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[1 of 2] Compiling GFunctor ( GFunctor/GFunctor.hs, out_T5462No1/GFunctor.o )
[2 of 2] Compiling T5462No1 ( T5462No1.hs, out_T5462No1/T5462No1.o )
T5462No1.hs:25:42: error:
• Can't make a derived instance of ‘GFunctor F’:
‘GFunctor’ is not a stock derivable class (Eq, Show, etc.)
Try GeneralizedNewtypeDeriving for GHC's newtype-deriving extension
• In the newtype declaration for ‘F’
T5462No1.hs:27:23: error:
• Can't make a derived instance of ‘C1 G’:
‘C1’ is not a stock derivable class (Eq, Show, etc.)
Try enabling DeriveAnyClass
• In the data declaration for ‘G’
T5462No1.hs:28:23: error:
• Can't make a derived instance of ‘C2 H’:
‘C2’ is not a stock derivable class (Eq, Show, etc.)
Try enabling DeriveAnyClass
• In the data declaration for ‘H’
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