fn on_task(
             }
             msg_sender.send(RawMessage::Response(response))
         }
-        Task::Notify(n) =>
-            msg_sender.send(RawMessage::Notification(n)),
+        Task::Notify(n) => msg_sender.send(RawMessage::Notification(n)),
     }
 }
 
@@ -237,7 +227,9 @@ fn on_request(
     let mut pool_dispatcher = PoolDispatcher {
         req: Some(req),
         res: None,
-        pool, world, sender
+        pool,
+        world,
+        sender,
     };
     let req = pool_dispatcher
         .on::<req::SyntaxTree>(handlers::handle_syntax_tree)?
@@ -262,7 +254,7 @@ fn on_request(
             let inserted = pending_requests.insert(id, handle).is_none();
             assert!(inserted, "duplicate request: {}", id);
             Ok(None)
-        },
+        }
         Err(req) => Ok(Some(req)),
     }
 }
@@ -285,45 +277,53 @@ fn on_notification(
             if let Some(handle) = pending_requests.remove(&id) {
                 handle.cancel();
             }
-            return Ok(())
+            return Ok(());
         }
         Err(not) => not,
     };
     let not = match not.cast::<req::DidOpenTextDocument>() {
         Ok(params) => {
             let uri = params.text_document.uri;
-            let path = uri.to_file_path()
+            let path = uri
+                .to_file_path()
                 .map_err(|()| format_err!("invalid uri: {}", uri))?;
             let file_id = state.add_mem_file(path, params.text_document.text);
             subs.add_sub(file_id);
-            return Ok(())
+            return Ok(());
         }
         Err(not) => not,
     };
     let not = match not.cast::<req::DidChangeTextDocument>() {
         Ok(mut params) => {
             let uri = params.text_document.uri;
-            let path = uri.to_file_path()
+            let path = uri
+                .to_file_path()
                 .map_err(|()| format_err!("invalid uri: {}", uri))?;
-            let text = params.content_changes.pop()
+            let text = params
+                .content_changes
+                .pop()
                 .ok_or_else(|| format_err!("empty changes"))?
                 .text;
             state.change_mem_file(path.as_path(), text)?;
-            return Ok(())
+            return Ok(());
         }
         Err(not) => not,
     };
     let not = match not.cast::<req::DidCloseTextDocument>() {
         Ok(params) => {
             let uri = params.text_document.uri;
-            let path = uri.to_file_path()
+            let path = uri
+                .to_file_path()
                 .map_err(|()| format_err!("invalid uri: {}", uri))?;
             let file_id = state.remove_mem_file(path.as_path())?;
             subs.remove_sub(file_id);
-            let params = req::PublishDiagnosticsParams { uri, diagnostics: Vec::new() };
+            let params = req::PublishDiagnosticsParams {
+                uri,
+                diagnostics: Vec::new(),
+            };
             let not = RawNotification::new::<req::PublishDiagnostics>(&params);
             msg_sender.send(RawMessage::Notification(not));
-            return Ok(())
+            return Ok(());
         }
         Err(not) => not,
     };
@@ -342,11 +342,12 @@ struct PoolDispatcher<'a> {
 impl<'a> PoolDispatcher<'a> {
     fn on<'b, R>(
         &'b mut self,
-        f: fn(ServerWorld, R::Params, JobToken) -> Result<R::Result>
+        f: fn(ServerWorld, R::Params, JobToken) -> Result<R::Result>,
     ) -> Result<&'b mut Self>
-    where R: req::Request,
-          R::Params: DeserializeOwned + Send + 'static,
-          R::Result: Serialize + 'static,
+    where
+        R: req::Request,
+        R::Params: DeserializeOwned + Send + 'static,
+        R::Result: Serialize + 'static,
     {
         let req = match self.req.take() {
             None => return Ok(self),
@@ -360,16 +361,16 @@ impl<'a> PoolDispatcher<'a> {
                 self.pool.spawn(move || {
                     let resp = match f(world, params, token) {
                         Ok(resp) => RawResponse::ok::<R>(id, &resp),
-                        Err(e) => RawResponse::err(id, ErrorCode::InternalError as i32, e.to_string()),
+                        Err(e) => {
+                            RawResponse::err(id, ErrorCode::InternalError as i32, e.to_string())
+                        }
                     };
                     let task = Task::Respond(resp);
                     sender.send(task);
                 });
                 self.res = Some((id, handle));
             }
-            Err(req) => {
-                self.req = Some(req)
-            }
+            Err(req) => self.req = Some(req),
         }
         Ok(self)
     }
@@ -392,18 +393,14 @@ fn update_file_notifications_on_threadpool(
     pool.spawn(move || {
         for file_id in subscriptions {
             match handlers::publish_diagnostics(&world, file_id) {
-                Err(e) => {
-                    error!("failed to compute diagnostics: {:?}", e)
-                }
+                Err(e) => error!("failed to compute diagnostics: {:?}", e),
                 Ok(params) => {
                     let not = RawNotification::new::<req::PublishDiagnostics>(&params);
                     sender.send(Task::Notify(not));
                 }
             }
             match handlers::publish_decorations(&world, file_id) {
-                Err(e) => {
-                    error!("failed to compute decorations: {:?}", e)
-                }
+                Err(e) => error!("failed to compute decorations: {:?}", e),
                 Ok(params) => {
                     let not = RawNotification::new::<req::PublishDecorations>(&params);
                     sender.send(Task::Notify(not))
diff --git a/crates/ra_lsp_server/src/main_loop/subscriptions.rs b/crates/ra_lsp_server/src/main_loop/subscriptions.rs
index 31015338287..03f41e8705f 100644
--- a/crates/ra_lsp_server/src/main_loop/subscriptions.rs
+++ b/crates/ra_lsp_server/src/main_loop/subscriptions.rs
@@ -1,5 +1,5 @@
-use rustc_hash::FxHashSet;
 use ra_analysis::FileId;
+use rustc_hash::FxHashSet;
 
 pub struct Subscriptions {
     subs: FxHashSet<FileId>,
@@ -7,7 +7,9 @@ pub struct Subscriptions {
 
 impl Subscriptions {
     pub fn new() -> Subscriptions {
-        Subscriptions { subs: FxHashSet::default() }
+        Subscriptions {
+            subs: FxHashSet::default(),
+        }
     }
     pub fn add_sub(&mut self, file_id: FileId) {
         self.subs.insert(file_id);
diff --git a/crates/ra_lsp_server/src/path_map.rs b/crates/ra_lsp_server/src/path_map.rs
index 19c3b1d3bc1..585013acd3e 100644
--- a/crates/ra_lsp_server/src/path_map.rs
+++ b/crates/ra_lsp_server/src/path_map.rs
@@ -1,11 +1,13 @@
-use std::path::{PathBuf, Path, Component};
 use im;
-use relative_path::RelativePath;
 use ra_analysis::{FileId, FileResolver};
+use relative_path::RelativePath;
+
+use std::path::{Component, Path, PathBuf};
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub enum Root {
-    Workspace, Lib
+    Workspace,
+    Lib,
 }
 
 #[derive(Debug, Default, Clone)]
@@ -21,7 +23,8 @@ impl PathMap {
         Default::default()
     }
     pub fn get_or_insert(&mut self, path: PathBuf, root: Root) -> FileId {
-        self.path2id.get(path.as_path())
+        self.path2id
+            .get(path.as_path())
             .map(|&id| id)
             .unwrap_or_else(|| {
                 let id = self.new_file_id();
@@ -33,9 +36,7 @@ impl PathMap {
         self.path2id.get(path).map(|&id| id)
     }
     pub fn get_path(&self, file_id: FileId) -> &Path {
-        self.id2path.get(&file_id)
-            .unwrap()
-            .as_path()
+        self.id2path.get(&file_id).unwrap().as_path()
     }
     pub fn get_root(&self, file_id: FileId) -> Root {
         self.id2root[&file_id]
@@ -55,7 +56,12 @@ impl PathMap {
 
 impl FileResolver for PathMap {
     fn file_stem(&self, file_id: FileId) -> String {
-        self.get_path(file_id).file_stem().unwrap().to_str().unwrap().to_string()
+        self.get_path(file_id)
+            .file_stem()
+            .unwrap()
+            .to_str()
+            .unwrap()
+            .to_string()
     }
 
     fn resolve(&self, file_id: FileId, path: &RelativePath) -> Option<FileId> {
@@ -101,10 +107,6 @@ mod test {
         let mut m = PathMap::new();
         let id1 = m.get_or_insert(PathBuf::from("/foo"), Root::Workspace);
         let id2 = m.get_or_insert(PathBuf::from("/foo/bar.rs"), Root::Workspace);
-        assert_eq!(
-            m.resolve(id1, &RelativePath::new("bar.rs")),
-            Some(id2),
-        )
+        assert_eq!(m.resolve(id1, &RelativePath::new("bar.rs")), Some(id2),)
     }
 }
-
diff --git a/crates/ra_lsp_server/src/project_model.rs b/crates/ra_lsp_server/src/project_model.rs
index c144d95960c..d170ceb7335 100644
--- a/crates/ra_lsp_server/src/project_model.rs
+++ b/crates/ra_lsp_server/src/project_model.rs
@@ -1,13 +1,12 @@
-use std::{
-    path::{Path, PathBuf},
-};
-use rustc_hash::{FxHashMap, FxHashSet};
 use cargo_metadata::{metadata_run, CargoOpt};
 use ra_syntax::SmolStr;
+use rustc_hash::{FxHashMap, FxHashSet};
+
+use std::path::{Path, PathBuf};
 
 use crate::{
+    thread_watcher::{ThreadWatcher, Worker},
     Result,
-    thread_watcher::{Worker, ThreadWatcher},
 };
 
 #[derive(Debug, Clone)]
@@ -39,7 +38,12 @@ struct TargetData {
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub enum TargetKind {
-    Bin, Lib, Example, Test, Bench, Other,
+    Bin,
+    Lib,
+    Example,
+    Test,
+    Bench,
+    Other,
 }
 
 impl Package {
@@ -49,7 +53,7 @@ impl Package {
     pub fn root(self, ws: &CargoWorkspace) -> &Path {
         ws.pkg(self).manifest.parent().unwrap()
     }
-    pub fn targets<'a>(self, ws: &'a CargoWorkspace) -> impl Iterator<Item=Target> + 'a {
+    pub fn targets<'a>(self, ws: &'a CargoWorkspace) -> impl Iterator<Item = Target> + 'a {
         ws.pkg(self).targets.iter().cloned()
     }
     pub fn is_member(self, ws: &CargoWorkspace) -> bool {
@@ -78,13 +82,15 @@ impl CargoWorkspace {
         let meta = metadata_run(
             Some(cargo_toml.as_path()),
             true,
-            Some(CargoOpt::AllFeatures)
-        ).map_err(|e| format_err!("cargo metadata failed: {}", e))?;
+            Some(CargoOpt::AllFeatures),
+        )
+        .map_err(|e| format_err!("cargo metadata failed: {}", e))?;
         let mut pkg_by_id = FxHashMap::default();
         let mut packages = Vec::new();
         let mut targets = Vec::new();
 
-        let ws_members: FxHashSet<String> = meta.workspace_members
+        let ws_members: FxHashSet<String> = meta
+            .workspace_members
             .into_iter()
             .map(|it| it.raw)
             .collect();
@@ -114,7 +120,7 @@ impl CargoWorkspace {
 
         Ok(CargoWorkspace { packages, targets })
     }
-    pub fn packages<'a>(&'a self) -> impl Iterator<Item=Package> + 'a {
+    pub fn packages<'a>(&'a self) -> impl Iterator<Item = Package> + 'a {
         (0..self.packages.len()).map(Package)
     }
     pub fn target_by_root(&self, root: &Path) -> Option<Target> {
@@ -155,7 +161,7 @@ impl TargetKind {
                 "example" => TargetKind::Example,
                 _ if kind.contains("lib") => TargetKind::Lib,
                 _ => continue,
-            }
+            };
         }
         TargetKind::Other
     }
@@ -170,6 +176,6 @@ pub fn workspace_loader() -> (Worker<PathBuf, Result<CargoWorkspace>>, ThreadWat
                 .into_iter()
                 .map(|path| CargoWorkspace::from_cargo_metadata(path.as_path()))
                 .for_each(|it| output_sender.send(it))
-        }
+        },
     )
 }
diff --git a/crates/ra_lsp_server/src/req.rs b/crates/ra_lsp_server/src/req.rs
index 1630edf7fae..b76bfbcbc67 100644
--- a/crates/ra_lsp_server/src/req.rs
+++ b/crates/ra_lsp_server/src/req.rs
@@ -1,20 +1,13 @@
+use languageserver_types::{Location, Position, Range, TextDocumentIdentifier, Url};
 use rustc_hash::FxHashMap;
-use languageserver_types::{TextDocumentIdentifier, Range, Url, Position, Location};
 use url_serde;
 
 pub use languageserver_types::{
-    request::*, notification::*,
-    InitializeResult, PublishDiagnosticsParams,
-    DocumentSymbolParams, DocumentSymbolResponse,
-    CodeActionParams, ApplyWorkspaceEditParams,
-    ExecuteCommandParams,
-    WorkspaceSymbolParams,
-    TextDocumentPositionParams,
-    TextEdit,
-    CompletionParams, CompletionResponse,
-    DocumentOnTypeFormattingParams,
-    TextDocumentEdit,
-    SignatureHelp, Hover
+    notification::*, request::*, ApplyWorkspaceEditParams, CodeActionParams, CompletionParams,
+    CompletionResponse, DocumentOnTypeFormattingParams, DocumentSymbolParams,
+    DocumentSymbolResponse, ExecuteCommandParams, Hover, InitializeResult,
+    PublishDiagnosticsParams, SignatureHelp, TextDocumentEdit, TextDocumentPositionParams,
+    TextEdit, WorkspaceSymbolParams,
 };
 
 pub enum SyntaxTree {}
@@ -28,7 +21,7 @@ impl Request for SyntaxTree {
 #[derive(Deserialize, Debug)]
 #[serde(rename_all = "camelCase")]
 pub struct SyntaxTreeParams {
-    pub text_document: TextDocumentIdentifier
+    pub text_document: TextDocumentIdentifier,
 }
 
 pub enum ExtendSelection {}
@@ -94,7 +87,7 @@ pub struct PublishDecorationsParams {
 #[serde(rename_all = "camelCase")]
 pub struct Decoration {
     pub range: Range,
-    pub tag: &'static str
+    pub tag: &'static str,
 }
 
 pub enum ParentModule {}
@@ -167,14 +160,14 @@ pub struct SourceChange {
 pub enum FileSystemEdit {
     CreateFile {
         #[serde(with = "url_serde")]
-        uri: Url
+        uri: Url,
     },
     MoveFile {
         #[serde(with = "url_serde")]
         src: Url,
         #[serde(with = "url_serde")]
         dst: Url,
-    }
+    },
 }
 
 pub enum InternalFeedback {}
diff --git a/crates/ra_lsp_server/src/server_world.rs b/crates/ra_lsp_server/src/server_world.rs
index 9b3013ae8b4..35ff65ea161 100644
--- a/crates/ra_lsp_server/src/server_world.rs
+++ b/crates/ra_lsp_server/src/server_world.rs
@@ -1,18 +1,18 @@
 use std::{
     fs,
-    path::{PathBuf, Path},
+    path::{Path, PathBuf},
     sync::Arc,
 };
 
