Perl 6 Parameter Passing on O'Reilly.
"Perl 6 is not finished, but you can already play with it. I hope this article will encourage you to try it. Begin by installing Pugs, a Perl 6 compiler implemented in Haskell. Note that you will also need Haskell (see directions in the Pugs INSTALL file for how to get it).
Of course, Pugs is not finished. It couldn't be. The Perl 6 design is still in progress. However, Pugs still has many key features that are going to turn our favorite language into something even greater.
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