add regression test for issue rust-lang#24106

Fixes rust-lang#24106.

src/test/run-pass-fulldeps/auxiliary/issue_24106.rs

@@ -0,0 +1,23 @@
+// Copyright 2017 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.
+
+#![crate_type="lib"]
+
+enum E { E0 = 0, E1 = 1 }
+const E0_U8: u8 = E::E0 as u8;
+const E1_U8: u8 = E::E1 as u8;
+
+pub fn go<T>() {
+    match 0 {
+        E0_U8 => (),
+        E1_U8 => (),
+        _ => (),
+    }
+}

src/test/run-pass-fulldeps/issue_24106.rs

@@ -0,0 +1,17 @@
+// Copyright 2017 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.
+
+// aux-build:issue_24106.rs
+
+extern crate issue_24106;
+
+fn main() {
+    issue_24106::go::<()>();
+}