ICE with `associated_const_equality`

[burrbull]

Trying to remove struct Const<const A: u8> workaround I get this ICE.
stm32-rs/stm32f4xx-hal@2f50fd5

Related to #92827

Note. There is thumbv7em-none-eabihf target used.

Code

I could not get minimal reprodusable example.

<code>

Meta

rustc --version --verbose:

rustc 1.67.1 (d5a82bbd2 2023-02-07)
binary: rustc
commit-hash: d5a82bbd26e1ad8b7401f6a718a9c57c96905483
commit-date: 2023-02-07
host: x86_64-unknown-linux-gnu
release: 1.67.1
LLVM version: 15.0.6

Error output

thread 'rustc' panicked at 'assertion failed: matches!(self.def_kind(ct.def.did), DefKind :: AnonConst)', compiler/rustc_middle/src/mir/interpret/queries.rs:97:25
stack backtrace:
   0:     0x7f1432b6aa5a - std::backtrace_rs::backtrace::libunwind::trace::hf4a48a91b677bc8d
                               at /rustc/9aa5c24b7d763fb98d998819571128ff2eb8a3ca/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7f1432b6aa5a - std::backtrace_rs::backtrace::trace_unsynchronized::h52302266f2c9e2af
                               at /rustc/9aa5c24b7d763fb98d998819571128ff2eb8a3ca/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f1432b6aa5a - std::sys_common::backtrace::_print_fmt::h00aaca457620efb0
                               at /rustc/9aa5c24b7d763fb98d998819571128ff2eb8a3ca/library/std/src/sys_common/backtrace.rs:65:5
   3:     0x7f1432b6aa5a - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h6d9f10455e422cbd
                               at /rustc/9aa5c24b7d763fb98d998819571128ff2eb8a3ca/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f1432bca9ae - core::fmt::write::h065585aa0e682316
                               at /rustc/9aa5c24b7d763fb98d998819571128ff2eb8a3ca/library/core/src/fmt/mod.rs:1232:17
   5:     0x7f1432b5ae05 - std::io::Write::write_fmt::h54937c0abd9a719d
                               at /rustc/9aa5c24b7d763fb98d998819571128ff2eb8a3ca/library/std/src/io/mod.rs:1684:15
   6:     0x7f1432b6a825 - std::sys_common::backtrace::_print::h0141838be2b7fc59
                               at /rustc/9aa5c24b7d763fb98d998819571128ff2eb8a3ca/library/std/src/sys_common/backtrace.rs:47:5
   7:     0x7f1432b6a825 - std::sys_common::backtrace::print::h422705047959e0cf
                               at /rustc/9aa5c24b7d763fb98d998819571128ff2eb8a3ca/library/std/src/sys_common/backtrace.rs:34:9
   8:     0x7f1432b6d59f - std::panicking::default_hook::{{closure}}::h04c227824228bc2c
                               at /rustc/9aa5c24b7d763fb98d998819571128ff2eb8a3ca/library/std/src/panicking.rs:267:22
   9:     0x7f1432b6d2db - std::panicking::default_hook::h1a17cdb165515d8b
                               at /rustc/9aa5c24b7d763fb98d998819571128ff2eb8a3ca/library/std/src/panicking.rs:286:9
  10:     0x7f1435e60224 - rustc_driver_impl[9b756e32c0d38789]::DEFAULT_HOOK::{closure#0}::{closure#0}
  11:     0x7f1432b6dddd - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h7593a5eec671dafe
                               at /rustc/9aa5c24b7d763fb98d998819571128ff2eb8a3ca/library/alloc/src/boxed.rs:2002:9
  12:     0x7f1432b6dddd - std::panicking::rust_panic_with_hook::h815681ed9ae37db1
                               at /rustc/9aa5c24b7d763fb98d998819571128ff2eb8a3ca/library/std/src/panicking.rs:692:13
  13:     0x7f1432b6db12 - std::panicking::begin_panic_handler::{{closure}}::h2a0c3307e4bad14b
                               at /rustc/9aa5c24b7d763fb98d998819571128ff2eb8a3ca/library/std/src/panicking.rs:577:13
  14:     0x7f1432b6aec6 - std::sys_common::backtrace::__rust_end_short_backtrace::hb59a12f53d5a254d
                               at /rustc/9aa5c24b7d763fb98d998819571128ff2eb8a3ca/library/std/src/sys_common/backtrace.rs:137:18
  15:     0x7f1432b6d862 - rust_begin_unwind
