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don't create hints for errors without messages

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mrkkrp 2015-08-26 16:45:09 +06:00
parent 49e80775ef
commit 89f34688ab
1 changed files with 3 additions and 2 deletions
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Text/Megaparsec/Prim.hs
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@ -163,8 +163,9 @@ newtype Hints = Hints [[String]] deriving Monoid
-- | Convert 'ParseError' record into 'Hints'.
toHints :: ParseError -> Hints
toHints err = Hints [messageString <$> msgs]
where msgs = filter ((== 1) . fromEnum) $ errorMessages err
toHints err = Hints hints
where hints = if null msgs then [] else [messageString <$> msgs]
msgs = filter ((== 1) . fromEnum) $ errorMessages err
-- | @withHints hs c@ makes “error” continuation @c@ use given hints @hs@.