Repository: rust
Issue: ice: `continue to unknown label` async fn  / `assertion failed: ln.index() < self.live_nodes`
Labels: I-ICE,T-compiler,C-bug,glacier,S-bug-has-test

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### Code

```Rust
async fn f999() -> Vec<usize> {
    'b: {
        continue 'b; 
    }
}
```


### Meta
<!--
If you're using the stable version of the compiler, you should also check if the
bug also exists in the beta or nightly versions.
-->

`rustc --version --verbose`:
```
rustc 1.72.0-nightly (5bd28f5ea 2023-06-28)
binary: rustc
commit-hash: 5bd28f5eac1ba3569bfa8d49ec3f5acbdfdff7a0
commit-date: 2023-06-28
host: x86_64-unknown-linux-gnu
release: 1.72.0-nightly
LLVM version: 16.0.5
```

### Error output

```

```

<!--
Include a backtrace in the code block by setting `RUST_BACKTRACE=1` in your
environment. E.g. `RUST_BACKTRACE=1 cargo build`.
-->
<details><summary><strong>Backtrace</strong></summary>
<p>

```
error[E0696]: `continue` pointing to a labeled block
 --> treereduce.out:3:9
  |
2 | /     'b: {
3 | |         continue 'b;
  | |         ^^^^^^^^^^^ labeled blocks cannot be `continue`'d
4 | |     }
  | |_____- labeled block the `continue` points to

error: internal compiler error: compiler/rustc_passes/src/liveness.rs:1004:40: continue to unknown label
 --> treereduce.out:3:9
  |
3 |         continue 'b;
  |         ^^^^^^^^^^^

thread 'rustc' panicked at 'Box<dyn Any>', /rustc/5bd28f5eac1ba3569bfa8d49ec3f5acbdfdff7a0/compiler/rustc_errors/src/lib.rs:994:33
stack backtrace:
   0:     0x7f3825827e31 - std::backtrace_rs::backtrace::libunwind::trace::h8bc3e596fd6e6181
                               at /rustc/5bd28f5eac1ba3569bfa8d49ec3f5acbdfdff7a0/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7f3825827e31 - std::backtrace_rs::backtrace::trace_unsynchronized::h9a0656fedca2f962
                               at /rustc/5bd28f5eac1ba3569bfa8d49ec3f5acbdfdff7a0/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f3825827e31 - std::sys_common::backtrace::_print_fmt::h11ca79bc953fda0e
                               at /rustc/5bd28f5eac1ba3569bfa8d49ec3f5acbdfdff7a0/library/std/src/sys_common/backtrace.rs:65:5
   3:     0x7f3825827e31 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h23585af82c540d61
                               at /rustc/5bd28f5eac1ba3569bfa8d49ec3f5acbdfdff7a0/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f38258895df - core::fmt::rt::Argument::fmt::h1e7f4bcecbee3fbb
                               at /rustc/5bd28f5eac1ba3569bfa8d49ec3f5acbdfdff7a0/library/core/src/fmt/rt.rs:138:9
   5:     0x7f38258895df - core::fmt::write::h41633f265152b738
                               at /rustc/5bd28f5eac1ba3569bfa8d49ec3f5acbdfdff7a0/library/core/src/fmt/mod.rs:1094:21
   6:     0x7f382581a967 - std::io::Write::write_fmt::hdf9fdeebf4391d4c
                               at /rustc/5bd28f5eac1ba3569bfa8d49ec3f5acbdfdff7a0/library/std/src/io/mod.rs:1714:15
   7:     0x7f3825827c45 - std::sys_common::backtrace::_print::h0761f433dadea582
                               at /rustc/5bd28f5eac1ba3569bfa8d49ec3f5acbdfdff7a0/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7f3825827c45 - std::sys_common::backtrace::print::hffcd468cc9baf957
