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tcfail118.hs:10:29:
Overlapping instances for Eq Foo
arising from the 'deriving' clause of a data type declaration
Matching instances:
instance Eq Foo -- Defined at tcfail118.hs:11:25-26
instance Eq Foo -- Defined at tcfail118.hs:13:10-15
When deriving the instance for (Eq Bar)
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