Lennart Kolmodin avatar Lennart Kolmodin committed b0bb818

Implement <?>

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Data/Attoparsec/Internal.hs

 (<?>) :: Parser a
       -> String                 -- ^ the name to use if parsing fails
       -> Parser a
-p <?> _msg = p
+p <?> msg = Parser $ \s kf ks -> runParser p s (\s' strs m -> kf s' (msg:strs) m) ks
 {-# INLINE (<?>) #-}
 infix 0 <?>
 
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