                               at /rustc/5bd28f5eac1ba3569bfa8d49ec3f5acbdfdff7a0/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7f382582a9f3 - std::panicking::default_hook::{{closure}}::h70eb212f41458c90
                               at /rustc/5bd28f5eac1ba3569bfa8d49ec3f5acbdfdff7a0/library/std/src/panicking.rs:269:22
  10:     0x7f382582a784 - std::panicking::default_hook::hf217f8886a1385fc
                               at /rustc/5bd28f5eac1ba3569bfa8d49ec3f5acbdfdff7a0/library/std/src/panicking.rs:288:9
  11:     0x7f382462217b - <rustc_driver_impl[ea51492c730803db]::install_ice_hook::{closure#0} as core[6e72eb595340d7ba]::ops::function::FnOnce<(&core[6e72eb595340d7ba]::panic::panic_info::PanicInfo,)>>::call_once::{shim:vtable#0}
  12:     0x7f382582b21e - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::hdf84d12f536c7065
                               at /rustc/5bd28f5eac1ba3569bfa8d49ec3f5acbdfdff7a0/library/alloc/src/boxed.rs:2024:9
  13:     0x7f382582b21e - std::panicking::rust_panic_with_hook::h7901b0073bb3ed74
                               at /rustc/5bd28f5eac1ba3569bfa8d49ec3f5acbdfdff7a0/library/std/src/panicking.rs:709:13
  14:     0x7f3824e61d81 - std[4a840e81aae3439]::panicking::begin_panic::<rustc_errors[74566eb9727f9d9c]::ExplicitBug>::{closure#0}
  15:     0x7f3824e60b66 - std[4a840e81aae3439]::sys_common::backtrace::__rust_end_short_backtrace::<std[4a840e81aae3439]::panicking::begin_panic<rustc_errors[74566eb9727f9d9c]::ExplicitBug>::{closure#0}, !>
  16:     0x7f3824e9d086 - std[4a840e81aae3439]::panicking::begin_panic::<rustc_errors[74566eb9727f9d9c]::ExplicitBug>
  17:     0x7f3824ea3872 - <rustc_errors[74566eb9727f9d9c]::HandlerInner>::span_bug::<rustc_span[624dabdd61f2978b]::span_encoding::Span, alloc[6fd48550c51b5745]::string::String>
  18:     0x7f3824ea3636 - <rustc_errors[74566eb9727f9d9c]::Handler>::span_bug::<rustc_span[624dabdd61f2978b]::span_encoding::Span, alloc[6fd48550c51b5745]::string::String>
  19:     0x7f3824e61eed - rustc_middle[9f74ec5cb00a905a]::util::bug::opt_span_bug_fmt::<rustc_span[624dabdd61f2978b]::span_encoding::Span>::{closure#0}
  20:     0x7f3824e61f1a - rustc_middle[9f74ec5cb00a905a]::ty::context::tls::with_opt::<rustc_middle[9f74ec5cb00a905a]::util::bug::opt_span_bug_fmt<rustc_span[624dabdd61f2978b]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  21:     0x7f3824e60bda - rustc_middle[9f74ec5cb00a905a]::ty::context::tls::with_context_opt::<rustc_middle[9f74ec5cb00a905a]::ty::context::tls::with_opt<rustc_middle[9f74ec5cb00a905a]::util::bug::opt_span_bug_fmt<rustc_span[624dabdd61f2978b]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  22:     0x7f382273be84 - rustc_middle[9f74ec5cb00a905a]::util::bug::span_bug_fmt::<rustc_span[624dabdd61f2978b]::span_encoding::Span>
  23:     0x7f382273be4b - <rustc_passes[108f699eb48b456]::liveness::Liveness>::propagate_through_expr
  24:     0x7f382273bef8 - <rustc_passes[108f699eb48b456]::liveness::Liveness>::propagate_through_block
  25:     0x7f382273bec3 - <rustc_passes[108f699eb48b456]::liveness::Liveness>::propagate_through_block
  26:     0x7f382273bec3 - <rustc_passes[108f699eb48b456]::liveness::Liveness>::propagate_through_block
