MATCH_ASSUM_RENAME_TAC
Q.MATCH_ASSUM_RENAME_TAC : term quotation -> tactic
Replaces selected terms with new variables by matching a pattern against an assumption.
When applied to the goal (asl, w), the tactic
Q.MATCH_ASSUM_RENAME_TAC q parses the quotation q in the context of
the goal, producing a term to use as a pattern. The tactic then attempts
a (first order) match of the pattern against each term in asl,
stopping on the first matching assumption a.
For each variable v in the pattern, there will be an instantiation
term t, such that the substitution
pattern[v1 |-> t1, v2 |-> t2, ...]
produces a. The effect of the tactic is to then replace each t with
the corresponding v, yielding a new goal. Note that underscores within
a pattern, though strictly speaking variables, are not included in this
reverse instantiation.
Failure
MATCH_ASSUM_RENAME_TAC fails if the pattern provided does not match
any assumption, or if variables from the goal are used in the pattern in
ways that make the pattern fail to type-check.
Example
If the current goal is
(f x = Pair C'' C0') ?- (f C'' = f C0')
then applying the tactic Q.MATCH_ASSUM_RENAME_TAC `_ = Pair c1 c2`
results in the goal
(f x = Pair c1 c2) ?- (f c1 = f c2)
Comments
This tactic improves on the following tedious workflow:
Q.PAT_ASSUM pat MP_TAC, Q.MATCH_ABBREV_TAC `pat ==> X`,
Q.UNABBREV_TAC `X`, markerLib.RM_ALL_ABBREVS_TAC, STRIP_TAC.