ICE: compiler/rustc_mir_transform/src/coroutine/by_move_body.rs: assertion failed: `i32 != &'{erased} mut i32`

[matthiaskrgr]

auto-reduced (treereduce-rust):

use std::future::Future;

pub fn async_closure_explicit_return_type(x: &mut i32) -> impl Future {
    (async move || -> &i32 {
        let y = &*x;
        *x += 1;
        y
    })()
}

original code

original:

//@ edition:2018
#![feature(async_closure)]
use std::future::Future;

// test the quality of annotations giving lifetimes names (`'1`) when async constructs are involved

pub async fn async_fn(x: &mut i32) -> &i32 {
    let y = &*x;
    *x += 1; //~ ERROR cannot assign to `*x` because it is borrowed
    y
}

pub fn async_closure(x: &mut i32) -> impl Future<Output=&i32> {
    (async move || {
        //~^ ERROR lifetime may not live long enough
        //~| ERROR temporary value dropped while borrowed
        let y = &*x;
        *x += 1; //~ ERROR cannot assign to `*x` because it is borrowed
        y
    })()
}

pub fn async_closure_explicit_return_type(x: &mut i32) -> impl Future<Output=&i32> {
    (async move || -> &i32 {
        //~^ ERROR lifetime may not live long enough
        //~| ERROR temporary value dropped while borrowed
        let y = &*x;
        *x += 1; //~ ERROR cannot assign to `*x` because it is borrowed
        y
    })()
}

pub fn async_block(x: &mut i32) -> impl Future<Output=&i32> {
    async move {
        let y = &*x;
        *x += 1; //~ ERROR cannot assign to `*x` because it is borrowed
        y
    }
}

fn main() {}

Version information

rustc 1.79.0-nightly (ceab6128f 2024-04-03)
binary: rustc
commit-hash: ceab6128fa48a616bfd3e3adf4bc80133b8ee223
commit-date: 2024-04-03
host: x86_64-unknown-linux-gnu
release: 1.79.0-nightly
LLVM version: 18.1.2

Command:
~/.rustup/toolchains/master/bin/rustc --edition=2021

Program output

error[E0658]: async closures are unstable
 --> /run/user/1085/tmp/dir.5rimT5Phzi6Y/rustc_testrunner_tmpdir_reporting.ujFwtCUisTnw/mvce.rs:4:6
  |
4 |     (async move || -> &i32 {
  |      ^^^^^
  |
  = note: see issue #62290 <https://github.com/rust-lang/rust/issues/62290> for more information
  = help: add `#![feature(async_closure)]` to the crate attributes to enable
  = note: this compiler was built on 2024-04-03; consider upgrading it if it is out of date
  = help: to use an async block, remove the `||`: `async {`

error[E0601]: `main` function not found in crate `mvce`
 --> /run/user/1085/tmp/dir.5rimT5Phzi6Y/rustc_testrunner_tmpdir_reporting.ujFwtCUisTnw/mvce.rs:9:2
  |
9 | }
  |  ^ consider adding a `main` function to `/run/user/1085/tmp/dir.5rimT5Phzi6Y/rustc_testrunner_tmpdir_reporting.ujFwtCUisTnw/mvce.rs`

