NO_TAC
Tactical.NO_TAC : tactic
Tactic which always fails.
Whatever goal it is applied to, NO_TAC always fails with string `NO_TAC`.
`NO_TAC`
Always fails.
Tactical.ALL_TAC, Thm_cont.ALL_THEN, Tactical.FAIL_TAC, Thm_cont.NO_THEN
Tactical.ALL_TAC
Thm_cont.ALL_THEN
Tactical.FAIL_TAC
Thm_cont.NO_THEN