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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 This section is about the stability attributes and schemes that allow stable APIs to use unstable
APIs internally in the rustc standard library. 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 # unstable
@ -14,14 +14,14 @@ reapplied. So if you apply this to a module, all items in the module will be uns
# stable # stable
The `#[stable(feature = "foo", "since = "1.420.69")]` attribute explicitly marks an item as 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). [Stabilizing Features](./stabilization_guide.md).
Note that stable functions may use unstable things in their body. Note that stable functions may use unstable things in their body.
# allow_internal_unstable # 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 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 `#[allow_internal_unstable(feature1, feature2)]` attribute that whitelists the given features for
usage in stable macros or `const fn`s. usage in stable macros or `const fn`s.