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UNDISCH_TAC : term -> tactic
SYNOPSIS
Undischarges an assumption.
DESCRIPTION
A ?- t
==================== UNDISCH_TAC `v`
A - {v} ?- v ==> t
FAILURE CONDITIONS
UNDISCH_TAC will fail if `v` is not an assumption.
COMMENTS
UNDISCHarging `v` will remove all assumptions that are alpha-equivalent to
`v`.