Rollup merge of #41957 - llogiq:clippy-libsyntax, r=petrochenkov

Fix some clippy warnings in libsyntax

This is mostly removing stray ampersands, needless returns and lifetimes. Basically a lot of small changes.

1 files changed, 3 insertions, 5 deletions

diff --git a/src/libsyntax/visit.rs b/src/libsyntax/visit.rs
index 9288d95009c..0b484a4e0af 100644
--- a/src/libsyntax/visit.rs
+++ b/src/libsyntax/visit.rs
@@ -345,9 +345,7 @@ pub fn walk_ty<'a, V: Visitor<'a>>(visitor: &mut V, typ: &'a Ty) {
             visitor.visit_ty(ty);
             visitor.visit_expr(expression)
         }
-        TyKind::TraitObject(ref bounds) => {
-            walk_list!(visitor, visit_ty_param_bound, bounds);
-        }
+        TyKind::TraitObject(ref bounds) |
         TyKind::ImplTrait(ref bounds) => {
             walk_list!(visitor, visit_ty_param_bound, bounds);
         }
@@ -542,7 +540,7 @@ pub fn walk_fn<'a, V>(visitor: &mut V, kind: FnKind<'a>, declaration: &'a FnDecl
             walk_fn_decl(visitor, declaration);
             visitor.visit_block(body);
         }
-        FnKind::Method(_, ref sig, _, body) => {
+        FnKind::Method(_, sig, _, body) => {
             visitor.visit_generics(&sig.generics);
             walk_fn_decl(visitor, declaration);
             visitor.visit_block(body);
@@ -778,7 +776,7 @@ pub fn walk_expr<'a, V: Visitor<'a>>(visitor: &mut V, expression: &'a Expr) {
         }
         ExprKind::InlineAsm(ref ia) => {
             for &(_, ref input) in &ia.inputs {
-                visitor.visit_expr(&input)
+                visitor.visit_expr(input)
             }
             for output in &ia.outputs {
                 visitor.visit_expr(&output.expr)