ICE+errors: associated_const_equality: normalize_erasing_regions.rs: Failed to normalize Alias(Projection, _)

[sigurd4]

This is a regression that happened after updating the rust nightly toolchain today to version 3e674b0 2025-05-23. Suddenly, the compiler is not able to reason with associated const equality at all, and i get a rust-ICE that fails checking if an associated type is well formed.

Code

real_time_fir_iir_filters as of commit 687912d: sigurd4/real_time_fir_iir_filters@687912d

Meta

rustc --version --verbose:

rustc 1.89.0-nightly (3e674b06b 2025-05-23)
binary: rustc
commit-hash: 3e674b06b5c74adea662bd0b0b06450757994b16
commit-date: 2025-05-23
host: x86_64-unknown-linux-gnu
release: 1.89.0-nightly
LLVM version: 20.1.5

Error output

thread 'rustc' panicked at compiler/rustc_middle/src/ty/normalize_erasing_regions.rs:171:13:
Box<dyn Any>
stack backtrace:
   0:     0x705a98ad9ee5 - std::backtrace::Backtrace::create::hfa425f8c6118c291
   1:     0x705a96f58655 - std::backtrace::Backtrace::force_capture::hc89ba712c3edf9d4
   2:     0x705a95f9b841 - std[dddea0bc0c38a8db]::panicking::update_hook::<alloc[ad07e7cbb7f1de4e]::boxed::Box<rustc_driver_impl[40f87d5870cfacca]::install_ice_hook::{closure#1}>>::{closure#0}
   3:     0x705a96f72583 - std::panicking::rust_panic_with_hook::hedd3f60f85824998
   4:     0x705a95fd6f01 - std[dddea0bc0c38a8db]::panicking::begin_panic::<rustc_errors[ddb65c6d6f619c9c]::ExplicitBug>::{closure#0}
   5:     0x705a95fcaf36 - std[dddea0bc0c38a8db]::sys::backtrace::__rust_end_short_backtrace::<std[dddea0bc0c38a8db]::panicking::begin_panic<rustc_errors[ddb65c6d6f619c9c]::ExplicitBug>::{closure#0}, !>
   6:     0x705a95fcadbb - std[dddea0bc0c38a8db]::panicking::begin_panic::<rustc_errors[ddb65c6d6f619c9c]::ExplicitBug>
   7:     0x705a95fe1551 - <rustc_errors[ddb65c6d6f619c9c]::diagnostic::BugAbort as rustc_errors[ddb65c6d6f619c9c]::diagnostic::EmissionGuarantee>::emit_producing_guarantee
   8:     0x705a9664be9a - rustc_middle[39ac76d544e79577]::util::bug::opt_span_bug_fmt::<rustc_span[c5073483e6fe6d4e]::span_encoding::Span>::{closure#0}
   9:     0x705a9662627a - rustc_middle[39ac76d544e79577]::ty::context::tls::with_opt::<rustc_middle[39ac76d544e79577]::util::bug::opt_span_bug_fmt<rustc_span[c5073483e6fe6d4e]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  10:     0x705a966260eb - rustc_middle[39ac76d544e79577]::ty::context::tls::with_context_opt::<rustc_middle[39ac76d544e79577]::ty::context::tls::with_opt<rustc_middle[39ac76d544e79577]::util::bug::opt_span_bug_fmt<rustc_span[c5073483e6fe6d4e]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  11:     0x705a9388aa70 - rustc_middle[39ac76d544e79577]::util::bug::bug_fmt
  12:     0x705a97e56e5a - <rustc_middle[39ac76d544e79577]::ty::normalize_erasing_regions::NormalizeAfterErasingRegionsFolder as rustc_type_ir[ad99d0ade262f0a7]::fold::TypeFolder<rustc_middle[39ac76d544e79577]::ty::context::TyCtxt>>::fold_ty
  13:     0x705a97ebc030 - rustc_ty_utils[8532ffd2d527787a]::instance::resolve_instance_raw
  14:     0x705a97ebb472 - rustc_query_impl[31296628a992b875]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[31296628a992b875]::query_impl::resolve_instance_raw::dynamic_query::{closure#2}::{closure#0}, rustc_middle[39ac76d544e79577]::query::erase::Erased<[u8; 32usize]>>
  15:     0x705a97ea566a - rustc_query_system[71c12886ffe7ba46]::query::plumbing::try_execute_query::<rustc_query_impl[31296628a992b875]::DynamicConfig<rustc_query_system[71c12886ffe7ba46]::query::caches::DefaultCache<rustc_middle[39ac76d544e79577]::ty::PseudoCanonicalInput<(rustc_span[c5073483e6fe6d4e]::def_id::DefId, &rustc_middle[39ac76d544e79577]::ty::list::RawList<(), rustc_middle[39ac76d544e79577]::ty::generic_args::GenericArg>)>, rustc_middle[39ac76d544e79577]::query::erase::Erased<[u8; 32usize]>>, false, false, false>, rustc_query_impl[31296628a992b875]::plumbing::QueryCtxt, true>
