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drvfail004.hs:8:12: error: [GHC-39999]
• Could not deduce ‘Eq (Foo a b)’
arising from the 'deriving' clause of a data type declaration
from the context: (Ord a, Ord b)
bound by the deriving clause for ‘Ord (Foo a b)’
at drvfail004.hs:8:12-14
Possible fix:
use a standalone 'deriving instance' declaration,
so you can specify the instance context yourself
• When deriving the instance for (Ord (Foo a b))
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