regression: ImplTrait vs. Ctor expected ICE

[Mark-Simulacrum]

https://crater-reports.s3.amazonaws.com/beta-1.70-2/beta-2023-05-08/gh/zdata-inc.kustd/log.txt

[INFO] [stderr] thread 'rustc' panicked at 'assertion failed: `(left == right)`
[INFO] [stderr]   left: `ImplTrait`,
[INFO] [stderr]  right: `Ctor`', compiler/rustc_metadata/src/rmeta/decoder.rs:1127:17
[INFO] [stderr] stack backtrace:

[apiraino]

WG-prioritization assigning priority (Zulip discussion).

@rustbot label -I-prioritize +P-medium