This issue is part of #54503. It is specifically focused on implementing the #[expect] attribute for lints.

A working lint implementation can be found in #87835. The implementation still left the to-dos open for follow-up PRs:

• Handle #[expect(unfulfilled_lint_expectations)] -- Improve expect impl and handle #[expect(unfulfilled_lint_expectations)] (RFC 2383) #94670
• Update unstable expectation ids in HandlerInner::stashed_diagnostics -- Improve expect impl and handle #[expect(unfulfilled_lint_expectations)] (RFC 2383) #94670
• Make #[expect()] work for rustdoc:: lints Support tool lints with the #[expect] attribute (RFC 2383) #95542
• ICE: no warnings or errors encountered even though delayed_good_path_bugs issued #![feature(lint_reasons)] #95540
• #[expect(..)] not supported on function arguments #97650
• Handle --force-warn with expect (Support lint expectations for --force-warn lints (RFC 2383) #97757)
• #[expect(...)] doen't catch lints from different check_* function #97660
• Make confusable_idents work with #[expect] currently, the lint is emitted and doesn't fulfill the expectation.
• Update unstable documentation to reflect this change.

The open questions will be asked in the RFC Tracking issue 🙃