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Auto merge of #23423 - nikomatsakis:issue-18737-trait-subtyping, r=nrc
This upcast coercion currently never requires vtable changes. It should be generalized. This is a [breaking-change] -- if you have an impl on an object type like `impl SomeTrait`, then this will no longer be applicable to object types like `SomeTrait+Send`. In the standard library, this primarily affected `Any`, and this PR adds impls for `Any+Send` as to keep the API the same in practice. An alternate workaround is to use UFCS form or standalone fns. For more details, see <#18737 (comment)>. r? @nrc
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