check wf of existential projections #77186
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this PR isn't really relevant anymore now that #73905 has been merged afaict. |
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I think this would mostly fix #27675
We don't look into trait objects in hrtb which might still need to be fixed.
It also looks like #73905 will make this unnecessary, so not sure if we should go ahead here.
r? @nikomatsakis @matthewjasper