ICE: `ConstContext::Maybe must have host effect param` during `mir_const_qualif`

[matthiaskrgr]

snippet:

#![feature(effects)]

trait MyTrait {}

impl MyTrait for i32 {
    async const fn bar(&self) {
        main8().await;
    }
}

Version information

rustc 1.77.0-nightly (5ad7454f7 2024-01-30)
binary: rustc
commit-hash: 5ad7454f7503b6af2800bf4a7c875962cb03f913
commit-date: 2024-01-30
host: x86_64-unknown-linux-gnu
release: 1.77.0-nightly
LLVM version: 17.0.6

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

Program output

error[E0670]: `async fn` is not permitted in Rust 2015
 --> /tmp/icemaker_global_tempdir.ZCOl2eTvAa4g/rustc_testrunner_tmpdir_reporting.XctsYzGJPJML/mvce.rs:6:5
  |
6 |     async const fn bar(&self) {
  |     ^^^^^ 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: expected one of `extern`, `fn`, or `unsafe`, found keyword `const`
 --> /tmp/icemaker_global_tempdir.ZCOl2eTvAa4g/rustc_testrunner_tmpdir_reporting.XctsYzGJPJML/mvce.rs:6:11
  |
6 |     async const fn bar(&self) {
  |     ------^^^^^
  |     |     |
  |     |     expected one of `extern`, `fn`, or `unsafe`
  |     help: `const` must come before `async`: `const async`
  |
  = note: keyword order for functions declaration is `pub`, `default`, `const`, `async`, `unsafe`, `extern`

error[E0379]: functions in trait impls cannot be declared const
 --> /tmp/icemaker_global_tempdir.ZCOl2eTvAa4g/rustc_testrunner_tmpdir_reporting.XctsYzGJPJML/mvce.rs:6:11
  |
6 |     async const fn bar(&self) {
  |           ^^^^^-
  |           |
  |           functions in trait impls cannot be const
  |           help: remove the `const`

error: functions cannot be both `const` and `async`
 --> /tmp/icemaker_global_tempdir.ZCOl2eTvAa4g/rustc_testrunner_tmpdir_reporting.XctsYzGJPJML/mvce.rs:6:5
  |
6 |       async const fn bar(&self) {
  |       -^^^^ ^^^^^ `const` because of this
  |       |
  |  _____`async` because of this
  | |
7 | |         main8().await;
8 | |     }
  | |_____-

error[E0407]: method `bar` is not a member of trait `MyTrait`
 --> /tmp/icemaker_global_tempdir.ZCOl2eTvAa4g/rustc_testrunner_tmpdir_reporting.XctsYzGJPJML/mvce.rs:6:5
  |
6 | /     async const fn bar(&self) {
7 | |         main8().await;
8 | |     }
  | |_____^ not a member of trait `MyTrait`

error[E0601]: `main` function not found in crate `mvce`
 --> /tmp/icemaker_global_tempdir.ZCOl2eTvAa4g/rustc_testrunner_tmpdir_reporting.XctsYzGJPJML/mvce.rs:9:2
  |
9 | }
  |  ^ consider adding a `main` function to `/tmp/icemaker_global_tempdir.ZCOl2eTvAa4g/rustc_testrunner_tmpdir_reporting.XctsYzGJPJML/mvce.rs`

error[E0425]: cannot find function `main8` in this scope
 --> /tmp/icemaker_global_tempdir.ZCOl2eTvAa4g/rustc_testrunner_tmpdir_reporting.XctsYzGJPJML/mvce.rs:7:9
  |
7 |         main8().await;
  |         ^^^^^ not found in this scope

