From a7bd817017c247edb0680936c6cf34ec4d8e7fc0 Mon Sep 17 00:00:00 2001
From: Tim Chevalier <chevalier@alum.wellesley.edu>
Date: Fri, 13 Jan 2012 20:43:25 -0800
Subject: [PATCH] Fail slightly more gracefully when given an -o filename that
 doesn't have an extension

---
 src/comp/back/link.rs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/comp/back/link.rs b/src/comp/back/link.rs
index f893aae4847..881d043e010 100644
--- a/src/comp/back/link.rs
+++ b/src/comp/back/link.rs
@@ -445,7 +445,10 @@ fn build_link_meta(sess: session, c: ast::crate, output: str,
                 let name =
                     {
                         let os = str::split(fs::basename(output), '.' as u8);
-                        assert (vec::len(os) >= 2u);
+                        if (vec::len(os) < 2u) {
+                            sess.fatal(#fmt("Output file name %s doesn't\
+                              appear to have an extension", output));
+                        }
                         vec::pop(os);
                         str::connect(os, ".")
                     };