thread 'rustc' panicked at compiler/rustc_mir_transform/src/coroutine/by_move_body.rs:136:13:
assertion `left == right` failed
  left: i32
 right: &'{erased} mut i32
stack backtrace:
   0:     0x7f48ce18cab5 - std::backtrace_rs::backtrace::libunwind::trace::he59ed1f6310a89db
                               at /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/std/src/../../backtrace/src/backtrace/libunwind.rs:105:5
   1:     0x7f48ce18cab5 - std::backtrace_rs::backtrace::trace_unsynchronized::h6df48fc4d4dfcd06
                               at /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f48ce18cab5 - std::sys_common::backtrace::_print_fmt::h913519b97242ff76
                               at /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/std/src/sys_common/backtrace.rs:68:5
   3:     0x7f48ce18cab5 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h13de4b2243b3529a
                               at /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f48ce1dbd0b - core::fmt::rt::Argument::fmt::h38359000df222df5
                               at /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/core/src/fmt/rt.rs:142:9
   5:     0x7f48ce1dbd0b - core::fmt::write::h09792d099db8c4ce
                               at /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/core/src/fmt/mod.rs:1153:17
   6:     0x7f48ce18169f - std::io::Write::write_fmt::h42e7b681a9beaf4e
                               at /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/std/src/io/mod.rs:1843:15
   7:     0x7f48ce18c88e - std::sys_common::backtrace::_print::h70f8b37b4f167097
                               at /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7f48ce18c88e - std::sys_common::backtrace::print::h27748824a837f210
                               at /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7f48ce18f2d9 - std::panicking::default_hook::{{closure}}::hc8fd06074a6fbb63
  10:     0x7f48ce18f043 - std::panicking::default_hook::ha4bd1ecab3ae33e7
                               at /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/std/src/panicking.rs:291:9
  11:     0x7f48d11fa9cf - std[ec819ecd34fca12]::panicking::update_hook::<alloc[56bab9db32d48932]::boxed::Box<rustc_driver_impl[813d23a455cd902c]::install_ice_hook::{closure#0}>>::{closure#0}
  12:     0x7f48ce18f9dc - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::hddd7415eba2a98b4
                               at /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/alloc/src/boxed.rs:2032:9
  13:     0x7f48ce18f9dc - std::panicking::rust_panic_with_hook::h087fd27556b6edb6
                               at /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/std/src/panicking.rs:792:13
  14:     0x7f48ce18f786 - std::panicking::begin_panic_handler::{{closure}}::hfba7f507ddcc9465
                               at /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/std/src/panicking.rs:657:13
  15:     0x7f48ce18cf79 - std::sys_common::backtrace::__rust_end_short_backtrace::h9a9f7575e226ea27
                               at /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/std/src/sys_common/backtrace.rs:171:18
  16:     0x7f48ce18f4b7 - rust_begin_unwind
                               at /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/std/src/panicking.rs:645:5
  17:     0x7f48ce1d81a6 - core::panicking::panic_fmt::h1705551aae729902
                               at /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/core/src/panicking.rs:72:14
  18:     0x7f48ce1d869e - core::panicking::assert_failed_inner::h00893e3fdeefe35d
                               at /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/core/src/panicking.rs:402:17
  19:     0x7f48d17cdb63 - core[6020f37af3fd38b3]::panicking::assert_failed::<rustc_middle[5fe173ea7043de96]::ty::Ty, rustc_middle[5fe173ea7043de96]::ty::Ty>
  20:     0x7f48d0980082 - <rustc_mir_transform[4405d1901a52c55b]::coroutine::by_move_body::ByMoveBody as rustc_middle[5fe173ea7043de96]::mir::MirPass>::run_pass