  16:     0x705a97ea4edb - rustc_query_impl[31296628a992b875]::query_impl::resolve_instance_raw::get_query_incr::__rust_end_short_backtrace
  17:     0x705a97681e64 - <rustc_middle[39ac76d544e79577]::ty::instance::Instance>::try_resolve
  18:     0x705a981c0c98 - <rustc_middle[39ac76d544e79577]::ty::context::TyCtxt>::const_eval_resolve_for_typeck
  19:     0x705a981c2301 - rustc_trait_selection[b780273fca010d7d]::traits::try_evaluate_const
  20:     0x705a97716983 - <rustc_trait_selection[b780273fca010d7d]::traits::select::SelectionContext>::evaluate_predicate_recursively
  21:     0x705a977159df - <rustc_trait_selection[b780273fca010d7d]::traits::select::SelectionContext>::evaluate_predicates_recursively::<thin_vec[6b3c3df00a28182b]::ThinVec<rustc_infer[b943a2e86216d821]::traits::Obligation<rustc_middle[39ac76d544e79577]::ty::predicate::Predicate>>>
  22:     0x705a97716020 - <rustc_trait_selection[b780273fca010d7d]::traits::select::SelectionContext>::evaluate_predicate_recursively
  23:     0x705a977159df - <rustc_trait_selection[b780273fca010d7d]::traits::select::SelectionContext>::evaluate_predicates_recursively::<thin_vec[6b3c3df00a28182b]::ThinVec<rustc_infer[b943a2e86216d821]::traits::Obligation<rustc_middle[39ac76d544e79577]::ty::predicate::Predicate>>>
  24:     0x705a97716783 - <rustc_trait_selection[b780273fca010d7d]::traits::select::SelectionContext>::evaluate_predicate_recursively
  25:     0x705a977159df - <rustc_trait_selection[b780273fca010d7d]::traits::select::SelectionContext>::evaluate_predicates_recursively::<thin_vec[6b3c3df00a28182b]::ThinVec<rustc_infer[b943a2e86216d821]::traits::Obligation<rustc_middle[39ac76d544e79577]::ty::predicate::Predicate>>>
  26:     0x705a97716020 - <rustc_trait_selection[b780273fca010d7d]::traits::select::SelectionContext>::evaluate_predicate_recursively
  27:     0x705a977159df - <rustc_trait_selection[b780273fca010d7d]::traits::select::SelectionContext>::evaluate_predicates_recursively::<thin_vec[6b3c3df00a28182b]::ThinVec<rustc_infer[b943a2e86216d821]::traits::Obligation<rustc_middle[39ac76d544e79577]::ty::predicate::Predicate>>>
  28:     0x705a97718a74 - <rustc_trait_selection[b780273fca010d7d]::traits::select::SelectionContext>::evaluate_candidate::{closure#0}::{closure#0}
  29:     0x705a984ea6e1 - <rustc_trait_selection[b780273fca010d7d]::traits::select::SelectionContext>::candidate_from_obligation::{closure#0}::{closure#0}
  30:     0x705a97fc9474 - <rustc_trait_selection[b780273fca010d7d]::traits::fulfill::FulfillProcessor as rustc_data_structures[7330a1b528a7fb9e]::obligation_forest::ObligationProcessor>::process_obligation
  31:     0x705a97606fd5 - <rustc_data_structures[7330a1b528a7fb9e]::obligation_forest::ObligationForest<rustc_trait_selection[b780273fca010d7d]::traits::fulfill::PendingPredicateObligation>>::process_obligations::<rustc_trait_selection[b780273fca010d7d]::traits::fulfill::FulfillProcessor>
  32:     0x705a97ce79ab - <rustc_trait_selection[b780273fca010d7d]::traits::fulfill::FulfillmentContext<rustc_trait_selection[b780273fca010d7d]::traits::FulfillmentError> as rustc_infer[b943a2e86216d821]::traits::engine::TraitEngine<rustc_trait_selection[b780273fca010d7d]::traits::FulfillmentError>>::select_all_or_error
  33:     0x705a97f15102 - rustc_hir_analysis[331e481bef3bedb8]::check::wfcheck::enter_wf_checking_ctxt::<rustc_hir_analysis[331e481bef3bedb8]::check::wfcheck::check_associated_item::{closure#0}>
  34:     0x705a97efad84 - rustc_hir_analysis[331e481bef3bedb8]::check::wfcheck::check_well_formed
  35:     0x705a97ef874b - rustc_query_impl[31296628a992b875]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[31296628a992b875]::query_impl::check_well_formed::dynamic_query::{closure#2}::{closure#0}, rustc_middle[39ac76d544e79577]::query::erase::Erased<[u8; 1usize]>>
