ICE: gce: `expected type of closure to be a closure`

[matthiaskrgr]

auto-reduced (treereduce-rust):

#![feature(generic_const_exprs)]

async fn foo<'a>() {
    let _data = &mut [0u8; { N + (|| 42)() }];
}

original:

// edition:2018
//~^ ERROR overly complex generic constant

#![allow(incomplete_features)]
#![feature(generic_const_exprs)]

#[allow(unused)]
async fn foo<'a>() {
    let _data = &mut [0u8; { N + (|| 42)() }];
    bar().await
}

async fn bar() {}

fn main() {}

Version information

rustc 1.77.0-nightly (1ab783112 2023-12-26)
binary: rustc
commit-hash: 1ab783112ab4e4807304dbd249b39771246013ef
commit-date: 2023-12-26
host: x86_64-unknown-linux-gnu
release: 1.77.0-nightly
LLVM version: 17.0.6

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

Program output

error[E0425]: cannot find value `N` in this scope
 --> /tmp/icemaker_global_tempdir.Y0ACAS7jpz8y/rustc_testrunner_tmpdir_reporting.1VBmKbaJnVwY/mvce.rs:4:30
  |
4 |     let _data = &mut [0u8; { N + (|| 42)() }];
  |                              ^ not found in this scope
  |
help: you might be missing a const parameter
  |
3 | async fn foo<'a, const N: /* Type */>() {
  |                +++++++++++++++++++++

warning: the feature `generic_const_exprs` is incomplete and may not be safe to use and/or cause compiler crashes
 --> /tmp/icemaker_global_tempdir.Y0ACAS7jpz8y/rustc_testrunner_tmpdir_reporting.1VBmKbaJnVwY/mvce.rs:1:12
  |
1 | #![feature(generic_const_exprs)]
  |            ^^^^^^^^^^^^^^^^^^^
  |
  = note: see issue #76560 <https://github.com/rust-lang/rust/issues/76560> for more information
  = note: `#[warn(incomplete_features)]` on by default

error[E0601]: `main` function not found in crate `mvce`
 --> /tmp/icemaker_global_tempdir.Y0ACAS7jpz8y/rustc_testrunner_tmpdir_reporting.1VBmKbaJnVwY/mvce.rs:5:2
  |
5 | }
  |  ^ consider adding a `main` function to `/tmp/icemaker_global_tempdir.Y0ACAS7jpz8y/rustc_testrunner_tmpdir_reporting.1VBmKbaJnVwY/mvce.rs`

error: internal compiler error: compiler/rustc_mir_build/src/build/mod.rs:660:17: expected type of closure to be a closure

