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Don’t let MonadZero imply its deprecation warning #68

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merged 4 commits into from
Dec 8, 2020
Merged

Don’t let MonadZero imply its deprecation warning #68

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aac34f3
Don’t let MonadZero imply its deprecation warning
kl0tl Dec 6, 2020
1ef1d12
Rename Deprecated to DeprecatedMonadZero
JordanMartinez Dec 7, 2020
9fc35f0
Rename DeprecatedMonadZero to MonadZeroIsDeprecated
JordanMartinez Dec 8, 2020
34b5229
Merge branch 'master' into no-warn-superclass
thomashoneyman Dec 8, 2020
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8 changes: 6 additions & 2 deletions src/Control/MonadZero.purs
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Original file line number Diff line number Diff line change
Expand Up @@ -9,7 +9,8 @@
-- | Use `Monad` and `Alternative` constraints instead.

module Control.MonadZero
( class MonadZero
( class MonadZeroIsDeprecated
, class MonadZero
, module Control.Alt
, module Control.Alternative
, module Control.Applicative
Expand All @@ -32,13 +33,16 @@ import Data.Functor (class Functor, map, void, ($>), (<#>), (<$), (<$>))

import Prim.TypeError (class Warn, Text)

class MonadZeroIsDeprecated
instance monadZeroIsDeprecated :: Warn (Text "'MonadZero' is deprecated, use 'Monad' and 'Alternative' constraints instead") => MonadZeroIsDeprecated

-- | The `MonadZero` type class has no members of its own; it just specifies
-- | that the type has both `Monad` and `Alternative` instances.
-- |
-- | Types which have `MonadZero` instances should also satisfy the following
-- | laws:
-- |
-- | - Annihilation: `empty >>= f = empty`
class (Monad m, Alternative m, Warn (Text "'MonadZero' is deprecated, use 'Monad' and 'Alternative' constraints instead")) <= MonadZero m
class (Monad m, Alternative m, MonadZeroIsDeprecated) <= MonadZero m

instance monadZeroArray :: MonadZero Array