                               at /rustc/9aa5c24b7d763fb98d998819571128ff2eb8a3ca/library/std/src/panicking.rs:575:5
  16:     0x7f1432bc7353 - core::panicking::panic_fmt::hd1ca061751c01e2a
                               at /rustc/9aa5c24b7d763fb98d998819571128ff2eb8a3ca/library/core/src/panicking.rs:64:14
  17:     0x7f1432bc73ed - core::panicking::panic::h1c8509257008b514
                               at /rustc/9aa5c24b7d763fb98d998819571128ff2eb8a3ca/library/core/src/panicking.rs:114:5
  18:     0x7f143419946a - <rustc_middle[b5631d71f72482ee]::ty::context::TyCtxt>::const_eval_resolve_for_typeck
  19:     0x7f14341964c1 - <rustc_middle[b5631d71f72482ee]::ty::consts::Const>::eval
  20:     0x7f143416f45e - <rustc_trait_selection[7215420893b05e21]::traits::project::AssocTypeNormalizer as rustc_type_ir[327ad7f49bc4b943]::fold::TypeFolder<rustc_middle[b5631d71f72482ee]::ty::context::TyCtxt>>::fold_const
  21:     0x7f143415f1ed - rustc_trait_selection[7215420893b05e21]::traits::project::opt_normalize_projection_type
  22:     0x7f14346eba15 - <rustc_infer[e7333a217508eb8e]::infer::InferCtxt>::commit_if_ok::<rustc_trait_selection[7215420893b05e21]::traits::project::ProjectAndUnifyResult, rustc_infer[e7333a217508eb8e]::traits::project::MismatchedProjectionTypes, rustc_trait_selection[7215420893b05e21]::traits::project::poly_project_and_unify_type::{closure#0}>
  23:     0x7f1434b3fbeb - <rustc_trait_selection[7215420893b05e21]::traits::select::SelectionContext>::evaluate_predicates_recursively::<alloc[77fdffdb8c1c6cb]::vec::into_iter::IntoIter<rustc_infer[e7333a217508eb8e]::traits::Obligation<rustc_middle[b5631d71f72482ee]::ty::Predicate>>>
  24:     0x7f1434b3c620 - <rustc_infer[e7333a217508eb8e]::infer::InferCtxt>::probe::<core[d0f7fc72c0be1fb4]::result::Result<rustc_middle[b5631d71f72482ee]::traits::select::EvaluationResult, rustc_middle[b5631d71f72482ee]::traits::select::OverflowError>, <rustc_trait_selection[7215420893b05e21]::traits::select::SelectionContext>::evaluation_probe<<rustc_trait_selection[7215420893b05e21]::traits::select::SelectionContext>::evaluate_candidate::{closure#0}::{closure#0}>::{closure#0}>
  25:     0x7f14341733b8 - <alloc[77fdffdb8c1c6cb]::vec::Vec<rustc_trait_selection[7215420893b05e21]::traits::select::EvaluatedCandidate> as alloc[77fdffdb8c1c6cb]::vec::spec_from_iter::SpecFromIter<rustc_trait_selection[7215420893b05e21]::traits::select::EvaluatedCandidate, core[d0f7fc72c0be1fb4]::iter::adapters::GenericShunt<core[d0f7fc72c0be1fb4]::iter::adapters::flatten::FlatMap<core[d0f7fc72c0be1fb4]::iter::adapters::map::Map<alloc[77fdffdb8c1c6cb]::vec::into_iter::IntoIter<rustc_middle[b5631d71f72482ee]::traits::select::SelectionCandidate>, <rustc_trait_selection[7215420893b05e21]::traits::select::SelectionContext>::candidate_from_obligation_no_cache::{closure#0}>, core[d0f7fc72c0be1fb4]::option::Option<core[d0f7fc72c0be1fb4]::result::Result<rustc_trait_selection[7215420893b05e21]::traits::select::EvaluatedCandidate, rustc_middle[b5631d71f72482ee]::traits::SelectionError>>, <core[d0f7fc72c0be1fb4]::result::Result<core[d0f7fc72c0be1fb4]::option::Option<rustc_trait_selection[7215420893b05e21]::traits::select::EvaluatedCandidate>, rustc_middle[b5631d71f72482ee]::traits::SelectionError>>::transpose>, core[d0f7fc72c0be1fb4]::result::Result<core[d0f7fc72c0be1fb4]::convert::Infallible, rustc_middle[b5631d71f72482ee]::traits::SelectionError>>>>::from_iter
  26:     0x7f143414f839 - <rustc_trait_selection[7215420893b05e21]::traits::select::SelectionContext>::candidate_from_obligation_no_cache
  27:     0x7f14340f9d2b - <rustc_trait_selection[7215420893b05e21]::traits::select::SelectionContext>::select
  28:     0x7f14340ef9bb - <rustc_trait_selection[7215420893b05e21]::traits::fulfill::FulfillProcessor as rustc_data_structures[6722e53fadb3415d]::obligation_forest::ObligationProcessor>::process_obligation
