REPEAT_LTTactical.REPEAT_LT : (list_tactic -> list_tactic)
Repeatedly applies a list-tactic until it fails.
The list-tactic REPEAT_LT ltac is a list-tactic which
applies ltac to a goal list, and while it succeeds,
continues applying it to the resulting subgoal list.
The application of REPEAT_LT to a list-tactic never
fails, and neither does the composite list-tactic, even if the basic
list-tactic fails immediately.