Please test your code before you offer it as a solution: 
$ perl -wE 'my $t = sub { uc(@_)}; say $t->("foo")'
1

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uc has a prototype which forces scalar context, so uc(@_) evaluates to the number of elements in @ (upper-cased).

Perl 6 - links to (nearly) everything that is Perl 6.

In reply to Re: Answer: How do I get a reference to a builtin function? by moritz
in thread How do I get a reference to a builtin function? by adram

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