thread 'rustc' panicked at /rustc/5ad7454f7503b6af2800bf4a7c875962cb03f913/compiler/rustc_middle/src/ty/util.rs:849:22:
ConstContext::Maybe must have host effect param
stack backtrace:
   0:     0x7fe94098bd16 - std::backtrace_rs::backtrace::libunwind::trace::h72011ad491b66ea7
                               at /rustc/5ad7454f7503b6af2800bf4a7c875962cb03f913/library/std/src/../../backtrace/src/backtrace/libunwind.rs:104:5
   1:     0x7fe94098bd16 - std::backtrace_rs::backtrace::trace_unsynchronized::hfacfcb070c9bf6a6
                               at /rustc/5ad7454f7503b6af2800bf4a7c875962cb03f913/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7fe94098bd16 - std::sys_common::backtrace::_print_fmt::h64d60c4b8318f4c9
                               at /rustc/5ad7454f7503b6af2800bf4a7c875962cb03f913/library/std/src/sys_common/backtrace.rs:68:5
   3:     0x7fe94098bd16 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hc0b55d074420c4c8
                               at /rustc/5ad7454f7503b6af2800bf4a7c875962cb03f913/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7fe9409de770 - core::fmt::rt::Argument::fmt::h44d828cd3f08e434
                               at /rustc/5ad7454f7503b6af2800bf4a7c875962cb03f913/library/core/src/fmt/rt.rs:142:9
   5:     0x7fe9409de770 - core::fmt::write::h654173c004ce0000
                               at /rustc/5ad7454f7503b6af2800bf4a7c875962cb03f913/library/core/src/fmt/mod.rs:1120:17
   6:     0x7fe94097f58f - std::io::Write::write_fmt::h194317de3dd2a616
                               at /rustc/5ad7454f7503b6af2800bf4a7c875962cb03f913/library/std/src/io/mod.rs:1846:15
   7:     0x7fe94098baf4 - std::sys_common::backtrace::_print::h85f84de9daadd08a
                               at /rustc/5ad7454f7503b6af2800bf4a7c875962cb03f913/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7fe94098baf4 - std::sys_common::backtrace::print::h39e3018c7025e846
                               at /rustc/5ad7454f7503b6af2800bf4a7c875962cb03f913/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7fe94098e887 - std::panicking::default_hook::{{closure}}::h11f92b8affe5382f
  10:     0x7fe94098e5e9 - std::panicking::default_hook::h900ee4bcbdf7c192
                               at /rustc/5ad7454f7503b6af2800bf4a7c875962cb03f913/library/std/src/panicking.rs:292:9
  11:     0x7fe9437399ac - std[54f701ff8bed27ba]::panicking::update_hook::<alloc[a83636b43d09c3d5]::boxed::Box<rustc_driver_impl[992ec5f4edbde9dd]::install_ice_hook::{closure#0}>>::{closure#0}
  12:     0x7fe94098efd6 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h62f7a9d0498f9b9a
                               at /rustc/5ad7454f7503b6af2800bf4a7c875962cb03f913/library/alloc/src/boxed.rs:2029:9
  13:     0x7fe94098efd6 - std::panicking::rust_panic_with_hook::h065109c06807d74c
                               at /rustc/5ad7454f7503b6af2800bf4a7c875962cb03f913/library/std/src/panicking.rs:785:13
  14:     0x7fe94098ed22 - std::panicking::begin_panic_handler::{{closure}}::h457f22862e58d32b
