rust-lang / rust-lang/rust

[ICE]: `TypeTestError`

Open
#159,100 2 comments 0 reactions 1 assignee View on GitHub

Nobody has claimed this yet.

C-bug F-generic_const_exprs I-ICE needs-triage T-compiler
Dominant language
Rust
Stars
119k
Forks
16.1k
PR metrics pending

Description

code:

#![feature(generic_const_exprs)]
fn main() {
  async { std::any::TypeId::of::<[u8; 1 << 3]> };
}

Version information

rustc 1.99.0-nightly (31e4b8481 2026-07-10)
binary: rustc
commit-hash: 31e4b8481fec5ae856d786ff3b75a5bccaf33725
commit-date: 2026-07-10
host: x86_64-unknown-linux-gnu
release: 1.99.0-nightly
LLVM version: 22.1.8

Possibly related line of code:
https://github.com/rust-lang/rust/blob/31e4b8481fec5ae856d786ff3b75a5bccaf33725/compiler/rustc_middle/src/ty/generics.rs#L232-L244

Command:
/home/matthias/.rustup/toolchains/master/bin/rustc --edition=2024

Program output 

warning: the feature `generic_const_exprs` is incomplete and may not be safe to use and/or cause compiler crashes
 --> /tmp/icemaker_global_tempdir.f5RIUbTmu08i/rustc_testrunner_tmpdir_reporting.g3afaUZLiLp9/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


