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tcfail157.hs:27:10:
Variable occurs more often in a constraint than in the instance head
in the constraint: E m a b
(Use -XUndecidableInstances to permit this)
In the instance declaration for `Foo m (a -> ())'
tcfail157.hs:27:10:
Variable occurs more often in a constraint than in the instance head
in the constraint: Foo m b
(Use -XUndecidableInstances to permit this)
In the instance declaration for `Foo m (a -> ())'
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