Const dereference works now, so allow it.

Author: jld

src/librustc/middle/check_const.rs

@@ -91,8 +91,8 @@ pub fn check_expr(sess: Session,
                   v: visit::vt<bool>) {
     if is_const {
         match e.node {
-          expr_unary(box(_), _) | expr_unary(uniq(_), _) |
-          expr_unary(deref, _) => {
+          expr_unary(deref, _) => { }
+          expr_unary(box(_), _) | expr_unary(uniq(_), _) => {
             sess.span_err(e.span,
                           ~"disallowed operator in constant expression");
             return;

src/test/run-pass/const-deref.rs

@@ -0,0 +1,20 @@
+// 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.
+
+const C: &'static int = &1000;
+const D: int = *C;
+struct S(&'static int);
+const E: &'static S = &S(C);
+const F: int = ***E;
+
+pub fn main() {
+    fail_unless!(D == 1000);
+    fail_unless!(F == 1000);
+}