regression: overflow evaluating the requirement

[BoxyUwU]

• https://crater-reports.s3.amazonaws.com/beta-1.91-2/beta-2025-09-21/gh/doyoubi.undermoon/log.txt
• https://crater-reports.s3.amazonaws.com/beta-1.91-2/beta-2025-09-21/gh/tyilo.exhaustive-map/log.txt

[INFO] [stdout] error[E0275]: overflow evaluating the requirement `warp::filter::or::_::__EitherFuture<'_, warp::filter::or::Or<warp::filter::map::Map<warp::filter::and::And<warp::filter::FilterFn<{closure@warp::filters::method::method_is<{closure@...}>::{closure#0}}>, ...>, ...>, ...>, ...>: Unpin`
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider increasing the recursion limit by adding a `#![recursion_limit = "256"]` attribute to your crate (`undermoon`)
[INFO] [stdout]     = note: required for `EitherFuture<Or<Map<And<FilterFn<...>, ...>, ...>, ...>, ...>` to implement `Unpin`
[INFO] [stdout] note: required because it appears within the type `__State<'_, Or<Or<Map<And<FilterFn<...>, ...>, ...>, ...>, ...>, ...>`
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/warp-0.3.2/src/filter/or.rs:50:6
[INFO] [stdout]     |
[INFO] [stdout]  50 | enum State<T: Filter, U: Filter> {
[INFO] [stdout]     |      ^^^^^
[INFO] [stdout]     = note: required for `State<Or<Or<Map<And<FilterFn<...>, ...>, ...>, ...>, ...>, ...>` to implement `Unpin`

[theemathas]

The "regression" in exhaustive-map is due to the crate using ui_test, which checks for the exact diagnostics output for compiler errors. This isn't covered within the stability guarantees. The change is probably due to the improved diagnostics from #144039, which causes long type names to be shortened in more places in compiler errors.

That leaves the undermoon regression, which I am investigating.

[theemathas]

In the undermoon crate, adding #![recursion_limit = "150"] (note: the default limit is 128) to src/lib.rs causes cargo +beta build to compile without errors. So, it seems that the code already almost reached the recursion limit on stable, and something in beta caused it to slightly go over that limit. I assume that this is acceptable breakage?

[theemathas]

Result of bisection of undermoon:

Regression in f5703d5

Attempting to search unrolled perf builds
adding local env GITHUB_TOKEN value to headers in github query
adding local env GITHUB_TOKEN value to headers in github query
ERROR: couldn't find perf build comment

That commit is from #144689, which doesn't make a ton of sense to me? cc @JonathanBrouwer