Add test for issue 18343

Author: aochagavia

src/test/compile-fail/issue-18343.rs

@@ -0,0 +1,19 @@
+// 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.
+
+struct Obj<'a> {
+    closure: ||: 'a -> u32
+}
+
+fn main() {
+    let o = Obj { closure: || 42 };
+    o.closure(); //~ ERROR type `Obj<'_>` does not implement any method in scope named `closure`
+    //~^ NOTE use `(s.closure)(...)` if you meant to call the function stored in the `closure` field
+}