Add regression test

Author: jseyfried

src/test/compile-fail/lexical-scopes.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.
+
+struct T { i: i32 }
+fn f<T>() {
+    let t = T { i: 0 }; //~ ERROR `T` does not name a structure
+}
+
+mod Foo {
+    pub fn f() {}
+}
+fn g<Foo>() {
+    Foo::f(); //~ ERROR no associated item named `f`
+}
+
+fn main() {}