syntax: Enable parsing of `const` globals

This rewrites them to the current `ItemStatic` production of the compiler, but I
want to get this into a snapshot. It will be illegal to use a `static` in a
pattern of a `match` statement, so all those current uses will need to be
rewritten to `const` once it's implemented. This requires that the stage0
snapshot is able to parse `const`.

cc #17718

1 files changed, 17 insertions, 0 deletions

diff --git a/src/test/compile-fail/issue-17718-const-mut.rs b/src/test/compile-fail/issue-17718-const-mut.rs
new file mode 100644
index 00000000000..31a5fee2044
--- /dev/null
+++ b/src/test/compile-fail/issue-17718-const-mut.rs
@@ -0,0 +1,17 @@
+// Copyright 2014 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
+mut //~ ERROR: const globals cannot be mutable, did you mean to declare a static?
+FOO: uint = 3;
+
+fn main() {
+}
+