thread 'rustc' panicked at /rustc/1ab783112ab4e4807304dbd249b39771246013ef/compiler/rustc_errors/src/lib.rs:1068:30:
Box<dyn Any>
stack backtrace:
   0:     0x7f491dd8b6f6 - std::backtrace_rs::backtrace::libunwind::trace::h348a88e16d87236b
                               at /rustc/1ab783112ab4e4807304dbd249b39771246013ef/library/std/src/../../backtrace/src/backtrace/libunwind.rs:104:5
   1:     0x7f491dd8b6f6 - std::backtrace_rs::backtrace::trace_unsynchronized::h171f2dab50688579
                               at /rustc/1ab783112ab4e4807304dbd249b39771246013ef/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f491dd8b6f6 - std::sys_common::backtrace::_print_fmt::h724e5f353211a3ca
                               at /rustc/1ab783112ab4e4807304dbd249b39771246013ef/library/std/src/sys_common/backtrace.rs:68:5
   3:     0x7f491dd8b6f6 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h8b1913887ba5f5d5
                               at /rustc/1ab783112ab4e4807304dbd249b39771246013ef/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f491ddddf40 - core::fmt::rt::Argument::fmt::hf0fd130f7eae4c3d
                               at /rustc/1ab783112ab4e4807304dbd249b39771246013ef/library/core/src/fmt/rt.rs:142:9
   5:     0x7f491ddddf40 - core::fmt::write::h7efccb50bbeb8f2d
                               at /rustc/1ab783112ab4e4807304dbd249b39771246013ef/library/core/src/fmt/mod.rs:1120:17
   6:     0x7f491dd7f4af - std::io::Write::write_fmt::h577ca6f5235179c1
                               at /rustc/1ab783112ab4e4807304dbd249b39771246013ef/library/std/src/io/mod.rs:1810:15
   7:     0x7f491dd8b4d4 - std::sys_common::backtrace::_print::hfd3fc853dd8f2062
                               at /rustc/1ab783112ab4e4807304dbd249b39771246013ef/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7f491dd8b4d4 - std::sys_common::backtrace::print::hdd9ab79ba605a33e
                               at /rustc/1ab783112ab4e4807304dbd249b39771246013ef/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7f491dd8e267 - std::panicking::default_hook::{{closure}}::h55227ff383d43da6
  10:     0x7f491dd8dfc9 - std::panicking::default_hook::h222f998032d4fac5
                               at /rustc/1ab783112ab4e4807304dbd249b39771246013ef/library/std/src/panicking.rs:292:9
  11:     0x7f4920b5217c - std[515df92f1d858cd0]::panicking::update_hook::<alloc[f5336dea958e6584]::boxed::Box<rustc_driver_impl[e1d0187348731265]::install_ice_hook::{closure#0}>>::{closure#0}
  12:     0x7f491dd8e9b6 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h44a4b3682f15b897
                               at /rustc/1ab783112ab4e4807304dbd249b39771246013ef/library/alloc/src/boxed.rs:2029:9
  13:     0x7f491dd8e9b6 - std::panicking::rust_panic_with_hook::h5f6eebb2178f45a7
                               at /rustc/1ab783112ab4e4807304dbd249b39771246013ef/library/std/src/panicking.rs:783:13
  14:     0x7f4920b8b284 - std[515df92f1d858cd0]::panicking::begin_panic::<rustc_errors[bfd7491824c3d180]::ExplicitBug>::{closure#0}
  15:     0x7f4920b879c6 - std[515df92f1d858cd0]::sys_common::backtrace::__rust_end_short_backtrace::<std[515df92f1d858cd0]::panicking::begin_panic<rustc_errors[bfd7491824c3d180]::ExplicitBug>::{closure#0}, !>
  16:     0x7f4920b87376 - std[515df92f1d858cd0]::panicking::begin_panic::<rustc_errors[bfd7491824c3d180]::ExplicitBug>
  17:     0x7f4920b962b1 - <rustc_errors[bfd7491824c3d180]::diagnostic_builder::BugAbort as rustc_errors[bfd7491824c3d180]::diagnostic_builder::EmissionGuarantee>::emit_producing_guarantee
