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Simon Peyton Jones authored
Trac #13879 showed that when we were trying to solve (forall z1 (y1::z1). ty1) ~ (forall z2 (y2:z2). ty2) we'd end up spitting out z1~z2 with no binding site for them. Those kind equalities need to be inside the implication. I ended up re-factoring the code for solving forall-equalities. It's quite nice now.
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