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ICE: fake borrows are always indirect #136298

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matthiaskrgr opened this issue Jan 30, 2025 · 3 comments · May be fixed by #136325
Open

ICE: fake borrows are always indirect #136298

matthiaskrgr opened this issue Jan 30, 2025 · 3 comments · May be fixed by #136325
Labels
C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ needs-triage This issue may need triage. Remove it if it has been sufficiently triaged. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.

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@matthiaskrgr
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auto-reduced (treereduce-rust):

const ARR: [u16] = [42, 43, 44, 500, 46, 47];

const BONG: [i32; (ARR[0] - 41) as usize] = [5];

original:

const ARR: [u16] = [42, 43, 44, 500, 46, 47];
const IDX: usize = 3;
const VAL: i32 = ARR[IDX];
const BONG: [i32; (ARR[0] - 41) as usize] = [5];
const BLUB: [i32; (ARR[0] - 40) as usize] = [5];
//~^ ERROR: mismatched types
//~| expected an array
const BOO: [i32; (ARR[0] - 41) as u8] = [5, 99];
//~^ ERROR: mismatched types
//~| expected an array

fn main() {
    let _ = VAL;
}

Version information

rustc 1.86.0-nightly (e6f12c8b7 2025-01-30)
binary: rustc
commit-hash: e6f12c8b7d8d5c821c32fb2739ea01d1d874c58a
commit-date: 2025-01-30
host: x86_64-unknown-linux-gnu
release: 1.86.0-nightly
LLVM version: 19.1.7

Possibly related line of code:

rust/compiler/rustc_const_eval/src/check_consts/check.rs

Lines 631 to 643 in e6f12c8

}
}
Rvalue::RawPtr(RawPtrKind::FakeForPtrMetadata, place) => {
// These are only inserted for slice length, so the place must already be indirect.
// This implies we do not have to worry about whether the borrow escapes.
assert!(place.is_indirect(), "fake borrows are always indirect");
}
Rvalue::Cast(
CastKind::PointerCoercion(
PointerCoercion::MutToConstPointer
| PointerCoercion::ArrayToPointer

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

Program output 

error[E0601]: `main` function not found in crate `mvce`
 --> /tmp/icemaker_global_tempdir.45pNVAwEMplG/rustc_testrunner_tmpdir_reporting.ZlwAFcmDkhGl/mvce.rs:3:49
  |
3 | const BONG: [i32; (ARR[0] - 41) as usize] = [5];
  |                                                 ^ consider adding a `main` function to `/tmp/icemaker_global_tempdir.45pNVAwEMplG/rustc_testrunner_tmpdir_reporting.ZlwAFcmDkhGl/mvce.rs`

error[E0277]: the size for values of type `[u16]` cannot be known at compilation time
 --> /tmp/icemaker_global_tempdir.45pNVAwEMplG/rustc_testrunner_tmpdir_reporting.ZlwAFcmDkhGl/mvce.rs:1:12
  |
1 | const ARR: [u16] = [42, 43, 44, 500, 46, 47];
  |            ^^^^^ doesn't have a size known at compile-time
  |
  = help: the trait `Sized` is not implemented for `[u16]`

error[E0308]: mismatched types
 --> /tmp/icemaker_global_tempdir.45pNVAwEMplG/rustc_testrunner_tmpdir_reporting.ZlwAFcmDkhGl/mvce.rs:1:20
  |
1 | const ARR: [u16] = [42, 43, 44, 500, 46, 47];
  |                    ^^^^^^^^^^^^^^^^^^^^^^^^^ expected `[u16]`, found `[u16; 6]`

error[E0277]: the size for values of type `[u16]` cannot be known at compilation time
 --> /tmp/icemaker_global_tempdir.45pNVAwEMplG/rustc_testrunner_tmpdir_reporting.ZlwAFcmDkhGl/mvce.rs:1:20
  |
1 | const ARR: [u16] = [42, 43, 44, 500, 46, 47];
  |                    ^^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
  |
  = help: the trait `Sized` is not implemented for `[u16]`
  = note: constant expressions must have a statically known size