  18:     0x7f4920f6a29e - <rustc_errors[bfd7491824c3d180]::DiagCtxt>::bug::<alloc[f5336dea958e6584]::string::String>
  19:     0x7f492100587b - rustc_middle[85a1c30f749671d0]::util::bug::opt_span_bug_fmt::<rustc_span[1ae6d8cb2a21d896]::span_encoding::Span>::{closure#0}
  20:     0x7f4920fef2ba - rustc_middle[85a1c30f749671d0]::ty::context::tls::with_opt::<rustc_middle[85a1c30f749671d0]::util::bug::opt_span_bug_fmt<rustc_span[1ae6d8cb2a21d896]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  21:     0x7f4920fef158 - rustc_middle[85a1c30f749671d0]::ty::context::tls::with_context_opt::<rustc_middle[85a1c30f749671d0]::ty::context::tls::with_opt<rustc_middle[85a1c30f749671d0]::util::bug::opt_span_bug_fmt<rustc_span[1ae6d8cb2a21d896]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  22:     0x7f491ef8d8f0 - rustc_middle[85a1c30f749671d0]::util::bug::bug_fmt
  23:     0x7f492105ced0 - rustc_mir_build[a60f727047e47965]::build::construct_error
  24:     0x7f49220c2c6c - rustc_mir_build[a60f727047e47965]::build::mir_built
  25:     0x7f49220c152d - rustc_query_impl[5e0167d86f023dad]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[5e0167d86f023dad]::query_impl::mir_built::dynamic_query::{closure#2}::{closure#0}, rustc_middle[85a1c30f749671d0]::query::erase::Erased<[u8; 8usize]>>
  26:     0x7f4921ffdf43 - rustc_query_system[c02ec8f8ee4628cc]::query::plumbing::try_execute_query::<rustc_query_impl[5e0167d86f023dad]::DynamicConfig<rustc_query_system[c02ec8f8ee4628cc]::query::caches::VecCache<rustc_span[1ae6d8cb2a21d896]::def_id::LocalDefId, rustc_middle[85a1c30f749671d0]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[5e0167d86f023dad]::plumbing::QueryCtxt, false>
  27:     0x7f4921ffd8d0 - rustc_query_impl[5e0167d86f023dad]::query_impl::mir_built::get_query_non_incr::__rust_end_short_backtrace
  28:     0x7f491f39ea6e - rustc_mir_transform[385e435f7f981c0e]::check_unsafety::unsafety_check_result
  29:     0x7f4921ffdcc7 - rustc_query_impl[5e0167d86f023dad]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[5e0167d86f023dad]::query_impl::unsafety_check_result::dynamic_query::{closure#2}::{closure#0}, rustc_middle[85a1c30f749671d0]::query::erase::Erased<[u8; 8usize]>>
  30:     0x7f4921ffdf43 - rustc_query_system[c02ec8f8ee4628cc]::query::plumbing::try_execute_query::<rustc_query_impl[5e0167d86f023dad]::DynamicConfig<rustc_query_system[c02ec8f8ee4628cc]::query::caches::VecCache<rustc_span[1ae6d8cb2a21d896]::def_id::LocalDefId, rustc_middle[85a1c30f749671d0]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[5e0167d86f023dad]::plumbing::QueryCtxt, false>
  31:     0x7f4921ffda50 - rustc_query_impl[5e0167d86f023dad]::query_impl::unsafety_check_result::get_query_non_incr::__rust_end_short_backtrace
  32:     0x7f4921ffef39 - rustc_mir_transform[385e435f7f981c0e]::mir_const
  33:     0x7f4921ffee67 - rustc_query_impl[5e0167d86f023dad]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[5e0167d86f023dad]::query_impl::mir_const::dynamic_query::{closure#2}::{closure#0}, rustc_middle[85a1c30f749671d0]::query::erase::Erased<[u8; 8usize]>>
  34:     0x7f4921ffdf43 - rustc_query_system[c02ec8f8ee4628cc]::query::plumbing::try_execute_query::<rustc_query_impl[5e0167d86f023dad]::DynamicConfig<rustc_query_system[c02ec8f8ee4628cc]::query::caches::VecCache<rustc_span[1ae6d8cb2a21d896]::def_id::LocalDefId, rustc_middle[85a1c30f749671d0]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[5e0167d86f023dad]::plumbing::QueryCtxt, false>
  35:     0x7f4921ffd990 - rustc_query_impl[5e0167d86f023dad]::query_impl::mir_const::get_query_non_incr::__rust_end_short_backtrace
