ICE when running cargo doc: unexpected region kind: !2_1

[maboesanman]

I'm getting an ICE when invoking cargo doc. on this repository

I have the following nightly only features enabled:

#![feature(hash_raw_entry)]
#![feature(type_alias_impl_trait)]

Code

cargo doc --package=cozal

Meta

rustc --version --verbose:

rustc 1.83.0-nightly (fb4aebddd 2024-09-30)
binary: rustc
commit-hash: fb4aebddd18d258046ddb51fd41589295259a0fa
commit-date: 2024-09-30
host: aarch64-apple-darwin
release: 1.83.0-nightly
LLVM version: 19.1.0

Error output

error: internal compiler error: src/librustdoc/clean/auto_trait.rs:194:21: unexpected region kind: !2_1

thread 'rustc' panicked at src/librustdoc/clean/auto_trait.rs:194:21:
Box<dyn Any>
stack backtrace:
   0:        0x10eb8e1dc - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::hcbe8dce94c4998a0
   1:        0x10bf3d12c - core::fmt::write::h3565bfae1b064ab4
   2:        0x10eb81e8c - std::io::Write::write_fmt::h393fac356fe80426
   3:        0x10eb8e09c - std::sys::backtrace::BacktraceLock::print::h381dc4c3f963a517
   4:        0x10eb905b8 - std::panicking::default_hook::{{closure}}::h0cec836e006d2694
   5:        0x10eb903f0 - std::panicking::default_hook::h6154b0643a0d6cc5
   6:        0x10caf5efc - <alloc[7e9b0e58412c4eba]::boxed::Box<rustc_driver_impl[a59188a279d01948]::install_ice_hook::{closure#0}> as core[986a2d210daabfc2]::ops::function::Fn<(&dyn for<'a, 'b> core[986a2d210daabfc2]::ops::function::Fn<(&'a std[d7a7da502724e93d]::panic::PanicHookInfo<'b>,), Output = ()> + core[986a2d210daabfc2]::marker::Sync + core[986a2d210daabfc2]::marker::Send, &std[d7a7da502724e93d]::panic::PanicHookInfo)>>::call
   7:        0x10eb90e48 - std::panicking::rust_panic_with_hook::ha23707cf27e12afe
   8:        0x10cbc7828 - std[d7a7da502724e93d]::panicking::begin_panic::<rustc_errors[4f6ce07e3a1a6dde]::ExplicitBug>::{closure#0}
   9:        0x10cbc4400 - std[d7a7da502724e93d]::sys::backtrace::__rust_end_short_backtrace::<std[d7a7da502724e93d]::panicking::begin_panic<rustc_errors[4f6ce07e3a1a6dde]::ExplicitBug>::{closure#0}, !>
  10:        0x11128c80c - std[d7a7da502724e93d]::panicking::begin_panic::<rustc_errors[4f6ce07e3a1a6dde]::ExplicitBug>
  11:        0x10cba660c - <rustc_errors[4f6ce07e3a1a6dde]::diagnostic::BugAbort as rustc_errors[4f6ce07e3a1a6dde]::diagnostic::EmissionGuarantee>::emit_producing_guarantee
  12:        0x10d8ea038 - rustc_middle[74a3a980942a318e]::util::bug::opt_span_bug_fmt::<rustc_span[b159bff907dfcfda]::span_encoding::Span>::{closure#0}
  13:        0x10d8e9f78 - rustc_middle[74a3a980942a318e]::ty::context::tls::with_opt::<rustc_middle[74a3a980942a318e]::util::bug::opt_span_bug_fmt<rustc_span[b159bff907dfcfda]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  14:        0x10d8e9f44 - rustc_middle[74a3a980942a318e]::ty::context::tls::with_context_opt::<rustc_middle[74a3a980942a318e]::ty::context::tls::with_opt<rustc_middle[74a3a980942a318e]::util::bug::opt_span_bug_fmt<rustc_span[b159bff907dfcfda]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  15:        0x111333f74 - rustc_middle[74a3a980942a318e]::util::bug::bug_fmt
  16:        0x100c19b54 - rustdoc[f694b0418ccc54ef]::clean::auto_trait::clean_param_env::{closure#3}::{closure#0}
  17:        0x100cc3c74 - rustc_middle[74a3a980942a318e]::ty::util::fold_list::<rustc_middle[74a3a980942a318e]::ty::fold::RegionFolder, &rustc_middle[74a3a980942a318e]::ty::list::RawList<(), rustc_middle[74a3a980942a318e]::ty::generic_args::GenericArg>, rustc_middle[74a3a980942a318e]::ty::generic_args::GenericArg, <&rustc_middle[74a3a980942a318e]::ty::list::RawList<(), rustc_middle[74a3a980942a318e]::ty::generic_args::GenericArg> as rustc_type_ir[9cd1ec74b63a3e5d]::fold::TypeFoldable<rustc_middle[74a3a980942a318e]::ty::context::TyCtxt>>::try_fold_with<rustc_middle[74a3a980942a318e]::ty::fold::RegionFolder>::{closure#0}>
