Curiously, if you define your own sub which takes a block, wantarray treats it as a normal routine: 
$ perl -wE 'sub f(&) { shift->() }; say f { wantarray }'
1

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I wonder if this inconsistency is worth a bug report.

Perl 6 - second systems done right

In reply to Re^2: Is map's sub block really being evaluated in list context? wantarray() returns undef.. by moritz
in thread Is map's sub block really being evaluated in list context? wantarray() returns undef.. by davido

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