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clarify the role of rustc_const_unstable

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Ralf Jung 2024-08-22 16:40:33 +02:00 committed by Oli Scherer
parent 45e3b9d6b2
commit 7a37519254
1 changed files with 5 additions and 5 deletions
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10
src/stability.md
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@ -49,11 +49,11 @@ marks an item as stabilized. Note that stable functions may use unstable things
## rustc_const_unstable
The `#[rustc_const_unstable(feature = "foo", issue = "1234", reason = "lorem ipsum")]`
has the same interface as the `unstable` attribute. It is used to mark
`const fn` as having their constness be unstable. This allows you to make a
function stable without stabilizing its constness or even just marking an existing
stable function as `const fn` without instantly stabilizing the `const fn`ness.
The `#[rustc_const_unstable(feature = "foo", issue = "1234", reason = "lorem
ipsum")]` has the same interface as the `unstable` attribute. It is used to mark
`const fn` as having their constness be unstable. Every `const fn` with
stability attributes should carry either this attribute or
`#[rustc_const_stable]` (see below).
Furthermore this attribute is needed to mark an intrinsic as `const fn`, because
there's no way to add `const` to functions in `extern` blocks for now.