thread 'rustc' panicked at compiler/rustc_const_eval/src/check_consts/check.rs:637:17:
fake borrows are always indirect
stack backtrace:
   0:     0x73cd7b62d410 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::h32b76eca82481332
   1:     0x73cd7be138e6 - core::fmt::write::h6aab99975a3e1e0d
   2:     0x73cd7cd04bd1 - std::io::Write::write_fmt::h07e3041152301b92
   3:     0x73cd7b62d272 - std::sys::backtrace::BacktraceLock::print::h11198f536c423f0e
   4:     0x73cd7b62f6f2 - std::panicking::default_hook::{{closure}}::hedf2549fe54c612d
   5:     0x73cd7b62f57a - std::panicking::default_hook::h5cafcda49fcb475d
   6:     0x73cd7a789e99 - std[65c60797a113df8d]::panicking::update_hook::<alloc[26d4a3e3ec5433a5]::boxed::Box<rustc_driver_impl[88e265ae9927f55c]::install_ice_hook::{closure#1}>>::{closure#0}
   7:     0x73cd7b630273 - std::panicking::rust_panic_with_hook::h9e0ce671ec08e8dc
   8:     0x73cd7b62ff36 - std::panicking::begin_panic_handler::{{closure}}::h1bdae80e81a52f07
   9:     0x73cd7b62d8f9 - std::sys::backtrace::__rust_end_short_backtrace::hba69e255f02ebb17
  10:     0x73cd7b62fc2d - rust_begin_unwind
  11:     0x73cd78252710 - core::panicking::panic_fmt::hb5ac2b35a2382f0f
  12:     0x73cd7c5d6a48 - <rustc_const_eval[82ed6d24565cf389]::check_consts::check::Checker as rustc_middle[c95cf357e72e9a85]::mir::visit::Visitor>::visit_basic_block_data
  13:     0x73cd7c5d4ed8 - <rustc_const_eval[82ed6d24565cf389]::check_consts::check::Checker>::check_body
  14:     0x73cd7c5b8fc3 - rustc_mir_transform[5e669e96cb5351c6]::mir_const_qualif
  15:     0x73cd7c5b8ea5 - rustc_query_impl[a79c5430108c0b60]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[a79c5430108c0b60]::query_impl::mir_const_qualif::dynamic_query::{closure#2}::{closure#0}, rustc_middle[c95cf357e72e9a85]::query::erase::Erased<[u8; 4usize]>>
  16:     0x73cd7c5b8431 - rustc_query_system[ff51b95ecba2cb21]::query::plumbing::try_execute_query::<rustc_query_impl[a79c5430108c0b60]::DynamicConfig<rustc_query_system[ff51b95ecba2cb21]::query::caches::DefIdCache<rustc_middle[c95cf357e72e9a85]::query::erase::Erased<[u8; 4usize]>>, false, false, false>, rustc_query_impl[a79c5430108c0b60]::plumbing::QueryCtxt, false>
  17:     0x73cd7c5b81a2 - rustc_query_impl[a79c5430108c0b60]::query_impl::mir_const_qualif::get_query_non_incr::__rust_end_short_backtrace
  18:     0x73cd7c5b7fcb - rustc_middle[c95cf357e72e9a85]::query::plumbing::query_get_at::<rustc_query_system[ff51b95ecba2cb21]::query::caches::DefIdCache<rustc_middle[c95cf357e72e9a85]::query::erase::Erased<[u8; 4usize]>>>
  19:     0x73cd79357ccb - rustc_mir_transform[5e669e96cb5351c6]::mir_promoted
  20:     0x73cd7c1e0dd4 - rustc_query_impl[a79c5430108c0b60]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[a79c5430108c0b60]::query_impl::mir_promoted::dynamic_query::{closure#2}::{closure#0}, rustc_middle[c95cf357e72e9a85]::query::erase::Erased<[u8; 16usize]>>
  21:     0x73cd7c1e1097 - rustc_query_system[ff51b95ecba2cb21]::query::plumbing::try_execute_query::<rustc_query_impl[a79c5430108c0b60]::DynamicConfig<rustc_data_structures[9c6ee9e9e5334c83]::vec_cache::VecCache<rustc_span[cb34d841a75ac9bc]::def_id::LocalDefId, rustc_middle[c95cf357e72e9a85]::query::erase::Erased<[u8; 16usize]>, rustc_query_system[ff51b95ecba2cb21]::dep_graph::graph::DepNodeIndex>, false, false, false>, rustc_query_impl[a79c5430108c0b60]::plumbing::QueryCtxt, false>
  22:     0x73cd7c1e0cda - rustc_query_impl[a79c5430108c0b60]::query_impl::mir_promoted::get_query_non_incr::__rust_end_short_backtrace
  23:     0x73cd7ceb0aef - rustc_query_impl[a79c5430108c0b60]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[a79c5430108c0b60]::query_impl::mir_borrowck::dynamic_query::{closure#2}::{closure#0}, rustc_middle[c95cf357e72e9a85]::query::erase::Erased<[u8; 8usize]>>
