regression: anonymous lifetimes now unstable in impl trait

[Mark-Simulacrum]

• https://crater-reports.s3.amazonaws.com/beta-1.67-2.4/beta-2022-12-29/reg/hltas-0.6.0/log.txt
• https://crater-reports.s3.amazonaws.com/beta-1.67-2.4/beta-2022-12-29/reg/monch-0.4.0/log.txt
• https://crater-reports.s3.amazonaws.com/beta-1.67-2.4/beta-2022-12-29/reg/hltas-0.6.0/log.txt
• https://crater-reports.s3.amazonaws.com/beta-1.67-2.4/beta-2022-12-29/gh/shff.paq/log.txt

cc #104048 as possible root cause, @cjgillot

[apiraino]

WG-prioritization assigning priority (Zulip discussion).

@rustbot label -I-prioritize +P-critical