mirror
/
rustc-dev-guide
mirror of https://github.com/rust-lang/rustc-dev-guide.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

Document `#[rustc_default_body_unstable]`

This commit is contained in:
dianne 2024-09-16 20:20:46 -07:00 committed by nora
parent e3451dc015
commit c852d1c693
1 changed files with 10 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
src/stability.md
View File

@ -68,6 +68,16 @@ even on an `unstable` function, if that function is called from another
Furthermore this attribute is needed to mark an intrinsic as callable from
`rustc_const_stable` functions.
## rustc_default_body_unstable
The `#[rustc_default_body_unstable(feature = "foo", issue = "1234", reason =
"lorem ipsum")]` attribute has the same interface as the `unstable` attribute.
It is used to mark the default implementation for an item within a trait as
unstable.
A trait with a default-body-unstable item can be implemented stably by providing
an explicit body for any such item, or the default body can be used by enabling
its corresponding `#![feature]`.
## Stabilizing a library feature
To stabilize a feature, follow these steps: