From 14df8447445440794d363f6dc3fbb5220bb0a775 Mon Sep 17 00:00:00 2001
From: Alex Crichton <alex@alexcrichton.com>
Date: Tue, 19 Mar 2013 14:05:20 -0400
Subject: Allow custom messages on assert statements

---
 src/libsyntax/ext/expand.rs | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'src/libsyntax')

diff --git a/src/libsyntax/ext/expand.rs b/src/libsyntax/ext/expand.rs
index ec693fa1f08..ad05e2f21e6 100644
--- a/src/libsyntax/ext/expand.rs
+++ b/src/libsyntax/ext/expand.rs
@@ -456,6 +456,11 @@ pub fn core_macros() -> ~str {
             if !$cond {
                 ::core::sys::fail_assert(stringify!($cond), file!(), line!())
             }
+        };
+        ($cond:expr, $msg:expr) => {
+            if !$cond {
+                ::core::sys::fail_assert($msg, file!(), line!())
+            }
         }
     )
 
-- 
cgit 1.4.1-3-g733a5