  24:     0x73cd7c1a580e - rustc_query_system[ff51b95ecba2cb21]::query::plumbing::try_execute_query::<rustc_query_impl[a79c5430108c0b60]::DynamicConfig<rustc_data_structures[9c6ee9e9e5334c83]::vec_cache::VecCache<rustc_span[cb34d841a75ac9bc]::def_id::LocalDefId, rustc_middle[c95cf357e72e9a85]::query::erase::Erased<[u8; 8usize]>, rustc_query_system[ff51b95ecba2cb21]::dep_graph::graph::DepNodeIndex>, false, false, false>, rustc_query_impl[a79c5430108c0b60]::plumbing::QueryCtxt, false>
  25:     0x73cd7c1a5325 - rustc_query_impl[a79c5430108c0b60]::query_impl::mir_borrowck::get_query_non_incr::__rust_end_short_backtrace
  26:     0x73cd7c1a4337 - rustc_mir_transform[5e669e96cb5351c6]::mir_drops_elaborated_and_const_checked
  27:     0x73cd7c1a3e65 - rustc_query_impl[a79c5430108c0b60]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[a79c5430108c0b60]::query_impl::mir_drops_elaborated_and_const_checked::dynamic_query::{closure#2}::{closure#0}, rustc_middle[c95cf357e72e9a85]::query::erase::Erased<[u8; 8usize]>>
  28:     0x73cd7c1a580e - rustc_query_system[ff51b95ecba2cb21]::query::plumbing::try_execute_query::<rustc_query_impl[a79c5430108c0b60]::DynamicConfig<rustc_data_structures[9c6ee9e9e5334c83]::vec_cache::VecCache<rustc_span[cb34d841a75ac9bc]::def_id::LocalDefId, rustc_middle[c95cf357e72e9a85]::query::erase::Erased<[u8; 8usize]>, rustc_query_system[ff51b95ecba2cb21]::dep_graph::graph::DepNodeIndex>, false, false, false>, rustc_query_impl[a79c5430108c0b60]::plumbing::QueryCtxt, false>
  29:     0x73cd7c1a0dcd - rustc_query_impl[a79c5430108c0b60]::query_impl::mir_drops_elaborated_and_const_checked::get_query_non_incr::__rust_end_short_backtrace
  30:     0x73cd7c5b8e80 - rustc_middle[c95cf357e72e9a85]::query::plumbing::query_get_at::<rustc_data_structures[9c6ee9e9e5334c83]::vec_cache::VecCache<rustc_span[cb34d841a75ac9bc]::def_id::LocalDefId, rustc_middle[c95cf357e72e9a85]::query::erase::Erased<[u8; 8usize]>, rustc_query_system[ff51b95ecba2cb21]::dep_graph::graph::DepNodeIndex>>
  31:     0x73cd7c5bb02e - rustc_mir_transform[5e669e96cb5351c6]::mir_for_ctfe
  32:     0x73cd7c5bafa3 - rustc_query_impl[a79c5430108c0b60]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[a79c5430108c0b60]::query_impl::mir_for_ctfe::dynamic_query::{closure#2}::{closure#0}, rustc_middle[c95cf357e72e9a85]::query::erase::Erased<[u8; 8usize]>>
  33:     0x73cd7bef265f - rustc_query_system[ff51b95ecba2cb21]::query::plumbing::try_execute_query::<rustc_query_impl[a79c5430108c0b60]::DynamicConfig<rustc_query_system[ff51b95ecba2cb21]::query::caches::DefIdCache<rustc_middle[c95cf357e72e9a85]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[a79c5430108c0b60]::plumbing::QueryCtxt, false>
  34:     0x73cd7bef059f - rustc_query_impl[a79c5430108c0b60]::query_impl::mir_for_ctfe::get_query_non_incr::__rust_end_short_backtrace
  35:     0x73cd7bef06e4 - <rustc_const_eval[82ed6d24565cf389]::interpret::eval_context::InterpCx<rustc_const_eval[82ed6d24565cf389]::const_eval::machine::CompileTimeMachine>>::load_mir
  36:     0x73cd797a0ab8 - rustc_const_eval[82ed6d24565cf389]::const_eval::eval_queries::eval_to_allocation_raw_provider
  37:     0x73cd7c67309c - rustc_query_impl[a79c5430108c0b60]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[a79c5430108c0b60]::query_impl::eval_to_allocation_raw::dynamic_query::{closure#2}::{closure#0}, rustc_middle[c95cf357e72e9a85]::query::erase::Erased<[u8; 24usize]>>
  38:     0x73cd7c672a3a - rustc_query_system[ff51b95ecba2cb21]::query::plumbing::try_execute_query::<rustc_query_impl[a79c5430108c0b60]::DynamicConfig<rustc_query_system[ff51b95ecba2cb21]::query::caches::DefaultCache<rustc_middle[c95cf357e72e9a85]::ty::PseudoCanonicalInput<rustc_middle[c95cf357e72e9a85]::mir::interpret::GlobalId>, rustc_middle[c95cf357e72e9a85]::query::erase::Erased<[u8; 24usize]>>, false, false, false>, rustc_query_impl[a79c5430108c0b60]::plumbing::QueryCtxt, false>
