Defer mapped type indexed access transformations#18042
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This was referenced Aug 25, 2017
mhegazy
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Aug 25, 2017
This was referenced Aug 25, 2017
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With this PR we defer certain mapped type indexed access transformations. Previously, we'd eagerly transform an indexed access of the form
{ [P in K]: T}[X]into an instantiation ofTwhereXis substituted for every occurrence ofP. We now keep the original form and instead perform the transformation as we obtain the constraint of the indexed access.Fixes #15756.