  29:     0x7f14340ed26f - <rustc_data_structures[6722e53fadb3415d]::obligation_forest::ObligationForest<rustc_trait_selection[7215420893b05e21]::traits::fulfill::PendingPredicateObligation>>::process_obligations::<rustc_trait_selection[7215420893b05e21]::traits::fulfill::FulfillProcessor>
  30:     0x7f1434914b70 - <rustc_trait_selection[7215420893b05e21]::traits::engine::ObligationCtxt>::select_all_or_error
  31:     0x7f143490cba4 - rustc_hir_analysis[90a2d534158d44df]::check::wfcheck::check_well_formed
  32:     0x7f14345ad783 - <rustc_query_system[2b3be6912aef78d5]::dep_graph::graph::DepGraph<rustc_middle[b5631d71f72482ee]::dep_graph::dep_node::DepKind>>::with_task::<rustc_query_impl[a3402ef8368c6710]::plumbing::QueryCtxt, rustc_hir[c7d6b754e828c199]::hir_id::OwnerId, ()>
  33:     0x7f14345ac8aa - rustc_query_system[2b3be6912aef78d5]::query::plumbing::get_query::<rustc_query_impl[a3402ef8368c6710]::queries::check_well_formed, rustc_query_impl[a3402ef8368c6710]::plumbing::QueryCtxt, rustc_middle[b5631d71f72482ee]::dep_graph::dep_node::DepKind>
  34:     0x7f1435227ba6 - rustc_data_structures[6722e53fadb3415d]::sync::par_for_each_in::<&[rustc_hir[c7d6b754e828c199]::hir::ItemId], <rustc_middle[b5631d71f72482ee]::hir::ModuleItems>::par_items<rustc_hir_analysis[90a2d534158d44df]::check::wfcheck::check_mod_type_wf::{closure#0}>::{closure#0}>
  35:     0x7f1435227860 - rustc_hir_analysis[90a2d534158d44df]::check::wfcheck::check_mod_type_wf
  36:     0x7f143479ba63 - <rustc_query_system[2b3be6912aef78d5]::dep_graph::graph::DepGraph<rustc_middle[b5631d71f72482ee]::dep_graph::dep_node::DepKind>>::with_task::<rustc_query_impl[a3402ef8368c6710]::plumbing::QueryCtxt, rustc_span[65551fbbac8b0f76]::def_id::LocalDefId, ()>
  37:     0x7f14354199c9 - rustc_query_system[2b3be6912aef78d5]::query::plumbing::try_execute_query::<rustc_query_impl[a3402ef8368c6710]::queries::check_mod_type_wf, rustc_query_impl[a3402ef8368c6710]::plumbing::QueryCtxt>
  38:     0x7f14354192fd - <rustc_query_impl[a3402ef8368c6710]::Queries as rustc_middle[b5631d71f72482ee]::ty::query::QueryEngine>::check_mod_type_wf
  39:     0x7f1435170224 - std[92d2792449a90a80]::panicking::try::<(), core[d0f7fc72c0be1fb4]::panic::unwind_safe::AssertUnwindSafe<rustc_data_structures[6722e53fadb3415d]::sync::par_for_each_in<&[rustc_hir[c7d6b754e828c199]::hir_id::OwnerId], <rustc_middle[b5631d71f72482ee]::hir::map::Map>::par_for_each_module<rustc_hir_analysis[90a2d534158d44df]::check_crate::{closure#5}::{closure#0}::{closure#0}>::{closure#0}>::{closure#0}::{closure#0}>>
  40:     0x7f14343080f8 - rustc_data_structures[6722e53fadb3415d]::sync::par_for_each_in::<&[rustc_hir[c7d6b754e828c199]::hir_id::OwnerId], <rustc_middle[b5631d71f72482ee]::hir::map::Map>::par_for_each_module<rustc_hir_analysis[90a2d534158d44df]::check_crate::{closure#5}::{closure#0}::{closure#0}>::{closure#0}>
  41:     0x7f1434307f80 - <rustc_session[1c603fdce436292a]::session::Session>::track_errors::<rustc_hir_analysis[90a2d534158d44df]::check_crate::{closure#5}, ()>
  42:     0x7f1434305258 - rustc_hir_analysis[90a2d534158d44df]::check_crate
  43:     0x7f14342fad72 - rustc_interface[828b714f964ce1da]::passes::analysis
  44:     0x7f143564e061 - <rustc_query_system[2b3be6912aef78d5]::dep_graph::graph::DepGraph<rustc_middle[b5631d71f72482ee]::dep_graph::dep_node::DepKind>>::with_task::<rustc_query_impl[a3402ef8368c6710]::plumbing::QueryCtxt, (), core[d0f7fc72c0be1fb4]::result::Result<(), rustc_errors[c2c7aee1e156d1f6]::ErrorGuaranteed>>
  45:     0x7f143564d6d2 - rustc_query_system[2b3be6912aef78d5]::query::plumbing::try_execute_query::<rustc_query_impl[a3402ef8368c6710]::queries::analysis, rustc_query_impl[a3402ef8368c6710]::plumbing::QueryCtxt>
  46:     0x7f14358550fa - <rustc_query_impl[a3402ef8368c6710]::Queries as rustc_middle[b5631d71f72482ee]::ty::query::QueryEngine>::analysis