thread 'rustc' (2797206) panicked at /rustc-dev/31e4b8481fec5ae856d786ff3b75a5bccaf33725/compiler/rustc_middle/src/ty/generics.rs:238:29:
index out of bounds: the len is 0 but the index is 0
stack backtrace:
   0:     0x7f8e897e3896 - <<std[e48f09884f45ea21]::sys::backtrace::BacktraceLock>::print::DisplayBacktrace as core[e5be8543f67d0d91]::fmt::Display>::fmt
   1:     0x7f8e89e0f048 - core[e5be8543f67d0d91]::fmt::write
   2:     0x7f8e897f8d0c - <std[e48f09884f45ea21]::sys::stdio::unix::Stderr as core[e5be8543f67d0d91]::io::write::Write>::write_fmt
   3:     0x7f8e897b7b7a - std[e48f09884f45ea21]::panicking::default_hook::{closure#0}
   4:     0x7f8e897d5f63 - std[e48f09884f45ea21]::panicking::default_hook
   5:     0x7f8e887ae0c8 - std[e48f09884f45ea21]::panicking::update_hook::<alloc[4dba938b21960414]::boxed::Box<rustc_driver_impl[534fa358d39ad0eb]::install_ice_hook::{closure#1}>>::{closure#0}
   6:     0x7f8e897d6402 - std[e48f09884f45ea21]::panicking::panic_with_hook
   7:     0x7f8e897b7c32 - std[e48f09884f45ea21]::panicking::panic_handler::{closure#0}
   8:     0x7f8e897ae8e9 - std[e48f09884f45ea21]::sys::backtrace::__rust_end_short_backtrace::<std[e48f09884f45ea21]::panicking::panic_handler::{closure#0}, !>
   9:     0x7f8e897b959d - __rustc[f7e22f5d7ccfbcc1]::rust_begin_unwind
  10:     0x7f8e8657262c - core[e5be8543f67d0d91]::panicking::panic_fmt
  11:     0x7f8e86663ea9 - core[e5be8543f67d0d91]::panicking::panic_bounds_check
  12:     0x7f8e8b8dd2e8 - <rustc_middle[7c2a401f29a14518]::ty::generics::Generics>::param_at.cold
  13:     0x7f8e86c1536e - <rustc_middle[7c2a401f29a14518]::ty::generics::Generics>::type_param
  14:     0x7f8e895eee25 - <rustc_trait_selection[7d06e2a7f7adad07]::error_reporting::TypeErrCtxt>::construct_generic_bound_failure
  15:     0x7f8e884d8cd3 - <rustc_borrowck[ec84113c7fc7943e]::MirBorrowckCtxt>::report_region_errors
  16:     0x7f8e8668bdf3 - rustc_borrowck[ec84113c7fc7943e]::borrowck_check_region_constraints
  17:     0x7f8e8ab87725 - <rustc_borrowck[ec84113c7fc7943e]::root_cx::BorrowCheckRootCtxt>::do_mir_borrowck
  18:     0x7f8e8aba7999 - rustc_borrowck[ec84113c7fc7943e]::mir_borrowck
  19:     0x7f8e8aba7765 - rustc_query_impl[3955d32c7988f865]::query_impl::mir_borrowck::invoke_provider_fn::__rust_begin_short_backtrace
  20:     0x7f8e8a2ba3ad - rustc_query_impl[3955d32c7988f865]::execution::try_execute_query::<rustc_data_structures[a12274fc7e50345]::vec_cache::VecCache<rustc_span[9cc8f1799c8a1528]::def_id::LocalDefId, rustc_middle[7c2a401f29a14518]::query::erase::ErasedData<[u8; 8usize]>, rustc_middle[7c2a401f29a14518]::dep_graph::graph::DepNodeIndex>, true>
  21:     0x7f8e8a049ab9 - rustc_query_impl[3955d32c7988f865]::query_impl::mir_borrowck::execute_query_incr::__rust_end_short_backtrace
  22:     0x7f8e8a3b1faa - rustc_mir_transform[bc4c6e33760a47cf]::mir_drops_elaborated_and_const_checked
  23:     0x7f8e8a3b1519 - rustc_query_impl[3955d32c7988f865]::query_impl::mir_drops_elaborated_and_const_checked::invoke_provider_fn::__rust_begin_short_backtrace
  24:     0x7f8e8a2ba3ad - rustc_query_impl[3955d32c7988f865]::execution::try_execute_query::<rustc_data_structures[a12274fc7e50345]::vec_cache::VecCache<rustc_span[9cc8f1799c8a1528]::def_id::LocalDefId, rustc_middle[7c2a401f29a14518]::query::erase::ErasedData<[u8; 8usize]>, rustc_middle[7c2a401f29a14518]::dep_graph::graph::DepNodeIndex>, true>
