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
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