Trait upcasting coercion (part1)#86264
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bors merged 4 commits intorust-lang:masterfrom Jul 31, 2021
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This revives the first part of earlier PR #60900 .
It's not very clear to me which parts of that pr was design decisions, so i decide to cut it into pieces and land them incrementally. This allows more eyes on the details.
This is the first part, it adds feature gates, adds feature gates tests, and implemented the unsize conversion part.
(I hope i have dealt with the
ExistentialTraitRefvalues correctly...)The next part will be implementing the pointer casting.