Rollup merge of #21626 - Ms2ger:various-cleanup, r=eddyb

src/librustc/metadata/csearch.rs

@@ -10,10 +10,6 @@
 
 // Searching for information from the cstore
 
-#![allow(non_camel_case_types)]
-
-pub use self::found_ast::*;
-
 use metadata::common::*;
 use metadata::cstore;
 use metadata::decoder;
@@ -101,10 +97,10 @@ pub fn get_item_path(tcx: &ty::ctxt, def: ast::DefId) -> Vec<ast_map::PathElem>
     r
 }
 
-pub enum found_ast<'ast> {
-    found(&'ast ast::InlinedItem),
-    found_parent(ast::DefId, &'ast ast::InlinedItem),
-    not_found,
+pub enum FoundAst<'ast> {
+    Found(&'ast ast::InlinedItem),
+    FoundParent(ast::DefId, &'ast ast::InlinedItem),
+    NotFound,
 }
 
 // Finds the AST for this item in the crate metadata, if any.  If the item was
@@ -112,7 +108,7 @@ pub enum found_ast<'ast> {
 // will be returned.
 pub fn maybe_get_item_ast<'tcx>(tcx: &ty::ctxt<'tcx>, def: ast::DefId,
                                 decode_inlined_item: decoder::DecodeInlinedItem)
-                                -> found_ast<'tcx> {
+                                -> FoundAst<'tcx> {
     let cstore = &tcx.sess.cstore;
     let cdata = cstore.get_crate_data(def.krate);
     decoder::maybe_get_item_ast(&*cdata, tcx, def.node, decode_inlined_item)

src/librustc/metadata/decoder.rs

@@ -693,23 +693,23 @@ pub type DecodeInlinedItem<'a> =
 
 pub fn maybe_get_item_ast<'tcx>(cdata: Cmd, tcx: &ty::ctxt<'tcx>, id: ast::NodeId,
                                 mut decode_inlined_item: DecodeInlinedItem)
-                                -> csearch::found_ast<'tcx> {
+                                -> csearch::FoundAst<'tcx> {
     debug!("Looking up item: {}", id);
     let item_doc = lookup_item(id, cdata.data());
     let path = item_path(item_doc).init().to_vec();
     match decode_inlined_item(cdata, tcx, path, item_doc) {
-        Ok(ii) => csearch::found(ii),
+        Ok(ii) => csearch::FoundAst::Found(ii),
         Err(path) => {
             match item_parent_item(item_doc) {
                 Some(did) => {
                     let did = translate_def_id(cdata, did);
                     let parent_item = lookup_item(did.node, cdata.data());
                     match decode_inlined_item(cdata, tcx, path, parent_item) {
-                        Ok(ii) => csearch::found_parent(did, ii),
-                        Err(_) => csearch::not_found
+                        Ok(ii) => csearch::FoundAst::FoundParent(did, ii),
+                        Err(_) => csearch::FoundAst::NotFound
                     }
                 }
-                None => csearch::not_found
+                None => csearch::FoundAst::NotFound
             }
         }
     }

src/librustc/metadata/encoder.rs

@@ -1577,7 +1577,7 @@ fn encode_info_for_items(ecx: &EncodeContext,
                         &krate.module,
                         &[],
                         ast::CRATE_NODE_ID,
-                        ast_map::Values([].iter()).chain(None),
+                        [].iter().cloned().chain(None),
                         syntax::parse::token::special_idents::invalid,
                         ast::Public);
 
@@ -1949,7 +1949,7 @@ fn encode_misc_info(ecx: &EncodeContext,
     }
 
     // Encode reexports for the root module.
-    encode_reexports(ecx, rbml_w, 0, ast_map::Values([].iter()).chain(None));
+    encode_reexports(ecx, rbml_w, 0, [].iter().cloned().chain(None));
 
     rbml_w.end_tag();
     rbml_w.end_tag();

src/librustc/middle/astencode.rs

@@ -130,7 +130,7 @@ pub fn decode_inlined_item<'tcx>(cdata: &cstore::crate_metadata,
         debug!("> Decoding inlined fn: {:?}::?",
         {
             // Do an Option dance to use the path after it is moved below.
-            let s = ast_map::path_to_string(ast_map::Values(path.iter()));
+            let s = ast_map::path_to_string(path.iter().cloned());
             path_as_str = Some(s);
             path_as_str.as_ref().map(|x| &x[])
         });

