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drvfail013.hs:4:70: error:
• No instance for ‘Eq (m (Maybe a))’
arising from the 'deriving' clause of a data type declaration
Possible fix:
use a standalone 'deriving instance' declaration,
so you can specify the instance context yourself
• When deriving the instance for (Eq (MaybeT m a))
drvfail013.hs:6:70: error:
• No instance for ‘Eq (m (Maybe a))’
arising from the first field of ‘MaybeT'’ (type ‘m (Maybe a)’)
Possible fix:
use a standalone 'deriving instance' declaration,
so you can specify the instance context yourself
• When deriving the instance for (Eq (MaybeT' m a))
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