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T10598_fail2.hs:5:37: error:
• Can't make a derived instance of
‘Eq A’ with the anyclass strategy:
Try enabling DeriveAnyClass
• In the data declaration for ‘A’
T10598_fail2.hs:6:37: error:
• Can't make a derived instance of
‘Eq B’ with the newtype strategy:
Try GeneralizedNewtypeDeriving for GHC's newtype-deriving extension
• In the newtype declaration for ‘B’
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