Tracking issue for RFC 3617 precise capturing of types

[traviscross]

The feature gate for the issue is #![feature(precise_capturing_of_types)].

This tracking issue covers extending the precise_capturing feature to allow for the partial capturing of type and const generic parameters.

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

• Accept an RFC.
  • Precise capturing rfcs#3617
• Stabilize precise capturing syntax and precise capturing of lifetimes.
  • Tracking issue for precise_capturing syntax #123432
• Implement in nightly.
• Add documentation to the dev guide.
  • See the instructions.
• Add documentation to the reference.
  • See the instructions.
• Add formatting for new syntax to the style guide.
  • See the nightly style procedure.
• Stabilize.
  • See the instructions.

Unresolved Questions

TODO.

Related

TODO.

cc @compiler-errors

[nikomatsakis]

I had added an example in #130031 (which I closed in favor of this issue)

[workingjubilee]

Because I thought I was seeing double for a moment, for future reference, these two issues are related for obvious reasons, but currently...

• Tracking issue for RFC 3617 precise capturing of types #130043 <- YOU ARE HERE
• Tracking issue for RFC 3617 precise capturing in traits #130044