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readFail039.hs:9:14: error: [GHC-82023]
• Can't make a derived instance of ‘C Foo’:
‘C’ is not a stock derivable class (Eq, Show, etc.)
• In the newtype declaration for ‘Foo’
Suggested fix:
Perhaps you intended to use GeneralizedNewtypeDeriving
for GHC's newtype-deriving extension
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