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Tracking issue for Rust 2024: Match ergonomics rules 1C/2C #131414

Description

@traviscross

This is a tracking issue for reserving space in match ergonomics in Rust 2024 for RFC 3627 and other proposals for the future of match ergonomics.

Rules

  • Rule 1C: When the DBM (default binding mode) is not move (whether or not behind a reference), writing mut, ref, or ref mut on a binding is an error.
  • Rule 2C: Reference patterns can only match against references in the scrutinee when the DBM is move.

About tracking issues

Tracking issues are used to record the overall progress of implementation. They are also used as hubs connecting to other relevant issues, e.g., bugs or open design questions. A tracking issue is however not meant for large scale discussion, questions, or bug reports about a feature. Instead, open a dedicated issue for the specific matter and add the relevant feature gate label.

Steps

Tracking for broader RFC 3627 work:

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    A-edition-2024Area: The 2024 editionA-patternsRelating to patterns and pattern matchingB-RFC-approvedBlocker: Approved by a merged RFC but not yet implemented.C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCS-tracking-ready-for-editionStatus: This issue is ready for inclusion in the edition.T-langRelevant to the language team

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