ICE: unexpected region for note_and_explain_region: '?9

[matthiaskrgr]

snippet:

async fn multiple_named_lifetimes<'a, 'b>(_: u8, ...) {}

Version information

rustc 1.80.0-nightly (cf774742b 2024-05-10)
binary: rustc
commit-hash: cf774742b6029e0c2e00654975c001d192063b5b
commit-date: 2024-05-10
host: x86_64-unknown-linux-gnu
release: 1.80.0-nightly
LLVM version: 18.1.4

Command:
/home/matthias/.rustup/toolchains/master/bin/rustc

Program output

error[E0670]: `async fn` is not permitted in Rust 2015
 --> /tmp/icemaker_global_tempdir.GiN1IAxQuFjn/rustc_testrunner_tmpdir_reporting.SqlRTUOo4WQV/mvce.rs:1:1
  |
1 | async fn multiple_named_lifetimes<'a, 'b>(_: u8, ...) {}
  | ^^^^^ to use `async fn`, switch to Rust 2018 or later
  |
  = help: pass `--edition 2021` to `rustc`
  = note: for more on editions, read https://doc.rust-lang.org/edition-guide

error: only foreign or `unsafe extern "C"` functions may be C-variadic
 --> /tmp/icemaker_global_tempdir.GiN1IAxQuFjn/rustc_testrunner_tmpdir_reporting.SqlRTUOo4WQV/mvce.rs:1:50
  |
1 | async fn multiple_named_lifetimes<'a, 'b>(_: u8, ...) {}
  |                                                  ^^^

error[E0658]: C-variadic functions are unstable
 --> /tmp/icemaker_global_tempdir.GiN1IAxQuFjn/rustc_testrunner_tmpdir_reporting.SqlRTUOo4WQV/mvce.rs:1:1
  |
1 | async fn multiple_named_lifetimes<'a, 'b>(_: u8, ...) {}
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  |
  = note: see issue #44930 <https://github.com/rust-lang/rust/issues/44930> for more information
  = help: add `#![feature(c_variadic)]` to the crate attributes to enable
  = note: this compiler was built on 2024-05-10; consider upgrading it if it is out of date

error[E0601]: `main` function not found in crate `mvce`
 --> /tmp/icemaker_global_tempdir.GiN1IAxQuFjn/rustc_testrunner_tmpdir_reporting.SqlRTUOo4WQV/mvce.rs:1:57
  |
1 | async fn multiple_named_lifetimes<'a, 'b>(_: u8, ...) {}
  |                                                         ^ consider adding a `main` function to `/tmp/icemaker_global_tempdir.GiN1IAxQuFjn/rustc_testrunner_tmpdir_reporting.SqlRTUOo4WQV/mvce.rs`

error: internal compiler error: compiler/rustc_infer/src/infer/error_reporting/mod.rs:176:13: unexpected region for note_and_explain_region: '?9

