REPEATTactical.REPEAT : (tactic -> tactic)
Repeatedly applies a tactic until it fails.
The tactic REPEAT T is a tactic which applies
T to a goal, and while it succeeds, continues applying it
to all subgoals generated.
The application of REPEAT to a tactic never fails, and
neither does the composite tactic, even if the basic tactic fails
immediately.
Tactical.EVERY, Tactical.FIRST, Tactical.ORELSE, Tactical.THEN, Tactical.THENL