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))