thread 'rustc' panicked at compiler/rustc_infer/src/infer/error_reporting/mod.rs:176:13:
Box<dyn Any>
stack backtrace:
   0:     0x72a768e58c45 - std::backtrace_rs::backtrace::libunwind::trace::h4459b5fcdbbebcd1
                               at /rustc/cf774742b6029e0c2e00654975c001d192063b5b/library/std/src/../../backtrace/src/backtrace/libunwind.rs:105:5
   1:     0x72a768e58c45 - std::backtrace_rs::backtrace::trace_unsynchronized::h7689b852d677b87d
                               at /rustc/cf774742b6029e0c2e00654975c001d192063b5b/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x72a768e58c45 - std::sys_common::backtrace::_print_fmt::h71c26c720eed4647
                               at /rustc/cf774742b6029e0c2e00654975c001d192063b5b/library/std/src/sys_common/backtrace.rs:68:5
   3:     0x72a768e58c45 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hdc35caba0025b2c4
                               at /rustc/cf774742b6029e0c2e00654975c001d192063b5b/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x72a768ea7deb - core::fmt::rt::Argument::fmt::h17121c67f3b92fbf
                               at /rustc/cf774742b6029e0c2e00654975c001d192063b5b/library/core/src/fmt/rt.rs:165:63
   5:     0x72a768ea7deb - core::fmt::write::hffa7869c496aec23
                               at /rustc/cf774742b6029e0c2e00654975c001d192063b5b/library/core/src/fmt/mod.rs:1157:21
   6:     0x72a768e4da0f - std::io::Write::write_fmt::hb780122e9345f028
                               at /rustc/cf774742b6029e0c2e00654975c001d192063b5b/library/std/src/io/mod.rs:1835:15
   7:     0x72a768e58a1e - std::sys_common::backtrace::_print::h33baa58fa7a6d4bc
                               at /rustc/cf774742b6029e0c2e00654975c001d192063b5b/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x72a768e58a1e - std::sys_common::backtrace::print::h3a8dfa067742d211
                               at /rustc/cf774742b6029e0c2e00654975c001d192063b5b/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x72a768e5b389 - std::panicking::default_hook::{{closure}}::h82b1676be98878d1
  10:     0x72a768e5b0cd - std::panicking::default_hook::h77201445fc6e0430
                               at /rustc/cf774742b6029e0c2e00654975c001d192063b5b/library/std/src/panicking.rs:298:9
  11:     0x72a7658bd43f - std[c6b2ad78a8ca1f10]::panicking::update_hook::<alloc[30e716310958d772]::boxed::Box<rustc_driver_impl[952cc77b60b888c7]::install_ice_hook::{closure#0}>>::{closure#0}
  12:     0x72a768e5ba86 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h0dc40c62f822978e
                               at /rustc/cf774742b6029e0c2e00654975c001d192063b5b/library/alloc/src/boxed.rs:2036:9
  13:     0x72a768e5ba86 - std::panicking::rust_panic_with_hook::hbec4547bfff54ec7
                               at /rustc/cf774742b6029e0c2e00654975c001d192063b5b/library/std/src/panicking.rs:799:13
  14:     0x72a7658eca64 - std[c6b2ad78a8ca1f10]::panicking::begin_panic::<rustc_errors[96ae9b2e9b8e7aba]::ExplicitBug>::{closure#0}
  15:     0x72a7658e9886 - std[c6b2ad78a8ca1f10]::sys_common::backtrace::__rust_end_short_backtrace::<std[c6b2ad78a8ca1f10]::panicking::begin_panic<rustc_errors[96ae9b2e9b8e7aba]::ExplicitBug>::{closure#0}, !>
  16:     0x72a7658e9566 - std[c6b2ad78a8ca1f10]::panicking::begin_panic::<rustc_errors[96ae9b2e9b8e7aba]::ExplicitBug>
  17:     0x72a7658f5db1 - <rustc_errors[96ae9b2e9b8e7aba]::diagnostic::BugAbort as rustc_errors[96ae9b2e9b8e7aba]::diagnostic::EmissionGuarantee>::emit_producing_guarantee