  27:     0x7f3823b36e84 - rustc_passes[108f699eb48b456]::liveness::check_liveness
  28:     0x7f38225fc04c - rustc_query_impl[a5bf74a69bd3660]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[a5bf74a69bd3660]::query_impl::check_liveness::dynamic_query::{closure#2}::{closure#0}, rustc_middle[9f74ec5cb00a905a]::query::erase::Erased<[u8; 0usize]>>
  29:     0x7f3822c9ca2c - rustc_query_system[d65e888f3fe19f8d]::query::plumbing::try_execute_query::<rustc_query_impl[a5bf74a69bd3660]::DynamicConfig<rustc_query_system[d65e888f3fe19f8d]::query::caches::VecCache<rustc_span[624dabdd61f2978b]::def_id::LocalDefId, rustc_middle[9f74ec5cb00a905a]::query::erase::Erased<[u8; 0usize]>>, false, false, false>, rustc_query_impl[a5bf74a69bd3660]::plumbing::QueryCtxt, false>
  30:     0x7f3822c9c764 - rustc_query_impl[a5bf74a69bd3660]::query_impl::check_liveness::get_query_non_incr::__rust_end_short_backtrace
  31:     0x7f38234dc128 - rustc_mir_build[482a4e67a72838c0]::build::mir_built
  32:     0x7f382263fcbc - rustc_query_impl[a5bf74a69bd3660]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[a5bf74a69bd3660]::query_impl::mir_built::dynamic_query::{closure#2}::{closure#0}, rustc_middle[9f74ec5cb00a905a]::query::erase::Erased<[u8; 8usize]>>
  33:     0x7f382263fc9e - <rustc_query_impl[a5bf74a69bd3660]::query_impl::mir_built::dynamic_query::{closure#2} as core[6e72eb595340d7ba]::ops::function::FnOnce<(rustc_middle[9f74ec5cb00a905a]::ty::context::TyCtxt, rustc_span[624dabdd61f2978b]::def_id::LocalDefId)>>::call_once
  34:     0x7f382272891d - rustc_query_system[d65e888f3fe19f8d]::query::plumbing::try_execute_query::<rustc_query_impl[a5bf74a69bd3660]::DynamicConfig<rustc_query_system[d65e888f3fe19f8d]::query::caches::VecCache<rustc_span[624dabdd61f2978b]::def_id::LocalDefId, rustc_middle[9f74ec5cb00a905a]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[a5bf74a69bd3660]::plumbing::QueryCtxt, false>
  35:     0x7f3823fa7621 - rustc_query_impl[a5bf74a69bd3660]::query_impl::mir_built::get_query_non_incr::__rust_end_short_backtrace
  36:     0x7f38237333ec - rustc_mir_transform[3a72d7fd4a713ad]::check_unsafety::unsafety_check_result
  37:     0x7f382263fcfc - rustc_query_impl[a5bf74a69bd3660]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[a5bf74a69bd3660]::query_impl::unsafety_check_result::dynamic_query::{closure#2}::{closure#0}, rustc_middle[9f74ec5cb00a905a]::query::erase::Erased<[u8; 8usize]>>
  38:     0x7f382263fcde - <rustc_query_impl[a5bf74a69bd3660]::query_impl::unsafety_check_result::dynamic_query::{closure#2} as core[6e72eb595340d7ba]::ops::function::FnOnce<(rustc_middle[9f74ec5cb00a905a]::ty::context::TyCtxt, rustc_span[624dabdd61f2978b]::def_id::LocalDefId)>>::call_once
  39:     0x7f382272891d - rustc_query_system[d65e888f3fe19f8d]::query::plumbing::try_execute_query::<rustc_query_impl[a5bf74a69bd3660]::DynamicConfig<rustc_query_system[d65e888f3fe19f8d]::query::caches::VecCache<rustc_span[624dabdd61f2978b]::def_id::LocalDefId, rustc_middle[9f74ec5cb00a905a]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[a5bf74a69bd3660]::plumbing::QueryCtxt, false>
  40:     0x7f3823f9ee61 - rustc_query_impl[a5bf74a69bd3660]::query_impl::unsafety_check_result::get_query_non_incr::__rust_end_short_backtrace