  36:     0x705a9797756d - rustc_query_system[71c12886ffe7ba46]::query::plumbing::try_execute_query::<rustc_query_impl[31296628a992b875]::DynamicConfig<rustc_data_structures[7330a1b528a7fb9e]::vec_cache::VecCache<rustc_span[c5073483e6fe6d4e]::def_id::LocalDefId, rustc_middle[39ac76d544e79577]::query::erase::Erased<[u8; 1usize]>, rustc_query_system[71c12886ffe7ba46]::dep_graph::graph::DepNodeIndex>, false, false, false>, rustc_query_impl[31296628a992b875]::plumbing::QueryCtxt, true>
  37:     0x705a97976cfa - rustc_query_impl[31296628a992b875]::query_impl::check_well_formed::get_query_incr::__rust_end_short_backtrace
  38:     0x705a97ef53c2 - rustc_hir_analysis[331e481bef3bedb8]::check::wfcheck::check_mod_type_wf
  39:     0x705a97ef4e5f - rustc_query_impl[31296628a992b875]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[31296628a992b875]::query_impl::check_mod_type_wf::dynamic_query::{closure#2}::{closure#0}, rustc_middle[39ac76d544e79577]::query::erase::Erased<[u8; 1usize]>>
  40:     0x705a986802af - rustc_query_system[71c12886ffe7ba46]::query::plumbing::try_execute_query::<rustc_query_impl[31296628a992b875]::DynamicConfig<rustc_query_system[71c12886ffe7ba46]::query::caches::DefaultCache<rustc_span[c5073483e6fe6d4e]::def_id::LocalModDefId, rustc_middle[39ac76d544e79577]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[31296628a992b875]::plumbing::QueryCtxt, true>
  41:     0x705a98680d83 - rustc_query_impl[31296628a992b875]::query_impl::check_mod_type_wf::get_query_incr::__rust_end_short_backtrace
  42:     0x705a97809877 - rustc_hir_analysis[331e481bef3bedb8]::check_crate
  43:     0x705a9780ad45 - rustc_interface[3a0a2c43e50c5194]::passes::run_required_analyses
  44:     0x705a9852c19e - rustc_interface[3a0a2c43e50c5194]::passes::analysis
  45:     0x705a9852c175 - rustc_query_impl[31296628a992b875]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[31296628a992b875]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[39ac76d544e79577]::query::erase::Erased<[u8; 0usize]>>
  46:     0x705a988cf6c4 - rustc_query_system[71c12886ffe7ba46]::query::plumbing::try_execute_query::<rustc_query_impl[31296628a992b875]::DynamicConfig<rustc_query_system[71c12886ffe7ba46]::query::caches::SingleCache<rustc_middle[39ac76d544e79577]::query::erase::Erased<[u8; 0usize]>>, false, false, false>, rustc_query_impl[31296628a992b875]::plumbing::QueryCtxt, true>
  47:     0x705a988cefe8 - rustc_query_impl[31296628a992b875]::query_impl::analysis::get_query_incr::__rust_end_short_backtrace
  48:     0x705a9872ae87 - rustc_interface[3a0a2c43e50c5194]::passes::create_and_enter_global_ctxt::<core[a1eebbb7364c739]::option::Option<rustc_interface[3a0a2c43e50c5194]::queries::Linker>, rustc_driver_impl[40f87d5870cfacca]::run_compiler::{closure#0}::{closure#2}>::{closure#2}::{closure#0}
  49:     0x705a9871c60f - rustc_interface[3a0a2c43e50c5194]::interface::run_compiler::<(), rustc_driver_impl[40f87d5870cfacca]::run_compiler::{closure#0}>::{closure#1}
  50:     0x705a986c5706 - std[dddea0bc0c38a8db]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[3a0a2c43e50c5194]::util::run_in_thread_with_globals<rustc_interface[3a0a2c43e50c5194]::util::run_in_thread_pool_with_globals<rustc_interface[3a0a2c43e50c5194]::interface::run_compiler<(), rustc_driver_impl[40f87d5870cfacca]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
  51:     0x705a986c53ab - <<std[dddea0bc0c38a8db]::thread::Builder>::spawn_unchecked_<rustc_interface[3a0a2c43e50c5194]::util::run_in_thread_with_globals<rustc_interface[3a0a2c43e50c5194]::util::run_in_thread_pool_with_globals<rustc_interface[3a0a2c43e50c5194]::interface::run_compiler<(), rustc_driver_impl[40f87d5870cfacca]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core[a1eebbb7364c739]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  52:     0x705a986c66fd - std::sys::pal::unix::thread::Thread::new::thread_start::h337190b46df16ff4
  53:     0x705a924a57eb - <unknown>
  54:     0x705a9252918c - <unknown>
  55:                0x0 - <unknown>


