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Pack xlibrary -- prolog/ontrace.pl
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Undocumented predicates

The following predicates are exported, but not or incorrectly documented.

 ontrace(Arg1, Arg2, Arg3)
 clause_pc_location(Arg1, Arg2, Arg3)
 cleanup_trace(Arg1)
 call_inoutex(Arg1, Arg2, Arg3)