Migrate rustc_inferface queries

[pnkfelix]

Meeting proposal info

• Title: Migrate rustc_interface queries
• Type: technical
• Proposed by: pnkfelix, Zoxc
• Link: internals post
  • (aka PRs Turn HIR indexing into a query rust#59064, Turn HIR lowering into a query rust#59205, Turn macro expansion and name resolution into a query rust#59282, Turn parsing into a query rust#59338, Make ongoing_codegen a query rust#59404, Remove queries from rustc_interface rust#59904)
• Scheduled dates for discussion:
  • Not yet scheduled, we'll add content here when it gets scheduled

About this issue

This issue corresponds to a meeting proposal for the compiler team
steering meeting. It corresponds to a possible topic of
discussion. You can read more about the steering meeting procedure
here.

Comment policy

These issues are meant to be used as an "announcements channel"
regarding the proposal, and not as a place to discuss the technical
details. Feel free to subscribe to updates. We'll post comments when
reviewing the proposal in meetings or making a scheduling decision.
In the meantime, if you have questions or ideas, ping the proposers
on Zulip (or elsewhere).

[nikomatsakis]

We discussed this in today's planning meeting.

We decided to schedule this meeting for Oct 11 -- though since @Zoxc wasn't at the meeting, that was only tentative.

We also discussed how to help focus and guide the meeting agenda. The plan is for @pnkfelix to touch base with @Zoxc and to try and pick one specific PR or proposal to discuss. @pnkfelix can try to understand what is being proposed before-hand so that we can discuss it more as a group. Ideally, we would have pre-prepared a document (e.g., on hackmd) that documents the design and which can be later converted into a rustc-guide chapter. We should also aim, in the meeting, to talk about the downsides and whether this PR is a reasonable end-state or what kind of follow-up work we would want to do before we are comfortable leaving things as they are.

[nikomatsakis]

We wound up discussing something slightly different: PR #62038. We also decided to do a follow-up discussion to cover #60035, but I'll file an issue on that separately.

[nikomatsakis]

We've scheduled this for discussion on December 6.