Did you know ... Search Documentation:
Predicate prolog_predicate_name/2
 user:prolog_predicate_name(:Goal, -Name:atom) is semidet[multifile, pce(prolog/boot/pce_portray)]
Hook used by the Prolog graphical tracer to display the frames in the stack.
 user:prolog_predicate_name(:Goal, -Name:atom) is semidet[multifile, pce(prolog/boot/pce_portray)]
Hook used by the Prolog graphical tracer to display the frames in the stack.