Description
This is a tracking issue for the RFC "3086" (rust-lang/rfcs#3086).
The feature gate for the issue is #![feature(macro_metavar_expr)].
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
- Implement the RFC (cc @markbt -- has there been work done here already?)
- Adjust documentation (see instructions on rustc-dev-guide)
- Stabilization PR (see instructions on rustc-dev-guide)
Unresolved questions and bugs
Implementation history
- 2022-02-25, [1/2] Implement macro meta-variable expressions
- 2022-03-11, [2/2] Implement macro meta-variable expressions
- 2022-03-12, Fix remaining meta-variable expression TODOs
- 2019-03-21, [macro-metavar-expr] Fix generated tokens hygiene
- 2022-04-07, Kickstart the inner usage of macro_metavar_expr
- 2022-04-07, [macro_metavar_expr] Add tests to ensure the feature requirement
- 2023-05-24, [RFC-3086] Restrict the parsing of
count - 2023-10-22, [RFC 3086] Attempt to try to resolve blocking concerns