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drvfail004.hs:8:12:
No instance for (Eq (Foo a b))
arising from the 'deriving' clause of a data type declaration
Possible fix:
add an instance declaration for (Eq (Foo a b))
or 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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