  47:     0x7f1435075a23 - <rustc_interface[828b714f964ce1da]::queries::QueryResult<&rustc_middle[b5631d71f72482ee]::ty::context::GlobalCtxt>>::enter::<core[d0f7fc72c0be1fb4]::result::Result<(), rustc_errors[c2c7aee1e156d1f6]::ErrorGuaranteed>, rustc_driver_impl[9b756e32c0d38789]::run_compiler::{closure#1}::{closure#2}::{closure#3}>
  48:     0x7f1435074bf4 - <rustc_interface[828b714f964ce1da]::interface::Compiler>::enter::<rustc_driver_impl[9b756e32c0d38789]::run_compiler::{closure#1}::{closure#2}, core[d0f7fc72c0be1fb4]::result::Result<core[d0f7fc72c0be1fb4]::option::Option<rustc_interface[828b714f964ce1da]::queries::Linker>, rustc_errors[c2c7aee1e156d1f6]::ErrorGuaranteed>>
  49:     0x7f143506fe14 - rustc_span[65551fbbac8b0f76]::with_source_map::<core[d0f7fc72c0be1fb4]::result::Result<(), rustc_errors[c2c7aee1e156d1f6]::ErrorGuaranteed>, rustc_interface[828b714f964ce1da]::interface::run_compiler<core[d0f7fc72c0be1fb4]::result::Result<(), rustc_errors[c2c7aee1e156d1f6]::ErrorGuaranteed>, rustc_driver_impl[9b756e32c0d38789]::run_compiler::{closure#1}>::{closure#0}::{closure#0}>
  50:     0x7f143506f924 - <scoped_tls[18b6b4dd1216e2e8]::ScopedKey<rustc_span[65551fbbac8b0f76]::SessionGlobals>>::set::<rustc_interface[828b714f964ce1da]::interface::run_compiler<core[d0f7fc72c0be1fb4]::result::Result<(), rustc_errors[c2c7aee1e156d1f6]::ErrorGuaranteed>, rustc_driver_impl[9b756e32c0d38789]::run_compiler::{closure#1}>::{closure#0}, core[d0f7fc72c0be1fb4]::result::Result<(), rustc_errors[c2c7aee1e156d1f6]::ErrorGuaranteed>>
  51:     0x7f143506f022 - std[92d2792449a90a80]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[828b714f964ce1da]::util::run_in_thread_pool_with_globals<rustc_interface[828b714f964ce1da]::interface::run_compiler<core[d0f7fc72c0be1fb4]::result::Result<(), rustc_errors[c2c7aee1e156d1f6]::ErrorGuaranteed>, rustc_driver_impl[9b756e32c0d38789]::run_compiler::{closure#1}>::{closure#0}, core[d0f7fc72c0be1fb4]::result::Result<(), rustc_errors[c2c7aee1e156d1f6]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[d0f7fc72c0be1fb4]::result::Result<(), rustc_errors[c2c7aee1e156d1f6]::ErrorGuaranteed>>
  52:     0x7f143506edcc - <<std[92d2792449a90a80]::thread::Builder>::spawn_unchecked_<rustc_interface[828b714f964ce1da]::util::run_in_thread_pool_with_globals<rustc_interface[828b714f964ce1da]::interface::run_compiler<core[d0f7fc72c0be1fb4]::result::Result<(), rustc_errors[c2c7aee1e156d1f6]::ErrorGuaranteed>, rustc_driver_impl[9b756e32c0d38789]::run_compiler::{closure#1}>::{closure#0}, core[d0f7fc72c0be1fb4]::result::Result<(), rustc_errors[c2c7aee1e156d1f6]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[d0f7fc72c0be1fb4]::result::Result<(), rustc_errors[c2c7aee1e156d1f6]::ErrorGuaranteed>>::{closure#1} as core[d0f7fc72c0be1fb4]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  53:     0x7f1432b77c63 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h24b1cedbd344db9f
                               at /rustc/9aa5c24b7d763fb98d998819571128ff2eb8a3ca/library/alloc/src/boxed.rs:1988:9
  54:     0x7f1432b77c63 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hb7ac28b0dfacf269
                               at /rustc/9aa5c24b7d763fb98d998819571128ff2eb8a3ca/library/alloc/src/boxed.rs:1988:9
  55:     0x7f1432b77c63 - std::sys::unix::thread::Thread::new::thread_start::h67c8d237baa6ad51
                               at /rustc/9aa5c24b7d763fb98d998819571128ff2eb8a3ca/library/std/src/sys/unix/thread.rs:108:17
  56:     0x7f1432894b43 - start_thread
                               at ./nptl/./nptl/pthread_create.c:442:8
  57:     0x7f1432926a00 - clone3
                               at ./misc/../sysdeps/unix/sysv/linux/x86_64/clone3.S:81
  58:                0x0 - <unknown>