  25:     0x7f8e8a04a163 - rustc_query_impl[3955d32c7988f865]::query_impl::mir_drops_elaborated_and_const_checked::execute_query_incr::__rust_end_short_backtrace
  26:     0x7f8e8a3aecb2 - <rustc_middle[7c2a401f29a14518]::ty::context::TyCtxt>::par_hir_body_owners::<rustc_interface[4829d49cec04e530]::passes::run_required_analyses::{closure#2}::{closure#0}>::{closure#0}
  27:     0x7f8e88c03f84 - <rustc_thread_pool[a19634b09225b201]::job::HeapJob<<rustc_thread_pool[a19634b09225b201]::scope::Scope>::spawn<rustc_data_structures[a12274fc7e50345]::sync::parallel::par_slice<&rustc_span[9cc8f1799c8a1528]::def_id::LocalDefId, rustc_data_structures[a12274fc7e50345]::sync::parallel::par_for_each_in<&rustc_span[9cc8f1799c8a1528]::def_id::LocalDefId, &[rustc_span[9cc8f1799c8a1528]::def_id::LocalDefId], <rustc_middle[7c2a401f29a14518]::ty::context::TyCtxt>::par_hir_body_owners<rustc_interface[4829d49cec04e530]::passes::run_required_analyses::{closure#2}::{closure#0}>::{closure#0}>::{closure#0}::{closure#0}>::{closure#1}::{closure#0}>::{closure#0}> as rustc_thread_pool[a19634b09225b201]::job::Job>::execute
  28:     0x7f8e894d398f - <rustc_thread_pool[a19634b09225b201]::registry::WorkerThread>::wait_or_steal_until_cold
  29:     0x7f8e894d2402 - <rustc_thread_pool[a19634b09225b201]::registry::ThreadBuilder>::run
  30:     0x7f8e887a66fc - std[e48f09884f45ea21]::sys::backtrace::__rust_begin_short_backtrace::<<rustc_thread_pool[a19634b09225b201]::ThreadPoolBuilder>::build_scoped<rustc_interface[4829d49cec04e530]::util::run_in_thread_pool_with_globals<rustc_interface[4829d49cec04e530]::interface::run_compiler<(), rustc_driver_impl[534fa358d39ad0eb]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#5}::{closure#0}::{closure#0}, rustc_interface[4829d49cec04e530]::util::run_in_thread_pool_with_globals<rustc_interface[4829d49cec04e530]::interface::run_compiler<(), rustc_driver_impl[534fa358d39ad0eb]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#5}::{closure#0}::{closure#1}, ()>::{closure#0}::{closure#0}::{closure#0}, ()>
  31:     0x7f8e887b008a - <std[e48f09884f45ea21]::thread::lifecycle::spawn_unchecked<<rustc_thread_pool[a19634b09225b201]::ThreadPoolBuilder>::build_scoped<rustc_interface[4829d49cec04e530]::util::run_in_thread_pool_with_globals<rustc_interface[4829d49cec04e530]::interface::run_compiler<(), rustc_driver_impl[534fa358d39ad0eb]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#5}::{closure#0}::{closure#0}, rustc_interface[4829d49cec04e530]::util::run_in_thread_pool_with_globals<rustc_interface[4829d49cec04e530]::interface::run_compiler<(), rustc_driver_impl[534fa358d39ad0eb]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#5}::{closure#0}::{closure#1}, ()>::{closure#0}::{closure#0}::{closure#0}, ()>::{closure#1} as core[e5be8543f67d0d91]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  32:     0x7f8e8afde07a - <std[e48f09884f45ea21]::sys::thread::unix::Thread>::new::thread_start
  33:     0x7f8e848981b9 - <unknown>
  34:     0x7f8e8491d21c - <unknown>
  35:                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: please make sure that you have updated to the latest nightly