rustc version: 1.89.0-nightly (3e674b06b 2025-05-23)
platform: x86_64-unknown-linux-gnu

query stack during panic:
#0 [resolve_instance_raw] resolving instance `<param::val::omega::Omega<f32> as param::base::chebyshev::ChebyshevFilterParamBase<<f32 as param::conf::elliptic::EllipticFilterConf>::Conf>>::TYPE`
#1 [check_well_formed] checking that `param::conf::elliptic::EllipticFilterConf::Conf` is well-formed
#2 [check_mod_type_wf] checking that types are well-formed in module `param::conf::elliptic`
#3 [analysis] running analysis passes on this crate
end of query stack

Backtrace

I can't compile, so i can't see any backtrace for my code.

[moxian]

Smaller:

#![feature(associated_const_equality)]

pub enum LowPass {}
pub trait ConfTrait {}
impl ConfTrait for LowPass {}

pub trait FirstOrderFilterConf: ConfTrait {
    const OUTPUTS: usize = 0;
}

impl FirstOrderFilterConf for LowPass {}

pub trait ButterworthFilterConf: ConfTrait {
    type Assoc;
}

impl<C, const OUTPUTS: usize> ButterworthFilterConf for C
where
    C: FirstOrderFilterConf<OUTPUTS = { OUTPUTS }>,
{
    type Assoc = Self;
}

fn make_coeffs() {
    fn make_coeffs_inner()
    where
        LowPass: ButterworthFilterConf<Assoc = LowPass>,
    {
    }

    make_coeffs_inner()
}

I feel this still can be golfed down further, but I'm struggling to do so myself. I'll leave the label on, just in case

Bisects to #136988 (nightly-2025-05-16), cc @compiler-errors FYI

I also want to note that the stacktrace for me is somewhat different from the one in the OP, both in the original repro and in the minimization. Perhaps we can blame it on a slightly different rustc version being used (both the commit and the linux/windows diff)

> rustc -vV
rustc 1.89.0-nightly (16d2276fa 2025-05-16)
binary: rustc
commit-hash: 16d2276fa6fccb0cc239a542d4c3f0eb46f660ec
commit-date: 2025-05-16
host: x86_64-pc-windows-msvc
release: 1.89.0-nightly
LLVM version: 20.1.4

