The Haskell 98 Report says that fail in instance Monad IO invokes error.
The Library Report says that fail in instance Monad IO raises a user error.
I would let it raise a user error, to be able to use fail in exception
monads where strings suffice as the error type.
--
__("< Marcin Kowalczyk * [EMAIL PROTECTED] http://qrczak.ids.net.pl/
\__/
^^ SYGNATURA ZASTÊPCZA
QRCZAK
_______________________________________________
Haskell mailing list
[EMAIL PROTECTED]
http://www.haskell.org/mailman/listinfo/haskell
