X-Git-Url: https://git.lizzy.rs/?a=blobdiff_plain;f=src%2Flibrustc_lint%2Funused.rs;h=af43030d0f2aecf9e5038f4385d0995aded2e424;hb=f49f38871389041671cc710a044e8360091840a3;hp=a93946df68f9235d484b50da6fae287bada285ab;hpb=aba84894d1879a7429d5bc20d0bfdca3471685de;p=rust.git

diff --git a/src/librustc_lint/unused.rs b/src/librustc_lint/unused.rs
index a93946df68f..af43030d0f2 100644
--- a/src/librustc_lint/unused.rs
+++ b/src/librustc_lint/unused.rs
@@ -1,6 +1,7 @@
 use rustc::hir::def::{Res, DefKind};
 use rustc::hir::def_id::DefId;
 use rustc::lint;
+use rustc::lint::builtin::UNUSED_ATTRIBUTES;
 use rustc::ty::{self, Ty};
 use rustc::ty::adjustment;
 use rustc_data_structures::fx::FxHashMap;
@@ -25,7 +26,7 @@
     pub UNUSED_MUST_USE,
     Warn,
     "unused result of a type flagged as `#[must_use]`",
-    report_in_external_macro: true
+    report_in_external_macro
 }
 
 declare_lint! {
@@ -277,12 +278,6 @@ fn check_stmt(&mut self, cx: &LateContext<'_, '_>, s: &hir::Stmt) {
     }
 }
 
-declare_lint! {
-    pub UNUSED_ATTRIBUTES,
-    Warn,
-    "detects attributes that were not used by the compiler"
-}
-
 #[derive(Copy, Clone)]
 pub struct UnusedAttributes {
     builtin_attributes: &'static FxHashMap<Symbol, &'static BuiltinAttribute>,
@@ -603,6 +598,25 @@ fn check_param(&mut self, cx: &EarlyContext<'_>, param: &ast::Param) {
     fn check_arm(&mut self, cx: &EarlyContext<'_>, arm: &ast::Arm) {
         self.check_unused_parens_pat(cx, &arm.pat, false, false);
     }
+
+    fn check_ty(&mut self, cx: &EarlyContext<'_>, ty: &ast::Ty) {
+        if let &ast::TyKind::Paren(ref r) = &ty.kind {
+            match &r.kind {
+                &ast::TyKind::TraitObject(..) => {}
+                &ast::TyKind::ImplTrait(_, ref bounds) if bounds.len() > 1 => {}
+                _ => {
+                    let pattern_text = if let Ok(snippet) = cx.sess().source_map()
+                        .span_to_snippet(ty.span) {
+                            snippet
+                        } else {
+                            pprust::ty_to_string(ty)
+                        };
+
+                    Self::remove_outer_parens(cx, ty.span, &pattern_text, "type", (false, false));
+                }
+            }
+        }
+    }
 }
 
 declare_lint! {