Add compile-fail test for missing import shadowing case

Author: bkoropoff

src/test/compile-fail/resolve-conflict-type-vs-import.rs

@@ -0,0 +1,18 @@
+// Copyright 2014 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.
+
+use std::slice::Items;
+//~^ ERROR import `Items` conflicts with type in this module
+
+struct Items;
+
+fn main() {
+}
+