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\DOC RECALL_ACCEPT_TAC
\TYPE {RECALL_ACCEPT_TAC : ('a -> thm) -> 'a -> goal -> goalstate}
\SYNOPSIS
Delay evaluation of theorem-producing function till needed.
\DESCRIBE
Given a theorem-producing inference rule {f} and its argument {a}, the tactic
{RECALL_ACCEPT_TAC f a} will evaluate {th = f a} and do {ACCEPT_TAC th}, but
only when the tactic is applied to a goal.
\FAILURE
Never fails until subsequently applied to a goal, but then may fail if the
theorem-producing function does.
\EXAMPLE
You might for example do
{
RECALL_ACCEPT_TAC (EQT_ELIM o NUM_REDUCE_CONV) `16 EXP 53 < 15 EXP 55`;;
}
\noindent and the call
{
(EQT_ELIM o NUM_REDUCE_CONV) `16 EXP 53 < 15 EXP 55`
}
\noindent will be delayed until the tactic is applied.
\USES
Delaying a time-consuming compound inference rule in a tactic script until it
is actually used.
\ENDDOC
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