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SilentParametersOverlapping.hs:15:9:
Overlapping instances for C [(t0, t1)] arising from a use of `c'
Matching givens (or their superclasses):
(C [(a, b)])
bound by the instance declaration
at SilentParametersOverlapping.hs:14:37-45
Matching instances:
instance C [a] -- Defined at SilentParametersOverlapping.hs:11:10
(The choice depends on the instantiation of `t0, t1')
In the expression: c [(undefined, undefined)]
In an equation for `b': b x = c [(undefined, undefined)]
In the instance declaration for `B [(a, b)]'
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