  21:     0x7f48d26018cd - rustc_mir_transform[4405d1901a52c55b]::pass_manager::run_passes_inner
  22:     0x7f48d2901c6b - rustc_query_impl[d334e283fae4920]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[d334e283fae4920]::query_impl::mir_built::dynamic_query::{closure#2}::{closure#0}, rustc_middle[5fe173ea7043de96]::query::erase::Erased<[u8; 8usize]>>
  23:     0x7f48d27adf71 - rustc_query_system[949e82a314b0255b]::query::plumbing::try_execute_query::<rustc_query_impl[d334e283fae4920]::DynamicConfig<rustc_query_system[949e82a314b0255b]::query::caches::VecCache<rustc_span[540eec0b4f93a280]::def_id::LocalDefId, rustc_middle[5fe173ea7043de96]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[d334e283fae4920]::plumbing::QueryCtxt, false>
  24:     0x7f48d27adb4c - rustc_query_impl[d334e283fae4920]::query_impl::mir_built::get_query_non_incr::__rust_end_short_backtrace
  25:     0x7f48d2d4ecd8 - rustc_mir_transform[4405d1901a52c55b]::ffi_unwind_calls::has_ffi_unwind_calls
  26:     0x7f48d2d4e797 - rustc_query_impl[d334e283fae4920]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[d334e283fae4920]::query_impl::has_ffi_unwind_calls::dynamic_query::{closure#2}::{closure#0}, rustc_middle[5fe173ea7043de96]::query::erase::Erased<[u8; 1usize]>>
  27:     0x7f48d2d4de3b - rustc_query_system[949e82a314b0255b]::query::plumbing::try_execute_query::<rustc_query_impl[d334e283fae4920]::DynamicConfig<rustc_query_system[949e82a314b0255b]::query::caches::VecCache<rustc_span[540eec0b4f93a280]::def_id::LocalDefId, rustc_middle[5fe173ea7043de96]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[d334e283fae4920]::plumbing::QueryCtxt, false>
  28:     0x7f48d2d4daff - rustc_query_impl[d334e283fae4920]::query_impl::has_ffi_unwind_calls::get_query_non_incr::__rust_end_short_backtrace
  29:     0x7f48d01d1063 - rustc_mir_transform[4405d1901a52c55b]::mir_promoted
  30:     0x7f48d2963b1a - rustc_query_impl[d334e283fae4920]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[d334e283fae4920]::query_impl::mir_promoted::dynamic_query::{closure#2}::{closure#0}, rustc_middle[5fe173ea7043de96]::query::erase::Erased<[u8; 16usize]>>
  31:     0x7f48d2963ded - rustc_query_system[949e82a314b0255b]::query::plumbing::try_execute_query::<rustc_query_impl[d334e283fae4920]::DynamicConfig<rustc_query_system[949e82a314b0255b]::query::caches::VecCache<rustc_span[540eec0b4f93a280]::def_id::LocalDefId, rustc_middle[5fe173ea7043de96]::query::erase::Erased<[u8; 16usize]>>, false, false, false>, rustc_query_impl[d334e283fae4920]::plumbing::QueryCtxt, false>
  32:     0x7f48d2963a23 - rustc_query_impl[d334e283fae4920]::query_impl::mir_promoted::get_query_non_incr::__rust_end_short_backtrace
  33:     0x7f48d27ac0b2 - rustc_borrowck[5a88212387f3128e]::mir_borrowck
  34:     0x7f48d27abfe7 - rustc_query_impl[d334e283fae4920]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[d334e283fae4920]::query_impl::mir_borrowck::dynamic_query::{closure#2}::{closure#0}, rustc_middle[5fe173ea7043de96]::query::erase::Erased<[u8; 8usize]>>
  35:     0x7f48d27adf71 - rustc_query_system[949e82a314b0255b]::query::plumbing::try_execute_query::<rustc_query_impl[d334e283fae4920]::DynamicConfig<rustc_query_system[949e82a314b0255b]::query::caches::VecCache<rustc_span[540eec0b4f93a280]::def_id::LocalDefId, rustc_middle[5fe173ea7043de96]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[d334e283fae4920]::plumbing::QueryCtxt, false>
  36:     0x7f48d27ada8c - rustc_query_impl[d334e283fae4920]::query_impl::mir_borrowck::get_query_non_incr::__rust_end_short_backtrace
  37:     0x7f48d3197602 - rustc_middle[5fe173ea7043de96]::query::plumbing::query_get_at::<rustc_query_system[949e82a314b0255b]::query::caches::VecCache<rustc_span[540eec0b4f93a280]::def_id::LocalDefId, rustc_middle[5fe173ea7043de96]::query::erase::Erased<[u8; 8usize]>>>
  38:     0x7f48d3197660 - <rustc_borrowck[5a88212387f3128e]::type_check::TypeChecker>::prove_closure_bounds
