syntax: Stop the bump loop for trait items at } and EOF.

backport of 221d0fb to beta
with hand-resolution of conflicts and reverting to `try!` syntax.

Author: eddyb

src/libsyntax/parse/parser.rs

@@ -941,7 +941,9 @@ impl<'a> Parser<'a> {
     {
         try!(self.expect(bra));
         let result = self.parse_seq_to_before_end(ket, sep, f);
-        self.bump();
+        if self.token == *ket {
+            self.bump();
+        }
         Ok(result)
     }
 
@@ -1276,15 +1278,21 @@ impl<'a> Parser<'a> {
                     Ok(cua) => cua,
                     Err(e) => {
                         loop {
-                            p.bump();
-                            if p.token == token::Semi {
-                                p.bump();
-                                break;
-                            }
+                            match p.token {
+                                token::Eof => break,
+
+                                token::CloseDelim(token::Brace) |
+                                token::Semi => {
+                                    p.bump();
+                                    break;
+                                }
+
+                                token::OpenDelim(token::Brace) => {
+                                    try!(p.parse_token_tree());
+                                    break;
+                                }
 
-                            if p.token == token::OpenDelim(token::DelimToken::Brace) {
-                                try!(p.parse_token_tree());
-                                break;
+                                _ => p.bump()
                             }
                         }
 

src/test/parse-fail/issue-10636-2.rs

@@ -17,5 +17,4 @@ pub fn trace_option(option: Option<isize>) { //~ HELP did you mean to close this
     option.map(|some| 42; //~ NOTE: unclosed delimiter
                           //~^ ERROR: expected one of
 } //~ ERROR: incorrect close delimiter
-//~^ ERROR: expected one of
-//~ ERROR: this file contains an un-closed delimiter
+//~^ ERROR: unexpected token

src/test/parse-fail/issue-32446.rs

@@ -0,0 +1,16 @@
+// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// compile-flags: -Z parse-only
+
+fn main() {}
+
+// This used to end up in an infite loop trying to bump past EOF.
+trait T { ... } //~ ERROR

src/test/parse-fail/pat-lt-bracket-6.rs

@@ -10,5 +10,5 @@
 
 fn main() {
     let Test(&desc[..]) = x; //~ error: expected one of `,` or `@`, found `[`
-    //~^ ERROR expected one of `:`, `;`, or `=`, found `..`
+    //~^ ERROR expected one of `:`, `;`, `=`, or `@`, found `[`
 }

src/test/parse-fail/pat-lt-bracket-7.rs

@@ -10,5 +10,5 @@
 
 fn main() {
     for thing(x[]) in foo {} //~ error: expected one of `,` or `@`, found `[`
-    //~^ ERROR: expected `in`, found `]`
+    //~^ ERROR expected one of `@` or `in`, found `[`
 }