Upgrade from our standard lints v4 -> v6 (#861)

.cargo/config

@@ -1,2 +1,85 @@
 [alias]
 compiletest = "run --release -p compiletests --"
+
+[target.'cfg(all())']
+rustflags = [
+    # BEGIN - Embark standard lints v6 for Rust 1.55+
+    # do not change or add/remove here, but one can add exceptions after this section
+    # for more info see: <https://github.com/EmbarkStudios/rust-ecosystem/issues/59>
+    "-Dunsafe_code",
+    "-Wclippy::all",
+    "-Wclippy::await_holding_lock",
+    "-Wclippy::char_lit_as_u8",
+    "-Wclippy::checked_conversions",
+    "-Wclippy::dbg_macro",
+    "-Wclippy::debug_assert_with_mut_call",
+    "-Wclippy::doc_markdown",
+    "-Wclippy::empty_enum",
+    "-Wclippy::enum_glob_use",
+    "-Wclippy::exit",
+    "-Wclippy::expl_impl_clone_on_copy",
+    "-Wclippy::explicit_deref_methods",
+    "-Wclippy::explicit_into_iter_loop",
+    "-Wclippy::fallible_impl_from",
+    "-Wclippy::filter_map_next",
+    "-Wclippy::flat_map_option",
+    "-Wclippy::float_cmp_const",
+    "-Wclippy::fn_params_excessive_bools",
+    "-Wclippy::from_iter_instead_of_collect",
+    "-Wclippy::if_let_mutex",
+    "-Wclippy::implicit_clone",
+    "-Wclippy::imprecise_flops",
+    "-Wclippy::inefficient_to_string",
+    "-Wclippy::invalid_upcast_comparisons",
+    "-Wclippy::large_digit_groups",
+    "-Wclippy::large_stack_arrays",
+    "-Wclippy::large_types_passed_by_value",
+    "-Wclippy::let_unit_value",
+    "-Wclippy::linkedlist",
+    "-Wclippy::lossy_float_literal",
+    "-Wclippy::macro_use_imports",
+    "-Wclippy::manual_ok_or",
+    "-Wclippy::map_err_ignore",
+    "-Wclippy::map_flatten",
+    "-Wclippy::map_unwrap_or",
+    "-Wclippy::match_on_vec_items",
+    "-Wclippy::match_same_arms",
+    "-Wclippy::match_wild_err_arm",
+    "-Wclippy::match_wildcard_for_single_variants",
+    "-Wclippy::mem_forget",
+    "-Wclippy::mismatched_target_os",
+    "-Wclippy::missing_enforced_import_renames",
+    "-Wclippy::mut_mut",
+    "-Wclippy::mutex_integer",
+    "-Wclippy::needless_borrow",
+    "-Wclippy::needless_continue",
+    "-Wclippy::needless_for_each",
+    "-Wclippy::option_option",
+    "-Wclippy::path_buf_push_overwrite",
+    "-Wclippy::ptr_as_ptr",
+    "-Wclippy::rc_mutex",
+    "-Wclippy::ref_option_ref",
+    "-Wclippy::rest_pat_in_fully_bound_structs",
+    "-Wclippy::same_functions_in_if_condition",
+    "-Wclippy::semicolon_if_nothing_returned",
+    "-Wclippy::single_match_else",
+    "-Wclippy::string_add_assign",
+    "-Wclippy::string_add",
+    "-Wclippy::string_lit_as_bytes",
+    "-Wclippy::string_to_string",
+    "-Wclippy::todo",
+    "-Wclippy::trait_duplication_in_bounds",
+    "-Wclippy::unimplemented",
+    "-Wclippy::unnested_or_patterns",
+    "-Wclippy::unused_self",
+    "-Wclippy::useless_transmute",
+    "-Wclippy::verbose_file_reads",
+    "-Wclippy::zero_sized_map_values",
+    "-Wfuture_incompatible",
+    "-Wnonstandard_style",
+    "-Wrust_2018_idioms",
+    # END - Embark standard lints v6 for Rust 1.55+
+
+    # repo specific lints
+    "-Aunsafe_code",
+]

