Added debug helper code

theano/gof/cmodule.py

@@ -948,6 +948,10 @@ class ModuleCache(object):
         msg = ''
         if found == 0:
             msg = 'Key not found in unpickled KeyData file'
+            if key_data.keys:
+                # This is only to make debugging in pdb easier, by providing
+                # the offending key in the local context.
+                other_key = key_data.keys.__iter__().next()
         elif found > 1:
             msg = 'Multiple equal keys found in unpickled KeyData file'
         if msg: