syntax: cleanup param, method, and misc parsing

src/libsyntax/parse/diagnostics.rs

@@ -1180,7 +1180,7 @@ impl<'a> Parser<'a> {
         }
     }
 
-    crate fn expected_semi_or_open_brace(&mut self) -> PResult<'a, ast::TraitItem> {
+    crate fn expected_semi_or_open_brace<T>(&mut self) -> PResult<'a, T> {
         let token_str = self.this_token_descr();
         let mut err = self.fatal(&format!("expected `;` or `{{`, found {}", token_str));
         err.span_label(self.token.span, "expected `;` or `{`");

src/libsyntax/parse/parser/ty.rs

@@ -231,19 +231,15 @@ impl<'a> Parser<'a> {
     }
 
     fn parse_ptr(&mut self) -> PResult<'a, MutTy> {
-        let mutbl = if self.eat_keyword(kw::Mut) {
-            Mutability::Mutable
-        } else if self.eat_keyword(kw::Const) {
-            Mutability::Immutable
-        } else {
+        let mutbl = self.parse_const_or_mut().unwrap_or_else(|| {
             let span = self.prev_span;
             let msg = "expected mut or const in raw pointer type";
             self.struct_span_err(span, msg)
                 .span_label(span, msg)
                 .help("use `*mut T` or `*const T` as appropriate")
                 .emit();
             Mutability::Immutable
-        };
+        });
         let t = self.parse_ty_no_plus()?;
         Ok(MutTy { ty: t, mutbl })
     }

src/test/ui/async-await/edition-deny-async-fns-2015.stderr

@@ -10,18 +10,18 @@ error[E0670]: `async fn` is not permitted in the 2015 edition
 LL | fn baz() { async fn foo() {} }
    |            ^^^^^
 
-error[E0670]: `async fn` is not permitted in the 2015 edition
-  --> $DIR/edition-deny-async-fns-2015.rs:8:5
-   |
-LL |     async fn bar() {}
-   |     ^^^^^
-
 error[E0670]: `async fn` is not permitted in the 2015 edition
   --> $DIR/edition-deny-async-fns-2015.rs:7:1
    |
 LL | async fn async_baz() {
    | ^^^^^
 
+error[E0670]: `async fn` is not permitted in the 2015 edition
+  --> $DIR/edition-deny-async-fns-2015.rs:8:5
+   |
+LL |     async fn bar() {}
+   |     ^^^^^
+
 error[E0670]: `async fn` is not permitted in the 2015 edition
   --> $DIR/edition-deny-async-fns-2015.rs:14:5
    |