                               at /rustc/5ad7454f7503b6af2800bf4a7c875962cb03f913/library/std/src/panicking.rs:659:13
  15:     0x7fe94098c216 - std::sys_common::backtrace::__rust_end_short_backtrace::h987aced00b7d9afd
                               at /rustc/5ad7454f7503b6af2800bf4a7c875962cb03f913/library/std/src/sys_common/backtrace.rs:171:18
  16:     0x7fe94098ea74 - rust_begin_unwind
                               at /rustc/5ad7454f7503b6af2800bf4a7c875962cb03f913/library/std/src/panicking.rs:647:5
  17:     0x7fe9409dae75 - core::panicking::panic_fmt::h20b16f9144caec1a
                               at /rustc/5ad7454f7503b6af2800bf4a7c875962cb03f913/library/core/src/panicking.rs:72:14
  18:     0x7fe9409dac23 - core::panicking::panic_display::h0773fce420d2dbf5
                               at /rustc/5ad7454f7503b6af2800bf4a7c875962cb03f913/library/core/src/panicking.rs:196:5
  19:     0x7fe9409dac23 - core::panicking::panic_str::hedede5899ebcc889
                               at /rustc/5ad7454f7503b6af2800bf4a7c875962cb03f913/library/core/src/panicking.rs:171:5
  20:     0x7fe9409dac23 - core::option::expect_failed::hee098f6d386fc871
                               at /rustc/5ad7454f7503b6af2800bf4a7c875962cb03f913/library/core/src/option.rs:1988:5
  21:     0x7fe9455e2974 - <rustc_const_eval[ed0987334911aac2]::transform::check_consts::qualifs::NeedsNonConstDrop as rustc_const_eval[ed0987334911aac2]::transform::check_consts::qualifs::Qualif>::in_any_value_of_ty
  22:     0x7fe94370280e - rustc_const_eval[ed0987334911aac2]::transform::check_consts::qualifs::in_any_value_of_ty
  23:     0x7fe94506db0e - <rustc_const_eval[ed0987334911aac2]::transform::check_consts::check::Checker>::qualifs_in_return_place
  24:     0x7fe94506c4f3 - rustc_mir_transform[57db4c8326afd1a4]::mir_const_qualif
  25:     0x7fe94506c3af - rustc_query_impl[10ab52a21a26d451]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[10ab52a21a26d451]::query_impl::mir_const_qualif::dynamic_query::{closure#2}::{closure#0}, rustc_middle[19997e6f7f752aa2]::query::erase::Erased<[u8; 5usize]>>
  26:     0x7fe94506b688 - rustc_query_system[30b737ba6490e87b]::query::plumbing::try_execute_query::<rustc_query_impl[10ab52a21a26d451]::DynamicConfig<rustc_query_system[30b737ba6490e87b]::query::caches::DefIdCache<rustc_middle[19997e6f7f752aa2]::query::erase::Erased<[u8; 5usize]>>, false, false, false>, rustc_query_impl[10ab52a21a26d451]::plumbing::QueryCtxt, false>
  27:     0x7fe94506b3f4 - rustc_query_impl[10ab52a21a26d451]::query_impl::mir_const_qualif::get_query_non_incr::__rust_end_short_backtrace
  28:     0x7fe94506b20f - rustc_middle[19997e6f7f752aa2]::query::plumbing::query_get_at::<rustc_query_system[30b737ba6490e87b]::query::caches::DefIdCache<rustc_middle[19997e6f7f752aa2]::query::erase::Erased<[u8; 5usize]>>>
  29:     0x7fe942c46081 - rustc_mir_transform[57db4c8326afd1a4]::mir_promoted
  30:     0x7fe944ebbc12 - rustc_query_impl[10ab52a21a26d451]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[10ab52a21a26d451]::query_impl::mir_promoted::dynamic_query::{closure#2}::{closure#0}, rustc_middle[19997e6f7f752aa2]::query::erase::Erased<[u8; 16usize]>>
