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Mention rustc's stable-item-through-unstable-path bug being fixed #2064

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Sep 24, 2024
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Mention rustc's stable-item-through-unstable-path bug being fixed #2064

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10 changes: 6 additions & 4 deletions src/stability.md
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Expand Up @@ -30,10 +30,11 @@ them. The stability scheme works similarly to how `pub` works. You can have
public functions of nonpublic modules and you can have stable functions in
unstable modules or vice versa.

Note, however, that due to a [rustc bug], stable items inside unstable modules
*are* available to stable code in that location! So, for example, stable code
can import `core::intrinsics::transmute` even though `intrinsics` is an
unstable module. Thus, this kind of nesting should be avoided when possible.
Previously, due to a [rustc bug], stable items inside unstable modules were
available to stable code in that location.
As of <!-- date-check --> September 2024, items with [accidentally stabilized
paths] are marked with the `#[rustc_allowed_through_unstable_modules]` attribute
to prevent code dependent on those paths from breaking.

The `unstable` attribute may also have the `soft` value, which makes it a
future-incompatible deny-by-default lint instead of a hard error. This is used
Expand All @@ -42,6 +43,7 @@ prevents breaking dependencies by leveraging Cargo's lint capping.

[issue number]: https://github.com/rust-lang/rust/issues
[rustc bug]: https://github.com/rust-lang/rust/issues/15702
[accidentally stabilized paths]: https://github.com/rust-lang/rust/issues/113387

## stable
The `#[stable(feature = "foo", since = "1.420.69")]` attribute explicitly
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