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-rw-r--r--src/libsyntax/ext/expand.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libsyntax/ext/expand.rs b/src/libsyntax/ext/expand.rs
index 7b4f92ab3ca..f76f10f3de1 100644
--- a/src/libsyntax/ext/expand.rs
+++ b/src/libsyntax/ext/expand.rs
@@ -430,7 +430,7 @@ pub fn core_macros() -> ~str {
     macro_rules! fail_unless(
         ($cond:expr) => {
             if !$cond {
-                fail!(~\"assertion failed: \" + stringify!($cond))
+                ::core::sys::fail_assert(stringify!($cond), file!(), line!())
             }
         }
     )