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drvfail007.hs:4:38: error:
No instance for (Eq (Int -> Int))
arising from the first field of ‘Foo’ (type ‘Int -> Int’)
(maybe you haven't applied a function to enough arguments?)
Possible fix:
use a standalone 'deriving instance' declaration,
so you can specify the instance context yourself
When deriving the instance for (Eq Foo)
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