Checking location and syntax of non_exhaustive attribute.

src/test/compile-fail/rfc-2008-non-exhaustive/invalid-attribute.rs

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+// Copyright 2012 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.
+
+#![feature(non_exhaustive)]
+
+#[non_exhaustive(anything)]
+//~^ ERROR attribute should be empty [E0911]
+struct Foo;
+
+#[non_exhaustive]
+//~^ ERROR attribute can only be applied to a struct or enum [E0910]
+trait Bar { }
+
+#[non_exhaustive]
+//~^ ERROR attribute can only be applied to a struct or enum [E0910]
+union Baz {
+    f1: u16,
+    f2: u16
+}
+
+fn main() { }