  31:     0x7fe944ebbedc - rustc_query_system[30b737ba6490e87b]::query::plumbing::try_execute_query::<rustc_query_impl[10ab52a21a26d451]::DynamicConfig<rustc_query_system[30b737ba6490e87b]::query::caches::VecCache<rustc_span[f474d682e4803cf6]::def_id::LocalDefId, rustc_middle[19997e6f7f752aa2]::query::erase::Erased<[u8; 16usize]>>, false, false, false>, rustc_query_impl[10ab52a21a26d451]::plumbing::QueryCtxt, false>
  32:     0x7fe945806617 - rustc_query_impl[10ab52a21a26d451]::query_impl::mir_promoted::get_query_non_incr::__rust_end_short_backtrace
  33:     0x7fe94580672e - rustc_borrowck[475c3940e0bbd71e]::mir_borrowck
  34:     0x7fe94580665b - rustc_query_impl[10ab52a21a26d451]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[10ab52a21a26d451]::query_impl::mir_borrowck::dynamic_query::{closure#2}::{closure#0}, rustc_middle[19997e6f7f752aa2]::query::erase::Erased<[u8; 8usize]>>
  35:     0x7fe944d447f9 - rustc_query_system[30b737ba6490e87b]::query::plumbing::try_execute_query::<rustc_query_impl[10ab52a21a26d451]::DynamicConfig<rustc_query_system[30b737ba6490e87b]::query::caches::VecCache<rustc_span[f474d682e4803cf6]::def_id::LocalDefId, rustc_middle[19997e6f7f752aa2]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[10ab52a21a26d451]::plumbing::QueryCtxt, false>
  36:     0x7fe944d44250 - rustc_query_impl[10ab52a21a26d451]::query_impl::mir_borrowck::get_query_non_incr::__rust_end_short_backtrace
  37:     0x7fe9459ce62d - rustc_hir_analysis[fd66094b79b5f3c7]::collect::type_of::type_of_opaque
  38:     0x7fe9459ce2a7 - rustc_query_impl[10ab52a21a26d451]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[10ab52a21a26d451]::query_impl::type_of_opaque::dynamic_query::{closure#2}::{closure#0}, rustc_middle[19997e6f7f752aa2]::query::erase::Erased<[u8; 8usize]>>
  39:     0x7fe944a72621 - rustc_query_system[30b737ba6490e87b]::query::plumbing::try_execute_query::<rustc_query_impl[10ab52a21a26d451]::DynamicConfig<rustc_query_system[30b737ba6490e87b]::query::caches::DefIdCache<rustc_middle[19997e6f7f752aa2]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[10ab52a21a26d451]::plumbing::QueryCtxt, false>
  40:     0x7fe945a310de - rustc_query_impl[10ab52a21a26d451]::query_impl::type_of_opaque::get_query_non_incr::__rust_end_short_backtrace
  41:     0x7fe944bdd84f - rustc_middle[19997e6f7f752aa2]::query::plumbing::query_get_at::<rustc_query_system[30b737ba6490e87b]::query::caches::DefIdCache<rustc_middle[19997e6f7f752aa2]::query::erase::Erased<[u8; 8usize]>>>
  42:     0x7fe942c8fad8 - rustc_hir_analysis[fd66094b79b5f3c7]::collect::type_of::type_of
  43:     0x7fe944a739aa - rustc_query_impl[10ab52a21a26d451]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[10ab52a21a26d451]::query_impl::type_of::dynamic_query::{closure#2}::{closure#0}, rustc_middle[19997e6f7f752aa2]::query::erase::Erased<[u8; 8usize]>>
  44:     0x7fe944a72621 - rustc_query_system[30b737ba6490e87b]::query::plumbing::try_execute_query::<rustc_query_impl[10ab52a21a26d451]::DynamicConfig<rustc_query_system[30b737ba6490e87b]::query::caches::DefIdCache<rustc_middle[19997e6f7f752aa2]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[10ab52a21a26d451]::plumbing::QueryCtxt, false>
