Add test for #26646.

Author: Eljay

src/test/run-pass/issue-26646.rs

@@ -0,0 +1,21 @@
+// Copyright 2015 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.
+
+#![deny(unused_attributes)]
+
+#[repr(C)]
+#[repr(packed)]
+pub struct Foo;
+
+#[repr(packed)]
+#[repr(C)]
+pub struct Bar;
+
+fn main() { }