add test for #37765

Author: durka

src/test/run-pass/path-lookahead.rs

@@ -0,0 +1,23 @@
+// 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.
+
+// Parser test for #37765
+
+fn with_parens<T: ToString>(arg: T) -> String { //~WARN dead_code
+  return (<T as ToString>::to_string(&arg)); //~WARN unused_parens
+}
+
+fn no_parens<T: ToString>(arg: T) -> String { //~WARN dead_code
+  return <T as ToString>::to_string(&arg);
+}
+
+fn main() {
+
+}