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

Backtrace

thread 'rustc' panicked at 'assertion failed: matches!(self.def_kind(ct.def.did), DefKind :: AnonConst)', compiler/rustc_middle/src/mir/interpret/queries.rs:97:25
stack backtrace:
   0: rust_begin_unwind
             at /rustc/9aa5c24b7d763fb98d998819571128ff2eb8a3ca/library/std/src/panicking.rs:575:5
   1: core::panicking::panic_fmt
             at /rustc/9aa5c24b7d763fb98d998819571128ff2eb8a3ca/library/core/src/panicking.rs:64:14
   2: core::panicking::panic
             at /rustc/9aa5c24b7d763fb98d998819571128ff2eb8a3ca/library/core/src/panicking.rs:114:5
   3: <rustc_middle::ty::context::TyCtxt>::const_eval_resolve_for_typeck
   4: <rustc_middle::ty::consts::Const>::eval
   5: <rustc_trait_selection::traits::project::AssocTypeNormalizer as rustc_type_ir::fold::TypeFolder<rustc_middle::ty::context::TyCtxt>>::fold_const
   6: rustc_trait_selection::traits::project::opt_normalize_projection_type
   7: <rustc_infer::infer::InferCtxt>::commit_if_ok::<rustc_trait_selection::traits::project::ProjectAndUnifyResult, rustc_infer::traits::project::MismatchedProjectionTypes, rustc_trait_selection::traits::project::poly_project_and_unify_type::{closure#0}>
   8: <rustc_trait_selection::traits::select::SelectionContext>::evaluate_predicates_recursively::<alloc::vec::into_iter::IntoIter<rustc_infer::traits::Obligation<rustc_middle::ty::Predicate>>>
   9: <rustc_infer::infer::InferCtxt>::probe::<core::result::Result<rustc_middle::traits::select::EvaluationResult, rustc_middle::traits::select::OverflowError>, <rustc_trait_selection::traits::select::SelectionContext>::evaluation_probe<<rustc_trait_selection::traits::select::SelectionContext>::evaluate_candidate::{closure#0}::{closure#0}>::{closure#0}>
  10: <alloc::vec::Vec<rustc_trait_selection::traits::select::EvaluatedCandidate> as alloc::vec::spec_from_iter::SpecFromIter<rustc_trait_selection::traits::select::EvaluatedCandidate, core::iter::adapters::GenericShunt<core::iter::adapters::flatten::FlatMap<core::iter::adapters::map::Map<alloc::vec::into_iter::IntoIter<rustc_middle::traits::select::SelectionCandidate>, <rustc_trait_selection::traits::select::SelectionContext>::candidate_from_obligation_no_cache::{closure#0}>, core::option::Option<core::result::Result<rustc_trait_selection::traits::select::EvaluatedCandidate, rustc_middle::traits::SelectionError>>, <core::result::Result<core::option::Option<rustc_trait_selection::traits::select::EvaluatedCandidate>, rustc_middle::traits::SelectionError>>::transpose>, core::result::Result<core::convert::Infallible, rustc_middle::traits::SelectionError>>>>::from_iter
  11: <rustc_trait_selection::traits::select::SelectionContext>::candidate_from_obligation_no_cache
  12: <rustc_trait_selection::traits::select::SelectionContext>::select
  13: <rustc_trait_selection::traits::fulfill::FulfillProcessor as rustc_data_structures::obligation_forest::ObligationProcessor>::process_obligation
  14: <rustc_data_structures::obligation_forest::ObligationForest<rustc_trait_selection::traits::fulfill::PendingPredicateObligation>>::process_obligations::<rustc_trait_selection::traits::fulfill::FulfillProcessor>
  15: <rustc_trait_selection::traits::engine::ObligationCtxt>::select_all_or_error
  16: rustc_hir_analysis::check::wfcheck::check_well_formed
  17: <rustc_query_system::dep_graph::graph::DepGraph<rustc_middle::dep_graph::dep_node::DepKind>>::with_task::<rustc_query_impl::plumbing::QueryCtxt, rustc_hir::hir_id::OwnerId, ()>
  18: rustc_query_system::query::plumbing::get_query::<rustc_query_impl::queries::check_well_formed, rustc_query_impl::plumbing::QueryCtxt, rustc_middle::dep_graph::dep_node::DepKind>
  19: rustc_data_structures::sync::par_for_each_in::<&[rustc_hir::hir::ItemId], <rustc_middle::hir::ModuleItems>::par_items<rustc_hir_analysis::check::wfcheck::check_mod_type_wf::{closure#0}>::{closure#0}>
  20: rustc_hir_analysis::check::wfcheck::check_mod_type_wf
  21: <rustc_query_system::dep_graph::graph::DepGraph<rustc_middle::dep_graph::dep_node::DepKind>>::with_task::<rustc_query_impl::plumbing::QueryCtxt, rustc_span::def_id::LocalDefId, ()>
  22: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::queries::check_mod_type_wf, rustc_query_impl::plumbing::QueryCtxt>
  23: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::check_mod_type_wf
  24: std::panicking::try::<(), core::panic::unwind_safe::AssertUnwindSafe<rustc_data_structures::sync::par_for_each_in<&[rustc_hir::hir_id::OwnerId], <rustc_middle::hir::map::Map>::par_for_each_module<rustc_hir_analysis::check_crate::{closure#5}::{closure#0}::{closure#0}>::{closure#0}>::{closure#0}::{closure#0}>>
  25: rustc_data_structures::sync::par_for_each_in::<&[rustc_hir::hir_id::OwnerId], <rustc_middle::hir::map::Map>::par_for_each_module<rustc_hir_analysis::check_crate::{closure#5}::{closure#0}::{closure#0}>::{closure#0}>
  26: <rustc_session::session::Session>::track_errors::<rustc_hir_analysis::check_crate::{closure#5}, ()>
  27: rustc_hir_analysis::check_crate
  28: rustc_interface::passes::analysis
  29: <rustc_query_system::dep_graph::graph::DepGraph<rustc_middle::dep_graph::dep_node::DepKind>>::with_task::<rustc_query_impl::plumbing::QueryCtxt, (), core::result::Result<(), rustc_errors::ErrorGuaranteed>>
  30: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::queries::analysis, rustc_query_impl::plumbing::QueryCtxt>
  31: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::analysis
  32: <rustc_interface::queries::QueryResult<&rustc_middle::ty::context::GlobalCtxt>>::enter::<core::result::Result<(), rustc_errors::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}::{closure#2}::{closure#3}>
  33: <rustc_interface::interface::Compiler>::enter::<rustc_driver_impl::run_compiler::{closure#1}::{closure#2}, core::result::Result<core::option::Option<rustc_interface::queries::Linker>, rustc_errors::ErrorGuaranteed>>
  34: rustc_span::with_source_map::<core::result::Result<(), rustc_errors::ErrorGuaranteed>, rustc_interface::interface::run_compiler<core::result::Result<(), rustc_errors::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}::{closure#0}>
  35: <scoped_tls::ScopedKey<rustc_span::SessionGlobals>>::set::<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_errors::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_errors::ErrorGuaranteed>>
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

