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fd-loop.hs:12:10:
Variable occurs more often in a constraint than in the instance head
in the constraint: C a b
(Use -XUndecidableInstances to permit this)
In the instance declaration for `Eq (T a)'
fd-loop.hs:12:10:
Variable occurs more often in a constraint than in the instance head
in the constraint: Eq b
(Use -XUndecidableInstances to permit this)
In the instance declaration for `Eq (T a)'
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