note: rustc 1.99.0-nightly (31e4b8481 2026-07-10) running on x86_64-unknown-linux-gnu

note: compiler flags: -Z incremental-verify-ich=yes -C incremental=[REDACTED] -C debuginfo=2 -C link-dead-code=true -Z validate-mir -Z query-dep-graph -Z threads=4

query stack during panic:
#0 [mir_borrowck] borrow-checking `main`
#1 [mir_drops_elaborated_and_const_checked] elaborating drops for `main::{closure#0}`
#2 [analysis] running analysis passes on crate `mvce`
end of query stack
warning: 1 warning emitted

note: no errors encountered even though delayed bugs were created

note: those delayed bugs will now be shown as internal compiler errors

error: internal compiler error: TypeTestError { type_test: TypeTest from /tmp/icemaker_global_tempdir.f5RIUbTmu08i/rustc_testrunner_tmpdir_reporting.g3afaUZLiLp9/mvce.rs:3:13: 3:49 (#0)['?1: '?0] ⊢ /#0: '?0 }
  |
  = note: delayed at /rustc-dev/31e4b8481fec5ae856d786ff3b75a5bccaf33725/compiler/rustc_borrowck/src/region_infer/mod.rs:633:31
             0: <rustc_errors::DiagCtxtInner>::emit_diagnostic
             1: <rustc_errors::DiagCtxtHandle>::emit_diagnostic
             2: <rustc_span::ErrorGuaranteed as rustc_errors::diagnostic::EmissionGuarantee>::emit_producing_guarantee
             3: <rustc_errors::DiagCtxtHandle>::delayed_bug::<alloc::string::String>
             4: <rustc_borrowck::diagnostics::region_errors::RegionErrors>::push::<rustc_borrowck::diagnostics::region_errors::RegionErrorKind>
             5: <rustc_borrowck::region_infer::RegionInferenceContext>::solve
             6: rustc_borrowck::borrowck_check_region_constraints
             7: <rustc_borrowck::root_cx::BorrowCheckRootCtxt>::do_mir_borrowck
             8: rustc_borrowck::mir_borrowck
             9: rustc_query_impl::query_impl::mir_borrowck::invoke_provider_fn::__rust_begin_short_backtrace
            10: rustc_query_impl::execution::try_execute_query::<rustc_data_structures::vec_cache::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::ErasedData<[u8; 8]>, rustc_middle::dep_graph::graph::DepNodeIndex>, true>
            11: rustc_query_impl::query_impl::mir_borrowck::execute_query_incr::__rust_end_short_backtrace
            12: rustc_mir_transform::mir_drops_elaborated_and_const_checked
            13: rustc_query_impl::query_impl::mir_drops_elaborated_and_const_checked::invoke_provider_fn::__rust_begin_short_backtrace
            14: rustc_query_impl::execution::try_execute_query::<rustc_data_structures::vec_cache::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::ErasedData<[u8; 8]>, rustc_middle::dep_graph::graph::DepNodeIndex>, true>
            15: rustc_query_impl::query_impl::mir_drops_elaborated_and_const_checked::execute_query_incr::__rust_end_short_backtrace
            16: <rustc_middle::ty::context::TyCtxt>::par_hir_body_owners::<rustc_interface::passes::run_required_analyses::{closure#2}::{closure#0}>::{closure#0}
            17: <rustc_thread_pool::job::HeapJob<<rustc_thread_pool::scope::Scope>::spawn<rustc_data_structures::sync::parallel::par_slice<&rustc_span::def_id::LocalDefId, rustc_data_structures::sync::parallel::par_for_each_in<&rustc_span::def_id::LocalDefId, &[rustc_span::def_id::LocalDefId], <rustc_middle::ty::context::TyCtxt>::par_hir_body_owners<rustc_interface::passes::run_required_analyses::{closure#2}::{closure#0}>::{closure#0}>::{closure#0}::{closure#0}>::{closure#1}::{closure#0}>::{closure#0}> as rustc_thread_pool::job::Job>::execute
            18: <rustc_thread_pool::registry::WorkerThread>::wait_or_steal_until_cold
            19: <rustc_thread_pool::registry::ThreadBuilder>::run
            20: std::sys::backtrace::__rust_begin_short_backtrace::<<rustc_thread_pool::ThreadPoolBuilder>::build_scoped<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#5}::{closure#0}::{closure#0}, rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#5}::{closure#0}::{closure#1}, ()>::{closure#0}::{closure#0}::{closure#0}, ()>
            21: <std::thread::lifecycle::spawn_unchecked<<rustc_thread_pool::ThreadPoolBuilder>::build_scoped<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#5}::{closure#0}::{closure#0}, rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#5}::{closure#0}::{closure#1}, ()>::{closure#0}::{closure#0}::{closure#0}, ()>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
            22: <std::sys::thread::unix::Thread>::new::thread_start
            23: <unknown>
            24: <unknown>
          

