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Template.hs:9:5: warning: [-Wmissing-monadfail-instances (in -Wcompat)]
• Could not deduce (Control.Monad.Fail.MonadFail m)
arising from the failable pattern ‘Just _’
(this will become an error in a future GHC release)
from the context: Monad m
bound by the type signature for:
monadFail :: forall (m :: * -> *) a. Monad m => m a
at Template.hs:7:1-27
Possible fix:
add (Control.Monad.Fail.MonadFail m) to the context of
the type signature for:
monadFail :: forall (m :: * -> *) a. Monad m => m a
• In a stmt of a 'do' block: Just _ <- undefined
In the expression:
do Just _ <- undefined
undefined
In an equation for ‘monadFail’:
monadFail
= do Just _ <- undefined
undefined
Template.hs:12:1: warning: [-Wsemigroup (in -Wcompat)]
Local definition of ‘<>’ clashes with a future Prelude name.
This will become an error in a future release.
Template.hs:18:3: warning: [-Wnoncanonical-monoid-instances (in -Wcompat)]
Noncanonical ‘(<>) = mappend’ definition detected
in the instance declaration for ‘Semigroup S’.
Move definition from ‘mappend’ to ‘(<>)’
Template.hs:21:3: warning: [-Wnoncanonical-monoid-instances (in -Wcompat)]
Noncanonical ‘mappend’ definition detected
in the instance declaration for ‘Monoid S’.
Define as ‘mappend = (<>)’
Template.hs:25:15: warning: [-Wstar-is-type (in -Wcompat)]
Using ‘*’ (or its Unicode variant) to mean ‘Data.Kind.Type’
relies on the StarIsType extension, which will become
deprecated in the future.
Suggested fix: use ‘Type’ from ‘Data.Kind’ instead.
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