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call(plus(1), 2, X)will call
plus(1, 2, X), binding X to 3.
The call/[2..] construct is handled by the compiler. The predicates call/[2-8] are defined as real (meta-)predicates and are available to inspection through current_predicate/1, predicate_property/2, etc.72Arities 2..8 are demanded by ISO/IEC 13211-1:1995/Cor.2:2012. Higher arities are handled by the compiler and runtime system, but the predicates are not accessible for inspection.73Future versions of the reflective predicate may fake the presence of call/9.. . Full logical behaviour, generating all these pseudo predicates, is probably undesirable and will become impossible if max_arity is removed.