
debug(+Goal)

   Execute the goal Goal with the debugger in leap mode.



Arguments
   ?Goal               Atom or compound term.

Type
   Debugging

Description
   The goal Goal is called with the debugger in leap mode.
   debug/1 succeeds or fails depending if Goal succeeds or fails.


   This predicate is particulary useful for debugging large programs that
   would take too much space or time to run completely with the debugger.
   The debugger is only switched on in leap mode at the call port of Goal
   and switched off when Goal exits (or fails, leaves,...).


   If the debugger was already on before calling debug/1, it has no effect.


   An alternative way of turning on the debugger selectively is to
   set the start_tracing property of a particular predicate using
   set_flag/3.




Resatisfiable
      No.

Fail Conditions
      Fails if Goal fails.



Examples
   
Success:
      [eclipse]: [user].
       p :- big_goal1, debug(buggy_goal), big_goal2.
       big_goal1.
       big_goal2.
       buggy_goal.
       user        compiled 208 bytes in 0.02 seconds
      yes.
      [eclipse]: set_flag(big_goal2/0, spy, on),
              set_flag(buggy_goal/0, spy, on).
      yes.
      [eclipse]: p.
      Start debugging - leap mode
       +(1) 0  CALL   buggy_goal %> creep
       +(1) 0  EXIT   buggy_goal %> creep
      Stop debugging.
      yes.





See Also
   debug / 0, notrace / 0, trace / 0, trace / 1, set_flag / 3
