Tracking Issue for Generic Constant Arguments MVP

[camelid]

This is a tracking issue for the prototype described in rust-lang/rust-project-goals#100.
The feature gate for the issue is #![feature(min_generic_const_args)].

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.
Discussion comments will get marked as off-topic or deleted.
Repeated discussions on the tracking issue may lead to the tracking issue getting locked.

Steps

• Add ConstArgKind::Path
• Use ConstArgKind::Path for all single-segment paths
• Use ConstArgKind::Path for all paths
• Implement support for
  • Support ConstArgKind::Paths for const struct/variant constructors #132985
  • Support ConstArgKind::Path for uses of static paths #132986
• Adjust documentation (see instructions on rustc-dev-guide)
• Stabilization PR (see instructions on rustc-dev-guide)

Unresolved Questions

TODO

Implementation history

• Represent type-level consts with new-and-improved hir::ConstArg #125915
• Fix anon const def-creation when macros are involved #129137
• Use ConstArgKind::Path for all single-segment paths, not just params under min_generic_const_args #131081