  39:     0x73cd7c6726bb - rustc_query_impl[a79c5430108c0b60]::query_impl::eval_to_allocation_raw::get_query_non_incr::__rust_end_short_backtrace
  40:     0x73cd7c64f46d - rustc_const_eval[82ed6d24565cf389]::const_eval::valtrees::eval_to_valtree
  41:     0x73cd7c64f23e - <rustc_const_eval[82ed6d24565cf389]::provide::{closure#0} as core[b38de05c6bab522f]::ops::function::FnOnce<(rustc_middle[c95cf357e72e9a85]::ty::context::TyCtxt, rustc_middle[c95cf357e72e9a85]::ty::PseudoCanonicalInput<rustc_middle[c95cf357e72e9a85]::mir::interpret::GlobalId>)>>::call_once
  42:     0x73cd7c64f1d0 - rustc_query_impl[a79c5430108c0b60]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[a79c5430108c0b60]::query_impl::eval_to_valtree::dynamic_query::{closure#2}::{closure#0}, rustc_middle[c95cf357e72e9a85]::query::erase::Erased<[u8; 24usize]>>
  43:     0x73cd7c64f189 - <rustc_query_impl[a79c5430108c0b60]::query_impl::eval_to_valtree::dynamic_query::{closure#2} as core[b38de05c6bab522f]::ops::function::FnOnce<(rustc_middle[c95cf357e72e9a85]::ty::context::TyCtxt, rustc_middle[c95cf357e72e9a85]::ty::PseudoCanonicalInput<rustc_middle[c95cf357e72e9a85]::mir::interpret::GlobalId>)>>::call_once
  44:     0x73cd7c672b13 - rustc_query_system[ff51b95ecba2cb21]::query::plumbing::try_execute_query::<rustc_query_impl[a79c5430108c0b60]::DynamicConfig<rustc_query_system[ff51b95ecba2cb21]::query::caches::DefaultCache<rustc_middle[c95cf357e72e9a85]::ty::PseudoCanonicalInput<rustc_middle[c95cf357e72e9a85]::mir::interpret::GlobalId>, rustc_middle[c95cf357e72e9a85]::query::erase::Erased<[u8; 24usize]>>, false, false, false>, rustc_query_impl[a79c5430108c0b60]::plumbing::QueryCtxt, false>
  45:     0x73cd7c67242d - rustc_query_impl[a79c5430108c0b60]::query_impl::eval_to_valtree::get_query_non_incr::__rust_end_short_backtrace
  46:     0x73cd7c7acb0c - rustc_middle[c95cf357e72e9a85]::query::plumbing::query_get_at::<rustc_query_system[ff51b95ecba2cb21]::query::caches::DefaultCache<rustc_middle[c95cf357e72e9a85]::ty::PseudoCanonicalInput<rustc_middle[c95cf357e72e9a85]::mir::interpret::GlobalId>, rustc_middle[c95cf357e72e9a85]::query::erase::Erased<[u8; 24usize]>>>
  47:     0x73cd7c7ac122 - <rustc_middle[c95cf357e72e9a85]::ty::context::TyCtxt>::const_eval_global_id_for_typeck
  48:     0x73cd7c7abfb9 - <rustc_middle[c95cf357e72e9a85]::ty::context::TyCtxt>::const_eval_resolve_for_typeck
  49:     0x73cd7c7abcf7 - rustc_trait_selection[d3a832fb8e061b24]::traits::try_evaluate_const
  50:     0x73cd7c7ab783 - <rustc_trait_selection[d3a832fb8e061b24]::traits::normalize::AssocTypeNormalizer as rustc_type_ir[6a899794ba15143]::fold::TypeFolder<rustc_middle[c95cf357e72e9a85]::ty::context::TyCtxt>>::fold_const
  51:     0x73cd7c7c39ae - <rustc_middle[c95cf357e72e9a85]::ty::Ty as rustc_type_ir[6a899794ba15143]::fold::TypeSuperFoldable<rustc_middle[c95cf357e72e9a85]::ty::context::TyCtxt>>::try_super_fold_with::<rustc_trait_selection[d3a832fb8e061b24]::traits::normalize::AssocTypeNormalizer>
  52:     0x73cd7c46cc59 - <rustc_hir_analysis[52c5e5868dd20650]::check::wfcheck::WfCheckingCtxt>::normalize::<rustc_middle[c95cf357e72e9a85]::ty::Ty>
  53:     0x73cd7c470bdd - rustc_hir_analysis[52c5e5868dd20650]::check::wfcheck::check_item_type
  54:     0x73cd7c465741 - rustc_hir_analysis[52c5e5868dd20650]::check::wfcheck::check_well_formed
  55:     0x73cd7c464187 - rustc_query_impl[a79c5430108c0b60]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[a79c5430108c0b60]::query_impl::check_well_formed::dynamic_query::{closure#2}::{closure#0}, rustc_middle[c95cf357e72e9a85]::query::erase::Erased<[u8; 1usize]>>
  56:     0x73cd7c463c29 - rustc_query_system[ff51b95ecba2cb21]::query::plumbing::try_execute_query::<rustc_query_impl[a79c5430108c0b60]::DynamicConfig<rustc_data_structures[9c6ee9e9e5334c83]::vec_cache::VecCache<rustc_span[cb34d841a75ac9bc]::def_id::LocalDefId, rustc_middle[c95cf357e72e9a85]::query::erase::Erased<[u8; 1usize]>, rustc_query_system[ff51b95ecba2cb21]::dep_graph::graph::DepNodeIndex>, false, false, false>, rustc_query_impl[a79c5430108c0b60]::plumbing::QueryCtxt, false>