src/librustc/middle/const_eval.rs

@@ -133,7 +133,7 @@ fn lookup_variant_by_id<'a>(tcx: &'a ty::ctxt,
         }
         let expr_id = match csearch::maybe_get_item_ast(tcx, enum_def,
             box |a, b, c, d| astencode::decode_inlined_item(a, b, c, d)) {
-            csearch::found(&ast::IIItem(ref item)) => match item.node {
+            csearch::FoundAst::Found(&ast::IIItem(ref item)) => match item.node {
                 ast::ItemEnum(ast::EnumDef { ref variants }, _) => {
                     // NOTE this doesn't do the right thing, it compares inlined
                     // NodeId's to the original variant_def's NodeId, but they
@@ -173,7 +173,7 @@ pub fn lookup_const_by_id<'a>(tcx: &'a ty::ctxt, def_id: ast::DefId)
         }
         let expr_id = match csearch::maybe_get_item_ast(tcx, def_id,
             box |a, b, c, d| astencode::decode_inlined_item(a, b, c, d)) {
-            csearch::found(&ast::IIItem(ref item)) => match item.node {
+            csearch::FoundAst::Found(&ast::IIItem(ref item)) => match item.node {
                 ast::ItemConst(_, ref const_expr) => Some(const_expr.id),
                 _ => None
             },

src/librustc/middle/ty.rs

@@ -5264,7 +5264,7 @@ pub fn with_path<T, F>(cx: &ctxt, id: ast::DefId, f: F) -> T where
     if id.krate == ast::LOCAL_CRATE {
         cx.map.with_path(id.node, f)
     } else {
-        f(ast_map::Values(csearch::get_item_path(cx, id).iter()).chain(None))
+        f(csearch::get_item_path(cx, id).iter().cloned().chain(None))
     }
 }
 

src/librustc_trans/back/link.rs

@@ -37,7 +37,6 @@ use flate;
 use serialize::hex::ToHex;
 use syntax::ast;
 use syntax::ast_map::{PathElem, PathElems, PathName};
-use syntax::ast_map;
 use syntax::attr::AttrMetaMethods;
 use syntax::codemap::Span;
 use syntax::parse::token;
@@ -339,7 +338,7 @@ pub fn mangle_internal_name_by_type_and_seq<'a, 'tcx>(ccx: &CrateContext<'a, 'tc
     let path = [PathName(token::intern(&s[])),
                 gensym_name(name)];
     let hash = get_symbol_hash(ccx, t);
-    mangle(ast_map::Values(path.iter()), Some(&hash[]))
+    mangle(path.iter().cloned(), Some(&hash[]))
 }
 
 pub fn mangle_internal_name_by_path_and_seq(path: PathElems, flav: &str) -> String {

src/librustc_trans/trans/inline.rs

@@ -43,11 +43,11 @@ fn instantiate_inline(ccx: &CrateContext, fn_id: ast::DefId)
             box |a,b,c,d| astencode::decode_inlined_item(a, b, c, d));
 
     let inline_def = match csearch_result {
-        csearch::not_found => {
+        csearch::FoundAst::NotFound => {
             ccx.external().borrow_mut().insert(fn_id, None);
             return None;
         }
-        csearch::found(&ast::IIItem(ref item)) => {
+        csearch::FoundAst::Found(&ast::IIItem(ref item)) => {
             ccx.external().borrow_mut().insert(fn_id, Some(item.id));
             ccx.external_srcs().borrow_mut().insert(item.id, fn_id);
 
@@ -90,12 +90,12 @@ fn instantiate_inline(ccx: &CrateContext, fn_id: ast::DefId)
 
             local_def(item.id)
         }
-        csearch::found(&ast::IIForeign(ref item)) => {
+        csearch::FoundAst::Found(&ast::IIForeign(ref item)) => {
             ccx.external().borrow_mut().insert(fn_id, Some(item.id));
             ccx.external_srcs().borrow_mut().insert(item.id, fn_id);
             local_def(item.id)
         }
-        csearch::found_parent(parent_id, &ast::IIItem(ref item)) => {
+        csearch::FoundAst::FoundParent(parent_id, &ast::IIItem(ref item)) => {
             ccx.external().borrow_mut().insert(parent_id, Some(item.id));
             ccx.external_srcs().borrow_mut().insert(item.id, parent_id);
 
