meaningless infinite loop

"rossano deias" <[email protected]>
Newsgroups gmane.comp.gnu.prolog.bugs
Message-ID <[email protected]> 
with gprolog 1.3.0 and gentoo linux

zeros([],0).
zeros([0|T],N) :- zeros(T,N1) , N is N1 + 1.

| ?- zeros(L,4).

L = [0,0,0,0] ? ;
.......
infinite loop
.......


 why?
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