Allow constant c-like enum to integral/float cast

src/test/run-pass/enum-cast.rs

@@ -0,0 +1,31 @@
+// Copyright 2013 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.
+
+enum A { A1, A2 }
+enum B { B1=0, B2=2 }
+
+fn main () {
+    const c1: int = A2 as int;
+    const c2: int = B2 as int;
+    const c3: float = A2 as float;
+    const c4: float = B2 as float;
+    let a1 = A2 as int;
+    let a2 = B2 as int;
+    let a3 = A2 as float;
+    let a4 = B2 as float;
+    assert(c1 == 1);
+    assert(c2 == 2);
+    assert(c3 == 1.0);
+    assert(c4 == 2.0);
+    assert(a1 == 1);
+    assert(a2 == 2);
+    assert(a3 == 1.0);
+    assert(a4 == 2.0);
+}