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drvfail-foldable-traversable1.hs:9:23: error: [GHC-39999]
• No instance for ‘Functor Trivial1’
arising from the 'deriving' clause of a data type declaration
Possible fix:
use a standalone 'deriving instance' declaration,
so you can specify the instance context yourself
• When deriving the instance for (Traversable Trivial1)
drvfail-foldable-traversable1.hs:13:22: error: [GHC-39999]
• No instance for ‘Foldable Trivial2’
arising from the 'deriving' clause of a data type declaration
Possible fix:
use a standalone 'deriving instance' declaration,
so you can specify the instance context yourself
• When deriving the instance for (Traversable Trivial2)
drvfail-foldable-traversable1.hs:17:22: error: [GHC-16437]
• Can't make a derived instance of ‘Foldable Infinite’:
Constructor ‘Infinite’ must not contain function types
• In the data declaration for ‘Infinite’
drvfail-foldable-traversable1.hs:21:22: error: [GHC-16437]
• Can't make a derived instance of ‘Traversable (Cont r)’:
Constructor ‘Cont’ must not contain function types
• In the data declaration for ‘Cont’
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