  45:     0x7fe944a721dd - rustc_query_impl[10ab52a21a26d451]::query_impl::type_of::get_query_non_incr::__rust_end_short_backtrace
  46:     0x7fe944bdd84f - rustc_middle[19997e6f7f752aa2]::query::plumbing::query_get_at::<rustc_query_system[30b737ba6490e87b]::query::caches::DefIdCache<rustc_middle[19997e6f7f752aa2]::query::erase::Erased<[u8; 8usize]>>>
  47:     0x7fe94546677b - rustc_hir_analysis[fd66094b79b5f3c7]::check::wfcheck::check_well_formed
  48:     0x7fe945463b19 - rustc_query_impl[10ab52a21a26d451]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[10ab52a21a26d451]::query_impl::check_well_formed::dynamic_query::{closure#2}::{closure#0}, rustc_middle[19997e6f7f752aa2]::query::erase::Erased<[u8; 1usize]>>
  49:     0x7fe9454631f1 - rustc_query_system[30b737ba6490e87b]::query::plumbing::try_execute_query::<rustc_query_impl[10ab52a21a26d451]::DynamicConfig<rustc_query_system[30b737ba6490e87b]::query::caches::VecCache<rustc_hir[43c3f5a0301c7221]::hir_id::OwnerId, rustc_middle[19997e6f7f752aa2]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[10ab52a21a26d451]::plumbing::QueryCtxt, false>
  50:     0x7fe945462f51 - rustc_query_impl[10ab52a21a26d451]::query_impl::check_well_formed::get_query_non_incr::__rust_end_short_backtrace
  51:     0x7fe945460d1c - rustc_hir_analysis[fd66094b79b5f3c7]::check::wfcheck::check_mod_type_wf
  52:     0x7fe945460c4d - rustc_query_impl[10ab52a21a26d451]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[10ab52a21a26d451]::query_impl::check_mod_type_wf::dynamic_query::{closure#2}::{closure#0}, rustc_middle[19997e6f7f752aa2]::query::erase::Erased<[u8; 1usize]>>
  53:     0x7fe94545ff3b - rustc_query_system[30b737ba6490e87b]::query::plumbing::try_execute_query::<rustc_query_impl[10ab52a21a26d451]::DynamicConfig<rustc_query_system[30b737ba6490e87b]::query::caches::DefaultCache<rustc_span[f474d682e4803cf6]::def_id::LocalModDefId, rustc_middle[19997e6f7f752aa2]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[10ab52a21a26d451]::plumbing::QueryCtxt, false>
  54:     0x7fe94545fc43 - rustc_query_impl[10ab52a21a26d451]::query_impl::check_mod_type_wf::get_query_non_incr::__rust_end_short_backtrace
  55:     0x7fe944d41d45 - rustc_middle[19997e6f7f752aa2]::query::plumbing::query_ensure_error_guaranteed::<rustc_query_system[30b737ba6490e87b]::query::caches::DefaultCache<rustc_span[f474d682e4803cf6]::def_id::LocalModDefId, rustc_middle[19997e6f7f752aa2]::query::erase::Erased<[u8; 1usize]>>, ()>
  56:     0x7fe944d42610 - rustc_hir_analysis[fd66094b79b5f3c7]::check_crate
  57:     0x7fe94532f412 - rustc_interface[1d601030f2bdc91b]::passes::analysis
  58:     0x7fe94532f05f - rustc_query_impl[10ab52a21a26d451]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[10ab52a21a26d451]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[19997e6f7f752aa2]::query::erase::Erased<[u8; 1usize]>>
