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Simon Peyton Jones authored
The proximate cause for this patch is Trac #13482, which pointed out further subtle interactions between - Inferring the most general type of a function - A partial type signature for that function That led me into /further/ changes to the shiny new stuff in TcSimplify.simplifyInfer, decideQuantification, decideMonoTyVars, and related functions. Happily, I was able to make some of it quite a bit simpler, notably the bit about promoting free tyvars. I'm happy with the result. Moreover I fixed Trac #13524 at the same time. Happy days.
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