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

[bwmf2]

Minimal example:

#![feature(associated_const_equality)]
#![no_std]

use core::marker::PhantomData;

pub struct NoPin;

pub trait SetAlternate<const A: u8> {}

impl SetAlternate<0> for NoPin {}

pub trait PinA<PER> {
    const A: u8;
}

impl<PER> PinA<PER> for NoPin {
    const A: u8 = 0;
}

pub trait Pins<USART> {}

impl<USART, T, const TA: u8> Pins<USART> for T where
    T: PinA<USART, A = { TA }> + SetAlternate<TA>
{
}

struct Serial<USART>(PhantomData<USART>);

impl<USART> Serial<USART> where NoPin: Pins<USART> {}

Error output

$ cargo +stable build
   Compiling mcve v0.1.0 (/tmp/mcve)
error[E0554]: `#![feature]` may not be used on the stable release channel
 --> src/lib.rs:1:1
  |
1 | #![feature(associated_const_equality)]
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

thread 'rustc' panicked at 'assertion failed: matches!(self.def_kind(ct.def.did), DefKind :: AnonConst)', compiler/rustc_middle/src/mir/interpret/queries.rs:97:25
stack backtrace:
   0:     0x7f0bb93886fa - std::backtrace_rs::backtrace::libunwind::trace::h79937bc171ada62c
                               at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7f0bb93886fa - std::backtrace_rs::backtrace::trace_unsynchronized::h2292bca8571cb919
                               at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f0bb93886fa - std::sys_common::backtrace::_print_fmt::h9c461f248e4ae90d
                               at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/std/src/sys_common/backtrace.rs:65:5
   3:     0x7f0bb93886fa - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::he9fe6bf1a39182e1
                               at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f0bb93eb25e - core::fmt::write::h032658c119c720d7
                               at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/core/src/fmt/mod.rs:1208:17
   5:     0x7f0bb9378a85 - std::io::Write::write_fmt::h299fc90dfae41c0d
                               at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/std/src/io/mod.rs:1682:15
   6:     0x7f0bb93884c5 - std::sys_common::backtrace::_print::heb70d25df9937e3f
                               at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/std/src/sys_common/backtrace.rs:47:5
   7:     0x7f0bb93884c5 - std::sys_common::backtrace::print::had745c0a76b8b521
                               at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/std/src/sys_common/backtrace.rs:34:9
   8:     0x7f0bb938b20f - std::panicking::default_hook::{{closure}}::h1ea782cdfa2fd097
                               at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/std/src/panicking.rs:267:22
   9:     0x7f0bb938af4b - std::panicking::default_hook::h1cc3af63455a163c
                               at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/std/src/panicking.rs:286:9
  10:     0x7f0bbc683ab1 - <rustc_driver[5c3b90d1fb3964ba]::DEFAULT_HOOK::{closure#0}::{closure#0} as core[e6a29f2585b3d454]::ops::function::FnOnce<(&core[e6a29f2585b3d454]::panic::panic_info::PanicInfo,)>>::call_once::{shim:vtable#0}
  11:     0x7f0bb938ba4d - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h6e4950ba7c0fd82a
                               at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/alloc/src/boxed.rs:2032:9
  12:     0x7f0bb938ba4d - std::panicking::rust_panic_with_hook::h5cafdc4b3bfd5528
                               at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/std/src/panicking.rs:692:13
  13:     0x7f0bb938b782 - std::panicking::begin_panic_handler::{{closure}}::hf31c60f40775892c
                               at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/std/src/panicking.rs:577:13