-use rustc_hash::FxHashMap;
 use languageserver_types::Url;
-use ra_analysis::{FileId, AnalysisHost, Analysis, CrateGraph, CrateId, LibraryData, FileResolver};
+use ra_analysis::{Analysis, AnalysisHost, CrateGraph, CrateId, FileId, FileResolver, LibraryData};
+use rustc_hash::FxHashMap;
 
 use crate::{
-    Result,
     path_map::{PathMap, Root},
-    vfs::{FileEvent, FileEventKind},
     project_model::CargoWorkspace,
+    vfs::{FileEvent, FileEventKind},
+    Result,
 };
 
 #[derive(Debug)]
@@ -42,16 +42,15 @@ impl ServerWorldState {
         {
             let pm = &mut self.path_map;
             let mm = &mut self.mem_map;
-            let changes = events.into_iter()
+            let changes = events
+                .into_iter()
                 .map(|event| {
                     let text = match event.kind {
                         FileEventKind::Add(text) => Some(text),
                     };
                     (event.path, text)
                 })
-                .map(|(path, text)| {
-                    (pm.get_or_insert(path, Root::Workspace), text)
-                })
+                .map(|(path, text)| (pm.get_or_insert(path, Root::Workspace), text))
                 .filter_map(|(id, text)| {
                     if mm.contains_key(&id) {
                         mm.insert(id, text);
@@ -62,12 +61,17 @@ impl ServerWorldState {
                 });
             self.analysis_host.change_files(changes);
         }
-        self.analysis_host.set_file_resolver(Arc::new(self.path_map.clone()));
+        self.analysis_host
+            .set_file_resolver(Arc::new(self.path_map.clone()));
     }
-    pub fn events_to_files(&mut self, events: Vec<FileEvent>) -> (Vec<(FileId, String)>, Arc<FileResolver>) {
+    pub fn events_to_files(
+        &mut self,
+        events: Vec<FileEvent>,
+    ) -> (Vec<(FileId, String)>, Arc<FileResolver>) {
         let files = {
             let pm = &mut self.path_map;
-            events.into_iter()
+            events
+                .into_iter()
                 .map(|event| {
                     let text = match event.kind {
                         FileEventKind::Add(text) => text,
@@ -86,7 +90,8 @@ impl ServerWorldState {
 
     pub fn add_mem_file(&mut self, path: PathBuf, text: String) -> FileId {
         let file_id = self.path_map.get_or_insert(path, Root::Workspace);
-        self.analysis_host.set_file_resolver(Arc::new(self.path_map.clone()));
+        self.analysis_host
+            .set_file_resolver(Arc::new(self.path_map.clone()));
         self.mem_map.insert(file_id, None);
         if self.path_map.get_root(file_id) != Root::Lib {
             self.analysis_host.change_file(file_id, Some(text));
@@ -95,9 +100,10 @@ impl ServerWorldState {
     }
 
     pub fn change_mem_file(&mut self, path: &Path, text: String) -> Result<()> {
-        let file_id = self.path_map.get_id(path).ok_or_else(|| {
-            format_err!("change to unknown file: {}", path.display())
-        })?;
+        let file_id = self
+            .path_map
+            .get_id(path)
+            .ok_or_else(|| format_err!("change to unknown file: {}", path.display()))?;
         if self.path_map.get_root(file_id) != Root::Lib {
             self.analysis_host.change_file(file_id, Some(text));
         }
@@ -105,9 +111,10 @@ impl ServerWorldState {
     }
 
     pub fn remove_mem_file(&mut self, path: &Path) -> Result<FileId> {
-        let file_id = self.path_map.get_id(path).ok_or_else(|| {
-            format_err!("change to unknown file: {}", path.display())
-        })?;
+        let file_id = self
+            .path_map
+            .get_id(path)
+            .ok_or_else(|| format_err!("change to unknown file: {}", path.display()))?;
         match self.mem_map.remove(&file_id) {
             Some(_) => (),
             None => bail!("unmatched close notification"),
@@ -122,17 +129,17 @@ impl ServerWorldState {
     pub fn set_workspaces(&mut self, ws: Vec<CargoWorkspace>) {
         let mut crate_roots = FxHashMap::default();
         ws.iter()
-          .flat_map(|ws| {
-              ws.packages()
-                .flat_map(move |pkg| pkg.targets(ws))
-                .map(move |tgt| tgt.root(ws))
-          })
-          .for_each(|root| {
-              if let Some(file_id) = self.path_map.get_id(root) {
-                  let crate_id = CrateId(crate_roots.len() as u32);
-                  crate_roots.insert(crate_id, file_id);
-              }
-          });
+            .flat_map(|ws| {
+                ws.packages()
+                    .flat_map(move |pkg| pkg.targets(ws))
+                    .map(move |tgt| tgt.root(ws))
+            })
+            .for_each(|root| {
+                if let Some(file_id) = self.path_map.get_id(root) {
+                    let crate_id = CrateId(crate_roots.len() as u32);
+                    crate_roots.insert(crate_id, file_id);
+                }
+            });
         let crate_graph = CrateGraph { crate_roots };
         self.workspaces = Arc::new(ws);
         self.analysis_host.set_crate_graph(crate_graph);
@@ -141,7 +148,7 @@ impl ServerWorldState {
         ServerWorld {
             workspaces: Arc::clone(&self.workspaces),
             analysis: self.analysis_host.analysis(),
-            path_map: self.path_map.clone()
+            path_map: self.path_map.clone(),
         }
     }
 }
@@ -152,9 +159,12 @@ impl ServerWorld {
     }
 
     pub fn uri_to_file_id(&self, uri: &Url) -> Result<FileId> {
-        let path = uri.to_file_path()
+        let path = uri
+            .to_file_path()
             .map_err(|()| format_err!("invalid uri: {}", uri))?;
-        self.path_map.get_id(&path).ok_or_else(|| format_err!("unknown file: {}", path.display()))
+        self.path_map
+            .get_id(&path)
+            .ok_or_else(|| format_err!("unknown file: {}", path.display()))
     }
 
     pub fn file_id_to_uri(&self, id: FileId) -> Result<Url> {
diff --git a/crates/ra_lsp_server/src/thread_watcher.rs b/crates/ra_lsp_server/src/thread_watcher.rs
index 3257effcba3..67952eb747a 100644
--- a/crates/ra_lsp_server/src/thread_watcher.rs
+++ b/crates/ra_lsp_server/src/thread_watcher.rs
@@ -1,7 +1,8 @@
-use std::thread;
-use crossbeam_channel::{bounded, unbounded, Sender, Receiver};
-use drop_bomb::DropBomb;
 use crate::Result;
+use crossbeam_channel::{bounded, unbounded, Receiver, Sender};
+use drop_bomb::DropBomb;
+
+use std::thread;
 
 pub struct Worker<I, O> {
     pub inp: Sender<I>,
@@ -50,11 +51,13 @@ impl ThreadWatcher {
         info!("waiting for {} to finish ...", self.name);
         let name = self.name;
         self.bomb.defuse();
-        let res = self.thread.join()
+        let res = self
+            .thread
+            .join()
             .map_err(|_| format_err!("ThreadWatcher {} died", name));
         match &res {
             Ok(()) => info!("... {} terminated with ok", name),
-            Err(_) => error!("... {} terminated with err", name)
+            Err(_) => error!("... {} terminated with err", name),
         }
         res
     }
@@ -66,5 +69,9 @@ impl ThreadWatcher {
 fn worker_chan<I, O>(buf: usize) -> ((Sender<I>, Receiver<O>), Receiver<I>, Sender<O>) {
     let (input_sender, input_receiver) = bounded::<I>(buf);
     let (output_sender, output_receiver) = unbounded::<O>();
-    ((input_sender, output_receiver), input_receiver, output_sender)
+    (
+        (input_sender, output_receiver),
+        input_receiver,
+        output_sender,
+    )
 }
diff --git a/crates/ra_lsp_server/src/vfs.rs b/crates/ra_lsp_server/src/vfs.rs
index d8f9b1aac9a..417a3c19ae4 100644
--- a/crates/ra_lsp_server/src/vfs.rs
+++ b/crates/ra_lsp_server/src/vfs.rs
@@ -1,14 +1,11 @@
 use std::{
-    path::{PathBuf, Path},
     fs,
+    path::{Path, PathBuf},
 };
 
 use walkdir::WalkDir;
 
-use crate::{
-    thread_watcher::{Worker, ThreadWatcher},
-};
-
+use crate::thread_watcher::{ThreadWatcher, Worker};
 
 #[derive(Debug)]
 pub struct FileEvent {
@@ -24,7 +21,8 @@ pub enum FileEventKind {
 pub fn roots_loader() -> (Worker<PathBuf, (PathBuf, Vec<FileEvent>)>, ThreadWatcher) {
     Worker::<PathBuf, (PathBuf, Vec<FileEvent>)>::spawn(
         "roots loader",
-        128, |input_receiver, output_sender| {
+        128,
+        |input_receiver, output_sender| {
             input_receiver
                 .into_iter()
                 .map(|path| {
@@ -34,7 +32,7 @@ pub fn roots_loader() -> (Worker<PathBuf, (PathBuf, Vec<FileEvent>)>, ThreadWatc
                     (path, events)
                 })
                 .for_each(|it| output_sender.send(it))
-        }
+        },
     )
 }
 
diff --git a/crates/ra_lsp_server/tests/heavy_tests/main.rs b/crates/ra_lsp_server/tests/heavy_tests/main.rs
index 7265b5999e9..8e566d3c8fb 100644
--- a/crates/ra_lsp_server/tests/heavy_tests/main.rs
+++ b/crates/ra_lsp_server/tests/heavy_tests/main.rs
@@ -1,12 +1,12 @@
 #[macro_use]
 extern crate crossbeam_channel;
-extern crate tempdir;
+extern crate flexi_logger;
+extern crate gen_lsp_server;
 extern crate languageserver_types;
+extern crate ra_lsp_server;
 extern crate serde;
 extern crate serde_json;
-extern crate gen_lsp_server;
-extern crate flexi_logger;
-extern crate ra_lsp_server;
+extern crate tempdir;
 
 mod support;
 
@@ -14,17 +14,18 @@ use ra_lsp_server::req::{Runnables, RunnablesParams};
 
 use crate::support::project;
 
-
 const LOG: &'static str = "";
 
 #[test]
 fn test_runnables_no_project() {
-    let server = project(r"
+    let server = project(
+        r"
 //- lib.rs
 #[test]
 fn foo() {
 }
-");
+",
+    );
     server.request::<Runnables>(
         RunnablesParams {
             text_document: server.doc_id("lib.rs"),
@@ -41,13 +42,14 @@ fn foo() {
               "start": { "character": 0, "line": 0 }
             }
           }
-        ]"#
+        ]"#,
     );
 }
 
 #[test]
 fn test_runnables_project() {
-    let server = project(r#"
+    let server = project(
+        r#"
 //- Cargo.toml
 [package]
 name = "foo"
@@ -59,7 +61,8 @@ pub fn foo() {}
 //- tests/spam.rs
 #[test]
 fn test_eggs() {}
-"#);
+"#,
+    );
     server.wait_for_feedback("workspace loaded");
     server.request::<Runnables>(
         RunnablesParams {
diff --git a/crates/ra_lsp_server/tests/heavy_tests/support.rs b/crates/ra_lsp_server/tests/heavy_tests/support.rs
index d1339f62fcc..004d7e8adde 100644
--- a/crates/ra_lsp_server/tests/heavy_tests/support.rs
+++ b/crates/ra_lsp_server/tests/heavy_tests/support.rs
@@ -1,34 +1,33 @@
 use std::{
-    fs,
     cell::{Cell, RefCell},
+    fs,
     path::PathBuf,
-    time::Duration,
     sync::Once,
+    time::Duration,
 };
 
-use tempdir::TempDir;
 use crossbeam_channel::{after, Receiver};
 use flexi_logger::Logger;
+use gen_lsp_server::{RawMessage, RawNotification, RawRequest};
 use languageserver_types::{
-    Url,
-    TextDocumentIdentifier,
-    request::{Request, Shutdown},
     notification::DidOpenTextDocument,
-    DidOpenTextDocumentParams,
-    TextDocumentItem,
+    request::{Request, Shutdown},
+    DidOpenTextDocumentParams, TextDocumentIdentifier, TextDocumentItem, Url,
 };
 use serde::Serialize;
-use serde_json::{Value, from_str, to_string_pretty};
-use gen_lsp_server::{RawMessage, RawRequest, RawNotification};
+use serde_json::{from_str, to_string_pretty, Value};
+use tempdir::TempDir;
 
-use ra_lsp_server::{main_loop, req, thread_watcher::{ThreadWatcher, Worker}};
+use ra_lsp_server::{
+    main_loop, req,
+    thread_watcher::{ThreadWatcher, Worker},
+};
 
 pub fn project(fixture: &str) -> Server {
     static INIT: Once = Once::new();
     INIT.call_once(|| Logger::with_env_or_str(crate::LOG).start().unwrap());
 
