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MonadFail for Matcher

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Timothy Clem 2018-10-31 08:28:22 -07:00
parent a0643b725a
commit 3e26d933b3
1 changed files with 3 additions and 0 deletions
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3
src/Control/Matching.hs
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@ -55,6 +55,9 @@ instance Alternative (Matcher t) where
instance Monad (Matcher t) where
(>>=) = Then
instance MonadFail (Matcher t) where
fail _ = Empty
-- | This matcher always succeeds.
succeeds :: Matcher t ()
succeeds = guard True