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trueif Frame still is a candidate for backtracking;
<module>:<goal>. Do not instantiate variables in this goal unless you know what you are doing! Note that the returned term may contain references to the frame and should be discarded before the frame terminates.204The returned term is actually an illegal Prolog term that may hold references from the global to the local stack to preserve the variable names.
goal, but only returning the [<module>:]<name>/<arity> term describing the term, not the actual arguments. It avoids creating an illegal term as
goaland is used by the library
trueif Frame is the top Prolog goal from a recursive call back from the foreign language;
trueif the frame is hidden from the user, either because a parent has the hide-childs attribute (all system predicates), or the system has no trace-me attribute.
trueif this frame was skipped in the debugger.