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WCompatWarningsOn.hs:11:5: warning:
• Could not deduce (MonadFail m)
arising from the failable pattern ‘Just _’
(this will become an error a future GHC release)
from the context: Monad m
bound by the type signature for:
monadFail :: Monad m => m a
at WCompatWarningsOn.hs:9:1-27
Possible fix:
add (MonadFail m) to the context of
the type signature for:
monadFail :: 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 }
WCompatWarningsOn.hs:14:1: warning:
Local definition of ‘<>’ clashes with a future Prelude name.
This will become an error in a future release.
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