@@ -124,11 +124,11 @@ fn instantiate_inline(ccx: &CrateContext, fn_id: ast::DefId)
           trans_item(ccx, &**item);
           local_def(my_id)
         }
-        csearch::found_parent(_, _) => {
-            ccx.sess().bug("maybe_get_item_ast returned a found_parent \
+        csearch::FoundAst::FoundParent(_, _) => {
+            ccx.sess().bug("maybe_get_item_ast returned a FoundParent \
              with a non-item parent");
         }
-        csearch::found(&ast::IITraitItem(_, ref trait_item)) => {
+        csearch::FoundAst::Found(&ast::IITraitItem(_, ref trait_item)) => {
             match *trait_item {
                 ast::RequiredMethod(_) => ccx.sess().bug("found RequiredMethod IITraitItem"),
                 ast::ProvidedMethod(ref mth) => {
@@ -147,7 +147,7 @@ fn instantiate_inline(ccx: &CrateContext, fn_id: ast::DefId)
                 }
             }
         }
-        csearch::found(&ast::IIImplItem(impl_did, ref impl_item)) => {
+        csearch::FoundAst::Found(&ast::IIImplItem(impl_did, ref impl_item)) => {
             match *impl_item {
                 ast::MethodImplItem(ref mth) => {
                     ccx.external().borrow_mut().insert(fn_id, Some(mth.id));

src/libsyntax/ast_map/mod.rs

@@ -75,21 +75,8 @@ impl<'a> Iterator for LinkedPath<'a> {
     }
 }
 
-// HACK(eddyb) move this into libstd (value wrapper for slice::Iter).
-#[derive(Clone)]
-pub struct Values<'a, T:'a>(pub slice::Iter<'a, T>);
-
-impl<'a, T: Copy> Iterator for Values<'a, T> {
-    type Item = T;
-
-    fn next(&mut self) -> Option<T> {
-        let &mut Values(ref mut items) = self;
-        items.next().map(|&x| x)
-    }
-}
-
 /// The type of the iterator used by with_path.
-pub type PathElems<'a, 'b> = iter::Chain<Values<'a, PathElem>, LinkedPath<'b>>;
+pub type PathElems<'a, 'b> = iter::Chain<iter::Cloned<slice::Iter<'a, PathElem>>, LinkedPath<'b>>;
 
 pub fn path_to_string<PI: Iterator<Item=PathElem>>(path: PI) -> String {
     let itr = token::get_ident_interner();
@@ -101,7 +88,7 @@ pub fn path_to_string<PI: Iterator<Item=PathElem>>(path: PI) -> String {
         }
         s.push_str(&e[]);
         s
-    }).to_string()
+    })
 }
 
 #[derive(Copy, Show)]
@@ -458,9 +445,9 @@ impl<'ast> Map<'ast> {
         if parent == id {
             match self.find_entry(id) {
                 Some(RootInlinedParent(data)) => {
-                    f(Values(data.path.iter()).chain(next))
+                    f(data.path.iter().cloned().chain(next))
                 }
-                _ => f(Values([].iter()).chain(next))
+                _ => f([].iter().cloned().chain(next))
             }
         } else {
             self.with_path_next(parent, Some(&LinkedPathNode {

src/libsyntax/ast_util.rs

@@ -670,20 +670,13 @@ pub fn path_name_eq(a : &ast::Path, b : &ast::Path) -> bool {
 
 // are two arrays of segments equal when compared unhygienically?
 pub fn segments_name_eq(a : &[ast::PathSegment], b : &[ast::PathSegment]) -> bool {
-    if a.len() != b.len() {
-        false
-    } else {
-        for (idx,seg) in a.iter().enumerate() {
-            if seg.identifier.name != b[idx].identifier.name
-                // FIXME #7743: ident -> name problems in lifetime comparison?
-                // can types contain idents?
-                || seg.parameters != b[idx].parameters
-            {
-                return false;
-            }
-        }
-        true
-    }
+    a.len() == b.len() &&
+    a.iter().zip(b.iter()).all(|(s, t)| {
+        s.identifier.name == t.identifier.name &&
+        // FIXME #7743: ident -> name problems in lifetime comparison?
+        // can types contain idents?
+        s.parameters == t.parameters
+    })
 }
 
 /// Returns true if this literal is a string and false otherwise.