X-Git-Url: https://git.martlubbers.net/?a=blobdiff_plain;f=src%2Fyard.dcl;h=dff75d9121bccd959425a05236d9bc7917ea9e6a;hb=43d45105726b3ad3e5cc5165f8c9b066ec8d2790;hp=76b6c17e33ebe664c137e4523a05dc5a6a0a96f1;hpb=b4636110ab65f233ed40d4390b62c7799df3c949;p=cc1516.git

diff --git a/src/yard.dcl b/src/yard.dcl
index 76b6c17..dff75d9 100644
--- a/src/yard.dcl
+++ b/src/yard.dcl
@@ -7,7 +7,7 @@ from Data.Functor import class Functor
 from Control.Monad import class Monad
 from Control.Applicative import class Applicative, class Alternative
 
-:: Error = ParseError | LexError String
+:: Error = ParseError | LexError String | Unexpected String Int
 :: Parser a b = Parser ([a] -> (Either Error b, [a]))
 
 instance Functor (Parser a)
@@ -18,6 +18,7 @@ instance Alternative (Parser a)
 instance toString Error
 
 runParser :: (Parser a b) [a] -> (Either Error b, [a])
+(<?>) :: (Parser a b) (String, Int) -> Parser a b
 fail :: Parser a b
 top :: Parser a a
 satisfy :: (a -> Bool) -> Parser a a