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Describe laws for NonDet #317

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Describe laws for NonDet #317

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13 changes: 9 additions & 4 deletions effectful-core/src/Effectful/Internal/Monad.hs
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Expand Up @@ -287,10 +287,15 @@ instance MonadFix (Eff es) where
----------------------------------------
-- NonDet

-- | Provide the ability to use the 'Alternative' and 'MonadPlus' instance for
-- 'Eff'.
--
-- @since 2.2.0.0
{-| Provide the ability to use the 'Alternative' and 'MonadPlus' instance for
'Eff'.

'NonDet' does not backtrack. Formally, it obeys the "left-catch" law for 'MonadPlus',
rather than the "left-distribution" law. This means that it behaves more like 'Maybe'
than '[]'.

@since 2.2.0.0
-}
data NonDet :: Effect where
Empty :: NonDet m a
(:<|>:) :: m a -> m a -> NonDet m a
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