-    let tmp_dir = TempDir::new("test-project")
-        .unwrap();
+    let tmp_dir = TempDir::new("test-project").unwrap();
     let mut buf = String::new();
     let mut file_name = None;
     let mut paths = vec![];
@@ -40,7 +39,7 @@ pub fn project(fixture: &str) -> Server {
                 fs::write(path.as_path(), buf.as_bytes()).unwrap();
                 paths.push((path, buf.clone()));
             }
-        }
+        };
     };
     for line in fixture.lines() {
         if line.starts_with("//-") {
@@ -71,9 +70,8 @@ impl Server {
             "test server",
             128,
             move |mut msg_receiver, mut msg_sender| {
-                main_loop(true, path, &mut msg_receiver, &mut msg_sender)
-                    .unwrap()
-            }
+                main_loop(true, path, &mut msg_receiver, &mut msg_sender).unwrap()
+            },
         );
         let res = Server {
             req_id: Cell::new(1),
@@ -91,8 +89,8 @@ impl Server {
                         language_id: "rust".to_string(),
                         version: 0,
                         text,
-                    }
-                }
+                    },
+                },
             ))
         }
         res
@@ -105,11 +103,7 @@ impl Server {
         }
     }
 
-    pub fn request<R>(
-        &self,
-        params: R::Params,
-        expected_resp: &str,
-    )
+    pub fn request<R>(&self, params: R::Params, expected_resp: &str)
     where
         R: Request,
         R::Params: Serialize,
@@ -119,7 +113,8 @@ impl Server {
         let expected_resp: Value = from_str(expected_resp).unwrap();
         let actual = self.send_request::<R>(id, params);
         assert_eq!(
-            expected_resp, actual,
+            expected_resp,
+            actual,
             "Expected:\n{}\n\
              Actual:\n{}\n",
             to_string_pretty(&expected_resp).unwrap(),
@@ -135,12 +130,9 @@ impl Server {
         let r = RawRequest::new::<R>(id, &params);
         self.send_request_(r)
     }
-    fn send_request_(&self, r: RawRequest) -> Value
-    {
+    fn send_request_(&self, r: RawRequest) -> Value {
         let id = r.id;
-        self.worker.as_ref()
-            .unwrap()
-            .send(RawMessage::Request(r));
+        self.worker.as_ref().unwrap().send(RawMessage::Request(r));
         while let Some(msg) = self.recv() {
             match msg {
                 RawMessage::Request(req) => panic!("unexpected request: {:?}", req),
@@ -161,11 +153,10 @@ impl Server {
     }
     pub fn wait_for_feedback_n(&self, feedback: &str, n: usize) {
         let f = |msg: &RawMessage| match msg {
-                RawMessage::Notification(n) if n.method == "internalFeedback" => {
-                    return n.clone().cast::<req::InternalFeedback>()
-                        .unwrap() == feedback
-                }
-                _ => false,
+            RawMessage::Notification(n) if n.method == "internalFeedback" => {
+                return n.clone().cast::<req::InternalFeedback>().unwrap() == feedback
+            }
+            _ => false,
         };
         let mut total = 0;
         for msg in self.messages.borrow().iter() {
@@ -181,14 +172,14 @@ impl Server {
         }
     }
     fn recv(&self) -> Option<RawMessage> {
-        recv_timeout(&self.worker.as_ref().unwrap().out)
-            .map(|msg| {
-                self.messages.borrow_mut().push(msg.clone());
-                msg
-            })
+        recv_timeout(&self.worker.as_ref().unwrap().out).map(|msg| {
+            self.messages.borrow_mut().push(msg.clone());
+            msg
+        })
     }
     fn send_notification(&self, not: RawNotification) {
-        self.worker.as_ref()
+        self.worker
+            .as_ref()
             .unwrap()
             .send(RawMessage::Notification(not));
     }
@@ -201,10 +192,7 @@ impl Drop for Server {
         while let Some(msg) = recv_timeout(&receiver) {
             drop(msg);
         }
-        self.watcher.take()
-            .unwrap()
-            .stop()
-            .unwrap();
+        self.watcher.take().unwrap().stop().unwrap();
     }
 }
 
diff --git a/crates/ra_syntax/src/algo/mod.rs b/crates/ra_syntax/src/algo/mod.rs
index e686a570442..b4896c48228 100644
--- a/crates/ra_syntax/src/algo/mod.rs
+++ b/crates/ra_syntax/src/algo/mod.rs
@@ -1,16 +1,18 @@
-pub mod walk;
 pub mod visit;
+pub mod walk;
 
 use crate::{
-    SyntaxNodeRef, TextUnit, TextRange,
     text_utils::{contains_offset_nonstrict, is_subrange},
+    SyntaxNodeRef, TextRange, TextUnit,
 };
 
 pub fn find_leaf_at_offset(node: SyntaxNodeRef, offset: TextUnit) -> LeafAtOffset {
     let range = node.range();
     assert!(
         contains_offset_nonstrict(range, offset),
-        "Bad offset: range {:?} offset {:?}", range, offset
+        "Bad offset: range {:?} offset {:?}",
+        range,
+        offset
     );
     if range.is_empty() {
         return LeafAtOffset::None;
@@ -20,20 +22,23 @@ pub fn find_leaf_at_offset(node: SyntaxNodeRef, offset: TextUnit) -> LeafAtOffse
         return LeafAtOffset::Single(node);
     }
 
-    let mut children = node.children()
-        .filter(|child| {
-            let child_range = child.range();
-            !child_range.is_empty() && contains_offset_nonstrict(child_range, offset)
-        });
+    let mut children = node.children().filter(|child| {
+        let child_range = child.range();
+        !child_range.is_empty() && contains_offset_nonstrict(child_range, offset)
+    });
 
     let left = children.next().unwrap();
     let right = children.next();
     assert!(children.next().is_none());
     return if let Some(right) = right {
-        match (find_leaf_at_offset(left, offset), find_leaf_at_offset(right, offset)) {
-            (LeafAtOffset::Single(left), LeafAtOffset::Single(right)) =>
-                LeafAtOffset::Between(left, right),
-            _ => unreachable!()
+        match (
+            find_leaf_at_offset(left, offset),
+            find_leaf_at_offset(right, offset),
+        ) {
+            (LeafAtOffset::Single(left), LeafAtOffset::Single(right)) => {
+                LeafAtOffset::Between(left, right)
+            }
+            _ => unreachable!(),
         }
     } else {
         find_leaf_at_offset(left, offset)
@@ -44,7 +49,7 @@ pub fn find_leaf_at_offset(node: SyntaxNodeRef, offset: TextUnit) -> LeafAtOffse
 pub enum LeafAtOffset<'a> {
     None,
     Single(SyntaxNodeRef<'a>),
-    Between(SyntaxNodeRef<'a>, SyntaxNodeRef<'a>)
+    Between(SyntaxNodeRef<'a>, SyntaxNodeRef<'a>),
 }
 
 impl<'a> LeafAtOffset<'a> {
@@ -52,7 +57,7 @@ impl<'a> LeafAtOffset<'a> {
         match self {
             LeafAtOffset::None => None,
             LeafAtOffset::Single(node) => Some(node),
-            LeafAtOffset::Between(_, right) => Some(right)
+            LeafAtOffset::Between(_, right) => Some(right),
         }
     }
 
@@ -60,7 +65,7 @@ impl<'a> LeafAtOffset<'a> {
         match self {
             LeafAtOffset::None => None,
             LeafAtOffset::Single(node) => Some(node),
-            LeafAtOffset::Between(left, _) => Some(left)
+            LeafAtOffset::Between(left, _) => Some(left),
         }
     }
 }
@@ -71,8 +76,14 @@ impl<'f> Iterator for LeafAtOffset<'f> {
     fn next(&mut self) -> Option<SyntaxNodeRef<'f>> {
         match *self {
             LeafAtOffset::None => None,
-            LeafAtOffset::Single(node) => { *self = LeafAtOffset::None; Some(node) }
-            LeafAtOffset::Between(left, right) => { *self = LeafAtOffset::Single(right); Some(left) }
+            LeafAtOffset::Single(node) => {
+                *self = LeafAtOffset::None;
+                Some(node)
+            }
+            LeafAtOffset::Between(left, right) => {
+                *self = LeafAtOffset::Single(right);
+                Some(left)
+            }
         }
     }
 }
@@ -81,14 +92,15 @@ pub fn find_covering_node(root: SyntaxNodeRef, range: TextRange) -> SyntaxNodeRe
     assert!(
         is_subrange(root.range(), range),
         "node range: {:?}, target range: {:?}",
-        root.range(), range,
+        root.range(),
+        range,
     );
     let (left, right) = match (
         find_leaf_at_offset(root, range.start()).right_biased(),
-        find_leaf_at_offset(root, range.end()).left_biased()
+        find_leaf_at_offset(root, range.end()).left_biased(),
     ) {
         (Some(l), Some(r)) => (l, r),
-        _ => return root
+        _ => return root,
     };
 
     common_ancestor(left, right)
@@ -103,7 +115,7 @@ fn common_ancestor<'a>(n1: SyntaxNodeRef<'a>, n2: SyntaxNodeRef<'a>) -> SyntaxNo
     panic!("Can't find common ancestor of {:?} and {:?}", n1, n2)
 }
 
-pub fn generate<T>(seed: Option<T>, step: impl Fn(&T) -> Option<T>) -> impl Iterator<Item=T> {
+pub fn generate<T>(seed: Option<T>, step: impl Fn(&T) -> Option<T>) -> impl Iterator<Item = T> {
     ::itertools::unfold(seed, move |slot| {
         slot.take().map(|curr| {
             *slot = step(&curr);
diff --git a/crates/ra_syntax/src/algo/visit.rs b/crates/ra_syntax/src/algo/visit.rs
index 1ae988a8777..c021f464c3f 100644
--- a/crates/ra_syntax/src/algo/visit.rs
+++ b/crates/ra_syntax/src/algo/visit.rs
@@ -1,23 +1,31 @@
+use crate::{AstNode, SyntaxNodeRef};
+
 use std::marker::PhantomData;
-use crate::{SyntaxNodeRef, AstNode};
 
-
-pub fn visitor<'a, T>() -> impl Visitor<'a, Output=T> {
+pub fn visitor<'a, T>() -> impl Visitor<'a, Output = T> {
     EmptyVisitor { ph: PhantomData }
 }
 
-pub fn visitor_ctx<'a, T, C>(ctx: C) -> impl VisitorCtx<'a, Output=T, Ctx=C> {
-    EmptyVisitorCtx { ph: PhantomData, ctx }
+pub fn visitor_ctx<'a, T, C>(ctx: C) -> impl VisitorCtx<'a, Output = T, Ctx = C> {
+    EmptyVisitorCtx {
+        ph: PhantomData,
+        ctx,
+    }
 }
 
 pub trait Visitor<'a>: Sized {
     type Output;
     fn accept(self, node: SyntaxNodeRef<'a>) -> Option<Self::Output>;
     fn visit<N, F>(self, f: F) -> Vis<Self, N, F>
-        where N: AstNode<'a>,
-              F: FnOnce(N) -> Self::Output,
+    where
+        N: AstNode<'a>,
+        F: FnOnce(N) -> Self::Output,
     {
-        Vis { inner: self, f, ph: PhantomData }
+        Vis {
+            inner: self,
+            f,
+            ph: PhantomData,
+        }
     }
 }
 
@@ -26,16 +34,21 @@ pub trait VisitorCtx<'a>: Sized {
     type Ctx;
     fn accept(self, node: SyntaxNodeRef<'a>) -> Result<Self::Output, Self::Ctx>;
     fn visit<N, F>(self, f: F) -> VisCtx<Self, N, F>
-        where N: AstNode<'a>,
-              F: FnOnce(N, Self::Ctx) -> Self::Output,
+    where
+        N: AstNode<'a>,
+        F: FnOnce(N, Self::Ctx) -> Self::Output,
     {
-        VisCtx { inner: self, f, ph: PhantomData }
+        VisCtx {
+            inner: self,
+            f,
+            ph: PhantomData,
+        }
     }
 }
 
 #[derive(Debug)]
 struct EmptyVisitor<T> {
-    ph: PhantomData<fn() -> T>
+    ph: PhantomData<fn() -> T>,
 }
 
 impl<'a, T> Visitor<'a> for EmptyVisitor<T> {
@@ -69,10 +82,10 @@ pub struct Vis<V, N, F> {
 }
 
 impl<'a, V, N, F> Visitor<'a> for Vis<V, N, F>
-    where
-        V: Visitor<'a>,
-        N: AstNode<'a>,
-        F: FnOnce(N) -> <V as Visitor<'a>>::Output,
+where
+    V: Visitor<'a>,
+    N: AstNode<'a>,
+    F: FnOnce(N) -> <V as Visitor<'a>>::Output,
 {
     type Output = <V as Visitor<'a>>::Output;
 
@@ -90,21 +103,19 @@ pub struct VisCtx<V, N, F> {
 }
 
 impl<'a, V, N, F> VisitorCtx<'a> for VisCtx<V, N, F>
-    where
-        V: VisitorCtx<'a>,
-        N: AstNode<'a>,
-        F: FnOnce(N, <V as VisitorCtx<'a>>::Ctx) -> <V as VisitorCtx<'a>>::Output,
+where
+    V: VisitorCtx<'a>,
+    N: AstNode<'a>,
+    F: FnOnce(N, <V as VisitorCtx<'a>>::Ctx) -> <V as VisitorCtx<'a>>::Output,
 {
     type Output = <V as VisitorCtx<'a>>::Output;
     type Ctx = <V as VisitorCtx<'a>>::Ctx;
 
     fn accept(self, node: SyntaxNodeRef<'a>) -> Result<Self::Output, Self::Ctx> {
         let VisCtx { inner, f, .. } = self;
-        inner.accept(node).or_else(|ctx|
-            match N::cast(node) {
-                None => Err(ctx),
-                Some(node) => Ok(f(node, ctx))
-            }
-        )
+        inner.accept(node).or_else(|ctx| match N::cast(node) {
+            None => Err(ctx),
+            Some(node) => Ok(f(node, ctx)),
+        })
     }
 }
diff --git a/crates/ra_syntax/src/algo/walk.rs b/crates/ra_syntax/src/algo/walk.rs
index d3441562623..9afa86401bf 100644
--- a/crates/ra_syntax/src/algo/walk.rs
+++ b/crates/ra_syntax/src/algo/walk.rs
@@ -1,8 +1,4 @@
-use crate::{
-    SyntaxNodeRef,
-    algo::generate,
-};
-
+use crate::{algo::generate, SyntaxNodeRef};
 
