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tcfail170.hs:7:10: error:
Illegal instance declaration for ‘C [p] [q]’
The coverage condition fails in class ‘C’
for functional dependency: ‘a -> b’
Reason: lhs type ‘[p]’ does not determine rhs type ‘[q]’
Un-determined variable: q
In the instance declaration for ‘C [p] [q]’
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