  39:     0x7f48d2b4c31f - <rustc_borrowck[5a88212387f3128e]::type_check::TypeChecker>::typeck_mir
  40:     0x7f48cf9ba043 - rustc_borrowck[5a88212387f3128e]::type_check::type_check
  41:     0x7f48cfc6ebba - rustc_borrowck[5a88212387f3128e]::nll::compute_regions
  42:     0x7f48d359b393 - rustc_borrowck[5a88212387f3128e]::do_mir_borrowck
  43:     0x7f48d27ac50a - rustc_borrowck[5a88212387f3128e]::mir_borrowck
  44:     0x7f48d27abfe7 - rustc_query_impl[d334e283fae4920]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[d334e283fae4920]::query_impl::mir_borrowck::dynamic_query::{closure#2}::{closure#0}, rustc_middle[5fe173ea7043de96]::query::erase::Erased<[u8; 8usize]>>
  45:     0x7f48d27adf71 - rustc_query_system[949e82a314b0255b]::query::plumbing::try_execute_query::<rustc_query_impl[d334e283fae4920]::DynamicConfig<rustc_query_system[949e82a314b0255b]::query::caches::VecCache<rustc_span[540eec0b4f93a280]::def_id::LocalDefId, rustc_middle[5fe173ea7043de96]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[d334e283fae4920]::plumbing::QueryCtxt, false>
  46:     0x7f48d27ada8c - rustc_query_impl[d334e283fae4920]::query_impl::mir_borrowck::get_query_non_incr::__rust_end_short_backtrace
  47:     0x7f48d3197602 - rustc_middle[5fe173ea7043de96]::query::plumbing::query_get_at::<rustc_query_system[949e82a314b0255b]::query::caches::VecCache<rustc_span[540eec0b4f93a280]::def_id::LocalDefId, rustc_middle[5fe173ea7043de96]::query::erase::Erased<[u8; 8usize]>>>
  48:     0x7f48d3197660 - <rustc_borrowck[5a88212387f3128e]::type_check::TypeChecker>::prove_closure_bounds
  49:     0x7f48d2b4c31f - <rustc_borrowck[5a88212387f3128e]::type_check::TypeChecker>::typeck_mir
  50:     0x7f48cf9ba043 - rustc_borrowck[5a88212387f3128e]::type_check::type_check
  51:     0x7f48cfc6ebba - rustc_borrowck[5a88212387f3128e]::nll::compute_regions
  52:     0x7f48d359b393 - rustc_borrowck[5a88212387f3128e]::do_mir_borrowck
  53:     0x7f48d27ac50a - rustc_borrowck[5a88212387f3128e]::mir_borrowck
  54:     0x7f48d27abfe7 - rustc_query_impl[d334e283fae4920]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[d334e283fae4920]::query_impl::mir_borrowck::dynamic_query::{closure#2}::{closure#0}, rustc_middle[5fe173ea7043de96]::query::erase::Erased<[u8; 8usize]>>
  55:     0x7f48d27adf71 - rustc_query_system[949e82a314b0255b]::query::plumbing::try_execute_query::<rustc_query_impl[d334e283fae4920]::DynamicConfig<rustc_query_system[949e82a314b0255b]::query::caches::VecCache<rustc_span[540eec0b4f93a280]::def_id::LocalDefId, rustc_middle[5fe173ea7043de96]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[d334e283fae4920]::plumbing::QueryCtxt, false>
  56:     0x7f48d27ada8c - rustc_query_impl[d334e283fae4920]::query_impl::mir_borrowck::get_query_non_incr::__rust_end_short_backtrace
  57:     0x7f48d2e5a3a1 - rustc_middle[5fe173ea7043de96]::query::plumbing::query_get_at::<rustc_query_system[949e82a314b0255b]::query::caches::VecCache<rustc_span[540eec0b4f93a280]::def_id::LocalDefId, rustc_middle[5fe173ea7043de96]::query::erase::Erased<[u8; 8usize]>>>
  58:     0x7f48d3358845 - rustc_hir_analysis[2010b50b941483c2]::collect::type_of::type_of_opaque
  59:     0x7f48d33586d5 - rustc_query_impl[d334e283fae4920]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[d334e283fae4920]::query_impl::type_of_opaque::dynamic_query::{closure#2}::{closure#0}, rustc_middle[5fe173ea7043de96]::query::erase::Erased<[u8; 8usize]>>
  60:     0x7f48d2796a21 - rustc_query_system[949e82a314b0255b]::query::plumbing::try_execute_query::<rustc_query_impl[d334e283fae4920]::DynamicConfig<rustc_query_system[949e82a314b0255b]::query::caches::DefIdCache<rustc_middle[5fe173ea7043de96]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[d334e283fae4920]::plumbing::QueryCtxt, false>
  61:     0x7f48d357105e - rustc_query_impl[d334e283fae4920]::query_impl::type_of_opaque::get_query_non_incr::__rust_end_short_backtrace
  62:     0x7f48d2793556 - rustc_middle[5fe173ea7043de96]::query::plumbing::query_get_at::<rustc_query_system[949e82a314b0255b]::query::caches::DefIdCache<rustc_middle[5fe173ea7043de96]::query::erase::Erased<[u8; 8usize]>>>
