1.67 regression with `……::{opaque#0}<'_> does not live long enough` error

[steffahn]

Discussed in https://users.rust-lang.org/t/rust-1-67-lifetime-error-compiles-with-1-66-what-changed/88483 and described on zotero/citeproc-rs#154. I can reproduce a regression in 1.67.0 using the current latest commit “2ab195a1e6f84f0ff284813ece61dc62096abbfe” in the zotero/citeproc-rs repo.

This issue was first incorrectly thought of as a sort of “duplicate” of #107426, since that issue originally claimed a 1.67 regression, too, but actually regressed in 1.66, and on a deliberate soundness fix (#95474).

However, bisection of the above-mentioned commit on citeproc-rs points to a different PR, that is

• Support using Self or projections inside an RPIT/async fn #103491

Glancing at it, that PR does not look like it’s supposed to break anything. @rustbot label regression-from-stable-to-stable, T-compiler, E-needs-mcve

Compilation error

error: `QuoteSplitter<'_, impl Iterator<Item = (usize, char)> + '_>::events::{opaque#0}<'_>` does not live long enough
   --> crates/io/src/output/parse_quotes.rs:419:47
    |
419 |                 | MicroNode::Formatted(..) => EachSplitter::Index(Some(ix)),
    |                                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: `QuoteSplitter<'_, impl Iterator<Item = (usize, char)> + '_>::events::{opaque#0}<'_>` does not live long enough
   --> crates/io/src/output/parse_quotes.rs:430:21
    |
430 | /                     EachSplitter::Splitter {
431 | |                         index: ix,
432 | |                         splitter,
433 | |                         seen_any: Some(false),
434 | |                     }
    | |_____________________^

error: could not compile `citeproc-io` due to 2 previous errors

bisection

searched toolchains a28f3c88e50a77bc2a91889241248c4543854e61 through b7bc90fea3b441234a84b49fdafeb75815eebbab


********************************************************************************
Regression in 7fe6f36224e92db6fbde952e0b7e50863161f6ee
********************************************************************************

==================================================================================
= Please file this regression report on the rust-lang/rust GitHub repository     =
=        New issue: https://github.com/rust-lang/rust/issues/new                 =
=     Known issues: https://github.com/rust-lang/rust/issues                     =
= Copy and paste the text below into the issue report thread.  Thanks!           =
==================================================================================

searched nightlies: from nightly-2022-09-10 to nightly-2023-01-20
regressed nightly: nightly-2022-11-22
searched commit range: https://github.com/rust-lang/rust/compare/a28f3c88e50a77bc2a91889241248c4543854e61...b7bc90fea3b441234a84b49fdafeb75815eebbab
regressed commit: https://github.com/rust-lang/rust/commit/7fe6f36224e92db6fbde952e0b7e50863161f6ee

<details>
<summary>bisected with <a href='https://github.com/rust-lang/cargo-bisect-rustc'>cargo-bisect-rustc</a> v0.6.5</summary>


Host triple: x86_64-unknown-linux-gnu
Reproduce with:
```bash
cargo bisect-rustc --prompt --access github --start 2022-09-10 --end 2023-01-20 --regress error 
```

[steffahn]

@rustbot label A-impl-trait

Ping @cjgillot because of the regressing PR.

[apiraino]

WG-prioritization assigning priority (Zulip discussion).

@rustbot label -I-prioritize +P-critical