Returns .true if the garbage collector was called, .false else. This function should be used with great care as explicitly invoking the garbage collector imposes quite a burden on a running system and can severely affect applications. Therefore, garbage collection invocations should be best left to the interpreter. If invoked from a debug version of ooRexx (.RexxInfo~debug=.true), the garbage collector will always be called. If invoked from a release version of ooRexx (.RexxInfo~debug=.false), the garbage collector will not be called, unless the optional argument force is supplied.