  18:     0x72a765dba14c - rustc_middle[593177a75effa888]::util::bug::opt_span_bug_fmt::<rustc_span[dba908c66bd5e7b9]::span_encoding::Span>::{closure#0}
  19:     0x72a765d9e08a - rustc_middle[593177a75effa888]::ty::context::tls::with_opt::<rustc_middle[593177a75effa888]::util::bug::opt_span_bug_fmt<rustc_span[dba908c66bd5e7b9]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  20:     0x72a765d9df0b - rustc_middle[593177a75effa888]::ty::context::tls::with_context_opt::<rustc_middle[593177a75effa888]::ty::context::tls::with_opt<rustc_middle[593177a75effa888]::util::bug::opt_span_bug_fmt<rustc_span[dba908c66bd5e7b9]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  21:     0x72a763b646c0 - rustc_middle[593177a75effa888]::util::bug::bug_fmt
  22:     0x72a765bc85c5 - rustc_infer[df220a3f8ba47496]::infer::error_reporting::note_and_explain_region
  23:     0x72a765bf6845 - rustc_infer[df220a3f8ba47496]::infer::error_reporting::unexpected_hidden_region_diagnostic
  24:     0x72a767b6694e - rustc_borrowck[4ef7d159813c8a4]::do_mir_borrowck
  25:     0x72a767b3403c - rustc_query_impl[476d1842c1ea56b3]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[476d1842c1ea56b3]::query_impl::mir_borrowck::dynamic_query::{closure#2}::{closure#0}, rustc_middle[593177a75effa888]::query::erase::Erased<[u8; 8usize]>>
  26:     0x72a766f9ce31 - rustc_query_system[c7df0e1991f41dfe]::query::plumbing::try_execute_query::<rustc_query_impl[476d1842c1ea56b3]::DynamicConfig<rustc_query_system[c7df0e1991f41dfe]::query::caches::VecCache<rustc_span[dba908c66bd5e7b9]::def_id::LocalDefId, rustc_middle[593177a75effa888]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[476d1842c1ea56b3]::plumbing::QueryCtxt, false>
  27:     0x72a766f9c88c - rustc_query_impl[476d1842c1ea56b3]::query_impl::mir_borrowck::get_query_non_incr::__rust_end_short_backtrace
  28:     0x72a7675c3e2f - rustc_middle[593177a75effa888]::query::plumbing::query_get_at::<rustc_query_system[c7df0e1991f41dfe]::query::caches::VecCache<rustc_span[dba908c66bd5e7b9]::def_id::LocalDefId, rustc_middle[593177a75effa888]::query::erase::Erased<[u8; 8usize]>>>
  29:     0x72a76794d2dc - rustc_hir_analysis[e055a71f98e58cea]::collect::type_of::type_of_opaque
  30:     0x72a76794d14f - rustc_query_impl[476d1842c1ea56b3]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[476d1842c1ea56b3]::query_impl::type_of_opaque::dynamic_query::{closure#2}::{closure#0}, rustc_middle[593177a75effa888]::query::erase::Erased<[u8; 8usize]>>
  31:     0x72a766c6e097 - rustc_query_system[c7df0e1991f41dfe]::query::plumbing::try_execute_query::<rustc_query_impl[476d1842c1ea56b3]::DynamicConfig<rustc_query_system[c7df0e1991f41dfe]::query::caches::DefIdCache<rustc_middle[593177a75effa888]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[476d1842c1ea56b3]::plumbing::QueryCtxt, false>
  32:     0x72a767c0b3de - rustc_query_impl[476d1842c1ea56b3]::query_impl::type_of_opaque::get_query_non_incr::__rust_end_short_backtrace
  33:     0x72a767257ebc - rustc_middle[593177a75effa888]::query::plumbing::query_get_at::<rustc_query_system[c7df0e1991f41dfe]::query::caches::DefIdCache<rustc_middle[593177a75effa888]::query::erase::Erased<[u8; 8usize]>>>
  34:     0x72a764a3f333 - rustc_hir_analysis[e055a71f98e58cea]::collect::type_of::type_of
  35:     0x72a766c6f46c - rustc_query_impl[476d1842c1ea56b3]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[476d1842c1ea56b3]::query_impl::type_of::dynamic_query::{closure#2}::{closure#0}, rustc_middle[593177a75effa888]::query::erase::Erased<[u8; 8usize]>>