  41:     0x7f38237368c8 - rustc_mir_transform[3a72d7fd4a713ad]::check_unsafety::unsafety_check_result
  42:     0x7f382263fcfc - rustc_query_impl[a5bf74a69bd3660]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[a5bf74a69bd3660]::query_impl::unsafety_check_result::dynamic_query::{closure#2}::{closure#0}, rustc_middle[9f74ec5cb00a905a]::query::erase::Erased<[u8; 8usize]>>
  43:     0x7f382263fcde - <rustc_query_impl[a5bf74a69bd3660]::query_impl::unsafety_check_result::dynamic_query::{closure#2} as core[6e72eb595340d7ba]::ops::function::FnOnce<(rustc_middle[9f74ec5cb00a905a]::ty::context::TyCtxt, rustc_span[624dabdd61f2978b]::def_id::LocalDefId)>>::call_once
  44:     0x7f382272891d - rustc_query_system[d65e888f3fe19f8d]::query::plumbing::try_execute_query::<rustc_query_impl[a5bf74a69bd3660]::DynamicConfig<rustc_query_system[d65e888f3fe19f8d]::query::caches::VecCache<rustc_span[624dabdd61f2978b]::def_id::LocalDefId, rustc_middle[9f74ec5cb00a905a]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[a5bf74a69bd3660]::plumbing::QueryCtxt, false>
  45:     0x7f3823f9ee61 - rustc_query_impl[a5bf74a69bd3660]::query_impl::unsafety_check_result::get_query_non_incr::__rust_end_short_backtrace
  46:     0x7f382399f3f4 - rustc_mir_transform[3a72d7fd4a713ad]::mir_const
  47:     0x7f3822653abe - rustc_query_impl[a5bf74a69bd3660]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[a5bf74a69bd3660]::query_impl::mir_const::dynamic_query::{closure#2}::{closure#0}, rustc_middle[9f74ec5cb00a905a]::query::erase::Erased<[u8; 8usize]>>
  48:     0x7f3822653a8e - <rustc_query_impl[a5bf74a69bd3660]::query_impl::mir_const::dynamic_query::{closure#2} as core[6e72eb595340d7ba]::ops::function::FnOnce<(rustc_middle[9f74ec5cb00a905a]::ty::context::TyCtxt, rustc_span[624dabdd61f2978b]::def_id::LocalDefId)>>::call_once
  49:     0x7f382272891d - rustc_query_system[d65e888f3fe19f8d]::query::plumbing::try_execute_query::<rustc_query_impl[a5bf74a69bd3660]::DynamicConfig<rustc_query_system[d65e888f3fe19f8d]::query::caches::VecCache<rustc_span[624dabdd61f2978b]::def_id::LocalDefId, rustc_middle[9f74ec5cb00a905a]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[a5bf74a69bd3660]::plumbing::QueryCtxt, false>
  50:     0x7f3823f967f1 - rustc_query_impl[a5bf74a69bd3660]::query_impl::mir_const::get_query_non_incr::__rust_end_short_backtrace
  51:     0x7f382286596d - rustc_mir_transform[3a72d7fd4a713ad]::mir_promoted
  52:     0x7f382263fd51 - rustc_query_impl[a5bf74a69bd3660]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[a5bf74a69bd3660]::query_impl::mir_promoted::dynamic_query::{closure#2}::{closure#0}, rustc_middle[9f74ec5cb00a905a]::query::erase::Erased<[u8; 16usize]>>
  53:     0x7f3822f62b6a - rustc_query_system[d65e888f3fe19f8d]::query::plumbing::try_execute_query::<rustc_query_impl[a5bf74a69bd3660]::DynamicConfig<rustc_query_system[d65e888f3fe19f8d]::query::caches::VecCache<rustc_span[624dabdd61f2978b]::def_id::LocalDefId, rustc_middle[9f74ec5cb00a905a]::query::erase::Erased<[u8; 16usize]>>, false, false, false>, rustc_query_impl[a5bf74a69bd3660]::plumbing::QueryCtxt, false>
  54:     0x7f3822f62857 - rustc_query_impl[a5bf74a69bd3660]::query_impl::mir_promoted::get_query_non_incr::__rust_end_short_backtrace
