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=item :dump_to_stdout

This signals that the code should be printed to STDOUT as the source
filter runs. This is useful primarily to see what the source filter
actually does, for debugging, or if you want to capture the transformed
code so it can be used B<without> needing Acme::Sub::Parms to be
installed at all.

This would typically be used by setting the flag on the
'use Acme::Sub::Parms', and then running 
  perl -c sourcefile > outputfile
(with 'sourcefile' and 'outputfile' replaced with the appropriate
filenames).

=back

=head1 Parameter Binding and Validation

A syntax is available to perform argument validation. This is both fast
and powerful, but has some caveats.

The basic format is as follows