-<?> :: (Parser a b) String -> Parser a b
-<?> p e = Parser \i -> case runParser p i of
- (Left e1, rest) = (Left (e1+(Expected [e])), rest)
+//Try the parser, if it fails decorate the error with Expected of the given String and position
+(<?>) :: (Parser a b) (String, Int) -> Parser a b
+(<?>) p (e,pos) = Parser \i -> case runParser p i of
+ (Left e1, rest) = let error = (e1+(Expected [e] pos)) in (Left error, rest)