crates/rustc_codegen_spirv-types/src/compile_result.rs

@@ -72,7 +72,7 @@ impl<'a> Trie<'a> {
         children.sort_unstable_by(|(k1, _), (k2, _)| k1.cmp(k2));
         for (child_name, child) in children {
             let full_child_name = if full_name.is_empty() {
-                child_name.to_string()
+                (*child_name).to_string()
             } else {
                 format!("{}::{}", full_name, child_name)
             };

crates/rustc_codegen_spirv/src/builder/builder_methods.rs

@@ -2134,18 +2134,15 @@ impl<'a, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'tcx> {
                     return_type,
                     arguments,
                 } => (
-                    match callee.kind {
-                        SpirvValueKind::FnAddr { function } => {
+                    if let SpirvValueKind::FnAddr { function } = callee.kind {
                         assert_ty_eq!(self, callee_ty, pointee);
                         function
                     }
-
                     // Truly indirect call.
-                        _ => {
+                    else {
                         let fn_ptr_val = callee.def(self);
                         self.zombie(fn_ptr_val, "indirect calls are not supported in SPIR-V");
                         fn_ptr_val
-                        }
                     },
                     return_type,
                     arguments,

crates/rustc_codegen_spirv/src/builder/ext_inst.rs

@@ -14,15 +14,14 @@ pub struct ExtInst {
 
 impl ExtInst {
     pub fn import_glsl<'a, 'tcx>(&mut self, bx: &Builder<'a, 'tcx>) -> Word {
-        match self.glsl {
-            Some(id) => id,
-            None => {
+        if let Some(id) = self.glsl {
+            id
+        } else {
             let id = bx.emit_global().ext_inst_import(GLSL_STD_450);
             self.glsl = Some(id);
             id
         }
     }
-    }
 
     pub fn require_integer_functions_2_intel<'a, 'tcx>(
         &mut self,

crates/rustc_codegen_spirv/src/builder/spirv_asm.rs

@@ -427,19 +427,16 @@ impl<'cx, 'tcx> Builder<'cx, 'tcx> {
                 Some(result_id) => result_id,
                 None => return,
             };
-            match tokens.next() {
-                Some(Token::Word("=")) => (),
-                _ => {
+            if let Some(Token::Word("=")) = tokens.next() {
+            } else {
                 self.err("expected equals after result id specifier");
                 return;
             }
-            }
-            first_token = match tokens.next() {
-                Some(tok) => tok,
-                None => {
+            first_token = if let Some(tok) = tokens.next() {
+                tok
+            } else {
                 self.err("expected instruction after equals");
                 return;
-                }
             };
             Some(result_id)
         } else {
@@ -461,12 +458,11 @@ impl<'cx, 'tcx> Builder<'cx, 'tcx> {
         let inst_class = inst_name
             .strip_prefix("Op")
             .and_then(|n| self.instruction_table.table.get(n));
-        let inst_class = match inst_class {
-            Some(inst) => inst,
-            None => {
+        let inst_class = if let Some(inst) = inst_class {
+            inst
+        } else {
             self.err(&format!("unknown spirv instruction {}", inst_name));
             return;
-            }
         };
         let result_id = match out_register {
             Some(OutRegister::Regular(reg)) => Some(reg),
@@ -808,19 +804,20 @@ impl<'cx, 'tcx> Builder<'cx, 'tcx> {
         token: Token<'a, 'cx, 'tcx>,
     ) -> Option<OutRegister<'a>> {
         match token {
-            Token::Word(word) => match word.strip_prefix('%') {
-                Some(id) => Some(OutRegister::Regular({
+            Token::Word(word) => {
+                if let Some(id) = word.strip_prefix('%') {
+                    Some(OutRegister::Regular({
                         let num = *id_map.entry(id).or_insert_with(|| self.emit().id());
                         if !defined_ids.insert(num) {
                             self.err(&format!("%{} is defined more than once", id));
                         }
                         num
-                })),
-                None => {
+                    }))
+                } else {
                     self.err("expected ID");
                     None
                 }
-            },
+            }
             Token::String(_) => {
                 self.err("expected ID, not string");
                 None
@@ -896,13 +893,14 @@ impl<'cx, 'tcx> Builder<'cx, 'tcx> {
         token: Token<'a, 'cx, 'tcx>,
     ) -> Option<Word> {
         match token {
-            Token::Word(word) => match word.strip_prefix('%') {
-                Some(id) => Some(*id_map.entry(id).or_insert_with(|| self.emit().id())),
-                None => {
+            Token::Word(word) => {
+                if let Some(id) = word.strip_prefix('%') {
+                    Some(*id_map.entry(id).or_insert_with(|| self.emit().id()))
+                } else {
                     self.err("expected ID");
                     None
                 }
-            },
+            }
             Token::String(_) => {
                 self.err("expected ID, not string");
                 None

