Move transfer into the GF repo.

src/Transfer/ErrM.hs

@@ -0,0 +1,16 @@
+-- BNF Converter: Error Monad
+-- Copyright (C) 2004  Author:  Aarne Ranta
+
+-- This file comes with NO WARRANTY and may be used FOR ANY PURPOSE.
+module Transfer.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