From 27668fbfab593c0e671f0ef104b1d677a770ea7c Mon Sep 17 00:00:00 2001
From: Josh Matthews <josh@joshmatthews.net>
Date: Thu, 7 Mar 2013 15:35:43 -0500
Subject: Allow casting integers to unsafe pointers in constant expressions.

---
 src/librustc/middle/trans/consts.rs     |  3 +++
 src/test/run-pass/const-cast-ptr-int.rs | 15 +++++++++++++++
 2 files changed, 18 insertions(+)
 create mode 100644 src/test/run-pass/const-cast-ptr-int.rs

diff --git a/src/librustc/middle/trans/consts.rs b/src/librustc/middle/trans/consts.rs
index 1117d9b9bf8..b7a536aa3a2 100644
--- a/src/librustc/middle/trans/consts.rs
+++ b/src/librustc/middle/trans/consts.rs
@@ -345,6 +345,9 @@ fn const_expr_unchecked(cx: @CrateContext, e: @ast::expr) -> ValueRef {
               (expr::cast_pointer, expr::cast_pointer) => {
                 llvm::LLVMConstPointerCast(v, llty)
               }
+              (expr::cast_integral, expr::cast_pointer) => {
+                llvm::LLVMConstIntToPtr(v, llty)
+              }
               _ => {
                 cx.sess.impossible_case(e.span,
                                         ~"bad combination of types for cast")
diff --git a/src/test/run-pass/const-cast-ptr-int.rs b/src/test/run-pass/const-cast-ptr-int.rs
new file mode 100644
index 00000000000..559e11efcff
--- /dev/null
+++ b/src/test/run-pass/const-cast-ptr-int.rs
@@ -0,0 +1,15 @@
+// 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 a: *u8 = 0 as *u8;
+
+fn main() {
+    assert a == ptr::null();
+}
\ No newline at end of file
-- 
cgit 1.4.1-3-g733a5