Add regression test for rust-lang#13902

Closes rust-lang#13902

Author: frewsxcv

src/test/run-pass/issue-13902.rs

@@ -0,0 +1,22 @@
+// 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.
+
+const JSVAL_TAG_CLEAR: u32 = 0xFFFFFF80;
+const JSVAL_TYPE_INT32: u8 = 0x01;
+const JSVAL_TYPE_UNDEFINED: u8 = 0x02;
+#[repr(u32)]
+enum ValueTag {
+    JSVAL_TAG_INT32 = JSVAL_TAG_CLEAR | (JSVAL_TYPE_INT32 as u32),
+    JSVAL_TAG_UNDEFINED = JSVAL_TAG_CLEAR | (JSVAL_TYPE_UNDEFINED as u32),
+}
+
+fn main() {
+    let _ = ValueTag::JSVAL_TAG_INT32;
+}