From b5139c5c5868f6f27e06f458fa8ee54c9e8adffb Mon Sep 17 00:00:00 2001
From: Seo Sanghyeon <sanxiyn@gmail.com>
Date: Fri, 31 Jul 2015 21:24:55 +0900
Subject: [PATCH] Fix `impl A .. {}`

---
 src/libsyntax/parse/parser.rs                   |  2 +-
 src/test/parse-fail/empty-impl-semicolon.rs     |  2 +-
 src/test/parse-fail/issue-27255.rs              | 15 +++++++++++++++
 src/test/parse-fail/multitrait.rs               |  2 +-
 src/test/parse-fail/trait-bounds-not-on-impl.rs |  2 +-
 5 files changed, 19 insertions(+), 4 deletions(-)
 create mode 100644 src/test/parse-fail/issue-27255.rs

diff --git a/src/libsyntax/parse/parser.rs b/src/libsyntax/parse/parser.rs
index 11611c9adb0..e7ab9a73c0f 100644
--- a/src/libsyntax/parse/parser.rs
+++ b/src/libsyntax/parse/parser.rs
@@ -4610,7 +4610,7 @@ impl<'a> Parser<'a> {
             None
         };
 
-        if try!(self.eat(&token::DotDot) ){
+        if opt_trait.is_some() && try!(self.eat(&token::DotDot) ){
             if generics.is_parameterized() {
                 self.span_err(impl_span, "default trait implementations are not \
                                           allowed to have generics");
diff --git a/src/test/parse-fail/empty-impl-semicolon.rs b/src/test/parse-fail/empty-impl-semicolon.rs
index e356ab1debc..d9f8add8cfb 100644
--- a/src/test/parse-fail/empty-impl-semicolon.rs
+++ b/src/test/parse-fail/empty-impl-semicolon.rs
@@ -10,4 +10,4 @@
 
 // compile-flags: -Z parse-only
 
-impl Foo; //~ ERROR expected one of `(`, `+`, `..`, `::`, `<`, `for`, `where`, or `{`, found `;`
+impl Foo; //~ ERROR expected one of `(`, `+`, `::`, `<`, `for`, `where`, or `{`, found `;`
diff --git a/src/test/parse-fail/issue-27255.rs b/src/test/parse-fail/issue-27255.rs
new file mode 100644
index 00000000000..a751c4af494
--- /dev/null
+++ b/src/test/parse-fail/issue-27255.rs
@@ -0,0 +1,15 @@
+// Copyright 2015 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
+
+impl A .. {} //~ ERROR
+
+fn main() {}
diff --git a/src/test/parse-fail/multitrait.rs b/src/test/parse-fail/multitrait.rs
index a1c737609d1..2a8d6d99957 100644
--- a/src/test/parse-fail/multitrait.rs
+++ b/src/test/parse-fail/multitrait.rs
@@ -15,7 +15,7 @@ struct S {
 }
 
 impl Cmp, ToString for S {
-//~^ ERROR: expected one of `(`, `+`, `..`, `::`, `<`, `for`, `where`, or `{`, found `,`
+//~^ ERROR: expected one of `(`, `+`, `::`, `<`, `for`, `where`, or `{`, found `,`
   fn eq(&&other: S) { false }
   fn to_string(&self) -> String { "hi".to_string() }
 }
diff --git a/src/test/parse-fail/trait-bounds-not-on-impl.rs b/src/test/parse-fail/trait-bounds-not-on-impl.rs
index 7a20b00ce12..3bd8908d18b 100644
--- a/src/test/parse-fail/trait-bounds-not-on-impl.rs
+++ b/src/test/parse-fail/trait-bounds-not-on-impl.rs
@@ -17,7 +17,7 @@ struct Bar;
 
 impl Foo + Owned for Bar {
 //~^ ERROR not a trait
-//~^^ ERROR expected one of `..`, `where`, or `{`, found `Bar`
+//~^^ ERROR expected one of `where` or `{`, found `Bar`
 }
 
 fn main() { }