From b66a883b75774de314557484359480f0520e12fc Mon Sep 17 00:00:00 2001
From: Markus Schirp <mbj@schirp-dso.com>
Date: Wed, 3 Jul 2013 00:32:48 +0200
Subject: [PATCH] Add a warning about method subjects that could not be
 source-located!

---
 lib/mutant/matcher/method.rb | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/lib/mutant/matcher/method.rb b/lib/mutant/matcher/method.rb
index b4e288bd..25305918 100644
--- a/lib/mutant/matcher/method.rb
+++ b/lib/mutant/matcher/method.rb
@@ -22,7 +22,11 @@ module Mutant
         return to_enum unless block_given?
 
         unless skip?
-          yield subject if subject
+          if subject
+            yield subject
+          else
+            $stderr.puts "Cannot find definition of: #{identification} in #{source_location.join(':')}"
+          end
         end
 
         self