prolog_list_goal(:Goal)user to list the currently called 
predicate. This hook may be defined to list only relevant clauses of the 
indicated Goal and/or show the actual source code in an 
editor. See also portray/1 
and multifile/1.
prolog_list_goal(:Goal)user to list the currently called 
predicate. This hook may be defined to list only relevant clauses of the 
indicated Goal and/or show the actual source code in an 
editor. See also portray/1 
and multifile/1.