  59:     0x7fe945990640 - rustc_query_system[30b737ba6490e87b]::query::plumbing::try_execute_query::<rustc_query_impl[10ab52a21a26d451]::DynamicConfig<rustc_query_system[30b737ba6490e87b]::query::caches::SingleCache<rustc_middle[19997e6f7f752aa2]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[10ab52a21a26d451]::plumbing::QueryCtxt, false>
  60:     0x7fe9459903b9 - rustc_query_impl[10ab52a21a26d451]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  61:     0x7fe9457055f6 - rustc_interface[1d601030f2bdc91b]::interface::run_compiler::<core[4c86ceb0893c3104]::result::Result<(), rustc_span[f474d682e4803cf6]::ErrorGuaranteed>, rustc_driver_impl[992ec5f4edbde9dd]::run_compiler::{closure#0}>::{closure#0}
  62:     0x7fe9453aa2ca - std[54f701ff8bed27ba]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[1d601030f2bdc91b]::util::run_in_thread_with_globals<rustc_interface[1d601030f2bdc91b]::util::run_in_thread_pool_with_globals<rustc_interface[1d601030f2bdc91b]::interface::run_compiler<core[4c86ceb0893c3104]::result::Result<(), rustc_span[f474d682e4803cf6]::ErrorGuaranteed>, rustc_driver_impl[992ec5f4edbde9dd]::run_compiler::{closure#0}>::{closure#0}, core[4c86ceb0893c3104]::result::Result<(), rustc_span[f474d682e4803cf6]::ErrorGuaranteed>>::{closure#0}, core[4c86ceb0893c3104]::result::Result<(), rustc_span[f474d682e4803cf6]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[4c86ceb0893c3104]::result::Result<(), rustc_span[f474d682e4803cf6]::ErrorGuaranteed>>
  63:     0x7fe9453aa0f9 - <<std[54f701ff8bed27ba]::thread::Builder>::spawn_unchecked_<rustc_interface[1d601030f2bdc91b]::util::run_in_thread_with_globals<rustc_interface[1d601030f2bdc91b]::util::run_in_thread_pool_with_globals<rustc_interface[1d601030f2bdc91b]::interface::run_compiler<core[4c86ceb0893c3104]::result::Result<(), rustc_span[f474d682e4803cf6]::ErrorGuaranteed>, rustc_driver_impl[992ec5f4edbde9dd]::run_compiler::{closure#0}>::{closure#0}, core[4c86ceb0893c3104]::result::Result<(), rustc_span[f474d682e4803cf6]::ErrorGuaranteed>>::{closure#0}, core[4c86ceb0893c3104]::result::Result<(), rustc_span[f474d682e4803cf6]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[4c86ceb0893c3104]::result::Result<(), rustc_span[f474d682e4803cf6]::ErrorGuaranteed>>::{closure#1} as core[4c86ceb0893c3104]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  64:     0x7fe940998675 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h3068c3095d2fc4ea
                               at /rustc/5ad7454f7503b6af2800bf4a7c875962cb03f913/library/alloc/src/boxed.rs:2015:9
  65:     0x7fe940998675 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::he2790d6b8e8cdd62
                               at /rustc/5ad7454f7503b6af2800bf4a7c875962cb03f913/library/alloc/src/boxed.rs:2015:9
  66:     0x7fe940998675 - std::sys::pal::unix::thread::Thread::new::thread_start::ha0d1468f9dded566
                               at /rustc/5ad7454f7503b6af2800bf4a7c875962cb03f913/library/std/src/sys/pal/unix/thread.rs:108:17
  67:     0x7fe9407839eb - <unknown>
  68:     0x7fe9408077cc - <unknown>
  69:                0x0 - <unknown>

