File: FIRST.doc

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\DOC FIRST

\TYPE {FIRST : (tactic list -> tactic)}

\SYNOPSIS
Applies the first tactic in a tactic list which succeeds.

\KEYWORDS
tactical.

\DESCRIBE
When applied to a list of tactics {[T1;...;Tn]}, and a goal {g}, the tactical
{FIRST} tries applying the tactics to the goal until one succeeds. If the
first tactic which succeeds is {Tm}, then the effect is the same as just {Tm}.
Thus {FIRST} effectively behaves as follows:
{
   FIRST [T1;...;Tn] = T1 ORELSE ... ORELSE Tn
}
\FAILURE
The application of {FIRST} to a tactic list never fails. The resulting
tactic fails iff all the component tactics do when applied to the goal,
or if the tactic list is empty.

\SEEALSO
EVERY, ORELSE.

\ENDDOC