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causes callable to succeed on any meta-argument.63We think that callable/1 should be deprecated and there should be two new predicates, one performing a test for callable that is minimally module aware and possibly consistent with type-checking in call/1 and a second predicate that tests for atom or compound. Consider the program and query below:
:- meta_predicate p(0). p(G) :- callable(G), call(G). ?- p(22). ERROR: Type error: `callable' expected, found `22' ERROR: In: ERROR:  p(user:22)
p(22)shows how useless it is!