internal compiler error: no errors encountered even though delay_span_bug issued

[iajoiner]

Code

One GitHub Action in Apache Arrow Rust involving docs has been failing since about 23 hours ago.

cargo doc --document-private-items --no-deps --workspace --all-features

Meta

I do not have access to the exact configs but this is what we have now
rustc --version --verbose:

rustc 1.65.0-nightly (750bd1a7f 2022-09-14) running on x86_64-unknown-linux-gnu

Error output

error: internal compiler error: no errors encountered even though `delay_span_bug` issued
 
 error: internal compiler error: broken MIR in DefId(0:345 ~ tower[3c23]::balance::pool::{impl#3}::build) (CanonicalUserTypeAnnotation { user_ty: Canonical { max_universe: U0, variables: [CanonicalVarInfo { kind: Ty(General(U0)) }, CanonicalVarInfo { kind: Ty(General(U0)) }, CanonicalVarInfo { kind: Ty(General(U0)) }, CanonicalVarInfo { kind: Ty(General(U0)) }], value: TypeOf(DefId(0:232 ~ tower[3c23]::balance::p2c::service::{impl#1}::new), UserSubsts { substs: [^0, ^1], user_self_ty: Some(UserSelfTy { impl_def_id: DefId(0:229 ~ tower[3c23]::balance::p2c::service::{impl#1}), self_ty: balance::p2c::service::Balance<^2, ^3> }) }) }, span: /usr/local/cargo/registry/src/github.com-1ecc6299db9ec823/tower-0.4.13/src/balance/pool/mod.rs:293:22: 293:34 (#0), inferred_ty: fn(std::pin::Pin<std::boxed::Box<balance::pool::PoolDiscoverer<MS, Target, Request>>>) -> balance::p2c::service::Balance<std::pin::Pin<std::boxed::Box<balance::pool::PoolDiscoverer<MS, Target, Request>>>, Request> {balance::p2c::service::Balance::<std::pin::Pin<std::boxed::Box<balance::pool::PoolDiscoverer<MS, Target, Request>>>, Request>::new} }): bad user type AscribeUserType(fn(std::pin::Pin<std::boxed::Box<balance::pool::PoolDiscoverer<MS, Target, Request>>>) -> balance::p2c::service::Balance<std::pin::Pin<std::boxed::Box<balance::pool::PoolDiscoverer<MS, Target, Request>>>, Request> {balance::p2c::service::Balance::<std::pin::Pin<std::boxed::Box<balance::pool::PoolDiscoverer<MS, Target, Request>>>, Request>::new}, DefId(0:232 ~ tower[3c23]::balance::p2c::service::{impl#1}::new) UserSubsts { substs: [_, _], user_self_ty: Some(UserSelfTy { impl_def_id: DefId(0:229 ~ tower[3c23]::balance::p2c::service::{impl#1}), self_ty: balance::p2c::service::Balance<_, _> }) }, type_of=fn(D) -> balance::p2c::service::Balance<D, Req> {balance::p2c::service::Balance::<D, Req>::new}): NoSolution
 |
 = note: delayed at compiler/rustc_borrowck/src/type_check/mod.rs:1087:25
 
 thread 'rustc' panicked at 'Box<dyn Any>', compiler/rustc_errors/src/lib.rs:1492:13

