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drvfail-functor2.hs:2:29: warning: [-Wdeprecated-flags (in -Wdefault)]
-XDatatypeContexts is deprecated: It was widely considered a misfeature, and has been removed from the Haskell language.
drvfail-functor2.hs:8:14: error:
• Can't make a derived instance of ‘Functor InFunctionArgument’:
Constructor ‘InFunctionArgument’ must not use the type variable in a function argument
• In the newtype declaration for ‘InFunctionArgument’
drvfail-functor2.hs:11:14: error:
• Can't make a derived instance of ‘Functor OnSecondArg’:
Constructor ‘OnSecondArg’ must use the type variable only as the last argument of a data type
• In the newtype declaration for ‘OnSecondArg’
drvfail-functor2.hs:16:14: error:
• Cannot derive well-kinded instance of form ‘Functor (NoArguments ...)’
Class ‘Functor’ expects an argument of kind ‘* -> *’
• In the newtype declaration for ‘NoArguments’
drvfail-functor2.hs:21:14: error:
• Can't make a derived instance of ‘Functor StupidConstraint’:
Data type ‘StupidConstraint’ must not have a class context: Eq a
• In the data declaration for ‘StupidConstraint’
drvfail-functor2.hs:27:14: error:
• No instance for (Functor NoFunctor)
arising from the first field of ‘UseNoFunctor’ (type ‘NoFunctor a’)
Possible fix:
use a standalone 'deriving instance' declaration,
so you can specify the instance context yourself
• When deriving the instance for (Functor UseNoFunctor)
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