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| author | bors <bors@rust-lang.org> | 2015-03-17 13:29:48 +0000 |
|---|---|---|
| committer | bors <bors@rust-lang.org> | 2015-03-17 13:29:48 +0000 |
| commit | c64d671671aea2e44ee7fc6eb00ee75fc30ed7b9 (patch) | |
| tree | 058ec26f2e5ae48d415b7730c5f2d51df9b369a0 /src/doc/intro.md | |
| parent | 31ba21228e0e539a665ce14ab3a176e30e57f822 (diff) | |
| parent | 277b4f035aa7e42330aabbc243a8fcb5cf4cc8bd (diff) | |
| download | rust-c64d671671aea2e44ee7fc6eb00ee75fc30ed7b9.tar.gz rust-c64d671671aea2e44ee7fc6eb00ee75fc30ed7b9.zip | |
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 <https://github.com/rust-lang/rust/issues/18737#issuecomment-78450798>. r? @nrc
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