From a3bca446041eaa3128a79e9afe35da4d47171fb8 Mon Sep 17 00:00:00 2001
From: Joshua Peek <josh@joshpeek.com>
Date: Thu, 7 Jun 2012 10:14:28 -0500
Subject: [PATCH] Prevent multiple overrides

---
 lib/linguist/language.rb | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/linguist/language.rb b/lib/linguist/language.rb
index 56b05c91..6d72d99c 100644
--- a/lib/linguist/language.rb
+++ b/lib/linguist/language.rb
@@ -79,6 +79,10 @@ module Linguist
           warn "Extension is missing a '.': #{extension.inspect}"
         end
 
+        if l = @overrides[extension]
+          raise ArgumentError, "#{extension} is already overridden by #{l.name}"
+        end
+
         @overrides[extension] = language
       end