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Simon Peyton Jones authored
This patch simply deletes code, the SigTv check in occurCheckExpand. As the new comment says In the past we also rejected a SigTv matched with a non-tyvar But it is wrong to reject that for Givens; and SigTv is in any case handled separately by - TcUnify.checkTauTvUpdate (on-the-fly unifier) - TcInteract.canSolveByUnification (main constraint solver) (cherry picked from commit d25cb61a)
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