 #[derive(Debug, Copy, Clone)]
 pub enum WalkEvent<'a> {
diff --git a/crates/ra_syntax/src/ast/generated.rs b/crates/ra_syntax/src/ast/generated.rs
index 160d186b8d8..a15e0017692 100644
--- a/crates/ra_syntax/src/ast/generated.rs
+++ b/crates/ra_syntax/src/ast/generated.rs
@@ -1,6 +1,8 @@
 // This file is automatically generated based on the file `./generated.rs.tera` when `cargo gen-kinds` is run
 // Do not edit manually
 
+#![cfg_attr(rustfmt, rustfmt_skip)]
+
 use crate::{
     ast,
     SyntaxNodeRef, AstNode,
diff --git a/crates/ra_syntax/src/ast/generated.rs.tera b/crates/ra_syntax/src/ast/generated.rs.tera
index 5cb7a35ed91..d2a281137e1 100644
--- a/crates/ra_syntax/src/ast/generated.rs.tera
+++ b/crates/ra_syntax/src/ast/generated.rs.tera
@@ -3,6 +3,8 @@ the below applies to the result of this template
 #}// This file is automatically generated based on the file `./generated.rs.tera` when `cargo gen-kinds` is run
 // Do not edit manually
 
+#![cfg_attr(rustfmt, rustfmt_skip)]
+
 use crate::{
     ast,
     SyntaxNodeRef, AstNode,
diff --git a/crates/ra_syntax/src/ast/mod.rs b/crates/ra_syntax/src/ast/mod.rs
index 88193a1edec..34958b6cb3b 100644
--- a/crates/ra_syntax/src/ast/mod.rs
+++ b/crates/ra_syntax/src/ast/mod.rs
@@ -4,15 +4,18 @@ use std::marker::PhantomData;
 
 use itertools::Itertools;
 
-use crate::{
-    SmolStr, SyntaxNodeRef, SyntaxKind::*,
-    yellow::{RefRoot, SyntaxNodeChildren},
-};
 pub use self::generated::*;
+use crate::{
+    yellow::{RefRoot, SyntaxNodeChildren},
+    SmolStr,
+    SyntaxKind::*,
+    SyntaxNodeRef,
+};
 
 pub trait AstNode<'a>: Clone + Copy + 'a {
     fn cast(syntax: SyntaxNodeRef<'a>) -> Option<Self>
-        where Self: Sized;
+    where
+        Self: Sized;
     fn syntax(self) -> SyntaxNodeRef<'a>;
 }
 
@@ -64,9 +67,7 @@ pub trait AttrsOwner<'a>: AstNode<'a> {
 
 impl<'a> FnDef<'a> {
     pub fn has_atom_attr(&self, atom: &str) -> bool {
-        self.attrs()
-            .filter_map(|x| x.as_atom())
-            .any(|x| x == atom)
+        self.attrs().filter_map(|x| x.as_atom()).any(|x| x == atom)
     }
 }
 
@@ -135,7 +136,7 @@ pub enum CommentFlavor {
     Line,
     Doc,
     ModuleDoc,
-    Multiline
+    Multiline,
 }
 
 impl CommentFlavor {
@@ -145,7 +146,7 @@ impl CommentFlavor {
             Line => "//",
             Doc => "///",
             ModuleDoc => "//!",
-            Multiline => "/*"
+            Multiline => "/*",
         }
     }
 }
@@ -166,16 +167,14 @@ impl<'a> Whitespace<'a> {
 
 impl<'a> Name<'a> {
     pub fn text(&self) -> SmolStr {
-        let ident = self.syntax().first_child()
-            .unwrap();
+        let ident = self.syntax().first_child().unwrap();
         ident.leaf_text().unwrap().clone()
     }
 }
 
 impl<'a> NameRef<'a> {
     pub fn text(&self) -> SmolStr {
-        let ident = self.syntax().first_child()
-            .unwrap();
+        let ident = self.syntax().first_child().unwrap();
         ident.leaf_text().unwrap().clone()
     }
 }
@@ -241,7 +240,6 @@ fn children<'a, P: AstNode<'a>, C: AstNode<'a>>(parent: P) -> AstChildren<'a, C>
     AstChildren::new(parent.syntax())
 }
 
-
 #[derive(Debug)]
 pub struct AstChildren<'a, N> {
     inner: SyntaxNodeChildren<RefRoot<'a>>,
diff --git a/crates/ra_syntax/src/grammar/expressions/atom.rs b/crates/ra_syntax/src/grammar/expressions/atom.rs
index e21de68c5bd..11f766d3356 100644
--- a/crates/ra_syntax/src/grammar/expressions/atom.rs
+++ b/crates/ra_syntax/src/grammar/expressions/atom.rs
@@ -13,9 +13,18 @@ use super::*;
 //     let _ = b"e";
 //     let _ = br"f";
 // }
-pub(crate) const LITERAL_FIRST: TokenSet =
-    token_set![TRUE_KW, FALSE_KW, INT_NUMBER, FLOAT_NUMBER, BYTE, CHAR,
-               STRING, RAW_STRING, BYTE_STRING, RAW_BYTE_STRING];
+pub(crate) const LITERAL_FIRST: TokenSet = token_set![
+    TRUE_KW,
+    FALSE_KW,
+    INT_NUMBER,
+    FLOAT_NUMBER,
+    BYTE,
+    CHAR,
+    STRING,
+    RAW_STRING,
+    BYTE_STRING,
+    RAW_BYTE_STRING
+];
 
 pub(crate) fn literal(p: &mut Parser) -> Option<CompletedMarker> {
     if !p.at_ts(LITERAL_FIRST) {
@@ -26,15 +35,31 @@ pub(crate) fn literal(p: &mut Parser) -> Option<CompletedMarker> {
     Some(m.complete(p, LITERAL))
 }
 
-pub(super) const ATOM_EXPR_FIRST: TokenSet =
-    token_set_union![
-        LITERAL_FIRST,
-        token_set![L_CURLY, L_PAREN, L_BRACK, PIPE, MOVE_KW, IF_KW, WHILE_KW, MATCH_KW, UNSAFE_KW,
-                   RETURN_KW, IDENT, SELF_KW, SUPER_KW, CRATE_KW, COLONCOLON, BREAK_KW, CONTINUE_KW, LIFETIME ],
-    ];
+pub(super) const ATOM_EXPR_FIRST: TokenSet = token_set_union![
+    LITERAL_FIRST,
+    token_set![
+        L_CURLY,
+        L_PAREN,
+        L_BRACK,
+        PIPE,
+        MOVE_KW,
+        IF_KW,
+        WHILE_KW,
+        MATCH_KW,
+        UNSAFE_KW,
+        RETURN_KW,
+        IDENT,
+        SELF_KW,
+        SUPER_KW,
+        CRATE_KW,
+        COLONCOLON,
+        BREAK_KW,
+        CONTINUE_KW,
+        LIFETIME
+    ],
+];
 
-const EXPR_RECOVERY_SET: TokenSet =
-    token_set![LET_KW];
+const EXPR_RECOVERY_SET: TokenSet = token_set![LET_KW];
 
 pub(super) fn atom_expr(p: &mut Parser, r: Restrictions) -> Option<CompletedMarker> {
     match literal(p) {
@@ -80,7 +105,7 @@ pub(super) fn atom_expr(p: &mut Parser, r: Restrictions) -> Option<CompletedMark
             let m = p.start();
             p.bump();
             block_expr(p, Some(m))
-        },
+        }
         L_CURLY => block_expr(p, None),
         RETURN_KW => return_expr(p),
         CONTINUE_KW => continue_expr(p),
@@ -119,7 +144,14 @@ fn tuple_expr(p: &mut Parser) -> CompletedMarker {
         }
     }
     p.expect(R_PAREN);
-    m.complete(p, if saw_expr && !saw_comma { PAREN_EXPR } else { TUPLE_EXPR })
+    m.complete(
+        p,
+        if saw_expr && !saw_comma {
+            PAREN_EXPR
+        } else {
+            TUPLE_EXPR
+        },
+    )
 }
 
 // test array_expr
diff --git a/crates/ra_syntax/src/grammar/expressions/mod.rs b/crates/ra_syntax/src/grammar/expressions/mod.rs
index 20e0fa3289e..60c8602f9f0 100644
--- a/crates/ra_syntax/src/grammar/expressions/mod.rs
+++ b/crates/ra_syntax/src/grammar/expressions/mod.rs
@@ -1,23 +1,32 @@
 mod atom;
 
-use super::*;
-pub(super) use self::atom::{literal, LITERAL_FIRST};
 pub(crate) use self::atom::match_arm_list;
+pub(super) use self::atom::{literal, LITERAL_FIRST};
+use super::*;
 
 const EXPR_FIRST: TokenSet = LHS_FIRST;
 
 pub(super) fn expr(p: &mut Parser) -> BlockLike {
-    let r = Restrictions { forbid_structs: false, prefer_stmt: false };
+    let r = Restrictions {
+        forbid_structs: false,
+        prefer_stmt: false,
+    };
     expr_bp(p, r, 1)
 }
 
 pub(super) fn expr_stmt(p: &mut Parser) -> BlockLike {
-    let r = Restrictions { forbid_structs: false, prefer_stmt: true };
+    let r = Restrictions {
+        forbid_structs: false,
+        prefer_stmt: true,
+    };
     expr_bp(p, r, 1)
 }
 
 fn expr_no_struct(p: &mut Parser) {
-    let r = Restrictions { forbid_structs: true, prefer_stmt: false };
+    let r = Restrictions {
+        forbid_structs: true,
+        prefer_stmt: false,
+    };
     expr_bp(p, r, 1);
 }
 
@@ -107,10 +116,8 @@ enum Op {
 fn current_op(p: &Parser) -> (u8, Op) {
     if let Some(t) = p.next3() {
         match t {
-            (L_ANGLE, L_ANGLE, EQ) =>
-                return (1, Op::Composite(SHLEQ, 3)),
-            (R_ANGLE, R_ANGLE, EQ) =>
-                return (1, Op::Composite(SHREQ, 3)),
+            (L_ANGLE, L_ANGLE, EQ) => return (1, Op::Composite(SHLEQ, 3)),
+            (R_ANGLE, R_ANGLE, EQ) => return (1, Op::Composite(SHREQ, 3)),
             _ => (),
         }
     }
@@ -201,11 +208,10 @@ fn is_block(kind: SyntaxKind) -> bool {
     }
 }
 
-const LHS_FIRST: TokenSet =
-    token_set_union![
-        token_set![AMP, STAR, EXCL, DOTDOT, MINUS],
-        atom::ATOM_EXPR_FIRST,
-    ];
+const LHS_FIRST: TokenSet = token_set_union![
+    token_set![AMP, STAR, EXCL, DOTDOT, MINUS],
+    atom::ATOM_EXPR_FIRST,
+];
 
 fn lhs(p: &mut Parser, r: Restrictions) -> Option<CompletedMarker> {
     let m;
@@ -265,11 +271,13 @@ fn postfix_expr(p: &mut Parser, r: Restrictions, mut lhs: CompletedMarker) -> Co
             // }
             L_PAREN if allow_calls => call_expr(p, lhs),
             L_BRACK if allow_calls => index_expr(p, lhs),
-            DOT if p.nth(1) == IDENT => if p.nth(2) == L_PAREN || p.nth(2) == COLONCOLON {
-                method_call_expr(p, lhs)
-            } else {
-                field_expr(p, lhs)
-            },
+            DOT if p.nth(1) == IDENT => {
+                if p.nth(2) == L_PAREN || p.nth(2) == COLONCOLON {
+                    method_call_expr(p, lhs)
+                } else {
+                    field_expr(p, lhs)
+                }
+            }
             DOT if p.nth(1) == INT_NUMBER => field_expr(p, lhs),
             // test postfix_range
             // fn foo() { let x = 1..; }
@@ -318,10 +326,7 @@ fn index_expr(p: &mut Parser, lhs: CompletedMarker) -> CompletedMarker {
 //     y.bar::<T>(1, 2,);
 // }
 fn method_call_expr(p: &mut Parser, lhs: CompletedMarker) -> CompletedMarker {
-    assert!(
-        p.at(DOT) && p.nth(1) == IDENT
-            && (p.nth(2) == L_PAREN || p.nth(2) == COLONCOLON)
-    );
+    assert!(p.at(DOT) && p.nth(1) == IDENT && (p.nth(2) == L_PAREN || p.nth(2) == COLONCOLON));
     let m = lhs.precede(p);
     p.bump();
     name_ref(p);
@@ -410,7 +415,7 @@ fn path_expr(p: &mut Parser, r: Restrictions) -> CompletedMarker {
             items::macro_call_after_excl(p);
             m.complete(p, MACRO_CALL)
         }
-        _ => m.complete(p, PATH_EXPR)
+        _ => m.complete(p, PATH_EXPR),
     }
 }
 
diff --git a/crates/ra_syntax/src/grammar/items/mod.rs b/crates/ra_syntax/src/grammar/items/mod.rs
index 2567313ab1c..dc4742bce95 100644
--- a/crates/ra_syntax/src/grammar/items/mod.rs
+++ b/crates/ra_syntax/src/grammar/items/mod.rs
@@ -1,16 +1,15 @@
-
 mod consts;
 mod nominal;
 mod traits;
 mod use_item;
 
-use super::*;
 pub(crate) use self::{
-    expressions::{named_field_list, match_arm_list},
+    expressions::{match_arm_list, named_field_list},
     nominal::{enum_variant_list, named_field_def_list},
-    traits::{trait_item_list, impl_item_list},
+    traits::{impl_item_list, trait_item_list},
     use_item::use_tree_list,
 };
+use super::*;
 
