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| author | tiif <pekyuan@gmail.com> | 2025-07-30 09:30:10 +0000 |
|---|---|---|
| committer | tiif <pekyuan@gmail.com> | 2025-07-30 09:30:10 +0000 |
| commit | ec40ee4c4eb6b105e67b7fb6a7a488d89a64fafb (patch) | |
| tree | 29d15e22c733edfd759aa20f42e4bc3e9e5c4a5a | |
| parent | 72716b134ac26b837703e46cbda99a453ae92c42 (diff) | |
| download | rust-ec40ee4c4eb6b105e67b7fb6a7a488d89a64fafb.tar.gz rust-ec40ee4c4eb6b105e67b7fb6a7a488d89a64fafb.zip | |
Add documentation for unstable_feature_bound
| -rw-r--r-- | src/doc/rustc-dev-guide/src/stability.md | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/src/doc/rustc-dev-guide/src/stability.md b/src/doc/rustc-dev-guide/src/stability.md index 230925252ba..7a5efdb8ad7 100644 --- a/src/doc/rustc-dev-guide/src/stability.md +++ b/src/doc/rustc-dev-guide/src/stability.md @@ -183,4 +183,7 @@ the `deprecated_in_future` lint is triggered which is default `allow`, but most of the standard library raises it to a warning with `#![warn(deprecated_in_future)]`. +## unstable_feature_bound +The `#[unstable_feature_bound(foo)]` attribute can be used together with `#[unstable]` attribute to mark an `impl` of stable type and stable trait as unstable. In std/core , an item annotated with `#[unstable_feature_bound(foo)]` can only be used by another item that is also annotated with `#[unstable_feature_bound(foo)]`. Outside of std/core, using an item with `#[unstable_feature_bound(foo)]` requires the feature to be enabled with `#![feature(foo)]` attribute on the crate. Currently, only `impl`s and free functions can be annotated with `#[unstable_feature_bound]`. + [blog]: https://www.ralfj.de/blog/2018/07/19/const.html |