Perl 6 for Perl 5: Revision 7
v6 brings Perl 6 to perl (the Perl 5 interpreter) in the form of a source filter.
Perl 6 features are also coming to Perl 5 in other ways. As described below, a number of Perl 5 modules already implement some Perl 6 features, and some aspects of Perl 6 are being added to the official Perl 5 releases, starting with Perl 5.10.
Perl 5 modules implementing Perl 6 features