 // test mod_contents
 // fn foo() {}
@@ -26,12 +25,14 @@ pub(super) fn mod_contents(p: &mut Parser, stop_on_r_curly: bool) {
 }
 
 pub(super) enum ItemFlavor {
-    Mod, Trait
+    Mod,
+    Trait,
 }
 
-const ITEM_RECOVERY_SET: TokenSet =
-    token_set![FN_KW, STRUCT_KW, ENUM_KW, IMPL_KW, TRAIT_KW, CONST_KW, STATIC_KW, LET_KW,
-               MOD_KW, PUB_KW, CRATE_KW];
+const ITEM_RECOVERY_SET: TokenSet = token_set![
+    FN_KW, STRUCT_KW, ENUM_KW, IMPL_KW, TRAIT_KW, CONST_KW, STATIC_KW, LET_KW, MOD_KW, PUB_KW,
+    CRATE_KW
+];
 
 pub(super) fn item_or_macro(p: &mut Parser, stop_on_r_curly: bool, flavor: ItemFlavor) {
     let m = p.start();
@@ -153,10 +154,12 @@ pub(super) fn maybe_item(p: &mut Parser, flavor: ItemFlavor) -> MaybeItem {
             traits::impl_item(p);
             IMPL_ITEM
         }
-        _ => return if has_mods {
-            MaybeItem::Modifiers
-        } else {
-            MaybeItem::None
+        _ => {
+            return if has_mods {
+                MaybeItem::Modifiers
+            } else {
+                MaybeItem::None
+            }
         }
     };
 
@@ -194,7 +197,7 @@ fn items_without_modifiers(p: &mut Parser) -> Option<SyntaxKind> {
             if p.at(SEMI) {
                 p.err_and_bump(
                     "expected item, found `;`\n\
-                     consider removing this semicolon"
+                     consider removing this semicolon",
                 );
             }
             STRUCT_DEF
@@ -227,7 +230,9 @@ fn items_without_modifiers(p: &mut Parser) -> Option<SyntaxKind> {
         }
         // test extern_block
         // extern {}
-        EXTERN_KW if la == L_CURLY || ((la == STRING || la == RAW_STRING) && p.nth(2) == L_CURLY) => {
+        EXTERN_KW
+            if la == L_CURLY || ((la == STRING || la == RAW_STRING) && p.nth(2) == L_CURLY) =>
+        {
             abi(p);
             extern_item_list(p);
             EXTERN_BLOCK
@@ -267,10 +272,8 @@ fn fn_def(p: &mut Parser, flavor: ItemFlavor) {
 
     if p.at(L_PAREN) {
         match flavor {
-            ItemFlavor::Mod =>
-                params::param_list(p),
-            ItemFlavor::Trait =>
-                params::param_list_opt_patterns(p),
+            ItemFlavor::Mod => params::param_list(p),
+            ItemFlavor::Trait => params::param_list_opt_patterns(p),
         }
     } else {
         p.error("expected function arguments");
@@ -361,7 +364,7 @@ pub(super) fn macro_call_after_excl(p: &mut Parser) -> BlockLike {
         _ => {
             p.error("expected `{`, `[`, `(`");
             BlockLike::NotBlock
-        },
+        }
     };
 
     flavor
@@ -385,9 +388,9 @@ pub(crate) fn token_tree(p: &mut Parser) {
                 return;
             }
             R_PAREN | R_BRACK => p.err_and_bump("unmatched brace"),
-            _ => p.bump()
+            _ => p.bump(),
         }
-    };
+    }
     p.expect(closing_paren_kind);
     m.complete(p, TOKEN_TREE);
 }
diff --git a/crates/ra_syntax/src/grammar/items/traits.rs b/crates/ra_syntax/src/grammar/items/traits.rs
index 5dfdb470ca8..31258c25373 100644
--- a/crates/ra_syntax/src/grammar/items/traits.rs
+++ b/crates/ra_syntax/src/grammar/items/traits.rs
@@ -128,4 +128,3 @@ pub(crate) fn impl_type(p: &mut Parser) {
     }
     types::type_(p);
 }
-
diff --git a/crates/ra_syntax/src/grammar/mod.rs b/crates/ra_syntax/src/grammar/mod.rs
index 1199ba2300e..c875640730a 100644
--- a/crates/ra_syntax/src/grammar/mod.rs
+++ b/crates/ra_syntax/src/grammar/mod.rs
@@ -31,28 +31,18 @@ mod type_args;
 mod type_params;
 mod types;
 
-use crate::{
-    token_set::TokenSet,
-    parser_api::{Marker, CompletedMarker, Parser},
-    SyntaxKind::{self, *},
-};
 pub(crate) use self::{
-    expressions::{
-        block,
-    },
+    expressions::block,
     items::{
-        enum_variant_list,
-        extern_item_list,
-        impl_item_list,
-        match_arm_list,
-        mod_item_list,
-        named_field_def_list,
-        named_field_list,
-        token_tree,
-        trait_item_list,
-        use_tree_list,
+        enum_variant_list, extern_item_list, impl_item_list, match_arm_list, mod_item_list,
+        named_field_def_list, named_field_list, token_tree, trait_item_list, use_tree_list,
     },
 };
+use crate::{
+    parser_api::{CompletedMarker, Marker, Parser},
+    token_set::TokenSet,
+    SyntaxKind::{self, *},
+};
 
 pub(crate) fn root(p: &mut Parser) {
     let m = p.start();
@@ -61,7 +51,6 @@ pub(crate) fn root(p: &mut Parser) {
     m.complete(p, ROOT);
 }
 
-
 #[derive(Clone, Copy, PartialEq, Eq)]
 enum BlockLike {
     Block,
@@ -69,7 +58,9 @@ enum BlockLike {
 }
 
 impl BlockLike {
-    fn is_block(self) -> bool { self == BlockLike::Block }
+    fn is_block(self) -> bool {
+        self == BlockLike::Block
+    }
 }
 
 fn opt_visibility(p: &mut Parser) {
diff --git a/crates/ra_syntax/src/grammar/params.rs b/crates/ra_syntax/src/grammar/params.rs
index 903c2593998..b71a72ca3e9 100644
--- a/crates/ra_syntax/src/grammar/params.rs
+++ b/crates/ra_syntax/src/grammar/params.rs
@@ -61,12 +61,8 @@ fn list_(p: &mut Parser, flavor: Flavor) {
     m.complete(p, PARAM_LIST);
 }
 
-
 const VALUE_PARAMETER_FIRST: TokenSet =
-    token_set_union![
-        patterns::PATTERN_FIRST,
-        types::TYPE_FIRST,
-    ];
+    token_set_union![patterns::PATTERN_FIRST, types::TYPE_FIRST,];
 
 fn value_parameter(p: &mut Parser, flavor: Flavor) {
     let m = p.start();
@@ -76,7 +72,7 @@ fn value_parameter(p: &mut Parser, flavor: Flavor) {
             if p.at(COLON) || flavor.type_required() {
                 types::ascription(p)
             }
-        },
+        }
         // test value_parameters_no_patterns
         // type F = Box<Fn(a: i32, &b: &i32, &mut c: &i32, ())>;
         Flavor::OptionalPattern => {
@@ -86,13 +82,14 @@ fn value_parameter(p: &mut Parser, flavor: Flavor) {
             let la3 = p.nth(3);
             if la0 == IDENT && la1 == COLON
                 || la0 == AMP && la1 == IDENT && la2 == COLON
-                || la0 == AMP && la1 == MUT_KW && la2 == IDENT && la3 == COLON {
+                || la0 == AMP && la1 == MUT_KW && la2 == IDENT && la3 == COLON
+            {
                 patterns::pattern(p);
                 types::ascription(p);
             } else {
                 types::type_(p);
             }
-        },
+        }
     }
     m.complete(p, PARAM);
 }
diff --git a/crates/ra_syntax/src/grammar/paths.rs b/crates/ra_syntax/src/grammar/paths.rs
index b6d44d53af3..a35a339ccac 100644
--- a/crates/ra_syntax/src/grammar/paths.rs
+++ b/crates/ra_syntax/src/grammar/paths.rs
@@ -97,7 +97,7 @@ fn opt_path_type_args(p: &mut Parser, mode: Mode) {
             } else {
                 type_args::opt_type_arg_list(p, false)
             }
-        },
+        }
         Mode::Expr => type_args::opt_type_arg_list(p, true),
     }
 }
diff --git a/crates/ra_syntax/src/grammar/patterns.rs b/crates/ra_syntax/src/grammar/patterns.rs
index 420bae7a77e..9d35dbb3d8d 100644
--- a/crates/ra_syntax/src/grammar/patterns.rs
+++ b/crates/ra_syntax/src/grammar/patterns.rs
@@ -1,11 +1,10 @@
 use super::*;
 
-pub(super) const PATTERN_FIRST: TokenSet =
-    token_set_union![
-        token_set![REF_KW, MUT_KW, L_PAREN, L_BRACK, AMP, UNDERSCORE],
-        expressions::LITERAL_FIRST,
-        paths::PATH_FIRST,
-    ];
+pub(super) const PATTERN_FIRST: TokenSet = token_set_union![
+    token_set![REF_KW, MUT_KW, L_PAREN, L_BRACK, AMP, UNDERSCORE],
+    expressions::LITERAL_FIRST,
+    paths::PATH_FIRST,
+];
 
 pub(super) fn pattern(p: &mut Parser) {
     pattern_r(p, PAT_RECOVERY_SET)
@@ -29,12 +28,13 @@ pub(super) fn pattern_r(p: &mut Parser, recovery_set: TokenSet) {
 const PAT_RECOVERY_SET: TokenSet =
     token_set![LET_KW, IF_KW, WHILE_KW, LOOP_KW, MATCH_KW, R_PAREN, COMMA];
 
-
 fn atom_pat(p: &mut Parser, recovery_set: TokenSet) -> Option<CompletedMarker> {
     let la0 = p.nth(0);
     let la1 = p.nth(1);
-    if la0 == REF_KW || la0 == MUT_KW
-        || (la0 == IDENT && !(la1 == COLONCOLON || la1 == L_PAREN || la1 == L_CURLY)) {
+    if la0 == REF_KW
+        || la0 == MUT_KW
+        || (la0 == IDENT && !(la1 == COLONCOLON || la1 == L_PAREN || la1 == L_CURLY))
+    {
         return Some(bind_pat(p, true));
     }
     if paths::is_path_start(p) {
@@ -87,7 +87,7 @@ fn path_pat(p: &mut Parser) -> CompletedMarker {
             field_pat_list(p);
             STRUCT_PAT
         }
-        _ => PATH_PAT
+        _ => PATH_PAT,
     };
     m.complete(p, kind)
 }
@@ -195,7 +195,7 @@ fn pat_list(p: &mut Parser, ket: SyntaxKind) {
                     break;
                 }
                 pattern(p)
-            },
+            }
         }
         if !p.at(ket) {
             p.expect(COMMA);
diff --git a/crates/ra_syntax/src/grammar/type_params.rs b/crates/ra_syntax/src/grammar/type_params.rs
index 79bc95ce414..79f5036b415 100644
--- a/crates/ra_syntax/src/grammar/type_params.rs
+++ b/crates/ra_syntax/src/grammar/type_params.rs
@@ -72,12 +72,8 @@ pub(super) fn bounds_without_colon(p: &mut Parser) {
         p.eat(QUESTION);
         match p.current() {
             LIFETIME => p.bump(),
-            FOR_KW => {
-                types::for_type(p)
-            }
-            _ if paths::is_path_start(p) => {
-                types::path_type(p)
-            }
+            FOR_KW => types::for_type(p),
+            _ if paths::is_path_start(p) => types::path_type(p),
             _ => break,
         }
         if has_paren {
@@ -104,7 +100,7 @@ pub(super) fn opt_where_clause(p: &mut Parser) {
     p.bump();
     loop {
         if !(paths::is_path_start(p) || p.current() == LIFETIME) {
-            break
+            break;
         }
         where_predicate(p);
         if p.current() != L_CURLY && p.current() != SEMI {
@@ -130,7 +126,6 @@ fn where_predicate(p: &mut Parser) {
         } else {
             p.error("expected colon")
         }
-
     }
     m.complete(p, WHERE_PRED);
 }
diff --git a/crates/ra_syntax/src/grammar/types.rs b/crates/ra_syntax/src/grammar/types.rs
index 27e5b086e3d..f308aef894e 100644
--- a/crates/ra_syntax/src/grammar/types.rs
+++ b/crates/ra_syntax/src/grammar/types.rs
@@ -1,15 +1,14 @@
 use super::*;
 
-pub(super) const TYPE_FIRST: TokenSet =
-    token_set_union![
-        token_set![
-            L_PAREN, EXCL, STAR, L_BRACK, AMP, UNDERSCORE, FN_KW, UNSAFE_KW, EXTERN_KW, FOR_KW, IMPL_KW, DYN_KW, L_ANGLE,
-        ],
-        paths::PATH_FIRST,
-    ];
+pub(super) const TYPE_FIRST: TokenSet = token_set_union![
+    token_set![
+        L_PAREN, EXCL, STAR, L_BRACK, AMP, UNDERSCORE, FN_KW, UNSAFE_KW, EXTERN_KW, FOR_KW,
+        IMPL_KW, DYN_KW, L_ANGLE,
+    ],
+    paths::PATH_FIRST,
+];
 
