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T9600.hs:4:39: error:
• Can't make a derived instance of ‘Applicative Foo’:
‘Applicative’ 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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