  63:     0x7f48d026ab8c - rustc_hir_analysis[2010b50b941483c2]::collect::type_of::type_of
  64:     0x7f48d2797de2 - rustc_query_impl[d334e283fae4920]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[d334e283fae4920]::query_impl::type_of::dynamic_query::{closure#2}::{closure#0}, rustc_middle[5fe173ea7043de96]::query::erase::Erased<[u8; 8usize]>>
  65:     0x7f48d2796a21 - rustc_query_system[949e82a314b0255b]::query::plumbing::try_execute_query::<rustc_query_impl[d334e283fae4920]::DynamicConfig<rustc_query_system[949e82a314b0255b]::query::caches::DefIdCache<rustc_middle[5fe173ea7043de96]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[d334e283fae4920]::plumbing::QueryCtxt, false>
  66:     0x7f48d279651b - rustc_query_impl[d334e283fae4920]::query_impl::type_of::get_query_non_incr::__rust_end_short_backtrace
  67:     0x7f48d2793556 - rustc_middle[5fe173ea7043de96]::query::plumbing::query_get_at::<rustc_query_system[949e82a314b0255b]::query::caches::DefIdCache<rustc_middle[5fe173ea7043de96]::query::erase::Erased<[u8; 8usize]>>>
  68:     0x7f48d351421d - rustc_hir_analysis[2010b50b941483c2]::check::check::check_item_type
  69:     0x7f48d2c8ac12 - rustc_hir_analysis[2010b50b941483c2]::check::wfcheck::check_well_formed
  70:     0x7f48d2c896e1 - rustc_query_impl[d334e283fae4920]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[d334e283fae4920]::query_impl::check_well_formed::dynamic_query::{closure#2}::{closure#0}, rustc_middle[5fe173ea7043de96]::query::erase::Erased<[u8; 1usize]>>
  71:     0x7f48d2c88e80 - rustc_query_system[949e82a314b0255b]::query::plumbing::try_execute_query::<rustc_query_impl[d334e283fae4920]::DynamicConfig<rustc_query_system[949e82a314b0255b]::query::caches::VecCache<rustc_hir[927083c3ea5abb61]::hir_id::OwnerId, rustc_middle[5fe173ea7043de96]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[d334e283fae4920]::plumbing::QueryCtxt, false>
  72:     0x7f48d2c88bff - rustc_query_impl[d334e283fae4920]::query_impl::check_well_formed::get_query_non_incr::__rust_end_short_backtrace
  73:     0x7f48d2c86b3a - rustc_hir_analysis[2010b50b941483c2]::check::wfcheck::check_mod_type_wf
  74:     0x7f48d2c86961 - rustc_query_impl[d334e283fae4920]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[d334e283fae4920]::query_impl::check_mod_type_wf::dynamic_query::{closure#2}::{closure#0}, rustc_middle[5fe173ea7043de96]::query::erase::Erased<[u8; 1usize]>>
  75:     0x7f48d3128c70 - rustc_query_system[949e82a314b0255b]::query::plumbing::try_execute_query::<rustc_query_impl[d334e283fae4920]::DynamicConfig<rustc_query_system[949e82a314b0255b]::query::caches::DefaultCache<rustc_span[540eec0b4f93a280]::def_id::LocalModDefId, rustc_middle[5fe173ea7043de96]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[d334e283fae4920]::plumbing::QueryCtxt, false>
  76:     0x7f48d3128a1b - rustc_query_impl[d334e283fae4920]::query_impl::check_mod_type_wf::get_query_non_incr::__rust_end_short_backtrace
  77:     0x7f48d27a863b - rustc_hir_analysis[2010b50b941483c2]::check_crate
  78:     0x7f48d2af312a - rustc_interface[760585401d993596]::passes::analysis
  79:     0x7f48d2af2c9b - rustc_query_impl[d334e283fae4920]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[d334e283fae4920]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[5fe173ea7043de96]::query::erase::Erased<[u8; 1usize]>>
  80:     0x7f48d33a2525 - rustc_query_system[949e82a314b0255b]::query::plumbing::try_execute_query::<rustc_query_impl[d334e283fae4920]::DynamicConfig<rustc_query_system[949e82a314b0255b]::query::caches::SingleCache<rustc_middle[5fe173ea7043de96]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[d334e283fae4920]::plumbing::QueryCtxt, false>
  81:     0x7f48d33a2289 - rustc_query_impl[d334e283fae4920]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  82:     0x7f48d323e8a2 - rustc_interface[760585401d993596]::interface::run_compiler::<core[6020f37af3fd38b3]::result::Result<(), rustc_span[540eec0b4f93a280]::ErrorGuaranteed>, rustc_driver_impl[813d23a455cd902c]::run_compiler::{closure#0}>::{closure#0}
