regression: unexpected unsized tail ICE

[Mark-Simulacrum]

[INFO] [stdout] error: internal compiler error: compiler/rustc_monomorphize/src/collector.rs:1121:22: unexpected unsized tail: hyper::server::server::new_svc::State<hyper::server::conn::AddrStream, futures::future::Ready<std::result::Result<warp::filter::service::FilteredService<warp::trace::internal::WithTrace<Closure(DefId(57:1400 ~ warp[b780]::filters::trace::request::{closure#0}), [i8, Binder(extern "RustCall" fn((warp::trace::Info<ReBound(DebruijnIndex(0), BoundRegion { var: 0, kind: BrAnon })>,)) -> tracing::span::Span, [Region(BrAnon)]), ()]), warp::filter::map::Map<warp::filter::FilterFn<Closure(DefId(57:1165 ~ warp[b780]::filters::path::end::{closure#0}), [i8, Binder(extern "RustCall" fn((&ReBound(DebruijnIndex(0), BoundRegion { var: 0, kind: BrAnon }) mut warp::route::Route,)) -> futures::future::Ready<std::result::Result<(), warp::Rejection>>, [Region(BrAnon)]), ()])>, Closure(DefId(0:9 ~ rustc_warp_ice[7eee]::main::{closure#0}), [i8, Binder(extern "RustCall" fn(()) -> &ReErased str, []), ()])>>>, std::convert::Infallible>>, warp::filter::service::FilteredService<warp::trace::internal::WithTrace<Closure(DefId(57:1400 ~ warp[b780]::filters::trace::request::{closure#0}), [i8, Binder(extern "RustCall" fn((warp::trace::Info<ReBound(DebruijnIndex(0), BoundRegion { var: 0, kind: BrAnon })>,)) -> tracing::span::Span, [Region(BrAnon)]), ()]), warp::filter::map::Map<warp::filter::FilterFn<Closure(DefId(57:1165 ~ warp[b780]::filters::path::end::{closure#0}), [i8, Binder(extern "RustCall" fn((&ReBound(DebruijnIndex(0), BoundRegion { var: 0, kind: BrAnon }) mut warp::route::Route,)) -> futures::future::Ready<std::result::Result<(), warp::Rejection>>, [Region(BrAnon)]), ()])>, Closure(DefId(0:9 ~ rustc_warp_ice[7eee]::main::{closure#0}), [i8, Binder(extern "RustCall" fn(()) -> &ReErased str, []), ()])>>>, hyper::common::exec::Exec, hyper::server::server::NoopWatcher>

• https://crater-reports.s3.amazonaws.com/beta-1.78-3/beta-2024-03-30/gh/phlip9.rustc-warp-ice/log.txt

This seems like a potential recurrence of #108721, which was fixed in #108754 but lacked a test case.

[compiler-errors]

searched nightlies: from nightly-2024-02-01 to nightly-2024-02-29
regressed nightly: nightly-2024-02-20
searched commit range: 2bf78d1...3246e79
regressed commit: 0243834

bisected with cargo-bisect-rustc v0.6.8

Host triple: x86_64-unknown-linux-gnu
Reproduce with:

cargo bisect-rustc --start=2024-02-01 --end=2024-02-29 --regress=ice 

Regressed in #120463 -- cc @lcnr

[apiraino]

WG-prioritization assigning priority (Zulip discussion).

@rustbot label -I-prioritize +P-high

[lcnr]

can revert the change from #120463 which caused this 2 weeks before this hits stable. We dshould really get a minimization of this issue though :/

[lcnr]

(the cause should be this commit 399a258)