error: internal compiler error: TypeTestError { type_test: TypeTest from /tmp/icemaker_global_tempdir.f5RIUbTmu08i/rustc_testrunner_tmpdir_reporting.g3afaUZLiLp9/mvce.rs:3:13: 3:49 (#0)['?1: '?0] ⊢ /#1: '?0 }
  |
  = note: delayed at /rustc-dev/31e4b8481fec5ae856d786ff3b75a5bccaf33725/compiler/rustc_borrowck/src/region_infer/mod.rs:633:31
             0: <rustc_errors::DiagCtxtInner>::emit_diagnostic
             1: <rustc_errors::DiagCtxtHandle>::emit_diagnostic
             2: <rustc_span::ErrorGuaranteed as rustc_errors::diagnostic::EmissionGuarantee>::emit_producing_guarantee
             3: <rustc_errors::DiagCtxtHandle>::delayed_bug::<alloc::string::String>
             4: <rustc_borrowck::diagnostics::region_errors::RegionErrors>::push::<rustc_borrowck::diagnostics::region_errors::RegionErrorKind>
             5: <rustc_borrowck::region_infer::RegionInferenceContext>::solve
             6: rustc_borrowck::borrowck_check_region_constraints
             7: <rustc_borrowck::root_cx::BorrowCheckRootCtxt>::do_mir_borrowck
             8: rustc_borrowck::mir_borrowck
             9: rustc_query_impl::query_impl::mir_borrowck::invoke_provider_fn::__rust_begin_short_backtrace
            10: rustc_query_impl::execution::try_execute_query::<rustc_data_structures::vec_cache::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::ErasedData<[u8; 8]>, rustc_middle::dep_graph::graph::DepNodeIndex>, true>
            11: rustc_query_impl::query_impl::mir_borrowck::execute_query_incr::__rust_end_short_backtrace
            12: rustc_mir_transform::mir_drops_elaborated_and_const_checked
            13: rustc_query_impl::query_impl::mir_drops_elaborated_and_const_checked::invoke_provider_fn::__rust_begin_short_backtrace
            14: rustc_query_impl::execution::try_execute_query::<rustc_data_structures::vec_cache::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::ErasedData<[u8; 8]>, rustc_middle::dep_graph::graph::DepNodeIndex>, true>
            15: rustc_query_impl::query_impl::mir_drops_elaborated_and_const_checked::execute_query_incr::__rust_end_short_backtrace
            16: <rustc_middle::ty::context::TyCtxt>::par_hir_body_owners::<rustc_interface::passes::run_required_analyses::{closure#2}::{closure#0}>::{closure#0}
            17: <rustc_thread_pool::job::HeapJob<<rustc_thread_pool::scope::Scope>::spawn<rustc_data_structures::sync::parallel::par_slice<&rustc_span::def_id::LocalDefId, rustc_data_structures::sync::parallel::par_for_each_in<&rustc_span::def_id::LocalDefId, &[rustc_span::def_id::LocalDefId], <rustc_middle::ty::context::TyCtxt>::par_hir_body_owners<rustc_interface::passes::run_required_analyses::{closure#2}::{closure#0}>::{closure#0}>::{closure#0}::{closure#0}>::{closure#1}::{closure#0}>::{closure#0}> as rustc_thread_pool::job::Job>::execute
            18: <rustc_thread_pool::registry::WorkerThread>::wait_or_steal_until_cold
            19: <rustc_thread_pool::registry::ThreadBuilder>::run
            20: std::sys::backtrace::__rust_begin_short_backtrace::<<rustc_thread_pool::ThreadPoolBuilder>::build_scoped<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#5}::{closure#0}::{closure#0}, rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#5}::{closure#0}::{closure#1}, ()>::{closure#0}::{closure#0}::{closure#0}, ()>
            21: <std::thread::lifecycle::spawn_unchecked<<rustc_thread_pool::ThreadPoolBuilder>::build_scoped<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#5}::{closure#0}::{closure#0}, rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#5}::{closure#0}::{closure#1}, ()>::{closure#0}::{closure#0}::{closure#0}, ()>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
            22: <std::sys::thread::unix::Thread>::new::thread_start
            23: <unknown>
            24: <unknown>
          