error: the compiler unexpectedly panicked. this is a bug.

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 1.77.0-nightly (5ad7454f7 2024-01-30) running on x86_64-unknown-linux-gnu

query stack during panic:
#0 [mir_const_qualif] const checking `<impl at /tmp/icemaker_global_tempdir.ZCOl2eTvAa4g/rustc_testrunner_tmpdir_reporting.XctsYzGJPJML/mvce.rs:5:1: 5:21>::bar`
#1 [mir_promoted] promoting constants in MIR for `<impl at /tmp/icemaker_global_tempdir.ZCOl2eTvAa4g/rustc_testrunner_tmpdir_reporting.XctsYzGJPJML/mvce.rs:5:1: 5:21>::bar`
#2 [mir_borrowck] borrow-checking `<impl at /tmp/icemaker_global_tempdir.ZCOl2eTvAa4g/rustc_testrunner_tmpdir_reporting.XctsYzGJPJML/mvce.rs:5:1: 5:21>::bar`
#3 [type_of_opaque] computing type of opaque `<impl at /tmp/icemaker_global_tempdir.ZCOl2eTvAa4g/rustc_testrunner_tmpdir_reporting.XctsYzGJPJML/mvce.rs:5:1: 5:21>::bar::{opaque#0}`
#4 [type_of] computing type of `<impl at /tmp/icemaker_global_tempdir.ZCOl2eTvAa4g/rustc_testrunner_tmpdir_reporting.XctsYzGJPJML/mvce.rs:5:1: 5:21>::bar::{opaque#0}`
#5 [check_well_formed] checking that `<impl at /tmp/icemaker_global_tempdir.ZCOl2eTvAa4g/rustc_testrunner_tmpdir_reporting.XctsYzGJPJML/mvce.rs:5:1: 5:21>::bar::{opaque#0}` is well-formed
#6 [check_mod_type_wf] checking that types are well-formed in top-level module
#7 [analysis] running analysis passes on this crate
end of query stack
error[E0391]: cycle detected when computing type of opaque `<impl at /tmp/icemaker_global_tempdir.ZCOl2eTvAa4g/rustc_testrunner_tmpdir_reporting.XctsYzGJPJML/mvce.rs:5:1: 5:21>::bar::{opaque#0}`
 --> /tmp/icemaker_global_tempdir.ZCOl2eTvAa4g/rustc_testrunner_tmpdir_reporting.XctsYzGJPJML/mvce.rs:6:5
  |
6 |     async const fn bar(&self) {
  |     ^^^^^^^^^^^^^^^^^^^^^^^^^
  |
note: ...which requires borrow-checking `<impl at /tmp/icemaker_global_tempdir.ZCOl2eTvAa4g/rustc_testrunner_tmpdir_reporting.XctsYzGJPJML/mvce.rs:5:1: 5:21>::bar`...
 --> /tmp/icemaker_global_tempdir.ZCOl2eTvAa4g/rustc_testrunner_tmpdir_reporting.XctsYzGJPJML/mvce.rs:6:5
  |
6 |     async const fn bar(&self) {
  |     ^^^^^^^^^^^^^^^^^^^^^^^^^
note: ...which requires promoting constants in MIR for `<impl at /tmp/icemaker_global_tempdir.ZCOl2eTvAa4g/rustc_testrunner_tmpdir_reporting.XctsYzGJPJML/mvce.rs:5:1: 5:21>::bar`...
 --> /tmp/icemaker_global_tempdir.ZCOl2eTvAa4g/rustc_testrunner_tmpdir_reporting.XctsYzGJPJML/mvce.rs:6:5
  |
6 |     async const fn bar(&self) {
  |     ^^^^^^^^^^^^^^^^^^^^^^^^^
note: ...which requires const checking `<impl at /tmp/icemaker_global_tempdir.ZCOl2eTvAa4g/rustc_testrunner_tmpdir_reporting.XctsYzGJPJML/mvce.rs:5:1: 5:21>::bar`...
 --> /tmp/icemaker_global_tempdir.ZCOl2eTvAa4g/rustc_testrunner_tmpdir_reporting.XctsYzGJPJML/mvce.rs:6:5
  |
6 |     async const fn bar(&self) {
  |     ^^^^^^^^^^^^^^^^^^^^^^^^^
  = note: ...which requires computing whether `<impl at /tmp/icemaker_global_tempdir.ZCOl2eTvAa4g/rustc_testrunner_tmpdir_reporting.XctsYzGJPJML/mvce.rs:5:1: 5:21>::bar::{opaque#0}` is freeze...
  = note: ...which requires evaluating trait selection obligation `<impl at /tmp/icemaker_global_tempdir.ZCOl2eTvAa4g/rustc_testrunner_tmpdir_reporting.XctsYzGJPJML/mvce.rs:5:1: 5:21>::bar::{opaque#0}: core::marker::Freeze`...
  = note: ...which again requires computing type of opaque `<impl at /tmp/icemaker_global_tempdir.ZCOl2eTvAa4g/rustc_testrunner_tmpdir_reporting.XctsYzGJPJML/mvce.rs:5:1: 5:21>::bar::{opaque#0}`, completing the cycle
note: cycle used when computing type of `<impl at /tmp/icemaker_global_tempdir.ZCOl2eTvAa4g/rustc_testrunner_tmpdir_reporting.XctsYzGJPJML/mvce.rs:5:1: 5:21>::bar::{opaque#0}`
 --> /tmp/icemaker_global_tempdir.ZCOl2eTvAa4g/rustc_testrunner_tmpdir_reporting.XctsYzGJPJML/mvce.rs:6:5
  |
6 |     async const fn bar(&self) {
  |     ^^^^^^^^^^^^^^^^^^^^^^^^^
  = note: see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information

error: aborting due to 8 previous errors

Some errors have detailed explanations: E0379, E0391, E0407, E0425, E0601, E0670.
For more information about an error, try `rustc --explain E0379`.

[matthiaskrgr]

This one seems different from #118320 as it gets beyond type checking but crashes in mir_const_qualif.
Bisects to Regression in nightly-2024-01-04
I suspect this crashes since #119505 cc @fmease 🤔

[traviscross]

@rustbot labels +AsyncAwait-Triaged +WG-async

We reviewed this today in WG-async triage. We agree this is a bug.