File: TRY.doc

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\DOC TRY

\TYPE {TRY : (tactic -> tactic)}

\SYNOPSIS
Makes a tactic have no effect rather than fail.

\KEYWORDS
tactical, failure.

\DESCRIBE
For any tactic {T}, the application {TRY T} gives a new tactic
which has the same effect as {T} if that succeeds, and otherwise has
no effect.

\FAILURE
The application of {TRY} to a tactic never fails. The resulting
tactic never fails.

\SEEALSO
CHANGED_TAC, VALID.

\ENDDOC