A list (which is what your constant sub returns) isn't an array.

Update: Perhaps this will help. Remember what a LIST in scalar context evaluates as. 

perl5.10.0 -E'BEGIN{ sub X () { say "wantarray: ", defined wantarray ?
+ (wantarray eq "" ? "empty" : wantarray) : "undef"; qw(a b c) } } say
+ "ok" if "a" ~~ X'

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The cake is a lie.
The cake is a lie.
The cake is a lie.

In reply to Re: 5.10 smart match behaviour by Fletch
in thread 5.10 smart match behaviour by zgrim

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