  57:     0x73cd7c463686 - rustc_query_impl[a79c5430108c0b60]::query_impl::check_well_formed::get_query_non_incr::__rust_end_short_backtrace
  58:     0x73cd7c4612ac - rustc_hir_analysis[52c5e5868dd20650]::check::wfcheck::check_mod_type_wf
  59:     0x73cd7c4610cb - rustc_query_impl[a79c5430108c0b60]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[a79c5430108c0b60]::query_impl::check_mod_type_wf::dynamic_query::{closure#2}::{closure#0}, rustc_middle[c95cf357e72e9a85]::query::erase::Erased<[u8; 1usize]>>
  60:     0x73cd7cd85948 - rustc_query_system[ff51b95ecba2cb21]::query::plumbing::try_execute_query::<rustc_query_impl[a79c5430108c0b60]::DynamicConfig<rustc_query_system[ff51b95ecba2cb21]::query::caches::DefaultCache<rustc_span[cb34d841a75ac9bc]::def_id::LocalModDefId, rustc_middle[c95cf357e72e9a85]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[a79c5430108c0b60]::plumbing::QueryCtxt, false>
  61:     0x73cd7cd856f0 - rustc_query_impl[a79c5430108c0b60]::query_impl::check_mod_type_wf::get_query_non_incr::__rust_end_short_backtrace
  62:     0x73cd7c1a10e6 - rustc_hir_analysis[52c5e5868dd20650]::check_crate
  63:     0x73cd7c19dc64 - rustc_interface[3e4af95fb941106a]::passes::run_required_analyses
  64:     0x73cd7cd002de - rustc_interface[3e4af95fb941106a]::passes::analysis
  65:     0x73cd7cd002af - rustc_query_impl[a79c5430108c0b60]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[a79c5430108c0b60]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[c95cf357e72e9a85]::query::erase::Erased<[u8; 0usize]>>
  66:     0x73cd7ccec015 - rustc_query_system[ff51b95ecba2cb21]::query::plumbing::try_execute_query::<rustc_query_impl[a79c5430108c0b60]::DynamicConfig<rustc_query_system[ff51b95ecba2cb21]::query::caches::SingleCache<rustc_middle[c95cf357e72e9a85]::query::erase::Erased<[u8; 0usize]>>, false, false, false>, rustc_query_impl[a79c5430108c0b60]::plumbing::QueryCtxt, false>
  67:     0x73cd7ccebd4e - rustc_query_impl[a79c5430108c0b60]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  68:     0x73cd7ce0be69 - rustc_interface[3e4af95fb941106a]::passes::create_and_enter_global_ctxt::<core[b38de05c6bab522f]::option::Option<rustc_interface[3e4af95fb941106a]::queries::Linker>, rustc_driver_impl[88e265ae9927f55c]::run_compiler::{closure#0}::{closure#2}>::{closure#2}::{closure#0}
  69:     0x73cd7cd5a498 - rustc_interface[3e4af95fb941106a]::interface::run_compiler::<(), rustc_driver_impl[88e265ae9927f55c]::run_compiler::{closure#0}>::{closure#1}
  70:     0x73cd7cc75f35 - std[65c60797a113df8d]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[3e4af95fb941106a]::util::run_in_thread_with_globals<rustc_interface[3e4af95fb941106a]::util::run_in_thread_pool_with_globals<rustc_interface[3e4af95fb941106a]::interface::run_compiler<(), rustc_driver_impl[88e265ae9927f55c]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
  71:     0x73cd7cc75c19 - <<std[65c60797a113df8d]::thread::Builder>::spawn_unchecked_<rustc_interface[3e4af95fb941106a]::util::run_in_thread_with_globals<rustc_interface[3e4af95fb941106a]::util::run_in_thread_pool_with_globals<rustc_interface[3e4af95fb941106a]::interface::run_compiler<(), rustc_driver_impl[88e265ae9927f55c]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core[b38de05c6bab522f]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  72:     0x73cd7cc753ab - std::sys::pal::unix::thread::Thread::new::thread_start::h7b9c2e4fdae6f3c1
  73:     0x73cd76ea339d - <unknown>
  74:     0x73cd76f2849c - <unknown>
  75:                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 1.86.0-nightly (e6f12c8b7 2025-01-30) running on x86_64-unknown-linux-gnu

