auto merge of #7802 : catamorphism/rust/issue-6128, r=catamorphism

src/test/run-pass/issue-6128.rs

@@ -0,0 +1,29 @@
+// Copyright 2013 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.
+
+// xfail-test
+
+use std::hashmap::HashMap;
+
+trait Graph<Node, Edge> {
+    fn f(&self, Edge);
+
+}
+
+impl<E> Graph<int, E> for HashMap<int, int> {
+    fn f(&self, _e: E) {
+        fail!();
+    }
+}
+
+fn main() {
+    let g : ~HashMap<int, int> = ~HashMap::new();
+    let _g2 : ~Graph<int,int> = g as ~Graph<int,int>;
+}