Backtrace

thread 'rustc' panicked at /rustc/16d2276fa6fccb0cc239a542d4c3f0eb46f660ec\compiler\rustc_next_trait_solver\src\solve\normalizes_to\mod.rs:373:25:
associated const projection is not supported yet
stack backtrace:
   0:     0x7ffbc0077e42 - std::backtrace_rs::backtrace::win64::trace
                               at /rustc/16d2276fa6fccb0cc239a542d4c3f0eb46f660ec/library\std\src\..\..\backtrace\src\backtrace\win64.rs:85
   1:     0x7ffbc0077e42 - std::backtrace_rs::backtrace::trace_unsynchronized
                               at /rustc/16d2276fa6fccb0cc239a542d4c3f0eb46f660ec/library\std\src\..\..\backtrace\src\backtrace\mod.rs:66
   2:     0x7ffbc0077e42 - std::sys::backtrace::_print_fmt
                               at /rustc/16d2276fa6fccb0cc239a542d4c3f0eb46f660ec/library\std\src\sys\backtrace.rs:66
   3:     0x7ffbc0077e42 - std::sys::backtrace::impl$0::print::impl$0::fmt
                               at /rustc/16d2276fa6fccb0cc239a542d4c3f0eb46f660ec/library\std\src\sys\backtrace.rs:39
   4:     0x7ffbc00aa70b - core::fmt::rt::Argument::fmt
                               at /rustc/16d2276fa6fccb0cc239a542d4c3f0eb46f660ec/library\core\src\fmt\rt.rs:173
   5:     0x7ffbc00aa70b - core::fmt::write
                               at /rustc/16d2276fa6fccb0cc239a542d4c3f0eb46f660ec/library\core\src\fmt\mod.rs:1446
   6:     0x7ffbc006df67 - std::io::default_write_fmt
                               at /rustc/16d2276fa6fccb0cc239a542d4c3f0eb46f660ec/library\std\src\io\mod.rs:639
   7:     0x7ffbc006df67 - std::io::Write::write_fmt<std::sys::stdio::windows::Stderr>
                               at /rustc/16d2276fa6fccb0cc239a542d4c3f0eb46f660ec/library\std\src\io\mod.rs:1914
   8:     0x7ffbc0077c85 - std::sys::backtrace::BacktraceLock::print
                               at /rustc/16d2276fa6fccb0cc239a542d4c3f0eb46f660ec/library\std\src\sys\backtrace.rs:42
   9:     0x7ffbc007d90a - std::panicking::default_hook::closure$0
                               at /rustc/16d2276fa6fccb0cc239a542d4c3f0eb46f660ec/library\std\src\panicking.rs:300
  10:     0x7ffbc007d6a0 - std::panicking::default_hook
                               at /rustc/16d2276fa6fccb0cc239a542d4c3f0eb46f660ec/library\std\src\panicking.rs:327
  11:     0x7ffbc17a6dff - core[40ae789e6e20048b]::slice::sort::unstable::heapsort::heapsort::<((rustc_lint_defs[cf5270d878c02699]::Level, &str), usize), <((rustc_lint_defs[cf5270d878c02699]::Level, &str), usize) as core[40ae789e6e20048b]::cmp::PartialOrd>::lt>
  12:     0x7ffbc007e59e - std::panicking::rust_panic_with_hook
                               at /rustc/16d2276fa6fccb0cc239a542d4c3f0eb46f660ec/library\std\src\panicking.rs:841
  13:     0x7ffbc007e2c2 - std::panicking::begin_panic_handler::closure$0
                               at /rustc/16d2276fa6fccb0cc239a542d4c3f0eb46f660ec/library\std\src\panicking.rs:699
  14:     0x7ffbc0078c0f - std::sys::backtrace::__rust_end_short_backtrace<std::panicking::begin_panic_handler::closure_env$0,never$>
                               at /rustc/16d2276fa6fccb0cc239a542d4c3f0eb46f660ec/library\std\src\sys\backtrace.rs:168
  15:     0x7ffbc007defe - std::panicking::begin_panic_handler