  14:     0x7f0bb9388bac - std::sys_common::backtrace::__rust_end_short_backtrace::h28a5c7be595826cd
                               at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/std/src/sys_common/backtrace.rs:137:18
  15:     0x7f0bb938b4d2 - rust_begin_unwind
                               at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/std/src/panicking.rs:575:5
  16:     0x7f0bb93e7c43 - core::panicking::panic_fmt::h8fa27a0b37dd98b7
                               at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/core/src/panicking.rs:64:14
  17:     0x7f0bb93e7d1d - core::panicking::panic::h545818946343732b
                               at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/core/src/panicking.rs:111:5
  18:     0x7f0bbad5f549 - <rustc_middle[83f907612b22699d]::ty::context::TyCtxt>::const_eval_resolve_for_typeck
  19:     0x7f0bbad5eb51 - <rustc_middle[83f907612b22699d]::ty::consts::Const>::eval
  20:     0x7f0bbad5ac02 - <rustc_trait_selection[945b70100f8dd3ec]::traits::project::AssocTypeNormalizer as rustc_middle[83f907612b22699d]::ty::fold::TypeFolder>::fold_const
  21:     0x7f0bbad4c81d - rustc_trait_selection[945b70100f8dd3ec]::traits::project::opt_normalize_projection_type
  22:     0x7f0bbae29b48 - <rustc_infer[ce51c2dc4d9f2303]::infer::InferCtxt>::commit_if_ok::<rustc_trait_selection[945b70100f8dd3ec]::traits::project::ProjectAndUnifyResult, rustc_infer[ce51c2dc4d9f2303]::traits::project::MismatchedProjectionTypes, rustc_trait_selection[945b70100f8dd3ec]::traits::project::poly_project_and_unify_type::{closure#0}>
  23:     0x7f0bbaf6104d - <rustc_trait_selection[945b70100f8dd3ec]::traits::select::SelectionContext>::evaluate_predicates_recursively::<alloc[89959c1738bdde42]::vec::into_iter::IntoIter<rustc_infer[ce51c2dc4d9f2303]::traits::Obligation<rustc_middle[83f907612b22699d]::ty::Predicate>>>
  24:     0x7f0bbaf5ed51 - <rustc_infer[ce51c2dc4d9f2303]::infer::InferCtxt>::probe::<core[e6a29f2585b3d454]::result::Result<rustc_middle[83f907612b22699d]::traits::select::EvaluationResult, rustc_middle[83f907612b22699d]::traits::select::OverflowError>, <rustc_trait_selection[945b70100f8dd3ec]::traits::select::SelectionContext>::evaluation_probe<<rustc_trait_selection[945b70100f8dd3ec]::traits::select::SelectionContext>::evaluate_candidate::{closure#0}::{closure#0}>::{closure#0}>
  25:     0x7f0bbaf7c47e - <alloc[89959c1738bdde42]::vec::Vec<rustc_trait_selection[945b70100f8dd3ec]::traits::select::EvaluatedCandidate> as alloc[89959c1738bdde42]::vec::spec_from_iter::SpecFromIter<rustc_trait_selection[945b70100f8dd3ec]::traits::select::EvaluatedCandidate, core[e6a29f2585b3d454]::iter::adapters::GenericShunt<core[e6a29f2585b3d454]::iter::adapters::flatten::FlatMap<core[e6a29f2585b3d454]::iter::adapters::map::Map<alloc[89959c1738bdde42]::vec::into_iter::IntoIter<rustc_middle[83f907612b22699d]::traits::select::SelectionCandidate>, <rustc_trait_selection[945b70100f8dd3ec]::traits::select::SelectionContext>::candidate_from_obligation_no_cache::{closure#0}>, core[e6a29f2585b3d454]::option::Option<core[e6a29f2585b3d454]::result::Result<rustc_trait_selection[945b70100f8dd3ec]::traits::select::EvaluatedCandidate, rustc_middle[83f907612b22699d]::traits::SelectionError>>, <core[e6a29f2585b3d454]::result::Result<core[e6a29f2585b3d454]::option::Option<rustc_trait_selection[945b70100f8dd3ec]::traits::select::EvaluatedCandidate>, rustc_middle[83f907612b22699d]::traits::SelectionError>>::transpose>, core[e6a29f2585b3d454]::result::Result<core[e6a29f2585b3d454]::convert::Infallible, rustc_middle[83f907612b22699d]::traits::SelectionError>>>>::from_iter
  26:     0x7f0bbaf79850 - <rustc_trait_selection[945b70100f8dd3ec]::traits::select::SelectionContext>::candidate_from_obligation_no_cache