Backtrace

<backtrace>
0: 0x7f6cc5f6ec20 - std::backtrace_rs::backtrace::libunwind::trace::hf9cd4c385c25a2fe
 at /rustc/750bd1a7ff3e010611b97ee75d30b7cbf5f3a03c/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
 1: 0x7f6cc5f6ec20 - std::backtrace_rs::backtrace::trace_unsynchronized::hf9a1be2df46de98c
 at /rustc/750bd1a7ff3e010611b97ee75d30b7cbf5f3a03c/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
 2: 0x7f6cc5f6ec20 - std::sys_common::backtrace::_print_fmt::ha770a6c3890b3cde
 at /rustc/750bd1a7ff3e010611b97ee75d30b7cbf5f3a03c/library/std/src/sys_common/backtrace.rs:66:5
 3: 0x7f6cc5f6ec20 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h7099a61d18d47f5f
 at /rustc/750bd1a7ff3e010611b97ee75d30b7cbf5f3a03c/library/std/src/sys_common/backtrace.rs:45:22
 4: 0x7f6cc5fc9aee - core::fmt::write::h34c269a5556240be
 at /rustc/750bd1a7ff3e010611b97ee75d30b7cbf5f3a03c/library/core/src/fmt/mod.rs:1202:17
 5: 0x7f6cc5f5f835 - std::io::Write::write_fmt::h9b1d898decaac979
 at /rustc/750bd1a7ff3e010611b97ee75d30b7cbf5f3a03c/library/std/src/io/mod.rs:1679:15
 6: 0x7f6cc5f718d3 - std::sys_common::backtrace::_print::hb8325cbd910e0a42
 at /rustc/750bd1a7ff3e010611b97ee75d30b7cbf5f3a03c/library/std/src/sys_common/backtrace.rs:48:5
 7: 0x7f6cc5f718d3 - std::sys_common::backtrace::print::h52eaf8f4259fb854
 at /rustc/750bd1a7ff3e010611b97ee75d30b7cbf5f3a03c/library/std/src/sys_common/backtrace.rs:35:9
 8: 0x7f6cc5f718d3 - std::panicking::default_hook::{{closure}}::h38a1bd1ceb333281
 at /rustc/750bd1a7ff3e010611b97ee75d30b7cbf5f3a03c/library/std/src/panicking.rs:295:22
 9: 0x7f6cc5f715bf - std::panicking::default_hook::hbfa37b6c2aa83708
 at /rustc/750bd1a7ff3e010611b97ee75d30b7cbf5f3a03c/library/std/src/panicking.rs:314:9
 10: 0x7f6cc87d8001 - <rustc_driver[f7b5b01335fbd434]::DEFAULT_HOOK::{closure#0}::{closure#0} as core[f6f8d9be6066ab2c]::ops::function::FnOnce<(&core[f6f8d9be6066ab2c]::panic::panic_info::PanicInfo,)>>::call_once::{shim:vtable#0}
 11: 0x7f6cc5f7210d - std::panicking::rust_panic_with_hook::h6bfc21eea1a19790
 at /rustc/750bd1a7ff3e010611b97ee75d30b7cbf5f3a03c/library/std/src/panicking.rs:702:17
 12: 0x7f6cc9932141 - std[81ab5d9a96a0142e]::panicking::begin_panic::<rustc_errors[e78c9e9af74db21c]::ExplicitBug>::{closure#0}
 13: 0x7f6cc9931c66 - std[81ab5d9a96a0142e]::sys_common::backtrace::__rust_end_short_backtrace::<std[81ab5d9a96a0142e]::panicking::begin_panic<rustc_errors[e78c9e9af74db21c]::ExplicitBug>::{closure#0}, !>
 14: 0x7f6cc99318f6 - std[81ab5d9a96a0142e]::panicking::begin_panic::<rustc_errors[e78c9e9af74db21c]::ExplicitBug>
 15: 0x7f6cc992f446 - std[81ab5d9a96a0142e]::panic::panic_any::<rustc_errors[e78c9e9af74db21c]::ExplicitBug>
 16: 0x7f6cc8329228 - <rustc_errors[e78c9e9af74db21c]::HandlerInner as core[f6f8d9be6066ab2c]::ops::drop::Drop>::drop
 17: 0x7f6cc760bb28 - core[f6f8d9be6066ab2c]::ptr::drop_in_place::<rustc_session[c3e5419825648902]::parse::ParseSess>