error: internal compiler error: TypeTestError { type_test: TypeTest from /tmp/icemaker_global_tempdir.f5RIUbTmu08i/rustc_testrunner_tmpdir_reporting.g3afaUZLiLp9/mvce.rs:3:13: 3:49 (#0)['?1: '?0] ⊢ /#2: '?0 }
  |
  = note: delayed at /rustc-dev/31e4b8481fec5ae856d786ff3b75a5bccaf33725/compiler/rustc_borrowck/src/region_infer/mod.rs:633:31
             0: <rustc_errors::DiagCtxtInner>::emit_diagnostic
             1: <rustc_errors::DiagCtxtHandle>::emit_diagnostic
             2: <rustc_span::ErrorGuaranteed as rustc_errors::diagnostic::EmissionGuarantee>::emit_producing_guarantee
             3: <rustc_errors::DiagCtxtHandle>::delayed_bug::<alloc::string::String>
             4: <rustc_borrowck::diagnostics::region_errors::RegionErrors>::push::<rustc_borrowck::diagnostics::region_errors::RegionErrorKind>
             5: <rustc_borrowck::region_infer::RegionInferenceContext>::solve
             6: rustc_borrowck::borrowck_check_region_constraints
             7: <rustc_borrowck::root_cx::BorrowCheckRootCtxt>::do_mir_borrowck
             8: rustc_borrowck::mir_borrowck
             9: rustc_query_impl::query_impl::mir_borrowck::invoke_provider_fn::__rust_begin_short_backtrace
            10: rustc_query_impl::execution::try_execute_query::<rustc_data_structures::vec_cache::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::ErasedData<[u8; 8]>, rustc_middle::dep_graph::graph::DepNodeIndex>, true>
            11: rustc_query_impl::query_impl::mir_borrowck::execute_query_incr::__rust_end_short_backtrace
            12: rustc_mir_transform::mir_drops_elaborated_and_const_checked
            13: rustc_query_impl::query_impl::mir_drops_elaborated_and_const_checked::invoke_provider_fn::__rust_begin_short_backtrace
            14: rustc_query_impl::execution::try_execute_query::<rustc_data_structures::vec_cache::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::ErasedData<[u8; 8]>, rustc_middle::dep_graph::graph::DepNodeIndex>, true>
            15: rustc_query_impl::query_impl::mir_drops_elaborated_and_const_checked::execute_query_incr::__rust_end_short_backtrace
            16: <rustc_middle::ty::context::TyCtxt>::par_hir_body_owners::<rustc_interface::passes::run_required_analyses::{closure#2}::{closure#0}>::{closure#0}
            17: <rustc_thread_pool::job::HeapJob<<rustc_thread_pool::scope::Scope>::spawn<rustc_data_structures::sync::parallel::par_slice<&rustc_span::def_id::LocalDefId, rustc_data_structures::sync::parallel::par_for_each_in<&rustc_span::def_id::LocalDefId, &[rustc_span::def_id::LocalDefId], <rustc_middle::ty::context::TyCtxt>::par_hir_body_owners<rustc_interface::passes::run_required_analyses::{closure#2}::{closure#0}>::{closure#0}>::{closure#0}::{closure#0}>::{closure#1}::{closure#0}>::{closure#0}> as rustc_thread_pool::job::Job>::execute
            18: <rustc_thread_pool::registry::WorkerThread>::wait_or_steal_until_cold
            19: <rustc_thread_pool::registry::ThreadBuilder>::run
            20: std::sys::backtrace::__rust_begin_short_backtrace::<<rustc_thread_pool::ThreadPoolBuilder>::build_scoped<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#5}::{closure#0}::{closure#0}, rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#5}::{closure#0}::{closure#1}, ()>::{closure#0}::{closure#0}::{closure#0}, ()>
            21: <std::thread::lifecycle::spawn_unchecked<<rustc_thread_pool::ThreadPoolBuilder>::build_scoped<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#5}::{closure#0}::{closure#0}, rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#5}::{closure#0}::{closure#1}, ()>::{closure#0}::{closure#0}::{closure#0}, ()>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
            22: <std::sys::thread::unix::Thread>::new::thread_start
            23: <unknown>
            24: <unknown>
          