crates/rustc_codegen_spirv/src/codegen_cx/entry.rs

@@ -33,14 +33,13 @@ impl<'tcx> CodegenCx<'tcx> {
     ) {
         let span = self.tcx.def_span(instance.def_id());
         let hir_params = {
-            let fn_local_def_id = match instance.def_id().as_local() {
-                Some(id) => id,
-                None => {
+            let fn_local_def_id = if let Some(id) = instance.def_id().as_local() {
+                id
+            } else {
                 self.tcx
                     .sess
                     .span_err(span, &format!("Cannot declare {} as an entry point", name));
                 return;
-                }
             };
             let fn_hir_id = self.tcx.hir().local_def_id_to_hir_id(fn_local_def_id);
             let body = self.tcx.hir().body(self.tcx.hir().body_owned_by(fn_hir_id));

crates/rustc_codegen_spirv/src/lib.rs

@@ -18,75 +18,6 @@
 #![feature(rustc_private)]
 #![feature(assert_matches)]
 #![feature(once_cell)]
-// BEGIN - Embark standard lints v0.4
-// do not change or add/remove here, but one can add exceptions after this section
-// for more info see: <https://github.com/EmbarkStudios/rust-ecosystem/issues/59>
-#![deny(unsafe_code)]
-#![warn(
-    clippy::all,
-    clippy::await_holding_lock,
-    clippy::char_lit_as_u8,
-    clippy::checked_conversions,
-    clippy::dbg_macro,
-    clippy::debug_assert_with_mut_call,
-    clippy::doc_markdown,
-    clippy::empty_enum,
-    clippy::enum_glob_use,
-    clippy::exit,
-    clippy::expl_impl_clone_on_copy,
-    clippy::explicit_deref_methods,
-    clippy::explicit_into_iter_loop,
-    clippy::fallible_impl_from,
-    clippy::filter_map_next,
-    clippy::float_cmp_const,
-    clippy::fn_params_excessive_bools,
-    clippy::if_let_mutex,
-    clippy::implicit_clone,
-    clippy::imprecise_flops,
-    clippy::inefficient_to_string,
-    clippy::invalid_upcast_comparisons,
-    clippy::large_types_passed_by_value,
-    clippy::let_unit_value,
-    clippy::linkedlist,
-    clippy::lossy_float_literal,
-    clippy::macro_use_imports,
-    clippy::manual_ok_or,
-    clippy::map_err_ignore,
-    clippy::map_flatten,
-    clippy::map_unwrap_or,
-    clippy::match_on_vec_items,
-    clippy::match_same_arms,
-    clippy::match_wildcard_for_single_variants,
-    clippy::mem_forget,
-    clippy::mismatched_target_os,
-    clippy::mut_mut,
-    clippy::mutex_integer,
-    clippy::needless_borrow,
-    clippy::needless_continue,
-    clippy::option_option,
-    clippy::path_buf_push_overwrite,
-    clippy::ptr_as_ptr,
-    clippy::ref_option_ref,
-    clippy::rest_pat_in_fully_bound_structs,
-    clippy::same_functions_in_if_condition,
-    clippy::semicolon_if_nothing_returned,
-    clippy::string_add_assign,
-    clippy::string_add,
-    clippy::string_lit_as_bytes,
-    clippy::string_to_string,
-    clippy::todo,
-    clippy::trait_duplication_in_bounds,
-    clippy::unimplemented,
-    clippy::unnested_or_patterns,
-    clippy::unused_self,
-    clippy::useless_transmute,
-    clippy::verbose_file_reads,
-    clippy::zero_sized_map_values,
-    future_incompatible,
-    nonstandard_style,
-    rust_2018_idioms
-)]
-// END - Embark standard lints v0.4
 // crate-specific exceptions:
 #![allow(
     unsafe_code,                // rustc_codegen_ssa requires unsafe functions in traits to be impl'd