  18:        0x100b47b18 - <rustc_middle[74a3a980942a318e]::ty::Ty as rustc_type_ir[9cd1ec74b63a3e5d]::fold::TypeSuperFoldable<rustc_middle[74a3a980942a318e]::ty::context::TyCtxt>>::super_fold_with::<rustc_middle[74a3a980942a318e]::ty::fold::RegionFolder>
  19:        0x100c01c8c - <&rustc_middle[74a3a980942a318e]::ty::list::RawList<(), rustc_middle[74a3a980942a318e]::ty::generic_args::GenericArg> as rustc_type_ir[9cd1ec74b63a3e5d]::fold::TypeFoldable<rustc_middle[74a3a980942a318e]::ty::context::TyCtxt>>::try_fold_with::<rustc_middle[74a3a980942a318e]::ty::fold::RegionFolder>
  20:        0x100ac50a8 - <rustc_type_ir[9cd1ec74b63a3e5d]::predicate_kind::PredicateKind<rustc_middle[74a3a980942a318e]::ty::context::TyCtxt> as rustc_type_ir[9cd1ec74b63a3e5d]::fold::TypeFoldable<rustc_middle[74a3a980942a318e]::ty::context::TyCtxt>>::try_fold_with::<rustc_middle[74a3a980942a318e]::ty::fold::RegionFolder>
  21:        0x100bf7fcc - <rustc_middle[74a3a980942a318e]::ty::fold::RegionFolder as rustc_type_ir[9cd1ec74b63a3e5d]::fold::FallibleTypeFolder<rustc_middle[74a3a980942a318e]::ty::context::TyCtxt>>::try_fold_binder::<rustc_type_ir[9cd1ec74b63a3e5d]::predicate_kind::PredicateKind<rustc_middle[74a3a980942a318e]::ty::context::TyCtxt>>
  22:        0x100a64b10 - rustdoc[f694b0418ccc54ef]::clean::auto_trait::synthesize_auto_trait_impl
  23:        0x100a0535c - <alloc[7e9b0e58412c4eba]::vec::Vec<rustdoc[f694b0418ccc54ef]::clean::types::Item> as alloc[7e9b0e58412c4eba]::vec::spec_from_iter::SpecFromIter<rustdoc[f694b0418ccc54ef]::clean::types::Item, core[986a2d210daabfc2]::iter::adapters::filter_map::FilterMap<alloc[7e9b0e58412c4eba]::vec::into_iter::IntoIter<rustc_span[b159bff907dfcfda]::def_id::DefId>, rustdoc[f694b0418ccc54ef]::clean::auto_trait::synthesize_auto_trait_impls::{closure#0}>>>::from_iter
  24:        0x100a62724 - rustdoc[f694b0418ccc54ef]::clean::auto_trait::synthesize_auto_trait_impls
  25:        0x100b56370 - rustdoc[f694b0418ccc54ef]::clean::utils::synthesize_auto_trait_and_blanket_impls
  26:        0x100a61d08 - <rustdoc[f694b0418ccc54ef]::passes::collect_trait_impls::SyntheticImplCollector as rustdoc[f694b0418ccc54ef]::visit::DocVisitor>::visit_item
  27:        0x100a61a40 - <rustdoc[f694b0418ccc54ef]::passes::collect_trait_impls::SyntheticImplCollector as rustdoc[f694b0418ccc54ef]::visit::DocVisitor>::visit_item
  28:        0x100a61a40 - <rustdoc[f694b0418ccc54ef]::passes::collect_trait_impls::SyntheticImplCollector as rustdoc[f694b0418ccc54ef]::visit::DocVisitor>::visit_item
  29:        0x100a61a40 - <rustdoc[f694b0418ccc54ef]::passes::collect_trait_impls::SyntheticImplCollector as rustdoc[f694b0418ccc54ef]::visit::DocVisitor>::visit_item
  30:        0x100a61a40 - <rustdoc[f694b0418ccc54ef]::passes::collect_trait_impls::SyntheticImplCollector as rustdoc[f694b0418ccc54ef]::visit::DocVisitor>::visit_item
  31:        0x100c66100 - <rustc_session[5b57ec7c78240d07]::session::Session>::time::<alloc[7e9b0e58412c4eba]::vec::Vec<rustdoc[f694b0418ccc54ef]::clean::types::Item>, rustdoc[f694b0418ccc54ef]::passes::collect_trait_impls::collect_trait_impls::{closure#0}>
  32:        0x100a5fd24 - rustdoc[f694b0418ccc54ef]::passes::collect_trait_impls::collect_trait_impls
  33:        0x100c67388 - <rustc_session[5b57ec7c78240d07]::session::Session>::time::<rustdoc[f694b0418ccc54ef]::clean::types::Crate, rustdoc[f694b0418ccc54ef]::core::run_global_ctxt::{closure#6}>
  34:        0x100d75e90 - rustdoc[f694b0418ccc54ef]::core::run_global_ctxt
  35:        0x100c66374 - <rustc_session[5b57ec7c78240d07]::session::Session>::time::<core[986a2d210daabfc2]::result::Result<(rustdoc[f694b0418ccc54ef]::clean::types::Crate, rustdoc[f694b0418ccc54ef]::config::RenderOptions, rustdoc[f694b0418ccc54ef]::formats::cache::Cache), rustc_span[b159bff907dfcfda]::ErrorGuaranteed>, rustdoc[f694b0418ccc54ef]::main_args::{closure#2}::{closure#0}::{closure#0}::{closure#0}>
