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\DOC TAC_PROOF
\TYPE {TAC_PROOF : goal * tactic -> thm}
\SYNOPSIS
Attempts to prove a goal using a given tactic.
\DESCRIBE
When applied to a goal-tactic pair {(A ?- t,tac)}, the {TAC_PROOF} function
attempts to prove the goal {A ?- t}, using the tactic {tac}. If it succeeds, it
returns the theorem {A' |- t} corresponding to the goal, where the assumption
list {A'} may be a proper superset of {A} unless the tactic is valid; there
is no inbuilt validity checking.
\FAILURE
Fails unless the goal has hypotheses and conclusions all of type {bool},
and the tactic can solve the goal.
\SEEALSO
prove, VALID.
\ENDDOC
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