  36:     0x7f49200f15fc - rustc_mir_transform[385e435f7f981c0e]::mir_promoted
  37:     0x7f49223f4f92 - rustc_query_impl[5e0167d86f023dad]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[5e0167d86f023dad]::query_impl::mir_promoted::dynamic_query::{closure#2}::{closure#0}, rustc_middle[85a1c30f749671d0]::query::erase::Erased<[u8; 16usize]>>
  38:     0x7f49223f525c - rustc_query_system[c02ec8f8ee4628cc]::query::plumbing::try_execute_query::<rustc_query_impl[5e0167d86f023dad]::DynamicConfig<rustc_query_system[c02ec8f8ee4628cc]::query::caches::VecCache<rustc_span[1ae6d8cb2a21d896]::def_id::LocalDefId, rustc_middle[85a1c30f749671d0]::query::erase::Erased<[u8; 16usize]>>, false, false, false>, rustc_query_impl[5e0167d86f023dad]::plumbing::QueryCtxt, false>
  39:     0x7f49223f4e93 - rustc_query_impl[5e0167d86f023dad]::query_impl::mir_promoted::get_query_non_incr::__rust_end_short_backtrace
  40:     0x7f4922d01830 - rustc_borrowck[40a8cab8ead5325]::mir_borrowck
  41:     0x7f4922d01779 - rustc_query_impl[5e0167d86f023dad]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[5e0167d86f023dad]::query_impl::mir_borrowck::dynamic_query::{closure#2}::{closure#0}, rustc_middle[85a1c30f749671d0]::query::erase::Erased<[u8; 8usize]>>
  42:     0x7f4921ffdf43 - rustc_query_system[c02ec8f8ee4628cc]::query::plumbing::try_execute_query::<rustc_query_impl[5e0167d86f023dad]::DynamicConfig<rustc_query_system[c02ec8f8ee4628cc]::query::caches::VecCache<rustc_span[1ae6d8cb2a21d896]::def_id::LocalDefId, rustc_middle[85a1c30f749671d0]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[5e0167d86f023dad]::plumbing::QueryCtxt, false>
  43:     0x7f4921ffdb10 - rustc_query_impl[5e0167d86f023dad]::query_impl::mir_borrowck::get_query_non_incr::__rust_end_short_backtrace
  44:     0x7f4922e173b6 - <rustc_hir_analysis[60cf2858bdf10ca1]::collect::type_of::opaque::RpitConstraintChecker>::check
  45:     0x7f49203f4335 - <rustc_hir_analysis[60cf2858bdf10ca1]::collect::type_of::opaque::RpitConstraintChecker as rustc_hir[5314ce9c510bdad4]::intravisit::Visitor>::visit_expr
  46:     0x7f49203f43f3 - <rustc_hir_analysis[60cf2858bdf10ca1]::collect::type_of::opaque::RpitConstraintChecker as rustc_hir[5314ce9c510bdad4]::intravisit::Visitor>::visit_expr
  47:     0x7f4922de827b - <rustc_hir_analysis[60cf2858bdf10ca1]::collect::type_of::opaque::RpitConstraintChecker as rustc_hir[5314ce9c510bdad4]::intravisit::Visitor>::visit_block
  48:     0x7f4922de7449 - rustc_hir_analysis[60cf2858bdf10ca1]::collect::type_of::type_of_opaque
  49:     0x7f4922de6eb9 - rustc_query_impl[5e0167d86f023dad]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[5e0167d86f023dad]::query_impl::type_of_opaque::dynamic_query::{closure#2}::{closure#0}, rustc_middle[85a1c30f749671d0]::query::erase::Erased<[u8; 8usize]>>
  50:     0x7f4921e88f94 - rustc_query_system[c02ec8f8ee4628cc]::query::plumbing::try_execute_query::<rustc_query_impl[5e0167d86f023dad]::DynamicConfig<rustc_query_system[c02ec8f8ee4628cc]::query::caches::DefaultCache<rustc_span[1ae6d8cb2a21d896]::def_id::DefId, rustc_middle[85a1c30f749671d0]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[5e0167d86f023dad]::plumbing::QueryCtxt, false>
  51:     0x7f4922e448de - rustc_query_impl[5e0167d86f023dad]::query_impl::type_of_opaque::get_query_non_incr::__rust_end_short_backtrace
  52:     0x7f4921f5acbc - rustc_middle[85a1c30f749671d0]::query::plumbing::query_get_at::<rustc_query_system[c02ec8f8ee4628cc]::query::caches::DefaultCache<rustc_span[1ae6d8cb2a21d896]::def_id::DefId, rustc_middle[85a1c30f749671d0]::query::erase::Erased<[u8; 8usize]>>>
