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T13154c.hs:16:1: error: [GHC-28323]
• Can't make a derived instance of
‘Foo1 a’ with the stock strategy:
The last argument of the instance must be a data or newtype application
• In the stand-alone deriving instance for ‘Foo1 a’
T13154c.hs:17:1: error: [GHC-00158]
• Can't make a derived instance of
‘Foo1 (# #)’ with the stock strategy:
‘Foo1’ is not a stock derivable class (Eq, Show, etc.)
• In the stand-alone deriving instance for ‘Foo1 (# #)’
T13154c.hs:18:1: error: [GHC-28323]
• Can't make a derived instance of
‘Foo1 a’ with the newtype strategy:
The last argument of the instance must be a data or newtype application
• In the stand-alone deriving instance for ‘Foo1 a’
T13154c.hs:19:1: error: [GHC-10333]
• Can't make a derived instance of
‘Foo1 (# #)’ with the newtype strategy:
GeneralizedNewtypeDeriving cannot be used on non-newtypes
• In the stand-alone deriving instance for ‘Foo1 (# #)’
T13154c.hs:22:1: error: [GHC-04956]
• Can't make a derived instance of ‘Foo2’ with the stock strategy:
Cannot derive instances for nullary classes
• In the stand-alone deriving instance for ‘Foo2’
T13154c.hs:23:1: error: [GHC-04956]
• Can't make a derived instance of
‘Foo2’ with the newtype strategy:
Cannot derive instances for nullary classes
• In the stand-alone deriving instance for ‘Foo2’
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