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\DOC NO_THEN
\TYPE {NO_THEN : thm_tactical}
\SYNOPSIS
Theorem-tactical which always fails.
\KEYWORDS
theorem-tactic.
\DESCRIBE
When applied to a theorem-tactic and a theorem, the theorem-tactical
{NO_THEN} always fails with {Failwith "NO_THEN"}.
\FAILURE
Always fails when applied to a theorem-tactic and a theorem (note that it
never gets as far as being applied to a goal!)
\USES
Writing compound tactics or tacticals.
\SEEALSO
ALL_TAC, ALL_THEN, FAIL_TAC, NO_TAC.
\ENDDOC
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