  83:     0x7f48d3308c99 - std[ec819ecd34fca12]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[760585401d993596]::util::run_in_thread_with_globals<rustc_interface[760585401d993596]::util::run_in_thread_pool_with_globals<rustc_interface[760585401d993596]::interface::run_compiler<core[6020f37af3fd38b3]::result::Result<(), rustc_span[540eec0b4f93a280]::ErrorGuaranteed>, rustc_driver_impl[813d23a455cd902c]::run_compiler::{closure#0}>::{closure#0}, core[6020f37af3fd38b3]::result::Result<(), rustc_span[540eec0b4f93a280]::ErrorGuaranteed>>::{closure#0}, core[6020f37af3fd38b3]::result::Result<(), rustc_span[540eec0b4f93a280]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[6020f37af3fd38b3]::result::Result<(), rustc_span[540eec0b4f93a280]::ErrorGuaranteed>>
  84:     0x7f48d3308aa7 - <<std[ec819ecd34fca12]::thread::Builder>::spawn_unchecked_<rustc_interface[760585401d993596]::util::run_in_thread_with_globals<rustc_interface[760585401d993596]::util::run_in_thread_pool_with_globals<rustc_interface[760585401d993596]::interface::run_compiler<core[6020f37af3fd38b3]::result::Result<(), rustc_span[540eec0b4f93a280]::ErrorGuaranteed>, rustc_driver_impl[813d23a455cd902c]::run_compiler::{closure#0}>::{closure#0}, core[6020f37af3fd38b3]::result::Result<(), rustc_span[540eec0b4f93a280]::ErrorGuaranteed>>::{closure#0}, core[6020f37af3fd38b3]::result::Result<(), rustc_span[540eec0b4f93a280]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[6020f37af3fd38b3]::result::Result<(), rustc_span[540eec0b4f93a280]::ErrorGuaranteed>>::{closure#1} as core[6020f37af3fd38b3]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  85:     0x7f48ce1993fb - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h2f3fe605c6a4cca2
                               at /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/alloc/src/boxed.rs:2018:9
  86:     0x7f48ce1993fb - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::ha91f5459b929b1aa
                               at /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/alloc/src/boxed.rs:2018:9
  87:     0x7f48ce1993fb - std::sys::pal::unix::thread::Thread::new::thread_start::h15995726dd0d0cf4
                               at /rustc/ceab6128fa48a616bfd3e3adf4bc80133b8ee223/library/std/src/sys/pal/unix/thread.rs:108:17
  88:     0x7f48cde94ac3 - start_thread
                               at ./nptl/pthread_create.c:442:8
  89:     0x7f48cdf26850 - __GI___clone3
                               at ./misc/../sysdeps/unix/sysv/linux/x86_64/clone3.S:81
  90:                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 1.79.0-nightly (ceab6128f 2024-04-03) running on x86_64-unknown-linux-gnu

note: compiler flags: -Z dump-mir-dir=dir

query stack during panic:
#0 [mir_built] building MIR for `async_closure_explicit_return_type::{closure#0}::{closure#0}`
#1 [has_ffi_unwind_calls] checking if `async_closure_explicit_return_type::{closure#0}::{closure#0}` contains FFI-unwind calls
#2 [mir_promoted] promoting constants in MIR for `async_closure_explicit_return_type::{closure#0}::{closure#0}`
#3 [mir_borrowck] borrow-checking `async_closure_explicit_return_type::{closure#0}::{closure#0}`
#4 [mir_borrowck] borrow-checking `async_closure_explicit_return_type::{closure#0}`
#5 [mir_borrowck] borrow-checking `async_closure_explicit_return_type`
#6 [type_of_opaque] computing type of opaque `async_closure_explicit_return_type::{opaque#0}`
#7 [type_of] computing type of `async_closure_explicit_return_type::{opaque#0}`
#8 [check_well_formed] checking that `async_closure_explicit_return_type::{opaque#0}` is well-formed
#9 [check_mod_type_wf] checking that types are well-formed in top-level module
#10 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 2 previous errors

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

[compiler-errors]

this was fixed