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--- BNF Converter: Error Monad
--- Copyright (C) 2004 Author: Aarne Ranta
-
--- This file comes with NO WARRANTY and may be used FOR ANY PURPOSE.
-module GF.JavaScript.ErrM where
-
--- the Error monad: like Maybe type with error msgs
-
-data Err a = Ok a | Bad String
- deriving (Read, Show, Eq)
-
-instance Monad Err where
- return = Ok
- fail = Bad
- Ok a >>= f = f a
- Bad s >>= f = Bad s