query stack during panic:
#0 [mir_const_qualif] const checking `BONG::{constant#0}`
#1 [mir_promoted] promoting constants in MIR for `BONG::{constant#0}`
#2 [mir_borrowck] borrow-checking `BONG::{constant#0}`
#3 [mir_drops_elaborated_and_const_checked] elaborating drops for `BONG::{constant#0}`
#4 [mir_for_ctfe] caching mir of `BONG::{constant#0}` for CTFE
#5 [eval_to_allocation_raw] const-evaluating + checking `BONG::{constant#0}`
#6 [eval_to_valtree] evaluating type-level constant
#7 [check_well_formed] checking that `BONG` is well-formed
#8 [check_mod_type_wf] checking that types are well-formed in top-level module
#9 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 4 previous errors

Some errors have detailed explanations: E0277, E0308, E0601.
For more information about an error, try `rustc --explain E0277`.

@matthiaskrgr matthiaskrgr added C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Jan 30, 2025
@rustbot rustbot added the needs-triage This issue may need triage. Remove it if it has been sufficiently triaged. label Jan 30, 2025
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const A: [u16] = [0];
const B: &[i32] = &[0; A[0] as usize];

pub fn main() {}

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bisects to #135748 🐱 cc @compiler-errors

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more minimal:

const ONE: [u16] = [1];

const TWO: u16 = ONE[0];

@compiler-errors compiler-errors linked a pull request Jan 31, 2025 that will close this issue
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C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ needs-triage This issue may need triage. Remove it if it has been sufficiently triaged. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
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Delay a bug when indexing unsized slices compiler-errors/rust
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