prolog_code:head_name_arity/3

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Predicate head_name_arity/3

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swipl
- library

head_name_arity(?Goal, ?Name, ?Arity) is det: Similar to functor/3, but deals with SWI-Prolog's zero-argument callable terms and avoids creating a non-callable term if Name is not an atom and Arity is zero.