syntax - Why doesn't PatternTest work with Composition?

While playing around with the solutions to this question, I've found some very strange behaviour:

MatchQ[3,_?Composition[Not,OptionQ]]
(*
==> False
*)
MatchQ[3,_?(Not[OptionQ[#]]&)]
(*
==> True

*)
Composition[Not,OptionQ][3]
(*
==> True
*)

So what's wrong with the first pattern? Or did I just find some bug?

Answer

Because PatternTest binds very tightly. You need extra parentheses:

MatchQ[3, _?(Composition[Not, OptionQ])]

Comments

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