-const TYPE_RECOVERY_SET: TokenSet =
-    token_set![R_PAREN, COMMA];
+const TYPE_RECOVERY_SET: TokenSet = token_set![R_PAREN, COMMA];
 
 pub(super) fn type_(p: &mut Parser) {
     match p.current() {
@@ -200,7 +199,6 @@ pub(super) fn for_type(p: &mut Parser) {
         FN_KW | UNSAFE_KW | EXTERN_KW => fn_pointer_type(p),
         _ if paths::is_path_start(p) => path_type_(p, false),
         _ => p.error("expected a path"),
-
     }
     m.complete(p, FOR_TYPE);
 }
diff --git a/crates/ra_syntax/src/lexer/mod.rs b/crates/ra_syntax/src/lexer/mod.rs
index 9dc0b63d6b8..f388da273fa 100644
--- a/crates/ra_syntax/src/lexer/mod.rs
+++ b/crates/ra_syntax/src/lexer/mod.rs
@@ -58,12 +58,16 @@ fn next_token_inner(c: char, ptr: &mut Ptr) -> SyntaxKind {
     }
 
     match c {
-        '#' => if scan_shebang(ptr) {
-            return SHEBANG;
-        },
-        '/' => if let Some(kind) = scan_comment(ptr) {
-            return kind;
-        },
+        '#' => {
+            if scan_shebang(ptr) {
+                return SHEBANG;
+            }
+        }
+        '/' => {
+            if let Some(kind) = scan_comment(ptr) {
+                return kind;
+            }
+        }
         _ => (),
     }
 
diff --git a/crates/ra_syntax/src/lexer/ptr.rs b/crates/ra_syntax/src/lexer/ptr.rs
index c4708cb1c95..fa79d8862a4 100644
--- a/crates/ra_syntax/src/lexer/ptr.rs
+++ b/crates/ra_syntax/src/lexer/ptr.rs
@@ -134,10 +134,10 @@ mod tests {
     #[test]
     fn test_nth_is_p() {
         let ptr = Ptr::new("test");
-        assert!(ptr.nth_is_p(0,|c| c == 't'));
-        assert!(!ptr.nth_is_p(1,|c| c == 't'));
-        assert!(ptr.nth_is_p(3,|c| c == 't'));
-        assert!(!ptr.nth_is_p(150,|c| c == 't'));
+        assert!(ptr.nth_is_p(0, |c| c == 't'));
+        assert!(!ptr.nth_is_p(1, |c| c == 't'));
+        assert!(ptr.nth_is_p(3, |c| c == 't'));
+        assert!(!ptr.nth_is_p(150, |c| c == 't'));
     }
 
     #[test]
diff --git a/crates/ra_syntax/src/lexer/strings.rs b/crates/ra_syntax/src/lexer/strings.rs
index bceacdcac20..5090feae649 100644
--- a/crates/ra_syntax/src/lexer/strings.rs
+++ b/crates/ra_syntax/src/lexer/strings.rs
@@ -71,7 +71,7 @@ pub(crate) fn scan_string(ptr: &mut Ptr) {
             }
             _ => {
                 ptr.bump();
-            },
+            }
         }
     }
 }
@@ -90,7 +90,7 @@ pub(crate) fn scan_raw_string(ptr: &mut Ptr) {
     while let Some(c) = ptr.bump() {
         if c == '"' {
             let mut hashes_left = hashes;
-            while ptr.at('#') && hashes_left > 0{
+            while ptr.at('#') && hashes_left > 0 {
                 hashes_left -= 1;
                 ptr.bump();
             }
diff --git a/crates/ra_syntax/src/lib.rs b/crates/ra_syntax/src/lib.rs
index 7eba5ee614f..7a9718aad4d 100644
--- a/crates/ra_syntax/src/lib.rs
+++ b/crates/ra_syntax/src/lib.rs
@@ -20,11 +20,11 @@
 #![allow(missing_docs)]
 //#![warn(unreachable_pub)] // rust-lang/rust#47816
 
-extern crate itertools;
-extern crate unicode_xid;
 extern crate drop_bomb;
+extern crate itertools;
 extern crate parking_lot;
 extern crate rowan;
+extern crate unicode_xid;
 
 #[cfg(test)]
 #[macro_use]
@@ -35,33 +35,31 @@ pub mod ast;
 mod lexer;
 #[macro_use]
 mod token_set;
-mod parser_api;
 mod grammar;
+mod parser_api;
 mod parser_impl;
 mod reparsing;
 
 mod syntax_kinds;
-mod yellow;
+pub mod text_utils;
 /// Utilities for simple uses of the parser.
 pub mod utils;
-pub mod text_utils;
+mod yellow;
 
 pub use crate::{
-    rowan::{SmolStr, TextRange, TextUnit},
     ast::AstNode,
     lexer::{tokenize, Token},
-    syntax_kinds::SyntaxKind,
-    yellow::{SyntaxNode, SyntaxNodeRef, OwnedRoot, RefRoot, TreeRoot, SyntaxError, Direction},
     reparsing::AtomEdit,
+    rowan::{SmolStr, TextRange, TextUnit},
+    syntax_kinds::SyntaxKind,
+    yellow::{Direction, OwnedRoot, RefRoot, SyntaxError, SyntaxNode, SyntaxNodeRef, TreeRoot},
 };
 
-use crate::{
-    yellow::{GreenNode},
-};
+use crate::yellow::GreenNode;
 
 #[derive(Clone, Debug, Hash, PartialEq, Eq)]
 pub struct File {
-    root: SyntaxNode
+    root: SyntaxNode,
 }
 
 impl File {
@@ -74,21 +72,21 @@ impl File {
     }
     pub fn parse(text: &str) -> File {
         let tokens = tokenize(&text);
-        let (green, errors) = parser_impl::parse_with(
-            yellow::GreenBuilder::new(),
-            text, &tokens, grammar::root,
-        );
+        let (green, errors) =
+            parser_impl::parse_with(yellow::GreenBuilder::new(), text, &tokens, grammar::root);
         File::new(green, errors)
     }
     pub fn reparse(&self, edit: &AtomEdit) -> File {
-        self.incremental_reparse(edit).unwrap_or_else(|| self.full_reparse(edit))
+        self.incremental_reparse(edit)
+            .unwrap_or_else(|| self.full_reparse(edit))
     }
     pub fn incremental_reparse(&self, edit: &AtomEdit) -> Option<File> {
         reparsing::incremental_reparse(self.syntax(), edit, self.errors())
             .map(|(green_node, errors)| File::new(green_node, errors))
     }
     fn full_reparse(&self, edit: &AtomEdit) -> File {
-        let text = text_utils::replace_range(self.syntax().text().to_string(), edit.delete, &edit.insert);
+        let text =
+            text_utils::replace_range(self.syntax().text().to_string(), edit.delete, &edit.insert);
         File::parse(&text)
     }
     pub fn ast(&self) -> ast::Root {
diff --git a/crates/ra_syntax/src/parser_api.rs b/crates/ra_syntax/src/parser_api.rs
index cc23bb75e3a..42046d36fde 100644
--- a/crates/ra_syntax/src/parser_api.rs
+++ b/crates/ra_syntax/src/parser_api.rs
@@ -1,8 +1,8 @@
 use crate::{
-    token_set::TokenSet,
-    parser_impl::ParserImpl,
-    SyntaxKind::{self, ERROR},
     drop_bomb::DropBomb,
+    parser_impl::ParserImpl,
+    token_set::TokenSet,
+    SyntaxKind::{self, ERROR},
 };
 
 /// `Parser` struct provides the low-level API for
@@ -116,9 +116,7 @@ impl<'t> Parser<'t> {
 
     /// Create an error node and consume the next token.
     pub(crate) fn err_recover(&mut self, message: &str, recovery: TokenSet) {
-        if self.at(SyntaxKind::L_CURLY)
-            || self.at(SyntaxKind::R_CURLY)
-            || self.at_ts(recovery) {
+        if self.at(SyntaxKind::L_CURLY) || self.at(SyntaxKind::R_CURLY) || self.at_ts(recovery) {
             self.error(message);
         } else {
             let m = self.start();
diff --git a/crates/ra_syntax/src/parser_impl/event.rs b/crates/ra_syntax/src/parser_impl/event.rs
index 928d2cc7a16..79fa21389d1 100644
--- a/crates/ra_syntax/src/parser_impl/event.rs
+++ b/crates/ra_syntax/src/parser_impl/event.rs
@@ -7,14 +7,14 @@
 //! tree builder: the parser produces a stream of events like
 //! `start node`, `finish node`, and `FileBuilder` converts
 //! this stream to a real tree.
-use std::mem;
 use crate::{
-    TextUnit, TextRange, SmolStr,
     lexer::Token,
     parser_impl::Sink,
+    SmolStr,
     SyntaxKind::{self, *},
+    TextRange, TextUnit,
 };
-
+use std::mem;
 
 /// `Parser` produces a flat list of `Event`s.
 /// They are converted to a tree-structure in
@@ -89,20 +89,28 @@ pub(super) struct EventProcessor<'a, S: Sink> {
 }
 
 impl<'a, S: Sink> EventProcessor<'a, S> {
-    pub(super) fn new(sink: S, text: &'a str, tokens: &'a[Token], events: &'a mut [Event]) -> EventProcessor<'a, S> {
+    pub(super) fn new(
+        sink: S,
+        text: &'a str,
+        tokens: &'a [Token],
+        events: &'a mut [Event],
+    ) -> EventProcessor<'a, S> {
         EventProcessor {
             sink,
             text_pos: 0.into(),
             text,
             token_pos: 0,
             tokens,
-            events
+            events,
         }
     }
 
     pub(super) fn process(mut self) -> S {
         fn tombstone() -> Event {
-            Event::Start { kind: TOMBSTONE, forward_parent: None }
+            Event::Start {
+                kind: TOMBSTONE,
+                forward_parent: None,
+            }
         }
         let mut forward_parents = Vec::new();
 
@@ -112,7 +120,10 @@ impl<'a, S: Sink> EventProcessor<'a, S> {
                     kind: TOMBSTONE, ..
                 } => (),
 
-                Event::Start { kind, forward_parent } => {
+                Event::Start {
+                    kind,
+                    forward_parent,
+                } => {
                     forward_parents.push(kind);
                     let mut idx = i;
                     let mut fp = forward_parent;
@@ -125,7 +136,7 @@ impl<'a, S: Sink> EventProcessor<'a, S> {
                             } => {
                                 forward_parents.push(kind);
                                 forward_parent
-                            },
+                            }
                             _ => unreachable!(),
                         };
                     }
@@ -136,7 +147,7 @@ impl<'a, S: Sink> EventProcessor<'a, S> {
                 Event::Finish => {
                     let last = i == self.events.len() - 1;
                     self.finish(last);
-                },
+                }
                 Event::Token { kind, n_raw_tokens } => {
                     self.eat_ws();
                     let n_raw_tokens = n_raw_tokens as usize;
@@ -162,19 +173,16 @@ impl<'a, S: Sink> EventProcessor<'a, S> {
             .take_while(|it| it.kind.is_trivia())
             .count();
         let leading_trivias = &self.tokens[self.token_pos..self.token_pos + n_trivias];
-        let mut trivia_end = self.text_pos + leading_trivias
-            .iter()
-            .map(|it| it.len)
-            .sum::<TextUnit>();
+        let mut trivia_end =
+            self.text_pos + leading_trivias.iter().map(|it| it.len).sum::<TextUnit>();
 
         let n_attached_trivias = {
-            let leading_trivias = leading_trivias.iter().rev()
-                .map(|it| {
-                    let next_end = trivia_end - it.len;
-                    let range = TextRange::from_to(next_end, trivia_end);
-                    trivia_end = next_end;
-                    (it.kind, &self.text[range])
-                });
+            let leading_trivias = leading_trivias.iter().rev().map(|it| {
+                let next_end = trivia_end - it.len;
+                let range = TextRange::from_to(next_end, trivia_end);
+                trivia_end = next_end;
+                (it.kind, &self.text[range])
+            });
             n_attached_trivias(kind, leading_trivias)
         };
         self.eat_n_trivias(n_trivias - n_attached_trivias);
@@ -215,7 +223,10 @@ impl<'a, S: Sink> EventProcessor<'a, S> {
     }
 }
 
-fn n_attached_trivias<'a>(kind: SyntaxKind, trivias: impl Iterator<Item=(SyntaxKind, &'a str)>) -> usize {
+fn n_attached_trivias<'a>(
+    kind: SyntaxKind,
+    trivias: impl Iterator<Item = (SyntaxKind, &'a str)>,
+) -> usize {
     match kind {
         STRUCT_DEF | ENUM_DEF | FN_DEF | TRAIT_DEF | MODULE => {
             let mut res = 0;
@@ -236,5 +247,4 @@ fn n_attached_trivias<'a>(kind: SyntaxKind, trivias: impl Iterator<Item=(SyntaxK
         }
         _ => 0,
     }
-
 }
diff --git a/crates/ra_syntax/src/parser_impl/mod.rs b/crates/ra_syntax/src/parser_impl/mod.rs
index c2a6448e7ae..2b026d61e4c 100644
--- a/crates/ra_syntax/src/parser_impl/mod.rs
+++ b/crates/ra_syntax/src/parser_impl/mod.rs
@@ -4,13 +4,13 @@ mod input;
 use std::cell::Cell;
 
 use crate::{
-    TextUnit, SmolStr,
     lexer::Token,
     parser_api::Parser,
     parser_impl::{
-        event::{EventProcessor, Event},
+        event::{Event, EventProcessor},
         input::{InputPosition, ParserInput},
     },
+    SmolStr, TextUnit,
 };
 
 use crate::SyntaxKind::{self, EOF, TOMBSTONE};
@@ -86,7 +86,9 @@ impl<'t> ParserImpl<'t> {
         let c2 = self.inp.kind(self.pos + 1);
         let c3 = self.inp.kind(self.pos + 2);
         if self.inp.start(self.pos + 1) == self.inp.start(self.pos) + self.inp.len(self.pos)
-           && self.inp.start(self.pos + 2) == self.inp.start(self.pos + 1) + self.inp.len(self.pos + 1){
+            && self.inp.start(self.pos + 2)
+                == self.inp.start(self.pos + 1) + self.inp.len(self.pos + 1)
+        {
             Some((c1, c2, c3))
         } else {
             None
@@ -138,10 +140,7 @@ impl<'t> ParserImpl<'t> {
 
     fn do_bump(&mut self, kind: SyntaxKind, n_raw_tokens: u8) {
         self.pos += u32::from(n_raw_tokens);
-        self.event(Event::Token {
-            kind,
-            n_raw_tokens,
-        });
+        self.event(Event::Token { kind, n_raw_tokens });
     }
 
     pub(super) fn error(&mut self, msg: String) {
diff --git a/crates/ra_syntax/src/reparsing.rs b/crates/ra_syntax/src/reparsing.rs
index 16272fe8887..a0014e01627 100644
--- a/crates/ra_syntax/src/reparsing.rs
+++ b/crates/ra_syntax/src/reparsing.rs
@@ -1,14 +1,11 @@
 use crate::algo;
 use crate::grammar;
 use crate::lexer::{tokenize, Token};
-use crate::yellow::{self, GreenNode, SyntaxNodeRef, SyntaxError};
-use crate::parser_impl;
 use crate::parser_api::Parser;
-use crate::{
-    TextUnit, TextRange,
-    SyntaxKind::*,
-};
+use crate::parser_impl;
 use crate::text_utils::replace_range;
+use crate::yellow::{self, GreenNode, SyntaxError, SyntaxNodeRef};
+use crate::{SyntaxKind::*, TextRange, TextUnit};
 
