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tcfail143.hs:30:9: error:
• Couldn't match type ‘S Z’ with ‘Z’
arising from a functional dependency between:
constraint ‘MinMax (S Z) Z Z Z’ arising from a use of ‘extend’
instance ‘MinMax a Z Z a’ at tcfail143.hs:12:10-23
• In the expression: n1 `extend` n0
In an equation for ‘t2’: t2 = n1 `extend` n0
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