# Backlog Bonanza YYYY-MM-DD

[GitHub query](https://github.com/rust-lang/rust/issues?q=is%3Aopen+label%3AC-tracking-issue+label%3AT-lang)

## What are we DOING?

* Take things that have been unstable for a while and "disposition them".
* Goal: Everything that is nightly only has one or more of the following labels, indicating the blocker(s) to stabilizing it:
* S-tracking-ready-to-stabilize: Needs a stabilization PR (good to go :train:)
* S-tracking-needs-to-bake: Needs time to bake (set a date? other criteria?)
* S-tracking-impl-incomplete: Not code complete or blocking bugs
* S-tracking-unimplemented: Implementation not begun
* S-tracking-design-concerns: Blocking design concerns
* This might be "doesn't quite seem to deliver value we hoped for" or "something doesn't feel right"
* S-tracking-perma-unstable
* Internal implementation detail of rustc, stdlib
* S-tracking-needs-investigation

Attendance: Josh, Felix, Scott, Mark

## Tracking Issue for try_trait_v2, A new design for the ? desugaring (RFC#3058) #84277

* A bunch of conversation around restructuring the trait hierarchy/design
* Some discussions with Jane + Mara on this
* https://github.com/rust-lang/rust/issues/84277#issuecomment-1066120333 has a concrete proposal
* https://github.com/rust-lang/rust/issues/84277#issuecomment-1078700107 is another version
* desugaring likely to stay approximately the same, but traits might change
* Design concerns, but mostly around finalizing the trait design, no major changes to the language semantic expected

## Tracking Issue for RFC 2528: type-changing struct update syntax #86555

* Implemented, no known blockers, marking as ready to stabilize (needs docs + stabilization report)

## Tracking issue: deref patterns #87121

* Somewhat active Zulip etc.
* impl-incomplete

## Tracking Issue for RFC 3137: let-else statements #87335

* Active work on the MIR/HIR parts, seems nearly there
* impl-incomplete for now though.

## Tracking Issue for #[track_caller] on closures #87417

* S-ready-to-stabilize

#![feature(closure_track_caller)]

fn foo() -> impl Fn() {
    #[track_caller] || { panic!(); }
}

fn main() {
    foo()()
}

I thought this worked, but no:

error[E0658]: attributes on expressions are experimental
 --> src/main.rs:2:13
  |
2 |     let x = #[inline] || ();
  |             ^^^^^^^^^
  |
  = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
  = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable

## Tracking Issue for "Overconstraining and omitting unsafe in impls of unsafe trait methods" (RFC 2316) #87919

https://github.com/rust-lang/rust/issues/87919

* No implementation
* [RFC 3245](https://github.com/rust-lang/rfcs/pull/3245) is an enhancement, but not coupling to this one

## Tracking Issue for RFC: Supertrait Item Shadowing #89151

https://github.com/rust-lang/rust/issues/89151

* Felix to bring up in compiler meeting

## Tracking Issue for deref_into_dyn_supertrait compatibility lint #89460

tracking issue for trait upcasting: https://github.com/rust-lang/rust/issues/65991

We think the lint probably needs movement/understanding before we can stabilize #65991, and also don't really recall seeing this lint discussed before.

## https://github.com/rust-lang/rust/issues/89554

* Ready to stabilize

## Tracking Issue for RFC #2972: Constrained Naked Functions #90957

PR for stabilization: https://github.com/rust-lang/rust/pull/93587

## Tracking Issue for static async fn in traits #91611

* implementation can proceed, but stabilization would be blocked on GATs.

## Tracking Issue for enabling elided_lifetimes_in_paths lints #91639