TRY : (tactic -> tactic)

SYNOPSIS
Makes a tactic have no effect rather than fail.

DESCRIBE
For any tactic T, the application TRY T gives a new tactic which has the same effect as T if that succeeds, and otherwise has no effect.

FAILURE
The application of TRY to a tactic never fails. The resulting tactic never fails.

SEEALSO  CHANGED_TAC,   VALID

HOL  Kananaskis 0