ffi & recursive data types

hi ... I'm new in ffi stuff and tools like greencard. Everything was working ok, until I wanted to: translate a haskell recursive data type(list,trees,etc) into a corresponding C type and back again. How can I do this? Thanks in advance saludos dario estepario ... ------------------------------------------------- Obtén tu correo en www.correo.unam.mx UNAMonos Comunicándonos