Tactic IfThenElse
Tactic Notation
"if" tactic(t)
"then" tactic(t1)
"else" tactic(t2) :=
first [ t; first [ t1 | fail 2 ] | t2 ].if t then t1 else t2 is equivalent to t; t1 if t does not fail and is equivalent to t2 otherwise.
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