error: internal compiler error: TypeTestError { type_test: TypeTest from /tmp/icemaker_global_tempdir.f5RIUbTmu08i/rustc_testrunner_tmpdir_reporting.g3afaUZLiLp9/mvce.rs:3:13: 3:49 (#0)['?1: '?0] ⊢ /#3: '?0 }
  |
  = note: delayed at /rustc-dev/31e4b8481fec5ae856d786ff3b75a5bccaf33725/compiler/rustc_borrowck/src/region_infer/mod.rs:633:31
             0: <rustc_errors::DiagCtxtInner>::emit_diagnostic
             1: <rustc_errors::DiagCtxtHandle>::emit_diagnostic
             2: <rustc_span::ErrorGuaranteed as rustc_errors::diagnostic::EmissionGuarantee>::emit_producing_guarantee
             3: <rustc_errors::DiagCtxtHandle>::delayed_bug::<alloc::string::String>
             4: <rustc_borrowck::diagnostics::region_errors::RegionErrors>::push::<rustc_borrowck::diagnostics::region_errors::RegionErrorKind>
             5: <rustc_borrowck::region_infer::RegionInferenceContext>::solve
             6: rustc_borrowck::borrowck_check_region_constraints
             7: <rustc_borrowck::root_cx::BorrowCheckRootCtxt>::do_mir_borrowck
             8: rustc_borrowck::mir_borrowck
             9: rustc_query_impl::query_impl::mir_borrowck::invoke_provider_fn::__rust_begin_short_backtrace
            10: rustc_query_impl::execution::try_execute_query::<rustc_data_structures::vec_cache::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::ErasedData<[u8; 8]>, rustc_middle::dep_graph::graph::DepNodeIndex>, true>
            11: rustc_query_impl::query_impl::mir_borrowck::execute_query_incr::__rust_end_short_backtrace
            12: rustc_mir_transform::mir_drops_elaborated_and_const_checked
            13: rustc_query_impl::query_impl::mir_drops_elaborated_and_const_checked::invoke_provider_fn::__rust_begin_short_backtrace
            14: rustc_query_impl::execution::try_execute_query::<rustc_data_structures::vec_cache::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::ErasedData<[u8; 8]>, rustc_middle::dep_graph::graph::DepNodeIndex>, true>
            15: rustc_query_impl::query_impl::mir_drops_elaborated_and_const_checked::execute_query_incr::__rust_end_short_backtrace
            16: <rustc_middle::ty::context::TyCtxt>::par_hir_body_owners::<rustc_interface::passes::run_required_analyses::{closure#2}::{closure#0}>::{closure#0}
            17: <rustc_thread_pool::job::HeapJob<<rustc_thread_pool::scope::Scope>::spawn<rustc_data_structures::sync::parallel::par_slice<&rustc_span::def_id::LocalDefId, rustc_data_structures::sync::parallel::par_for_each_in<&rustc_span::def_id::LocalDefId, &[rustc_span::def_id::LocalDefId], <rustc_middle::ty::context::TyCtxt>::par_hir_body_owners<rustc_interface::passes::run_required_analyses::{closure#2}::{closure#0}>::{closure#0}>::{closure#0}::{closure#0}>::{closure#1}::{closure#0}>::{closure#0}> as rustc_thread_pool::job::Job>::execute
            18: <rustc_thread_pool::registry::WorkerThread>::wait_or_steal_until_cold
            19: <rustc_thread_pool::registry::ThreadBuilder>::run
            20: std::sys::backtrace::__rust_begin_short_backtrace::<<rustc_thread_pool::ThreadPoolBuilder>::build_scoped<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#5}::{closure#0}::{closure#0}, rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#5}::{closure#0}::{closure#1}, ()>::{closure#0}::{closure#0}::{closure#0}, ()>
            21: <std::thread::lifecycle::spawn_unchecked<<rustc_thread_pool::ThreadPoolBuilder>::build_scoped<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#5}::{closure#0}::{closure#0}, rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#5}::{closure#0}::{closure#1}, ()>::{closure#0}::{closure#0}::{closure#0}, ()>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
            22: <std::sys::thread::unix::Thread>::new::thread_start
            23: <unknown>
            24: <unknown>
          

