From ec40ee4c4eb6b105e67b7fb6a7a488d89a64fafb Mon Sep 17 00:00:00 2001 From: tiif Date: Wed, 30 Jul 2025 09:30:10 +0000 Subject: [PATCH 1/2] Add documentation for unstable_feature_bound --- src/doc/rustc-dev-guide/src/stability.md | 3 +++ 1 file changed, 3 insertions(+) diff --git a/src/doc/rustc-dev-guide/src/stability.md b/src/doc/rustc-dev-guide/src/stability.md index 230925252bac3..7a5efdb8ad72f 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 From 712c28e8324fc507c986f982755b8bfde919b5dc Mon Sep 17 00:00:00 2001 From: tiif Date: Wed, 30 Jul 2025 11:54:32 +0200 Subject: [PATCH 2/2] Remove space Co-authored-by: Tshepang Mbambo --- src/doc/rustc-dev-guide/src/stability.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/src/doc/rustc-dev-guide/src/stability.md b/src/doc/rustc-dev-guide/src/stability.md index 7a5efdb8ad72f..e8589b7f4310c 100644 --- a/src/doc/rustc-dev-guide/src/stability.md +++ b/src/doc/rustc-dev-guide/src/stability.md @@ -184,6 +184,6 @@ 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]`. +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