  36:     0x72a766c6e097 - rustc_query_system[c7df0e1991f41dfe]::query::plumbing::try_execute_query::<rustc_query_impl[476d1842c1ea56b3]::DynamicConfig<rustc_query_system[c7df0e1991f41dfe]::query::caches::DefIdCache<rustc_middle[593177a75effa888]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[476d1842c1ea56b3]::plumbing::QueryCtxt, false>
  37:     0x72a766c6db9b - rustc_query_impl[476d1842c1ea56b3]::query_impl::type_of::get_query_non_incr::__rust_end_short_backtrace
  38:     0x72a767257ebc - rustc_middle[593177a75effa888]::query::plumbing::query_get_at::<rustc_query_system[c7df0e1991f41dfe]::query::caches::DefIdCache<rustc_middle[593177a75effa888]::query::erase::Erased<[u8; 8usize]>>>
  39:     0x72a767ba6f5a - rustc_hir_analysis[e055a71f98e58cea]::check::check::check_item_type
  40:     0x72a7672425d5 - rustc_hir_analysis[e055a71f98e58cea]::check::wfcheck::check_well_formed
  41:     0x72a76724109d - rustc_query_impl[476d1842c1ea56b3]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[476d1842c1ea56b3]::query_impl::check_well_formed::dynamic_query::{closure#2}::{closure#0}, rustc_middle[593177a75effa888]::query::erase::Erased<[u8; 1usize]>>
  42:     0x72a767240840 - rustc_query_system[c7df0e1991f41dfe]::query::plumbing::try_execute_query::<rustc_query_impl[476d1842c1ea56b3]::DynamicConfig<rustc_query_system[c7df0e1991f41dfe]::query::caches::VecCache<rustc_hir[e7d04f52188a6143]::hir_id::OwnerId, rustc_middle[593177a75effa888]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[476d1842c1ea56b3]::plumbing::QueryCtxt, false>
  43:     0x72a7672405bf - rustc_query_impl[476d1842c1ea56b3]::query_impl::check_well_formed::get_query_non_incr::__rust_end_short_backtrace
  44:     0x72a76723e4f7 - rustc_hir_analysis[e055a71f98e58cea]::check::wfcheck::check_mod_type_wf
  45:     0x72a76723e31f - rustc_query_impl[476d1842c1ea56b3]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[476d1842c1ea56b3]::query_impl::check_mod_type_wf::dynamic_query::{closure#2}::{closure#0}, rustc_middle[593177a75effa888]::query::erase::Erased<[u8; 1usize]>>
  46:     0x72a7676697b0 - rustc_query_system[c7df0e1991f41dfe]::query::plumbing::try_execute_query::<rustc_query_impl[476d1842c1ea56b3]::DynamicConfig<rustc_query_system[c7df0e1991f41dfe]::query::caches::DefaultCache<rustc_span[dba908c66bd5e7b9]::def_id::LocalModDefId, rustc_middle[593177a75effa888]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[476d1842c1ea56b3]::plumbing::QueryCtxt, false>
  47:     0x72a76766955b - rustc_query_impl[476d1842c1ea56b3]::query_impl::check_mod_type_wf::get_query_non_incr::__rust_end_short_backtrace
  48:     0x72a766f99e86 - rustc_hir_analysis[e055a71f98e58cea]::check_crate
  49:     0x72a766f900c7 - rustc_interface[46c8bb9d4caee8c3]::passes::analysis
  50:     0x72a766f8fc15 - rustc_query_impl[476d1842c1ea56b3]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[476d1842c1ea56b3]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[593177a75effa888]::query::erase::Erased<[u8; 1usize]>>
  51:     0x72a7679c9125 - rustc_query_system[c7df0e1991f41dfe]::query::plumbing::try_execute_query::<rustc_query_impl[476d1842c1ea56b3]::DynamicConfig<rustc_query_system[c7df0e1991f41dfe]::query::caches::SingleCache<rustc_middle[593177a75effa888]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[476d1842c1ea56b3]::plumbing::QueryCtxt, false>