error: internal compiler error: TypeTestError { type_test: TypeTest from /tmp/icemaker_global_tempdir.f5RIUbTmu08i/rustc_testrunner_tmpdir_reporting.g3afaUZLiLp9/mvce.rs:3:13: 3:49 (#0)['?1: '?0] ⊢ /#4: '?0 }
  |
  = note: delayed at /rustc-dev/31e4b8481fec5ae856d786ff3b75a5bccaf33725/compiler/rustc_borrowck/src/region_infer/mod.rs:633:31
             0: <rustc_errors::DiagCtxtInner>::emit_diagnostic
             1: <rustc_errors::DiagCtxtHandle>::emit_diagnostic
             2: <rustc_span::ErrorGuaranteed as rustc_errors::diagnostic::EmissionGuarantee>::emit_producing_guarantee
             3: <rustc_errors::DiagCtxtHandle>::delayed_bug::<alloc::string::String>
             4: <rustc_borrowck::diagnostics::region_errors::RegionErrors>::push::<rustc_borrowck::diagnostics::region_errors::RegionErrorKind>
             5: <rustc_borrowck::region_infer::RegionInferenceContext>::solve
             6: rustc_borrowck::borrowck_check_region_constraints
             7: <rustc_borrowck::root_cx::BorrowCheckRootCtxt>::do_mir_borrowck
             8: rustc_borrowck::mir_borrowck
             9: rustc_query_impl::query_impl::mir_borrowck::invoke_provider_fn::__rust_begin_short_backtrace
            10: rustc_query_impl::execution::try_execute_query::<rustc_data_structures::vec_cache::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::ErasedData<[u8; 8]>, rustc_middle::dep_graph::graph::DepNodeIndex>, true>
            11: rustc_query_impl::query_impl::mir_borrowck::execute_query_incr::__rust_end_short_backtrace
            12: rustc_mir_transform::mir_drops_elaborated_and_const_checked
            13: rustc_query_impl::query_impl::mir_drops_elaborated_and_const_checked::invoke_provider_fn::__rust_begin_short_backtrace
            14: rustc_query_impl::execution::try_execute_query::<rustc_data_structures::vec_cache::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::ErasedData<[u8; 8]>, rustc_middle::dep_graph::graph::DepNodeIndex>, true>
            15: rustc_query_impl::query_impl::mir_drops_elaborated_and_const_checked::execute_query_incr::__rust_end_short_backtrace
            16: <rustc_middle::ty::context::TyCtxt>::par_hir_body_owners::<rustc_interface::passes::run_required_analyses::{closure#2}::{closure#0}>::{closure#0}
            17: <rustc_thread_pool::job::HeapJob<<rustc_thread_pool::scope::Scope>::spawn<rustc_data_structures::sync::parallel::par_slice<&rustc_span::def_id::LocalDefId, rustc_data_structures::sync::parallel::par_for_each_in<&rustc_span::def_id::LocalDefId, &[rustc_span::def_id::LocalDefId], <rustc_middle::ty::context::TyCtxt>::par_hir_body_owners<rustc_interface::passes::run_required_analyses::{closure#2}::{closure#0}>::{closure#0}>::{closure#0}::{closure#0}>::{closure#1}::{closure#0}>::{closure#0}> as rustc_thread_pool::job::Job>::execute
            18: <rustc_thread_pool::registry::WorkerThread>::wait_or_steal_until_cold
            19: <rustc_thread_pool::registry::ThreadBuilder>::run
            20: std::sys::backtrace::__rust_begin_short_backtrace::<<rustc_thread_pool::ThreadPoolBuilder>::build_scoped<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#5}::{closure#0}::{closure#0}, rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#5}::{closure#0}::{closure#1}, ()>::{closure#0}::{closure#0}::{closure#0}, ()>
            21: <std::thread::lifecycle::spawn_unchecked<<rustc_thread_pool::ThreadPoolBuilder>::build_scoped<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#5}::{closure#0}::{closure#0}, rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#5}::{closure#0}::{closure#1}, ()>::{closure#0}::{closure#0}::{closure#0}, ()>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
            22: <std::sys::thread::unix::Thread>::new::thread_start
            23: <unknown>
            24: <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 1.99.0-nightly (31e4b8481 2026-07-10) running on x86_64-unknown-linux-gnu

note: compiler flags: -Z incremental-verify-ich=yes -C incremental=[REDACTED] -C debuginfo=2 -C link-dead-code=true -Z validate-mir -Z query-dep-graph -Z threads=4

query stack during panic:
end of query stack

@rustbot label +F-generic_const_exprs

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Assessment

This issue has not been assessed yet.

Get new issues in your inbox

A short digest of beginner-friendly GitHub issues.