  36:        0x100beac28 - <rustc_interface[11996f6d6fb9bfaf]::queries::QueryResult<&rustc_middle[74a3a980942a318e]::ty::context::GlobalCtxt>>::enter::<core[986a2d210daabfc2]::result::Result<(), rustc_span[b159bff907dfcfda]::ErrorGuaranteed>, rustdoc[f694b0418ccc54ef]::main_args::{closure#2}::{closure#0}::{closure#0}>
  37:        0x100a4f84c - rustc_interface[11996f6d6fb9bfaf]::interface::run_compiler::<core[986a2d210daabfc2]::result::Result<(), rustc_span[b159bff907dfcfda]::ErrorGuaranteed>, rustdoc[f694b0418ccc54ef]::main_args::{closure#2}>::{closure#1}
  38:        0x100a0ea6c - rustc_span[b159bff907dfcfda]::create_session_globals_then::<core[986a2d210daabfc2]::result::Result<(), rustc_span[b159bff907dfcfda]::ErrorGuaranteed>, rustc_interface[11996f6d6fb9bfaf]::util::run_in_thread_with_globals<rustc_interface[11996f6d6fb9bfaf]::util::run_in_thread_pool_with_globals<rustc_interface[11996f6d6fb9bfaf]::interface::run_compiler<core[986a2d210daabfc2]::result::Result<(), rustc_span[b159bff907dfcfda]::ErrorGuaranteed>, rustdoc[f694b0418ccc54ef]::main_args::{closure#2}>::{closure#1}, core[986a2d210daabfc2]::result::Result<(), rustc_span[b159bff907dfcfda]::ErrorGuaranteed>>::{closure#0}, core[986a2d210daabfc2]::result::Result<(), rustc_span[b159bff907dfcfda]::ErrorGuaranteed>>::{closure#0}::{closure#0}::{closure#0}>
  39:        0x100b0c95c - std[d7a7da502724e93d]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[11996f6d6fb9bfaf]::util::run_in_thread_with_globals<rustc_interface[11996f6d6fb9bfaf]::util::run_in_thread_pool_with_globals<rustc_interface[11996f6d6fb9bfaf]::interface::run_compiler<core[986a2d210daabfc2]::result::Result<(), rustc_span[b159bff907dfcfda]::ErrorGuaranteed>, rustdoc[f694b0418ccc54ef]::main_args::{closure#2}>::{closure#1}, core[986a2d210daabfc2]::result::Result<(), rustc_span[b159bff907dfcfda]::ErrorGuaranteed>>::{closure#0}, core[986a2d210daabfc2]::result::Result<(), rustc_span[b159bff907dfcfda]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[986a2d210daabfc2]::result::Result<(), rustc_span[b159bff907dfcfda]::ErrorGuaranteed>>
  40:        0x100a7d288 - <<std[d7a7da502724e93d]::thread::Builder>::spawn_unchecked_<rustc_interface[11996f6d6fb9bfaf]::util::run_in_thread_with_globals<rustc_interface[11996f6d6fb9bfaf]::util::run_in_thread_pool_with_globals<rustc_interface[11996f6d6fb9bfaf]::interface::run_compiler<core[986a2d210daabfc2]::result::Result<(), rustc_span[b159bff907dfcfda]::ErrorGuaranteed>, rustdoc[f694b0418ccc54ef]::main_args::{closure#2}>::{closure#1}, core[986a2d210daabfc2]::result::Result<(), rustc_span[b159bff907dfcfda]::ErrorGuaranteed>>::{closure#0}, core[986a2d210daabfc2]::result::Result<(), rustc_span[b159bff907dfcfda]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[986a2d210daabfc2]::result::Result<(), rustc_span[b159bff907dfcfda]::ErrorGuaranteed>>::{closure#1} as core[986a2d210daabfc2]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  41:        0x10eb9b3d4 - std::sys::pal::unix::thread::Thread::new::thread_start::h044f07dcec563849
  42:        0x18f12ef94 - __pthread_joiner_wake

note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-rustdoc&template=ice.md

note: please make sure that you have updated to the latest nightly

note: please attach the file at `/Users/mason/Source/github.com/maboesanman/rhythmium/rustc-ice-2024-10-02T01_30_25-18968.txt` to your bug report

note: compiler flags: --crate-type lib

note: some of the compiler flags provided by cargo are hidden

query stack during panic:
end of query stack

Backtrace

<backtrace>

[kpreid]

@rustbot label +E-needs-mcve

[fmease]

Duplicate of #120606