libsyntax: Implement a macro `die!` to replace the `fail` expression. r=brson

1 files changed, 6 insertions, 3 deletions

diff --git a/src/libcore/rt.rs b/src/libcore/rt.rs
index 9bc83a5f904..04a8ee30235 100644
--- a/src/libcore/rt.rs
+++ b/src/libcore/rt.rs
@@ -34,9 +34,12 @@ extern mod rustrt {
 // 'rt_', otherwise the compiler won't find it. To fix this, see
 // gather_rust_rtcalls.
 #[rt(fail_)]
-pub fn rt_fail_(expr: *c_char, file: *c_char, line: size_t) {
-    cleanup_stack_for_failure();
-    rustrt::rust_upcall_fail(expr, file, line);
+pub fn rt_fail_(expr: *c_char, file: *c_char, line: size_t) -> ! {
+    unsafe {
+        cleanup_stack_for_failure();
+        rustrt::rust_upcall_fail(expr, file, line);
+        cast::transmute(())
+    }
 }
 
 #[rt(fail_bounds_check)]