 18: 0x7f6cc75c94e8 - <alloc[9d62437589f31483]::rc::Rc<rustc_session[c3e5419825648902]::session::Session> as core[f6f8d9be6066ab2c]::ops::drop::Drop>::drop
 19: 0x7f6cc75c64ad - core[f6f8d9be6066ab2c]::ptr::drop_in_place::<rustc_interface[5bcac5cfb78c3b1a]::interface::Compiler>
 20: 0x7f6cc75c3d0c - rustc_interface[5bcac5cfb78c3b1a]::interface::create_compiler_and_run::<core[f6f8d9be6066ab2c]::result::Result<(), rustc_errors[e78c9e9af74db21c]::ErrorGuaranteed>, rustc_driver[f7b5b01335fbd434]::run_compiler::{closure#1}>
 21: 0x7f6cc75c2211 - <scoped_tls[de48490ce358b7ec]::ScopedKey<rustc_span[352514dd70ceaa1d]::SessionGlobals>>::set::<rustc_interface[5bcac5cfb78c3b1a]::interface::run_compiler<core[f6f8d9be6066ab2c]::result::Result<(), rustc_errors[e78c9e9af74db21c]::ErrorGuaranteed>, rustc_driver[f7b5b01335fbd434]::run_compiler::{closure#1}>::{closure#0}, core[f6f8d9be6066ab2c]::result::Result<(), rustc_errors[e78c9e9af74db21c]::ErrorGuaranteed>>
 22: 0x7f6cc75c1eff - std[81ab5d9a96a0142e]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[5bcac5cfb78c3b1a]::util::run_in_thread_pool_with_globals<rustc_interface[5bcac5cfb78c3b1a]::interface::run_compiler<core[f6f8d9be6066ab2c]::result::Result<(), rustc_errors[e78c9e9af74db21c]::ErrorGuaranteed>, rustc_driver[f7b5b01335fbd434]::run_compiler::{closure#1}>::{closure#0}, core[f6f8d9be6066ab2c]::result::Result<(), rustc_errors[e78c9e9af74db21c]::ErrorGuaranteed>>::{closure#0}, core[f6f8d9be6066ab2c]::result::Result<(), rustc_errors[e78c9e9af74db21c]::ErrorGuaranteed>>
 23: 0x7f6cc863c000 - <<std[81ab5d9a96a0142e]::thread::Builder>::spawn_unchecked_<rustc_interface[5bcac5cfb78c3b1a]::util::run_in_thread_pool_with_globals<rustc_interface[5bcac5cfb78c3b1a]::interface::run_compiler<core[f6f8d9be6066ab2c]::result::Result<(), rustc_errors[e78c9e9af74db21c]::ErrorGuaranteed>, rustc_driver[f7b5b01335fbd434]::run_compiler::{closure#1}>::{closure#0}, core[f6f8d9be6066ab2c]::result::Result<(), rustc_errors[e78c9e9af74db21c]::ErrorGuaranteed>>::{closure#0}, core[f6f8d9be6066ab2c]::result::Result<(), rustc_errors[e78c9e9af74db21c]::ErrorGuaranteed>>::{closure#1} as core[f6f8d9be6066ab2c]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
 24: 0x7f6cc5f7bee3 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h2695b43ebae659e4
 at /rustc/750bd1a7ff3e010611b97ee75d30b7cbf5f3a03c/library/alloc/src/boxed.rs:1940:9
 25: 0x7f6cc5f7bee3 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hf3b49b955267341c
 at /rustc/750bd1a7ff3e010611b97ee75d30b7cbf5f3a03c/library/alloc/src/boxed.rs:1940:9
 26: 0x7f6cc5f7bee3 - std::sys::unix::thread::Thread::new::thread_start::h2bad5ab8a769c6c8
 at /rustc/750bd1a7ff3e010611b97ee75d30b7cbf5f3a03c/library/std/src/sys/unix/thread.rs:108:17
 27: 0x7f6cc5e4bea7 - start_thread
 28: 0x7f6cc5d69aef - clone
 29: 0x0 - <unknown>

[iajoiner]

Looks like this is identical to #101844

[compiler-errors]

Seems to have been resolved in #101844.