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authoraarne <aarne@cs.chalmers.se>2008-06-25 16:43:48 +0000
committeraarne <aarne@cs.chalmers.se>2008-06-25 16:43:48 +0000
commitb96b36f43de3e2f8b58d5f539daa6f6d47f25870 (patch)
tree0992334be13cec6538a1dea22fbbf26ad6bdf224 /src/GF/Source/ErrM.hs
parentfe367412e0aeb4ad5c02de68e6eca382e0f96984 (diff)
removed src for 2.9
Diffstat (limited to 'src/GF/Source/ErrM.hs')
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diff --git a/src/GF/Source/ErrM.hs b/src/GF/Source/ErrM.hs
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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.Source.ErrM where
-
--- the Error monad: like Maybe type with error msgs
-
-import Control.Monad (MonadPlus(..), liftM)
-
-data Err a = Ok a | Bad String
- deriving (Read, Show, Eq, Ord)
-
-instance Monad Err where
- return = Ok
- fail = Bad
- Ok a >>= f = f a
- Bad s >>= f = Bad s
-
-instance Functor Err where
- fmap = liftM
-
-instance MonadPlus Err where
- mzero = Bad "Err.mzero"
- mplus (Bad _) y = y
- mplus x _ = x