  52:     0x72a7679c8e89 - rustc_query_impl[476d1842c1ea56b3]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  53:     0x72a76783b98e - rustc_interface[46c8bb9d4caee8c3]::interface::run_compiler::<core[64db745a9a78ebe5]::result::Result<(), rustc_span[dba908c66bd5e7b9]::ErrorGuaranteed>, rustc_driver_impl[952cc77b60b888c7]::run_compiler::{closure#0}>::{closure#1}
  54:     0x72a7678006c9 - std[c6b2ad78a8ca1f10]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[46c8bb9d4caee8c3]::util::run_in_thread_with_globals<rustc_interface[46c8bb9d4caee8c3]::util::run_in_thread_pool_with_globals<rustc_interface[46c8bb9d4caee8c3]::interface::run_compiler<core[64db745a9a78ebe5]::result::Result<(), rustc_span[dba908c66bd5e7b9]::ErrorGuaranteed>, rustc_driver_impl[952cc77b60b888c7]::run_compiler::{closure#0}>::{closure#1}, core[64db745a9a78ebe5]::result::Result<(), rustc_span[dba908c66bd5e7b9]::ErrorGuaranteed>>::{closure#0}, core[64db745a9a78ebe5]::result::Result<(), rustc_span[dba908c66bd5e7b9]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[64db745a9a78ebe5]::result::Result<(), rustc_span[dba908c66bd5e7b9]::ErrorGuaranteed>>
  55:     0x72a767800476 - <<std[c6b2ad78a8ca1f10]::thread::Builder>::spawn_unchecked_<rustc_interface[46c8bb9d4caee8c3]::util::run_in_thread_with_globals<rustc_interface[46c8bb9d4caee8c3]::util::run_in_thread_pool_with_globals<rustc_interface[46c8bb9d4caee8c3]::interface::run_compiler<core[64db745a9a78ebe5]::result::Result<(), rustc_span[dba908c66bd5e7b9]::ErrorGuaranteed>, rustc_driver_impl[952cc77b60b888c7]::run_compiler::{closure#0}>::{closure#1}, core[64db745a9a78ebe5]::result::Result<(), rustc_span[dba908c66bd5e7b9]::ErrorGuaranteed>>::{closure#0}, core[64db745a9a78ebe5]::result::Result<(), rustc_span[dba908c66bd5e7b9]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[64db745a9a78ebe5]::result::Result<(), rustc_span[dba908c66bd5e7b9]::ErrorGuaranteed>>::{closure#2} as core[64db745a9a78ebe5]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  56:     0x72a768e658cb - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h33c1d84a0e8e1d74
                               at /rustc/cf774742b6029e0c2e00654975c001d192063b5b/library/alloc/src/boxed.rs:2022:9
  57:     0x72a768e658cb - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hab68c4985632962b
                               at /rustc/cf774742b6029e0c2e00654975c001d192063b5b/library/alloc/src/boxed.rs:2022:9
  58:     0x72a768e658cb - std::sys::pal::unix::thread::Thread::new::thread_start::h8f78dbadd93ecd2e
                               at /rustc/cf774742b6029e0c2e00654975c001d192063b5b/library/std/src/sys/pal/unix/thread.rs:108:17
  59:     0x72a7626a955a - <unknown>
  60:     0x72a762726a3c - <unknown>
  61:                0x0 - <unknown>

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

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

note: rustc 1.80.0-nightly (cf774742b 2024-05-10) running on x86_64-unknown-linux-gnu

query stack during panic:
#0 [mir_borrowck] borrow-checking `multiple_named_lifetimes`
#1 [type_of_opaque] computing type of opaque `multiple_named_lifetimes::{opaque#0}`
#2 [type_of] computing type of `multiple_named_lifetimes::{opaque#0}`
#3 [check_well_formed] checking that `multiple_named_lifetimes::{opaque#0}` is well-formed
#4 [check_mod_type_wf] checking that types are well-formed in top-level module
#5 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 5 previous errors

Some errors have detailed explanations: E0601, E0658, E0670.
For more information about an error, try `rustc --explain E0601`.

[matthiaskrgr]

#124918 cc @nnethercote