I think this Haskell version (pugs) came at a time when perl6-development was somewhat stuck, and it enabled the Perl 6 developers to test new language construc

I think this Haskell version (pugs) came at a time when perl6-development was somewhat stuck, and it enabled the Perl 6 developers to test new language constructs on an improved runtime (I believe); so Haskell was actually key to Perl 6 development. (https://gist.github.com/masak/479846/4908b28645b8815d1afe2b4d79efa164984b759c https://gist.github.com/masak/479846/4908b28645b8815d1afe2b4...)