crates/spirv-builder/src/lib.rs

@@ -544,9 +544,10 @@ struct RustcOutput {
 fn get_last_artifact(out: &str) -> Option<PathBuf> {
     let last = out
         .lines()
-        .filter_map(|line| match serde_json::from_str::<RustcOutput>(line) {
-            Ok(line) => Some(line),
-            Err(_) => {
+        .filter_map(|line| {
+            if let Ok(line) = serde_json::from_str::<RustcOutput>(line) {
+                Some(line)
+            } else {
                 // Pass through invalid lines
                 println!("{}", line);
                 None

crates/spirv-builder/src/watch.rs

@@ -21,9 +21,9 @@ impl SpirvBuilder {
         }
         let metadata_result = crate::invoke_rustc(&self);
         // Load the dependencies of the thing
-        let metadata_file = match metadata_result {
-            Ok(path) => path,
-            Err(_) => {
+        let metadata_file = if let Ok(path) = metadata_result {
+            path
+        } else {
             let (tx, rx) = sync_channel(0);
             // Fall back to watching from the crate root if the inital compilation fails
             let mut watcher =
@@ -52,7 +52,6 @@ impl SpirvBuilder {
                     break f;
                 }
             }
-            }
         };
         let metadata = self.parse_metadata_file(&metadata_file)?;
         let first_result = metadata;

examples/runners/wgpu/src/bin/wgpu_runner.rs

@@ -1,3 +1,3 @@
 fn main() {
-    example_runner_wgpu::main()
+    example_runner_wgpu::main();
 }

examples/runners/wgpu/src/graphics.rs

@@ -323,6 +323,7 @@ fn create_pipeline(
     })
 }
 
+#[allow(clippy::match_wild_err_arm)]
 pub fn start(options: &Options) {
     // Build the shader before we pop open a window, since it might take a while.
     let event_loop = EventLoop::with_user_event();
@@ -332,7 +333,7 @@ pub fn start(options: &Options) {
         Some(Box::new(move |res| match proxy.send_event(res) {
             Ok(it) => it,
             // ShaderModuleDescriptor is not `Debug`, so can't use unwrap/expect
-            Err(_) => panic!("Event loop dead"),
+            Err(_err) => panic!("Event loop dead"),
         })),
     );
 

examples/shaders/compute-shader/src/lib.rs

@@ -7,8 +7,6 @@
 // HACK(eddyb) can't easily see warnings otherwise from `spirv-builder` builds.
 #![deny(warnings)]
 
-extern crate spirv_std;
-
 use glam::UVec3;
 use spirv_std::glam;
 #[cfg(not(target_arch = "spirv"))]

tests/src/main.rs

@@ -94,6 +94,7 @@ struct Runner {
 impl Runner {
     /// Runs the given `mode` on the directory that matches that name, using the
     /// backend provided by `codegen_backend_path`.
+    #[allow(clippy::string_add)]
     fn run_mode(&self, mode: &'static str) {
         /// RUSTFLAGS passed to all test files.
         fn test_rustc_flags(