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Predicates made available using autoload/2 behave as defined predicates, which implies that any operation on them will perform autoloading if necessary. Notably predicate_property/2, current_predicate/1 and clause/2 are supported.
Currently, neither the existence of File, nor whether it actually exports the given predicates (autoload/2) is verified when the file is loaded. Instead, the declarations are verified when searching for a missing predicate.