                               at /rustc/16d2276fa6fccb0cc239a542d4c3f0eb46f660ec/library\std\src\panicking.rs:697
  16:     0x7ffbc3242b41 - core::panicking::panic_fmt
                               at /rustc/16d2276fa6fccb0cc239a542d4c3f0eb46f660ec/library\core\src\panicking.rs:75
  17:     0x7ffbbfcd6171 - <alloc[ee1f1ee951f73eea]::raw_vec::RawVec<rustc_trait_selection[513478723f40218b]::solve::inspect::analyse::InspectCandidate>>::grow_one
  18:     0x7ffbbfc92f91 - rustc_codegen_ssa[9b23cbaa8d307b18]::debuginfo::type_names::compute_debuginfo_vtable_name
  19:     0x7ffbbfcb8c50 - rustc_codegen_ssa[9b23cbaa8d307b18]::debuginfo::type_names::compute_debuginfo_vtable_name
  20:     0x7ffbbfc9d230 - rustc_codegen_ssa[9b23cbaa8d307b18]::debuginfo::type_names::compute_debuginfo_vtable_name
  21:     0x7ffbbfcc47c3 - <alloc[ee1f1ee951f73eea]::raw_vec::RawVec<rustc_trait_selection[513478723f40218b]::solve::inspect::analyse::InspectCandidate>>::grow_one
  22:     0x7ffbbfcc7302 - <alloc[ee1f1ee951f73eea]::raw_vec::RawVec<rustc_trait_selection[513478723f40218b]::solve::inspect::analyse::InspectCandidate>>::grow_one
  23:     0x7ffbbfcb84b0 - rustc_codegen_ssa[9b23cbaa8d307b18]::debuginfo::type_names::compute_debuginfo_vtable_name
  24:     0x7ffbbfc9d230 - rustc_codegen_ssa[9b23cbaa8d307b18]::debuginfo::type_names::compute_debuginfo_vtable_name
  25:     0x7ffbbfcc47c3 - <alloc[ee1f1ee951f73eea]::raw_vec::RawVec<rustc_trait_selection[513478723f40218b]::solve::inspect::analyse::InspectCandidate>>::grow_one
  26:     0x7ffbbfcc421a - <alloc[ee1f1ee951f73eea]::raw_vec::RawVec<rustc_trait_selection[513478723f40218b]::solve::inspect::analyse::InspectCandidate>>::grow_one
  27:     0x7ffbbfcc70e8 - <alloc[ee1f1ee951f73eea]::raw_vec::RawVec<rustc_trait_selection[513478723f40218b]::solve::inspect::analyse::InspectCandidate>>::grow_one
  28:     0x7ffbbfcc1154 - rustc_codegen_ssa[9b23cbaa8d307b18]::debuginfo::type_names::compute_debuginfo_vtable_name
  29:     0x7ffbbfcb90a4 - rustc_codegen_ssa[9b23cbaa8d307b18]::debuginfo::type_names::compute_debuginfo_vtable_name
  30:     0x7ffbbfc9d230 - rustc_codegen_ssa[9b23cbaa8d307b18]::debuginfo::type_names::compute_debuginfo_vtable_name
  31:     0x7ffbbfcc47c3 - <alloc[ee1f1ee951f73eea]::raw_vec::RawVec<rustc_trait_selection[513478723f40218b]::solve::inspect::analyse::InspectCandidate>>::grow_one
  32:     0x7ffbbfcc421a - <alloc[ee1f1ee951f73eea]::raw_vec::RawVec<rustc_trait_selection[513478723f40218b]::solve::inspect::analyse::InspectCandidate>>::grow_one
  33:     0x7ffbbfcc70e8 - <alloc[ee1f1ee951f73eea]::raw_vec::RawVec<rustc_trait_selection[513478723f40218b]::solve::inspect::analyse::InspectCandidate>>::grow_one
  34:     0x7ffbbfcc1154 - rustc_codegen_ssa[9b23cbaa8d307b18]::debuginfo::type_names::compute_debuginfo_vtable_name
  35:     0x7ffbbfcd08c6 - <alloc[ee1f1ee951f73eea]::raw_vec::RawVec<rustc_trait_selection[513478723f40218b]::solve::inspect::analyse::InspectCandidate>>::grow_one
  36:     0x7ffbc101846f - rustc_codegen_ssa[9b23cbaa8d307b18]::mir::find_cold_blocks
  37:     0x7ffbbfcb8b74 - rustc_codegen_ssa[9b23cbaa8d307b18]::debuginfo::type_names::compute_debuginfo_vtable_name
  38:     0x7ffbbfc9d230 - rustc_codegen_ssa[9b23cbaa8d307b18]::debuginfo::type_names::compute_debuginfo_vtable_name
