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Co-Authored-By: Mazdak Farrokhzad <twingoow@gmail.com>
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Oliver Scherer 2019-08-21 17:01:40 +02:00 committed by Who? Me?!
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# Stability
# Stability attributes
This section is about the stability attributes and schemes that allow stable APIs to use unstable
APIs internally in the rustc standard library.
For instructions on stabilizing a feature see [Stabilizing Features](./stabilization_guide.md).
For instructions on stabilizing a language feature see [Stabilizing Features](./stabilization_guide.md).
# unstable
@ -14,14 +14,14 @@ reapplied. So if you apply this to a module, all items in the module will be uns
# stable
The `#[stable(feature = "foo", "since = "1.420.69")]` attribute explicitly marks an item as
stabilized. In order to do this follow the instructions in
stabilized. To do this, follow the instructions in
[Stabilizing Features](./stabilization_guide.md).
Note that stable functions may use unstable things in their body.
# allow_internal_unstable
Macros, compiler desugarings and `const fn`s expose their bodies to the call site. In order to
Macros, compiler desugarings and `const fn`s expose their bodies to the call site. To
work around not being able to use unstable things in the standard library's macros, there's the
`#[allow_internal_unstable(feature1, feature2)]` attribute that whitelists the given features for
usage in stable macros or `const fn`s.