  53:     0x7f4920225ac1 - rustc_hir_analysis[60cf2858bdf10ca1]::collect::type_of::type_of
  54:     0x7f4921e8a0fe - rustc_query_impl[5e0167d86f023dad]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[5e0167d86f023dad]::query_impl::type_of::dynamic_query::{closure#2}::{closure#0}, rustc_middle[85a1c30f749671d0]::query::erase::Erased<[u8; 8usize]>>
  55:     0x7f4921e88f94 - rustc_query_system[c02ec8f8ee4628cc]::query::plumbing::try_execute_query::<rustc_query_impl[5e0167d86f023dad]::DynamicConfig<rustc_query_system[c02ec8f8ee4628cc]::query::caches::DefaultCache<rustc_span[1ae6d8cb2a21d896]::def_id::DefId, rustc_middle[85a1c30f749671d0]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[5e0167d86f023dad]::plumbing::QueryCtxt, false>
  56:     0x7f4921e88b5d - rustc_query_impl[5e0167d86f023dad]::query_impl::type_of::get_query_non_incr::__rust_end_short_backtrace
  57:     0x7f4921f5acbc - rustc_middle[85a1c30f749671d0]::query::plumbing::query_get_at::<rustc_query_system[c02ec8f8ee4628cc]::query::caches::DefaultCache<rustc_span[1ae6d8cb2a21d896]::def_id::DefId, rustc_middle[85a1c30f749671d0]::query::erase::Erased<[u8; 8usize]>>>
  58:     0x7f4922aa57be - rustc_hir_analysis[60cf2858bdf10ca1]::check::check::check_item_type
  59:     0x7f4922a9f5cb - rustc_hir_analysis[60cf2858bdf10ca1]::check::check::check_mod_item_types
  60:     0x7f4922a9f56b - rustc_query_impl[5e0167d86f023dad]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[5e0167d86f023dad]::query_impl::check_mod_item_types::dynamic_query::{closure#2}::{closure#0}, rustc_middle[85a1c30f749671d0]::query::erase::Erased<[u8; 0usize]>>
  61:     0x7f4922a0773b - rustc_query_system[c02ec8f8ee4628cc]::query::plumbing::try_execute_query::<rustc_query_impl[5e0167d86f023dad]::DynamicConfig<rustc_query_system[c02ec8f8ee4628cc]::query::caches::DefaultCache<rustc_span[1ae6d8cb2a21d896]::def_id::LocalModDefId, rustc_middle[85a1c30f749671d0]::query::erase::Erased<[u8; 0usize]>>, false, false, false>, rustc_query_impl[5e0167d86f023dad]::plumbing::QueryCtxt, false>
  62:     0x7f4922a07117 - rustc_query_impl[5e0167d86f023dad]::query_impl::check_mod_item_types::get_query_non_incr::__rust_end_short_backtrace
  63:     0x7f4922449c28 - rustc_hir_analysis[60cf2858bdf10ca1]::check_crate
  64:     0x7f4922869fa9 - rustc_interface[590166dac91109dc]::passes::analysis
  65:     0x7f4922869bdd - rustc_query_impl[5e0167d86f023dad]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[5e0167d86f023dad]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[85a1c30f749671d0]::query::erase::Erased<[u8; 1usize]>>
  66:     0x7f4922dc4024 - rustc_query_system[c02ec8f8ee4628cc]::query::plumbing::try_execute_query::<rustc_query_impl[5e0167d86f023dad]::DynamicConfig<rustc_query_system[c02ec8f8ee4628cc]::query::caches::SingleCache<rustc_middle[85a1c30f749671d0]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[5e0167d86f023dad]::plumbing::QueryCtxt, false>
  67:     0x7f4922dc3e15 - rustc_query_impl[5e0167d86f023dad]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  68:     0x7f4922e4b652 - rustc_interface[590166dac91109dc]::interface::run_compiler::<core[40851f48e2bf7378]::result::Result<(), rustc_span[1ae6d8cb2a21d896]::ErrorGuaranteed>, rustc_driver_impl[e1d0187348731265]::run_compiler::{closure#0}>::{closure#0}
