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Pack must_trace -- prolog/frames.pl
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 stack_depth(?Level) is semidet
Stack Depth.
 stack_check is semidet
Stack Check.
 stack_check(?BreakIfOver) is semidet
Stack Check.
 stack_check(?BreakIfOver, ?Error) is semidet
Stack Check.
 stack_check_else(?BreakIfOver, ?Call) is semidet
Stack Check Else.
 in_pengines is semidet
In Pengines.
 relative_frame(?Attrib, ?Term, ?Nth) is semidet
Relative Frame.
 parent_goal(?Goal, ?Nth) is semidet
Parent Goal.
 find_parent_frame_attribute(?Attrib, ?Term, ?Nth, ?RealNth, ?FrameNum) is semidet
Find Parent Frame Attribute.
 prolog_frame_match(?Frame, :TermAttrib, :TermTerm) is semidet
Prolog Frame Match.
 current_frames(?Frame, ?Attrib, :GoalN, ?NextList) is semidet
Current Frames.
 current_next_frames(?Attrib, ?Nth, ?Frame, ?NextList) is semidet
Current Next Frames.