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Add #![unstable_removed(..)] attribute to track removed features#153335

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Ozzy1423 wants to merge 1 commit intorust-lang:mainfrom
Ozzy1423:removed-features
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Add #![unstable_removed(..)] attribute to track removed features#153335
Ozzy1423 wants to merge 1 commit intorust-lang:mainfrom
Ozzy1423:removed-features

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@Ozzy1423 Ozzy1423 commented Mar 3, 2026

Adds the #![unstable_removed(..)] attribute to enable tracking removed library features.
Produce an error when a removed attribute is used.
Add a test that it works.

For #141617

r? @jyn514

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A-attributes Area: Attributes (`#[…]`, `#![…]`) A-rustc-dev-guide Area: rustc-dev-guide S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-libs Relevant to the library team, which will review and decide on the PR/issue.

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