  55:     0x7f382350310c - rustc_borrowck[4c1300aba514ead]::mir_borrowck
  56:     0x7f3822653a5e - rustc_query_impl[a5bf74a69bd3660]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[a5bf74a69bd3660]::query_impl::mir_borrowck::dynamic_query::{closure#2}::{closure#0}, rustc_middle[9f74ec5cb00a905a]::query::erase::Erased<[u8; 8usize]>>
  57:     0x7f3822653a2e - <rustc_query_impl[a5bf74a69bd3660]::query_impl::mir_borrowck::dynamic_query::{closure#2} as core[6e72eb595340d7ba]::ops::function::FnOnce<(rustc_middle[9f74ec5cb00a905a]::ty::context::TyCtxt, rustc_span[624dabdd61f2978b]::def_id::LocalDefId)>>::call_once
  58:     0x7f382272891d - rustc_query_system[d65e888f3fe19f8d]::query::plumbing::try_execute_query::<rustc_query_impl[a5bf74a69bd3660]::DynamicConfig<rustc_query_system[d65e888f3fe19f8d]::query::caches::VecCache<rustc_span[624dabdd61f2978b]::def_id::LocalDefId, rustc_middle[9f74ec5cb00a905a]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[a5bf74a69bd3660]::plumbing::QueryCtxt, false>
  59:     0x7f3823faa841 - rustc_query_impl[a5bf74a69bd3660]::query_impl::mir_borrowck::get_query_non_incr::__rust_end_short_backtrace
  60:     0x7f38237c6bc5 - rustc_hir_analysis[5549e2304bca0734]::collect::type_of::opaque::find_opaque_ty_constraints_for_rpit
  61:     0x7f38237c37dc - rustc_hir_analysis[5549e2304bca0734]::collect::type_of::type_of
  62:     0x7f382274bf53 - rustc_query_impl[a5bf74a69bd3660]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[a5bf74a69bd3660]::query_impl::type_of::dynamic_query::{closure#2}::{closure#0}, rustc_middle[9f74ec5cb00a905a]::query::erase::Erased<[u8; 8usize]>>
  63:     0x7f382274bf10 - <rustc_query_impl[a5bf74a69bd3660]::query_impl::type_of::dynamic_query::{closure#2} as core[6e72eb595340d7ba]::ops::function::FnOnce<(rustc_middle[9f74ec5cb00a905a]::ty::context::TyCtxt, rustc_span[624dabdd61f2978b]::def_id::DefId)>>::call_once
  64:     0x7f3822650015 - rustc_query_system[d65e888f3fe19f8d]::query::plumbing::try_execute_query::<rustc_query_impl[a5bf74a69bd3660]::DynamicConfig<rustc_query_system[d65e888f3fe19f8d]::query::caches::DefaultCache<rustc_span[624dabdd61f2978b]::def_id::DefId, rustc_middle[9f74ec5cb00a905a]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[a5bf74a69bd3660]::plumbing::QueryCtxt, false>
  65:     0x7f3823f961f3 - rustc_query_impl[a5bf74a69bd3660]::query_impl::type_of::get_query_non_incr::__rust_end_short_backtrace
  66:     0x7f3823496796 - rustc_middle[9f74ec5cb00a905a]::query::plumbing::query_get_at::<rustc_query_system[d65e888f3fe19f8d]::query::caches::DefaultCache<rustc_span[624dabdd61f2978b]::def_id::DefId, rustc_middle[9f74ec5cb00a905a]::query::erase::Erased<[u8; 8usize]>>>
  67:     0x7f382349076c - rustc_hir_analysis[5549e2304bca0734]::check::check::check_mod_item_types
  68:     0x7f382321a71c - rustc_query_impl[a5bf74a69bd3660]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[a5bf74a69bd3660]::query_impl::check_mod_item_types::dynamic_query::{closure#2}::{closure#0}, rustc_middle[9f74ec5cb00a905a]::query::erase::Erased<[u8; 0usize]>>
  69:     0x7f382321a6fe - <rustc_query_impl[a5bf74a69bd3660]::query_impl::check_mod_item_types::dynamic_query::{closure#2} as core[6e72eb595340d7ba]::ops::function::FnOnce<(rustc_middle[9f74ec5cb00a905a]::ty::context::TyCtxt, rustc_span[624dabdd61f2978b]::def_id::LocalDefId)>>::call_once
