How is this different to Clean? (a much older Haskell/research variant, see http://wiki.clean.cs.ru.nl/Clean )
Haskell first appeared 2/3 years after Clean. The right description is more like 'Haskell and Clean are the twin Free offspring of the lazy FP language Miranda, which unfortunately was proprietary; they both have different but related approaches to being pure'.
Ok, didn't realize that timing. There is a Haskell/Clean crosscompiler I believe too.