  69:     0x7f4922dd3186 - std[515df92f1d858cd0]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[590166dac91109dc]::util::run_in_thread_with_globals<rustc_interface[590166dac91109dc]::util::run_in_thread_pool_with_globals<rustc_interface[590166dac91109dc]::interface::run_compiler<core[40851f48e2bf7378]::result::Result<(), rustc_span[1ae6d8cb2a21d896]::ErrorGuaranteed>, rustc_driver_impl[e1d0187348731265]::run_compiler::{closure#0}>::{closure#0}, core[40851f48e2bf7378]::result::Result<(), rustc_span[1ae6d8cb2a21d896]::ErrorGuaranteed>>::{closure#0}, core[40851f48e2bf7378]::result::Result<(), rustc_span[1ae6d8cb2a21d896]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[40851f48e2bf7378]::result::Result<(), rustc_span[1ae6d8cb2a21d896]::ErrorGuaranteed>>
  70:     0x7f4922dd2fb3 - <<std[515df92f1d858cd0]::thread::Builder>::spawn_unchecked_<rustc_interface[590166dac91109dc]::util::run_in_thread_with_globals<rustc_interface[590166dac91109dc]::util::run_in_thread_pool_with_globals<rustc_interface[590166dac91109dc]::interface::run_compiler<core[40851f48e2bf7378]::result::Result<(), rustc_span[1ae6d8cb2a21d896]::ErrorGuaranteed>, rustc_driver_impl[e1d0187348731265]::run_compiler::{closure#0}>::{closure#0}, core[40851f48e2bf7378]::result::Result<(), rustc_span[1ae6d8cb2a21d896]::ErrorGuaranteed>>::{closure#0}, core[40851f48e2bf7378]::result::Result<(), rustc_span[1ae6d8cb2a21d896]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[40851f48e2bf7378]::result::Result<(), rustc_span[1ae6d8cb2a21d896]::ErrorGuaranteed>>::{closure#1} as core[40851f48e2bf7378]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  71:     0x7f491dd988e5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h48c7d1fd92d8d424
                               at /rustc/1ab783112ab4e4807304dbd249b39771246013ef/library/alloc/src/boxed.rs:2015:9
  72:     0x7f491dd988e5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h03f9c0e83ae2d107
                               at /rustc/1ab783112ab4e4807304dbd249b39771246013ef/library/alloc/src/boxed.rs:2015:9
  73:     0x7f491dd988e5 - std::sys::unix::thread::Thread::new::thread_start::ha200406fab7d0f9d
                               at /rustc/1ab783112ab4e4807304dbd249b39771246013ef/library/std/src/sys/unix/thread.rs:108:17
  74:     0x7f491db849eb - <unknown>
  75:     0x7f491dc087cc - <unknown>
  76:                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 1.77.0-nightly (1ab783112 2023-12-26) 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 `foo::{closure#0}::{constant#0}::{closure#0}`
#1 [unsafety_check_result] unsafety-checking `foo::{closure#0}::{constant#0}::{closure#0}`
#2 [mir_const] preparing `foo::{closure#0}::{constant#0}::{closure#0}` for borrow checking
#3 [mir_promoted] promoting constants in MIR for `foo::{closure#0}::{constant#0}::{closure#0}`
#4 [mir_borrowck] borrow-checking `foo::{closure#0}::{constant#0}::{closure#0}`
#5 [type_of_opaque] computing type of opaque `foo::{opaque#0}`
#6 [type_of] computing type of `foo::{opaque#0}`
#7 [check_mod_item_types] checking item types in top-level module
#8 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 3 previous errors; 1 warning emitted

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

[matthiaskrgr]

Regression in nightly-2022-12-09

found 3 bors merge commits in the specified range
commit[0] 2022-12-07: Auto merge of #103459 - ChrisDenton:propagate-nulls, r=thomcc
commit[1] 2022-12-08: Auto merge of #105425 - matthiaskrgr:rollup-3ngvxmt, r=matthiaskrgr
commit[2] 2022-12-08: Auto merge of #105415 - nikic:update-llvm-10, r=cuviper
ERROR: no CI builds available between 01fbc5a and 7632db0 within last 167 days

maybe #105400 ?