 #[derive(Debug, Clone)]
 pub struct AtomEdit {
@@ -18,7 +15,10 @@ pub struct AtomEdit {
 
 impl AtomEdit {
     pub fn replace(range: TextRange, replace_with: String) -> AtomEdit {
-        AtomEdit { delete: range, insert: replace_with }
+        AtomEdit {
+            delete: range,
+            insert: replace_with,
+        }
     }
 
     pub fn delete(range: TextRange) -> AtomEdit {
@@ -48,12 +48,7 @@ fn reparse_leaf<'node>(
 ) -> Option<(SyntaxNodeRef<'node>, GreenNode, Vec<SyntaxError>)> {
     let node = algo::find_covering_node(node, edit.delete);
     match node.kind() {
-        | WHITESPACE
-        | COMMENT
-        | DOC_COMMENT
-        | IDENT
-        | STRING
-        | RAW_STRING => {
+        WHITESPACE | COMMENT | DOC_COMMENT | IDENT | STRING | RAW_STRING => {
             let text = get_text_after_edit(node, &edit);
             let tokens = tokenize(&text);
             let token = match tokens[..] {
@@ -84,10 +79,7 @@ fn reparse_block<'node>(
         return None;
     }
     let (green, new_errors) =
-        parser_impl::parse_with(
-            yellow::GreenBuilder::new(),
-            &text, &tokens, reparser,
-        );
+        parser_impl::parse_with(yellow::GreenBuilder::new(), &text, &tokens, reparser);
     Some((node, green, new_errors))
 }
 
@@ -101,9 +93,7 @@ fn get_text_after_edit(node: SyntaxNodeRef, edit: &AtomEdit) -> String {
 
 fn is_contextual_kw(text: &str) -> bool {
     match text {
-        | "auto"
-        | "default"
-        | "union" => true,
+        "auto" | "default" | "union" => true,
         _ => false,
     }
 }
@@ -113,7 +103,8 @@ fn find_reparsable_node<'node>(
     range: TextRange,
 ) -> Option<(SyntaxNodeRef<'node>, fn(&mut Parser))> {
     let node = algo::find_covering_node(node, range);
-    return node.ancestors()
+    return node
+        .ancestors()
         .filter_map(|node| reparser(node).map(|r| (node, r)))
         .next();
 
@@ -145,17 +136,20 @@ fn find_reparsable_node<'node>(
 fn is_balanced(tokens: &[Token]) -> bool {
     if tokens.len() == 0
         || tokens.first().unwrap().kind != L_CURLY
-        || tokens.last().unwrap().kind != R_CURLY {
+        || tokens.last().unwrap().kind != R_CURLY
+    {
         return false;
     }
     let mut balance = 0usize;
     for t in tokens.iter() {
         match t.kind {
             L_CURLY => balance += 1,
-            R_CURLY => balance = match balance.checked_sub(1) {
-                Some(b) => b,
-                None => return false,
-            },
+            R_CURLY => {
+                balance = match balance.checked_sub(1) {
+                    Some(b) => b,
+                    None => return false,
+                }
+            }
             _ => (),
         }
     }
@@ -191,24 +185,14 @@ fn merge_errors(
 #[cfg(test)]
 mod tests {
     use super::{
-        super::{
-            File,
-            test_utils::extract_range,
-            text_utils::replace_range,
-            utils::dump_tree,
-        },
-        reparse_leaf, reparse_block, AtomEdit, GreenNode, SyntaxError, SyntaxNodeRef,
+        super::{test_utils::extract_range, text_utils::replace_range, utils::dump_tree, File},
+        reparse_block, reparse_leaf, AtomEdit, GreenNode, SyntaxError, SyntaxNodeRef,
     };
 
-    fn do_check<F>(
-        before: &str,
-        replace_with: &str,
-        reparser: F,
-    ) where
-        for<'a> F: Fn(
-            SyntaxNodeRef<'a>,
-            &AtomEdit,
-        ) -> Option<(SyntaxNodeRef<'a>, GreenNode, Vec<SyntaxError>)>
+    fn do_check<F>(before: &str, replace_with: &str, reparser: F)
+    where
+        for<'a> F: Fn(SyntaxNodeRef<'a>, &AtomEdit)
+            -> Option<(SyntaxNodeRef<'a>, GreenNode, Vec<SyntaxError>)>,
     {
         let (range, before) = extract_range(before);
         let after = replace_range(before.clone(), range, replace_with);
@@ -216,7 +200,10 @@ mod tests {
         let fully_reparsed = File::parse(&after);
         let incrementally_reparsed = {
             let f = File::parse(&before);
-            let edit = AtomEdit { delete: range, insert: replace_with.to_string() };
+            let edit = AtomEdit {
+                delete: range,
+                insert: replace_with.to_string(),
+            };
             let (node, green, new_errors) =
                 reparser(f.syntax(), &edit).expect("cannot incrementally reparse");
             let green_root = node.replace_with(green);
@@ -232,113 +219,183 @@ mod tests {
 
     #[test]
     fn reparse_block_tests() {
-        let do_check = |before, replace_to|
-            do_check(before, replace_to, reparse_block);
+        let do_check = |before, replace_to| do_check(before, replace_to, reparse_block);
 
-        do_check(r"
+        do_check(
+            r"
 fn foo() {
     let x = foo + <|>bar<|>
 }
-", "baz");
-        do_check(r"
+",
+            "baz",
+        );
+        do_check(
+            r"
 fn foo() {
     let x = foo<|> + bar<|>
 }
-", "baz");
-        do_check(r"
+",
+            "baz",
+        );
+        do_check(
+            r"
 struct Foo {
     f: foo<|><|>
 }
-", ",\n    g: (),");
-        do_check(r"
+",
+            ",\n    g: (),",
+        );
+        do_check(
+            r"
 fn foo {
     let;
     1 + 1;
     <|>92<|>;
 }
-", "62");
-        do_check(r"
+",
+            "62",
+        );
+        do_check(
+            r"
 mod foo {
     fn <|><|>
 }
-", "bar");
-        do_check(r"
+",
+            "bar",
+        );
+        do_check(
+            r"
 trait Foo {
     type <|>Foo<|>;
 }
-", "Output");
-        do_check(r"
+",
+            "Output",
+        );
+        do_check(
+            r"
 impl IntoIterator<Item=i32> for Foo {
     f<|><|>
 }
-", "n next(");
-        do_check(r"
+",
+            "n next(",
+        );
+        do_check(
+            r"
 use a::b::{foo,<|>,bar<|>};
-    ", "baz");
-        do_check(r"
+    ",
+            "baz",
+        );
+        do_check(
+            r"
 pub enum A {
     Foo<|><|>
 }
-", "\nBar;\n");
-        do_check(r"
+",
+            "\nBar;\n",
+        );
+        do_check(
+            r"
 foo!{a, b<|><|> d}
-", ", c[3]");
-        do_check(r"
+",
+            ", c[3]",
+        );
+        do_check(
+            r"
 fn foo() {
     vec![<|><|>]
 }
-", "123");
-        do_check(r"
+",
+            "123",
+        );
+        do_check(
+            r"
 extern {
     fn<|>;<|>
 }
-", " exit(code: c_int)");
+",
+            " exit(code: c_int)",
+        );
     }
 
     #[test]
     fn reparse_leaf_tests() {
-        let do_check = |before, replace_to|
-            do_check(before, replace_to, reparse_leaf);
+        let do_check = |before, replace_to| do_check(before, replace_to, reparse_leaf);
 
-        do_check(r"<|><|>
+        do_check(
+            r"<|><|>
 fn foo() -> i32 { 1 }
-", "\n\n\n   \n");
-        do_check(r"
+",
+            "\n\n\n   \n",
+        );
+        do_check(
+            r"
 fn foo() -> <|><|> {}
-", "  \n");
-        do_check(r"
+",
+            "  \n",
+        );
+        do_check(
+            r"
 fn <|>foo<|>() -> i32 { 1 }
-", "bar");
-        do_check(r"
+",
+            "bar",
+        );
+        do_check(
+            r"
 fn foo<|><|>foo() {  }
-", "bar");
-        do_check(r"
+",
+            "bar",
+        );
+        do_check(
+            r"
 fn foo /* <|><|> */ () {}
-", "some comment");
-        do_check(r"
+",
+            "some comment",
+        );
+        do_check(
+            r"
 fn baz <|><|> () {}
-", "    \t\t\n\n");
-        do_check(r"
+",
+            "    \t\t\n\n",
+        );
+        do_check(
+            r"
 fn baz <|><|> () {}
-", "    \t\t\n\n");
-        do_check(r"
+",
+            "    \t\t\n\n",
+        );
+        do_check(
+            r"
 /// foo <|><|>omment
 mod { }
-", "c");
-        do_check(r#"
+",
+            "c",
+        );
+        do_check(
+            r#"
 fn -> &str { "Hello<|><|>" }
-"#, ", world");
-        do_check(r#"
+"#,
+            ", world",
+        );
+        do_check(
+            r#"
 fn -> &str { // "Hello<|><|>"
-"#, ", world");
-        do_check(r##"
+"#,
+            ", world",
+        );
+        do_check(
+            r##"
 fn -> &str { r#"Hello<|><|>"#
-"##, ", world");
-        do_check(r"
+"##,
+            ", world",
+        );
+        do_check(
+            r"
 #[derive(<|>Copy<|>)]
 enum Foo {
 
 }
-", "Clone");
+",
+            "Clone",
+        );
     }
 }
diff --git a/crates/ra_syntax/src/syntax_kinds/mod.rs b/crates/ra_syntax/src/syntax_kinds/mod.rs
index 3041e56339a..0fcd07cbfe0 100644
--- a/crates/ra_syntax/src/syntax_kinds/mod.rs
+++ b/crates/ra_syntax/src/syntax_kinds/mod.rs
@@ -1,7 +1,7 @@
 mod generated;
 
-use std::fmt;
 use crate::SyntaxKind::*;
+use std::fmt;
 
 pub use self::generated::SyntaxKind;
 
diff --git a/crates/ra_syntax/src/text_utils.rs b/crates/ra_syntax/src/text_utils.rs
index adf26ef30a5..abda5ec3933 100644
--- a/crates/ra_syntax/src/text_utils.rs
+++ b/crates/ra_syntax/src/text_utils.rs
@@ -23,4 +23,4 @@ pub fn replace_range(mut text: String, range: TextRange, replace_with: &str) ->
     let end = u32::from(range.end()) as usize;
     text.replace_range(start..end, replace_with);
     text
-}
\ No newline at end of file
+}
diff --git a/crates/ra_syntax/src/utils.rs b/crates/ra_syntax/src/utils.rs
index df1f4b37242..27248ff324b 100644
--- a/crates/ra_syntax/src/utils.rs
+++ b/crates/ra_syntax/src/utils.rs
@@ -1,8 +1,8 @@
-use std::fmt::Write;
 use crate::{
     algo::walk::{walk, WalkEvent},
-    SyntaxKind, File, SyntaxNodeRef
+    File, SyntaxKind, SyntaxNodeRef,
 };
+use std::fmt::Write;
 
 /// Parse a file and create a string representation of the resulting parse tree.
 pub fn dump_tree(syntax: SyntaxNodeRef) -> String {
@@ -58,9 +58,7 @@ pub(crate) fn validate_block_structure(root: SyntaxNodeRef) {
     let mut stack = Vec::new();
     for node in root.descendants() {
         match node.kind() {
-            SyntaxKind::L_CURLY => {
-                stack.push(node)
-            }
+            SyntaxKind::L_CURLY => stack.push(node),
             SyntaxKind::R_CURLY => {
                 if let Some(pair) = stack.pop() {
                     assert_eq!(
diff --git a/crates/ra_syntax/src/yellow/builder.rs b/crates/ra_syntax/src/yellow/builder.rs
index 67a1a382b5a..d6405340993 100644
--- a/crates/ra_syntax/src/yellow/builder.rs
+++ b/crates/ra_syntax/src/yellow/builder.rs
@@ -1,10 +1,9 @@
-use rowan::GreenNodeBuilder;
 use crate::{
-    TextUnit, SmolStr,
     parser_impl::Sink,
-    yellow::{GreenNode, SyntaxError, RaTypes},
-    SyntaxKind,
+    yellow::{GreenNode, RaTypes, SyntaxError},
+    SmolStr, SyntaxKind, TextUnit,
 };
+use rowan::GreenNodeBuilder;
 
 pub(crate) struct GreenBuilder {
     errors: Vec<SyntaxError>,
@@ -36,7 +35,10 @@ impl Sink for GreenBuilder {
     }
 
     fn error(&mut self, message: String, offset: TextUnit) {
-        let error = SyntaxError { msg: message, offset };
+        let error = SyntaxError {
+            msg: message,
+            offset,
+        };
         self.errors.push(error)
     }
 
diff --git a/crates/ra_syntax/src/yellow/mod.rs b/crates/ra_syntax/src/yellow/mod.rs
index ab9bca0f020..b5c9da81352 100644
--- a/crates/ra_syntax/src/yellow/mod.rs
+++ b/crates/ra_syntax/src/yellow/mod.rs
@@ -1,16 +1,16 @@
 mod builder;
 mod syntax_text;
 
+use self::syntax_text::SyntaxText;
+use crate::{SmolStr, SyntaxKind, TextRange, TextUnit};
+use rowan::Types;
 use std::{
     fmt,
     hash::{Hash, Hasher},
 };
-use rowan::Types;
-use crate::{SyntaxKind, TextUnit, TextRange, SmolStr};
-use self::syntax_text::SyntaxText;
 
