Adrien Di Mascio <Adrien.DiMascio@logilab.fr> [Thu, 25 Feb 2010 11:43:11 +0100] rev 4699
[hooks] match_rtype and match_rtype_sets don't need to extend match_search_state
The only method actually used by those 2 classes is __str__ that is defined
on ExpectedValueSelector, not match_search_state.