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tcfail143.hs:29:9:
Couldn't match type `S Z' with `Z'
When using functional dependencies to combine
MinMax a Z Z a,
arising from the dependency `a b -> c d'
in the instance declaration at tcfail143.hs:11:10
MinMax (S Z) Z Z Z,
arising from a use of `extend' at tcfail143.hs:29:9-16
In the expression: n1 `extend` n0
In an equation for `t2': t2 = n1 `extend` n0
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