rustc-dev-guide: add note about not adding rustc_allowed_through_unstable_modules to more items

This commit is contained in:
Ralf Jung 2025-01-14 17:00:12 +01:00
parent 92984b2723
commit 1cd70aaa2c
1 changed files with 2 additions and 1 deletions

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@ -34,7 +34,8 @@ 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.
to prevent code dependent on those paths from breaking. Do *not* add this attribute
to any more items unless that is needed to avoid breaking changes.
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