accessing program listing in prolog -


i'm having strange (or not strange) problems defining variables in swi-prolog. example:

i'd below:

:- initialization(main).  main :-  x = listing(main), write(x).

but it's printing "listing(main)"

maybe, using casual predicate instead of main/0...

?- with_output_to(atom(x), listing(pattern)), write(x). gram:pattern(a, b, c) :-     dig(a, b, c). gram:pattern(a+c, b, e) :-     ten(a, b, d),     dig(c, d, e). ...

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