  70:     0x7f3822c9cc7f - rustc_query_system[d65e888f3fe19f8d]::query::plumbing::try_execute_query::<rustc_query_impl[a5bf74a69bd3660]::DynamicConfig<rustc_query_system[d65e888f3fe19f8d]::query::caches::VecCache<rustc_span[624dabdd61f2978b]::def_id::LocalDefId, rustc_middle[9f74ec5cb00a905a]::query::erase::Erased<[u8; 0usize]>>, false, false, false>, rustc_query_impl[a5bf74a69bd3660]::plumbing::QueryCtxt, false>
  71:     0x7f3823fce5a4 - rustc_query_impl[a5bf74a69bd3660]::query_impl::check_mod_item_types::get_query_non_incr::__rust_end_short_backtrace
  72:     0x7f3823af3ea7 - <rustc_middle[9f74ec5cb00a905a]::hir::map::Map>::for_each_module::<rustc_hir_analysis[5549e2304bca0734]::check_crate::{closure#6}::{closure#0}>
  73:     0x7f3823af32dd - <rustc_session[a15a65f093e103e1]::session::Session>::time::<(), rustc_hir_analysis[5549e2304bca0734]::check_crate::{closure#6}>
  74:     0x7f3823af1e27 - rustc_hir_analysis[5549e2304bca0734]::check_crate
  75:     0x7f3823aea91a - rustc_interface[b943f00ad50b5541]::passes::analysis
  76:     0x7f3823b33aba - rustc_query_impl[a5bf74a69bd3660]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[a5bf74a69bd3660]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[9f74ec5cb00a905a]::query::erase::Erased<[u8; 1usize]>>
  77:     0x7f3823b33aa9 - <rustc_query_impl[a5bf74a69bd3660]::query_impl::analysis::dynamic_query::{closure#2} as core[6e72eb595340d7ba]::ops::function::FnOnce<(rustc_middle[9f74ec5cb00a905a]::ty::context::TyCtxt, ())>>::call_once
  78:     0x7f3823cb2da8 - rustc_query_system[d65e888f3fe19f8d]::query::plumbing::try_execute_query::<rustc_query_impl[a5bf74a69bd3660]::DynamicConfig<rustc_query_system[d65e888f3fe19f8d]::query::caches::SingleCache<rustc_middle[9f74ec5cb00a905a]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[a5bf74a69bd3660]::plumbing::QueryCtxt, false>
  79:     0x7f3823cb2b79 - rustc_query_impl[a5bf74a69bd3660]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  80:     0x7f3823c86a55 - <rustc_middle[9f74ec5cb00a905a]::ty::context::GlobalCtxt>::enter::<rustc_driver_impl[ea51492c730803db]::run_compiler::{closure#1}::{closure#2}::{closure#4}, core[6e72eb595340d7ba]::result::Result<(), rustc_span[624dabdd61f2978b]::ErrorGuaranteed>>
  81:     0x7f38238b9341 - <rustc_interface[b943f00ad50b5541]::interface::Compiler>::enter::<rustc_driver_impl[ea51492c730803db]::run_compiler::{closure#1}::{closure#2}, core[6e72eb595340d7ba]::result::Result<core[6e72eb595340d7ba]::option::Option<rustc_interface[b943f00ad50b5541]::queries::Linker>, rustc_span[624dabdd61f2978b]::ErrorGuaranteed>>
  82:     0x7f38238b4575 - rustc_span[624dabdd61f2978b]::set_source_map::<core[6e72eb595340d7ba]::result::Result<(), rustc_span[624dabdd61f2978b]::ErrorGuaranteed>, rustc_interface[b943f00ad50b5541]::interface::run_compiler<core[6e72eb595340d7ba]::result::Result<(), rustc_span[624dabdd61f2978b]::ErrorGuaranteed>, rustc_driver_impl[ea51492c730803db]::run_compiler::{closure#1}>::{closure#0}::{closure#0}>
