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instead of executing the block it controls, it...well...doesn't.

Regardless of the contents of the block, C<don't> returns C<undef>.

You can even write:

    don't {
        # code here
    } while condition();

And, yes, in strict analogy to the semantics of Perl's magical
C<do...while>, the C<don't...while> block is I<unconditionally>
not done once before the test. ;-)

Note that the code in the C<don't> block must be syntactically valid
Perl.  This is an important feature: you get the accelerated
performance of not actually executing the code, without sacrificing
the security of compile-time syntax checking.

=head1 LIMITATIONS