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tcfail118.hs:10:29: error:
• Overlapping instances for Eq Foo
arising from the first field of ‘Bar’ (type ‘Foo’)
Matching instances:
instance Eq Foo -- Defined at tcfail118.hs:13:10
instance Eq Foo -- Defined at tcfail118.hs:11:25
• When deriving the instance for (Eq Bar)
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