-pub use rowan::{TreeRoot};
 pub(crate) use self::builder::GreenBuilder;
+pub use rowan::TreeRoot;
 
 #[derive(Debug, Clone, Copy)]
 pub enum RaTypes {}
@@ -31,9 +31,7 @@ pub struct SyntaxError {
 }
 
 #[derive(Clone, Copy)]
-pub struct SyntaxNode<R: TreeRoot<RaTypes> = OwnedRoot>(
-    ::rowan::SyntaxNode<RaTypes, R>,
-);
+pub struct SyntaxNode<R: TreeRoot<RaTypes> = OwnedRoot>(::rowan::SyntaxNode<RaTypes, R>);
 pub type SyntaxNodeRef<'a> = SyntaxNode<RefRoot<'a>>;
 
 impl<R1, R2> PartialEq<SyntaxNode<R1>> for SyntaxNode<R2>
@@ -69,16 +67,16 @@ impl<'a> SyntaxNodeRef<'a> {
     pub fn leaf_text(self) -> Option<&'a SmolStr> {
         self.0.leaf_text()
     }
-    pub fn ancestors(self) -> impl Iterator<Item=SyntaxNodeRef<'a>> {
+    pub fn ancestors(self) -> impl Iterator<Item = SyntaxNodeRef<'a>> {
         crate::algo::generate(Some(self), |&node| node.parent())
     }
-    pub fn descendants(self) -> impl Iterator<Item=SyntaxNodeRef<'a>> {
+    pub fn descendants(self) -> impl Iterator<Item = SyntaxNodeRef<'a>> {
         crate::algo::walk::walk(self).filter_map(|event| match event {
             crate::algo::walk::WalkEvent::Enter(node) => Some(node),
             crate::algo::walk::WalkEvent::Exit(_) => None,
         })
     }
-    pub fn siblings(self, direction: Direction) -> impl Iterator<Item=SyntaxNodeRef<'a>> {
+    pub fn siblings(self, direction: Direction) -> impl Iterator<Item = SyntaxNodeRef<'a>> {
         crate::algo::generate(Some(self), move |&node| match direction {
             Direction::Next => node.next_sibling(),
             Direction::Prev => node.prev_sibling(),
@@ -142,9 +140,7 @@ impl<R: TreeRoot<RaTypes>> fmt::Debug for SyntaxNode<R> {
 }
 
 #[derive(Debug)]
-pub struct SyntaxNodeChildren<R: TreeRoot<RaTypes>>(
-    ::rowan::SyntaxNodeChildren<RaTypes, R>
-);
+pub struct SyntaxNodeChildren<R: TreeRoot<RaTypes>>(::rowan::SyntaxNodeChildren<RaTypes, R>);
 
 impl<R: TreeRoot<RaTypes>> Iterator for SyntaxNodeChildren<R> {
     type Item = SyntaxNode<R>;
@@ -154,7 +150,6 @@ impl<R: TreeRoot<RaTypes>> Iterator for SyntaxNodeChildren<R> {
     }
 }
 
-
 fn has_short_text(kind: SyntaxKind) -> bool {
     use crate::SyntaxKind::*;
     match kind {
diff --git a/crates/ra_syntax/src/yellow/syntax_text.rs b/crates/ra_syntax/src/yellow/syntax_text.rs
index ae33b993de0..5395ca90b92 100644
--- a/crates/ra_syntax/src/yellow/syntax_text.rs
+++ b/crates/ra_syntax/src/yellow/syntax_text.rs
@@ -1,10 +1,8 @@
-use std::{
-    fmt, ops,
-};
+use std::{fmt, ops};
 
 use crate::{
+    text_utils::{contains_offset_nonstrict, intersect},
     SyntaxNodeRef, TextRange, TextUnit,
-    text_utils::{intersect, contains_offset_nonstrict},
 };
 
 #[derive(Clone)]
@@ -17,19 +15,17 @@ impl<'a> SyntaxText<'a> {
     pub(crate) fn new(node: SyntaxNodeRef<'a>) -> SyntaxText<'a> {
         SyntaxText {
             node,
-            range: node.range()
+            range: node.range(),
         }
     }
-    pub fn chunks(&self) -> impl Iterator<Item=&'a str> {
+    pub fn chunks(&self) -> impl Iterator<Item = &'a str> {
         let range = self.range;
-        self.node
-            .descendants()
-            .filter_map(move |node| {
-                let text = node.leaf_text()?;
-                let range = intersect(range, node.range())?;
-                let range = range - node.range().start();
-                Some(&text[range])
-            })
+        self.node.descendants().filter_map(move |node| {
+            let text = node.leaf_text()?;
+            let range = intersect(range, node.range())?;
+            let range = range - node.range().start();
+            Some(&text[range])
+        })
     }
     pub fn push_to(&self, buf: &mut String) {
         self.chunks().for_each(|it| buf.push_str(it));
@@ -55,11 +51,13 @@ impl<'a> SyntaxText<'a> {
         self.range.len()
     }
     pub fn slice(&self, range: impl SyntaxTextSlice) -> SyntaxText<'a> {
-        let range = range.restrict(self.range)
-            .unwrap_or_else(|| {
-                panic!("invalid slice, range: {:?}, slice: {:?}", self.range, range)
-            });
-        SyntaxText { node: self.node, range }
+        let range = range.restrict(self.range).unwrap_or_else(|| {
+            panic!("invalid slice, range: {:?}, slice: {:?}", self.range, range)
+        });
+        SyntaxText {
+            node: self.node,
+            range,
+        }
     }
     pub fn char_at(&self, offset: TextUnit) -> Option<char> {
         let mut start: TextUnit = 0.into();
diff --git a/crates/ra_syntax/tests/test.rs b/crates/ra_syntax/tests/test.rs
index 27380efefd6..9d1ded093b8 100644
--- a/crates/ra_syntax/tests/test.rs
+++ b/crates/ra_syntax/tests/test.rs
@@ -4,14 +4,14 @@ extern crate test_utils;
 extern crate walkdir;
 
 use std::{
+    fmt::Write,
     fs,
     path::{Path, PathBuf},
-    fmt::Write,
 };
 
 use ra_syntax::{
+    utils::{check_fuzz_invariants, dump_tree},
     File,
-    utils::{dump_tree, check_fuzz_invariants},
 };
 
 #[test]
@@ -37,7 +37,6 @@ fn parser_fuzz_tests() {
     }
 }
 
-
 /// Read file and normalize newlines.
 ///
 /// `rustc` seems to always normalize `\r\n` newlines to `\n`:
@@ -54,8 +53,8 @@ fn read_text(path: &Path) -> String {
 }
 
 pub fn dir_tests<F>(paths: &[&str], f: F)
-    where
-        F: Fn(&str) -> String,
+where
+    F: Fn(&str) -> String,
 {
     for (path, input_code) in collect_tests(paths) {
         let parse_tree = f(&input_code);
diff --git a/crates/test_utils/src/lib.rs b/crates/test_utils/src/lib.rs
index ee73153f02f..dbe2997eba8 100644
--- a/crates/test_utils/src/lib.rs
+++ b/crates/test_utils/src/lib.rs
@@ -2,9 +2,9 @@ extern crate difference;
 extern crate itertools;
 extern crate text_unit;
 
-use std::fmt;
 use itertools::Itertools;
-use text_unit::{TextUnit, TextRange};
+use std::fmt;
+use text_unit::{TextRange, TextUnit};
 
 pub use self::difference::Changeset as __Changeset;
 
diff --git a/crates/tools/src/lib.rs b/crates/tools/src/lib.rs
index 9a1b12a1644..5d5d372bb85 100644
--- a/crates/tools/src/lib.rs
+++ b/crates/tools/src/lib.rs
@@ -1,17 +1,17 @@
 extern crate itertools;
 #[macro_use]
 extern crate failure;
+extern crate heck;
 extern crate ron;
 extern crate tera;
-extern crate heck;
 
+use heck::{CamelCase, ShoutySnakeCase, SnakeCase};
+use itertools::Itertools;
 use std::{
     collections::HashMap,
     fs,
     path::{Path, PathBuf},
 };
-use itertools::Itertools;
-use heck::{CamelCase, ShoutySnakeCase, SnakeCase};
 
 pub type Result<T> = ::std::result::Result<T, failure::Error>;
 
@@ -61,7 +61,6 @@ pub fn collect_tests(s: &str) -> Vec<(usize, Test)> {
     res
 }
 
-
 pub fn update(path: &Path, contents: &str, verify: bool) -> Result<()> {
     match fs::read_to_string(path) {
         Ok(ref old_contents) if old_contents == contents => {
@@ -116,5 +115,8 @@ pub fn render_template(template: &Path) -> Result<String> {
 }
 
 pub fn project_root() -> PathBuf {
-    Path::new(&std::env::var("CARGO_MANIFEST_DIR").unwrap()).parent().unwrap().to_path_buf()
+    Path::new(&std::env::var("CARGO_MANIFEST_DIR").unwrap())
+        .parent()
+        .unwrap()
+        .to_path_buf()
 }
diff --git a/crates/tools/src/main.rs b/crates/tools/src/main.rs
index 6eacfc190c4..b662d78df81 100644
--- a/crates/tools/src/main.rs
+++ b/crates/tools/src/main.rs
@@ -11,7 +11,10 @@ use std::{
     path::{Path, PathBuf},
     process::Command,
 };
-use tools::{AST, AST_TEMPLATE, Result, SYNTAX_KINDS, SYNTAX_KINDS_TEMPLATE, Test, collect_tests, render_template, update, project_root};
+use tools::{
+    collect_tests, project_root, render_template, update, Result, Test, AST, AST_TEMPLATE,
+    SYNTAX_KINDS, SYNTAX_KINDS_TEMPLATE,
+};
 
 const GRAMMAR_DIR: &str = "./crates/ra_syntax/src/grammar";
 const INLINE_TESTS_DIR: &str = "./crates/ra_syntax/tests/data/parser/inline";
@@ -40,18 +43,23 @@ fn main() -> Result<()> {
 fn run_gen_command(name: &str, verify: bool) -> Result<()> {
     match name {
         "gen-kinds" => {
-            update(&project_root().join(SYNTAX_KINDS), &render_template(&project_root().join(SYNTAX_KINDS_TEMPLATE))?, verify)?;
-            update(&project_root().join(AST), &render_template(&project_root().join(AST_TEMPLATE))?, verify)?;
-        },
-        "gen-tests" => {
-            gen_tests(verify)?
-        },
+            update(
+                &project_root().join(SYNTAX_KINDS),
+                &render_template(&project_root().join(SYNTAX_KINDS_TEMPLATE))?,
+                verify,
+            )?;
+            update(
+                &project_root().join(AST),
+                &render_template(&project_root().join(AST_TEMPLATE))?,
+                verify,
+            )?;
+        }
+        "gen-tests" => gen_tests(verify)?,
         _ => unreachable!(),
     }
     Ok(())
 }
 
-
 fn gen_tests(verify: bool) -> Result<()> {
     let tests = tests_from_dir(Path::new(GRAMMAR_DIR))?;
 
@@ -133,11 +141,20 @@ fn install_code_extension() -> Result<()> {
     } else {
         run(r"npm install", "./editors/code")?;
     }
-    run(r"node ./node_modules/vsce/out/vsce package", "./editors/code")?;
+    run(
+        r"node ./node_modules/vsce/out/vsce package",
+        "./editors/code",
+    )?;
     if cfg!(windows) {
-        run(r"cmd.exe /c code.cmd --install-extension ./ra-lsp-0.0.1.vsix", "./editors/code")?;
+        run(
+            r"cmd.exe /c code.cmd --install-extension ./ra-lsp-0.0.1.vsix",
+            "./editors/code",
+        )?;
     } else {
-        run(r"code --install-extension ./ra-lsp-0.0.1.vsix", "./editors/code")?;
+        run(
+            r"code --install-extension ./ra-lsp-0.0.1.vsix",
+            "./editors/code",
+        )?;
     }
     Ok(())
 }
@@ -145,7 +162,11 @@ fn install_code_extension() -> Result<()> {
 fn run(cmdline: &'static str, dir: &str) -> Result<()> {
     eprintln!("\nwill run: {}", cmdline);
     let manifest_dir = env!("CARGO_MANIFEST_DIR");
-    let project_dir = Path::new(manifest_dir).ancestors().nth(2).unwrap().join(dir);
+    let project_dir = Path::new(manifest_dir)
+        .ancestors()
+        .nth(2)
+        .unwrap()
+        .join(dir);
     let mut args = cmdline.split_whitespace();
     let exec = args.next().unwrap();
     let status = Command::new(exec)
diff --git a/crates/tools/tests/cli.rs b/crates/tools/tests/cli.rs
index f507d80a291..16899bb5f43 100644
--- a/crates/tools/tests/cli.rs
+++ b/crates/tools/tests/cli.rs
@@ -1,13 +1,23 @@
 extern crate tools;
 
-use tools::{AST, AST_TEMPLATE, SYNTAX_KINDS, SYNTAX_KINDS_TEMPLATE, render_template, update, project_root};
+use tools::{
+    project_root, render_template, update, AST, AST_TEMPLATE, SYNTAX_KINDS, SYNTAX_KINDS_TEMPLATE,
+};
 
 #[test]
 fn verify_template_generation() {
-    if let Err(error) = update(&project_root().join(SYNTAX_KINDS), &render_template(&project_root().join(SYNTAX_KINDS_TEMPLATE)).unwrap(), true) {
+    if let Err(error) = update(
+        &project_root().join(SYNTAX_KINDS),
+        &render_template(&project_root().join(SYNTAX_KINDS_TEMPLATE)).unwrap(),
+        true,
+    ) {
         panic!("{}. Please update it by running `cargo gen-kinds`", error);
     }
-    if let Err(error) = update(&project_root().join(AST), &render_template(&project_root().join(AST_TEMPLATE)).unwrap(), true) {
+    if let Err(error) = update(
+        &project_root().join(AST),
+        &render_template(&project_root().join(AST_TEMPLATE)).unwrap(),
+        true,
+    ) {
         panic!("{}. Please update it by running `cargo gen-kinds`", error);
     }
 }