  39:     0x7ffbbfcc47c3 - <alloc[ee1f1ee951f73eea]::raw_vec::RawVec<rustc_trait_selection[513478723f40218b]::solve::inspect::analyse::InspectCandidate>>::grow_one
  40:     0x7ffbbfcc7302 - <alloc[ee1f1ee951f73eea]::raw_vec::RawVec<rustc_trait_selection[513478723f40218b]::solve::inspect::analyse::InspectCandidate>>::grow_one
  41:     0x7ffbbfcb84b0 - rustc_codegen_ssa[9b23cbaa8d307b18]::debuginfo::type_names::compute_debuginfo_vtable_name
  42:     0x7ffbbfc9d230 - rustc_codegen_ssa[9b23cbaa8d307b18]::debuginfo::type_names::compute_debuginfo_vtable_name
  43:     0x7ffbbfcc47c3 - <alloc[ee1f1ee951f73eea]::raw_vec::RawVec<rustc_trait_selection[513478723f40218b]::solve::inspect::analyse::InspectCandidate>>::grow_one
  44:     0x7ffbbfcc421a - <alloc[ee1f1ee951f73eea]::raw_vec::RawVec<rustc_trait_selection[513478723f40218b]::solve::inspect::analyse::InspectCandidate>>::grow_one
  45:     0x7ffbbfcc70e8 - <alloc[ee1f1ee951f73eea]::raw_vec::RawVec<rustc_trait_selection[513478723f40218b]::solve::inspect::analyse::InspectCandidate>>::grow_one
  46:     0x7ffbbfcc1154 - rustc_codegen_ssa[9b23cbaa8d307b18]::debuginfo::type_names::compute_debuginfo_vtable_name
  47:     0x7ffbbfcb90a4 - rustc_codegen_ssa[9b23cbaa8d307b18]::debuginfo::type_names::compute_debuginfo_vtable_name
  48:     0x7ffbbfc9d230 - rustc_codegen_ssa[9b23cbaa8d307b18]::debuginfo::type_names::compute_debuginfo_vtable_name
  49:     0x7ffbbfcc47c3 - <alloc[ee1f1ee951f73eea]::raw_vec::RawVec<rustc_trait_selection[513478723f40218b]::solve::inspect::analyse::InspectCandidate>>::grow_one
  50:     0x7ffbbfcc421a - <alloc[ee1f1ee951f73eea]::raw_vec::RawVec<rustc_trait_selection[513478723f40218b]::solve::inspect::analyse::InspectCandidate>>::grow_one
  51:     0x7ffbbfc97e09 - rustc_codegen_ssa[9b23cbaa8d307b18]::debuginfo::type_names::compute_debuginfo_vtable_name
  52:     0x7ffbc10cf84a - rustc_trait_selection[513478723f40218b]::traits::impossible_predicates
  53:     0x7ffbc0585d3b - <rustc_mir_transform[957be8d5d4cdc75a]::impossible_predicates::ImpossiblePredicates as rustc_mir_transform[957be8d5d4cdc75a]::pass_manager::MirPass>::run_pass
  54:     0x7ffbc0526343 - rustc_mir_transform[957be8d5d4cdc75a]::run_analysis_to_runtime_passes
  55:     0x7ffbc0524f1a - rustc_mir_transform[957be8d5d4cdc75a]::mir_drops_elaborated_and_const_checked
  56:     0x7ffbc0fcbe7b - rustc_query_impl[bfdc71e5d8a6abb3]::plumbing::query_key_hash_verify_all
  57:     0x7ffbc0f064e6 - RINvNtNtCsceq9HnlmPNX_18rustc_query_system5query8plumbing17try_execute_queryINtCsgtgSloM9rKF_16rustc_query_impl13DynamicConfigINtNtCskJc15ZtcHlN_21rustc_data_structures9vec_cache8VecCacheNtNtCs58xKICPkfbi_10rustc_span6def_id10LocalDefIdINtNtNtCs6RMfinxcFgq
  58:     0x7ffbc0fd0745 - rustc_query_impl[bfdc71e5d8a6abb3]::plumbing::query_key_hash_verify_all
  59:     0x7ffbc00e577d - <rustc_interface[2ad662657ecbf37f]::passes::LintStoreExpandImpl as rustc_expand[50964d8433ef3689]::base::LintStoreExpand>::pre_expansion_lint
  60:     0x7ffbbc9edc07 - rustc_interface[2ad662657ecbf37f]::passes::analysis
  61:     0x7ffbbfbfee1a - RINvNtNtCsceq9HnlmPNX_18rustc_query_system5query8plumbing17try_execute_queryINtCsgtgSloM9rKF_16rustc_query_impl13DynamicConfigINtNtCskJc15ZtcHlN_21rustc_data_structures9vec_cache8VecCacheNtNtCs58xKICPkfbi_10rustc_span6def_id8CrateNumINtNtNtCs6RMfinxcFgq_12
