[Haskell-cafe] greencard error message

greetings, greencard is confusing me: I copied an example from the command line and was hoping to look at some generated Haskell code to understand what's going on, but got this instead: | $ cat M1.gc | module M1 where | %enum PosixError Int [EACCES, ENOENT] | $ greencard M1.gc | greencard: user error (<unknown>, line <unknown>: | Don't know how to unmarshall (int res1) | | <unknown>, line <unknown>: | Don't know how to unmarshall (int res1) | | ) (is there any live code out there that i could use as an example to study? most of the links from haskell.org/greencard are dead. anybody agree to earlier comments that greencard is obsolete? i really like it so far and would be glad to hear otherwise.) thanks, mattias