  83:     0x7f38238b3996 - <scoped_tls[8088cff701f74b4a]::ScopedKey<rustc_span[624dabdd61f2978b]::SessionGlobals>>::set::<rustc_interface[b943f00ad50b5541]::interface::run_compiler<core[6e72eb595340d7ba]::result::Result<(), rustc_span[624dabdd61f2978b]::ErrorGuaranteed>, rustc_driver_impl[ea51492c730803db]::run_compiler::{closure#1}>::{closure#0}, core[6e72eb595340d7ba]::result::Result<(), rustc_span[624dabdd61f2978b]::ErrorGuaranteed>>
  84:     0x7f38238b2f46 - std[4a840e81aae3439]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[b943f00ad50b5541]::util::run_in_thread_pool_with_globals<rustc_interface[b943f00ad50b5541]::interface::run_compiler<core[6e72eb595340d7ba]::result::Result<(), rustc_span[624dabdd61f2978b]::ErrorGuaranteed>, rustc_driver_impl[ea51492c730803db]::run_compiler::{closure#1}>::{closure#0}, core[6e72eb595340d7ba]::result::Result<(), rustc_span[624dabdd61f2978b]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[6e72eb595340d7ba]::result::Result<(), rustc_span[624dabdd61f2978b]::ErrorGuaranteed>>
  85:     0x7f38238b2cee - <<std[4a840e81aae3439]::thread::Builder>::spawn_unchecked_<rustc_interface[b943f00ad50b5541]::util::run_in_thread_pool_with_globals<rustc_interface[b943f00ad50b5541]::interface::run_compiler<core[6e72eb595340d7ba]::result::Result<(), rustc_span[624dabdd61f2978b]::ErrorGuaranteed>, rustc_driver_impl[ea51492c730803db]::run_compiler::{closure#1}>::{closure#0}, core[6e72eb595340d7ba]::result::Result<(), rustc_span[624dabdd61f2978b]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[6e72eb595340d7ba]::result::Result<(), rustc_span[624dabdd61f2978b]::ErrorGuaranteed>>::{closure#1} as core[6e72eb595340d7ba]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  86:     0x7f3825835695 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h61eb867555625a06
                               at /rustc/5bd28f5eac1ba3569bfa8d49ec3f5acbdfdff7a0/library/alloc/src/boxed.rs:2010:9
  87:     0x7f3825835695 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hb80c29f89b136b72
                               at /rustc/5bd28f5eac1ba3569bfa8d49ec3f5acbdfdff7a0/library/alloc/src/boxed.rs:2010:9
  88:     0x7f3825835695 - std::sys::unix::thread::Thread::new::thread_start::hf4205715d65b27a6
                               at /rustc/5bd28f5eac1ba3569bfa8d49ec3f5acbdfdff7a0/library/std/src/sys/unix/thread.rs:108:17
  89:     0x7f382129d44b - <unknown>
  90:     0x7f3821320e40 - <unknown>
  91:                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: rustc 1.72.0-nightly (5bd28f5ea 2023-06-28) running on x86_64-unknown-linux-gnu

query stack during panic:
#0 [check_liveness] checking liveness of variables in `f999::{closure#0}`
#1 [mir_built] building MIR for `f999::{closure#0}`
#2 [unsafety_check_result] unsafety-checking `f999::{closure#0}`
#3 [unsafety_check_result] unsafety-checking `f999`
#4 [mir_const] preparing `f999` for borrow checking
#5 [mir_promoted] promoting constants in MIR for `f999`
#6 [mir_borrowck] borrow-checking `f999`
#7 [type_of] computing type of `f999::{opaque#0}`
#8 [check_mod_item_types] checking item types in top-level module
#9 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 4 previous errors

Some errors have detailed explanations: E0601, E0670, E0696.
For more information about an error, try `rustc --explain E0601`.

```

</p>
</details>