FILTER_GEN_TAC : (term -> tactic)

SYNOPSIS
Strips off a universal quantifier, but fails for a given quantified variable.

DESCRIBE
When applied to a term s and a goal A ?- !x. t, the tactic FILTER_GEN_TAC fails if the quantified variable x is the same as s, but otherwise advances the goal in the same way as GEN_TAC, i.e. returns the goal A ?- t[x'/x] where x' is a variant of x chosen to avoid clashing with any variables free in the goal's assumption list. Normally x' is just x.
     A ?- !x. t
   ==============  FILTER_GEN_TAC "s"
    A ?- t[x'/x]

FAILURE
Fails if the goal's conclusion is not universally quantified or the quantified variable is equal to the given term.

SEEALSO  GEN,   GEN_TAC,   GENL,   GEN_ALL,   SPEC,   SPECL,   SPEC_ALL,   SPEC_TAC,   STRIP_TAC

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