From bc81d279fa04de7c956871ff6668d2a3d5e6d78c Mon Sep 17 00:00:00 2001
From: Huon Wilson <dbau.pp+github@gmail.com>
Date: Sat, 8 Jun 2013 01:46:49 +1000
Subject: [PATCH] rustc: Convert a fail! to a useful error message.

---
 src/librustc/middle/const_eval.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/librustc/middle/const_eval.rs b/src/librustc/middle/const_eval.rs
index 7e8e5bffb5705..0327a8e81c737 100644
--- a/src/librustc/middle/const_eval.rs
+++ b/src/librustc/middle/const_eval.rs
@@ -242,7 +242,7 @@ pub enum const_val {
 pub fn eval_const_expr(tcx: middle::ty::ctxt, e: @expr) -> const_val {
     match eval_const_expr_partial(tcx, e) {
         Ok(ref r) => (/*bad*/copy *r),
-        Err(ref s) => fail!(/*bad*/copy *s)
+        Err(ref s) => tcx.sess.span_fatal(e.span, *s)
     }
 }