  62:     0x7ffbbfb0863c - RINvNtNtCsceq9HnlmPNX_18rustc_query_system5query8plumbing17try_execute_queryINtCsgtgSloM9rKF_16rustc_query_impl13DynamicConfigINtNtB4_6caches11SingleCacheINtNtNtCs6RMfinxcFgq_12rustc_middle5query5erase6ErasedAhj0_EEKb0_KB3s_KB3s_ENtNtB1f_8plumbing9QueryCtx
  63:     0x7ffbbfc0533c - rustc_query_impl[bfdc71e5d8a6abb3]::query_system
  64:     0x7ffbbc9aed38 - std[48ebf530629e7536]::sys::backtrace::__rust_begin_short_backtrace::<<std[48ebf530629e7536]::thread::Builder>::spawn_unchecked_<ctrlc[645af98d09b894b2]::set_handler_inner<rustc_driver_impl[c2fafe1ab0c586c7]::install_ctrlc_handler::{closure#0}>::{closure#0}, ()>::{closure#1}::{closure#0}::{closure#0}, ()>
  65:     0x7ffbbc9a8f76 - std[48ebf530629e7536]::sys::backtrace::__rust_begin_short_backtrace::<<std[48ebf530629e7536]::thread::Builder>::spawn_unchecked_<ctrlc[645af98d09b894b2]::set_handler_inner<rustc_driver_impl[c2fafe1ab0c586c7]::install_ctrlc_handler::{closure#0}>::{closure#0}, ()>::{closure#1}::{closure#0}::{closure#0}, ()>
  66:     0x7ffbbc9a417f - RINvNtNtCs6g9X9TJcoew_3std3sys9backtrace28___rust_begin_short_backtraceNCNCINvNtCs3G1pbMWZRnv_15rustc_interface4util26run_in_thread_with_globalsNCINvB1e_31run_in_thread_pool_with_globalsNCINvNtB1g_9interface12run_compileruNCNvCsgJSkwfkFLox_17rustc_driver_i
  67:     0x7ffbbc9b3090 - std[48ebf530629e7536]::sys::backtrace::__rust_begin_short_backtrace::<<std[48ebf530629e7536]::thread::Builder>::spawn_unchecked_<ctrlc[645af98d09b894b2]::set_handler_inner<rustc_driver_impl[c2fafe1ab0c586c7]::install_ctrlc_handler::{closure#0}>::{closure#0}, ()>::{closure#1}::{closure#0}::{closure#0}, ()>
  68:     0x7ffbc008292d - alloc::boxed::impl$28::call_once
                               at /rustc/16d2276fa6fccb0cc239a542d4c3f0eb46f660ec/library\alloc\src\boxed.rs:1966
  69:     0x7ffbc008292d - alloc::boxed::impl$28::call_once
                               at /rustc/16d2276fa6fccb0cc239a542d4c3f0eb46f660ec/library\alloc\src\boxed.rs:1966
  70:     0x7ffbc008292d - std::sys::pal::windows::thread::impl$0::new::thread_start
                               at /rustc/16d2276fa6fccb0cc239a542d4c3f0eb46f660ec/library\std\src\sys\pal\windows\thread.rs:56
  71:     0x7ffc30527374 - BaseThreadInitThunk
  72:     0x7ffc3195cc91 - RtlUserThreadStart

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

note: using internal features is not supported and expected to cause internal compiler errors when used incorrectly

note: please attach the file at `H:\work\my\trash\rust-mini\_users\real_time_fir_iir_filters\rustc-ice-2025-05-26T02_54_20-7012.txt` to your bug report

note: compiler flags: --crate-type lib -C embed-bitcode=no -C debuginfo=2 -C incremental=[REDACTED]

note: some of the compiler flags provided by cargo are hidden

query stack during panic:
#0 [mir_drops_elaborated_and_const_checked] elaborating drops for `filters::iir::third::third_order_butterworth_filter::<impl at src\lib.rs:751:13: 754:108>::make_coeffs::make_coeffs`
#1 [analysis] running analysis passes on this crate
end of query stack

@rustbot label: -E-needs-bisection +S-has-bisection