fix fixes ;-).

git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@1499 b08c6af1-5177-4d33-ba66-4b1c6b8b522a

changes-5.1.html

@@ -16,6 +16,7 @@
 
 <h2>Yap-5.1.0:</h2>
 <ul>
+<li> FIXED: don't call goal_expand when looking for handlers of undefined procedures. </li>
 <li> FIXED: always walk through modules in the same order when waking
   up variables (otherwise, breaks CLP(QR)). </li>
 <li> NEW: SWI-like yap_flag(float_format,_). </li>

pl/boot.yap

@@ -749,10 +749,12 @@ not(G) :-    \+ '$execute'(G).
 	S \= M, % can't try importing from the module itself.
 	!,
 	'$exit_undefp'.
+/*
 '$find_undefp_handler'(G,M,NG,M) :-
 	'$is_expand_goal_or_meta_predicate'(G,M),
 	'$system_catch'(goal_expansion(G, M, NG), user, _, fail), !,
 	'$exit_undefp'.
+*/
 '$find_undefp_handler'(G,M,NG,user) :-
 	\+ '$undefined'(unknown_predicate_handler(_,_,_), user),
 	'$system_catch'(unknown_predicate_handler(G,M,NG), user, Error, '$leave_undefp'(Error)), !,