[Haskell] [Haskell - I/O] Problem with 'readFile'

Hi, I use the operation 'readFile' for obtain information locates on a file. When I try to write another information on the same file, I obtain this error message: "openFile: permision denied". I found this: "The readFile operation holds a semi-closed handle on the file until the entire contents o

[Haskell] Exists any null instruction in Haskell?

Hi, I want to know if it exists a null instruction (a instruction that do anything, for stop the recursivity of a function, for exemple) in Haskell. Thanks you. ___ Haskell mailing list Haskell@haskell.org http://www.haskell.org/mailman/listinfo/haskell