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check if argument to when is bound (obs from Ulrich Neumerkel).

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Vitor Santos Costa 2009-05-17 10:58:21 -07:00
parent f4e3869025
commit 55036ad9bb
1 changed files with 2 additions and 0 deletions
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pl/corout.yap
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@ -315,6 +315,8 @@ when(_,Goal) :-
% $when/5 and $when_suspend succeds when there is need to suspend a goal
%
%
'$when'(V, G, Done, LG0, LGF) :- var(V), !,
'$do_error'(instantiation_error,when(V,G)).
'$when'(nonvar(V), G, Done, LG0, LGF) :-
'$when_suspend'(nonvar(V), G, Done, LG0, LGF).
'$when'(?=(X,Y), G, Done, LG0, LGF) :-