Added positive tests for integer literal base interpretation.

Author: mattcarberry

src/test/run-pass/integer-literal-radix.rs

@@ -0,0 +1,27 @@
+// 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.
+
+pub fn main() {
+    let a = 0xBEEF;
+    let b = 0o755;
+    let c = 0b10101;
+    let d = -0xBEEF;
+    let e = -0o755;
+    let f = -0b10101;
+
+    assert_eq!(a, 48879);
+    assert_eq!(b, 493);
+    assert_eq!(c, 21);
+    assert_eq!(d, -48879);
+    assert_eq!(e, -493);
+    assert_eq!(f, -21);
+
+
+}