  27:     0x7f0bba8ddbdb - <rustc_trait_selection[945b70100f8dd3ec]::traits::select::SelectionContext>::select
  28:     0x7f0bba8cd091 - <rustc_trait_selection[945b70100f8dd3ec]::traits::fulfill::FulfillProcessor as rustc_data_structures[1026114362f98086]::obligation_forest::ObligationProcessor>::process_obligation
  29:     0x7f0bba8ca7a2 - <rustc_data_structures[1026114362f98086]::obligation_forest::ObligationForest<rustc_trait_selection[945b70100f8dd3ec]::traits::fulfill::PendingPredicateObligation>>::process_obligations::<rustc_trait_selection[945b70100f8dd3ec]::traits::fulfill::FulfillProcessor>
  30:     0x7f0bbb16aafb - <rustc_trait_selection[945b70100f8dd3ec]::traits::engine::ObligationCtxt>::select_all_or_error
  31:     0x7f0bbb6a50dd - rustc_hir_analysis[44326659f1d3f01d]::check::wfcheck::check_well_formed
  32:     0x7f0bba88328c - <rustc_query_system[7dbbccfee5a2d054]::dep_graph::graph::DepGraph<rustc_middle[83f907612b22699d]::dep_graph::dep_node::DepKind>>::with_task::<rustc_middle[83f907612b22699d]::ty::context::TyCtxt, rustc_hir[dd085327af2d6b95]::hir_id::OwnerId, ()>
  33:     0x7f0bba881ce0 - rustc_query_system[7dbbccfee5a2d054]::query::plumbing::get_query::<rustc_query_impl[e214cefb6de2a99d]::queries::check_well_formed, rustc_query_impl[e214cefb6de2a99d]::plumbing::QueryCtxt>
  34:     0x7f0bbba55608 - rustc_data_structures[1026114362f98086]::sync::par_for_each_in::<&[rustc_hir[dd085327af2d6b95]::hir::ImplItemId], <rustc_middle[83f907612b22699d]::hir::ModuleItems>::par_impl_items<rustc_hir_analysis[44326659f1d3f01d]::check::wfcheck::check_mod_type_wf::{closure#1}>::{closure#0}>
  35:     0x7f0bbba55417 - rustc_hir_analysis[44326659f1d3f01d]::check::wfcheck::check_mod_type_wf
  36:     0x7f0bbb22b77c - <rustc_query_system[7dbbccfee5a2d054]::dep_graph::graph::DepGraph<rustc_middle[83f907612b22699d]::dep_graph::dep_node::DepKind>>::with_task::<rustc_middle[83f907612b22699d]::ty::context::TyCtxt, rustc_span[41a321a6411ba4fa]::def_id::LocalDefId, ()>
  37:     0x7f0bbb22968e - rustc_query_system[7dbbccfee5a2d054]::query::plumbing::try_execute_query::<rustc_query_impl[e214cefb6de2a99d]::plumbing::QueryCtxt, rustc_query_system[7dbbccfee5a2d054]::query::caches::VecCache<rustc_span[41a321a6411ba4fa]::def_id::LocalDefId, ()>>
  38:     0x7f0bbba25ce3 - rustc_query_system[7dbbccfee5a2d054]::query::plumbing::get_query::<rustc_query_impl[e214cefb6de2a99d]::queries::check_mod_type_wf, rustc_query_impl[e214cefb6de2a99d]::plumbing::QueryCtxt>
  39:     0x7f0bbab7e5e8 - rustc_data_structures[1026114362f98086]::sync::par_for_each_in::<&[rustc_hir[dd085327af2d6b95]::hir_id::OwnerId], <rustc_middle[83f907612b22699d]::hir::map::Map>::par_for_each_module<rustc_hir_analysis[44326659f1d3f01d]::check_crate::{closure#5}::{closure#0}::{closure#0}>::{closure#0}>
  40:     0x7f0bbab7e3d3 - <rustc_session[b89b9f24749004e7]::session::Session>::track_errors::<rustc_hir_analysis[44326659f1d3f01d]::check_crate::{closure#5}, ()>
  41:     0x7f0bbab7dced - rustc_hir_analysis[44326659f1d3f01d]::check_crate
  42:     0x7f0bbab7d98b - rustc_interface[65dcc5dffb099e04]::passes::analysis
  43:     0x7f0bbbe3591f - <rustc_query_system[7dbbccfee5a2d054]::dep_graph::graph::DepGraph<rustc_middle[83f907612b22699d]::dep_graph::dep_node::DepKind>>::with_task::<rustc_middle[83f907612b22699d]::ty::context::TyCtxt, (), core[e6a29f2585b3d454]::result::Result<(), rustc_errors[d24ea2395205e4f0]::ErrorGuaranteed>>
  44:     0x7f0bbbe34a17 - rustc_query_system[7dbbccfee5a2d054]::query::plumbing::try_execute_query::<rustc_query_impl[e214cefb6de2a99d]::plumbing::QueryCtxt, rustc_query_system[7dbbccfee5a2d054]::query::caches::DefaultCache<(), core[e6a29f2585b3d454]::result::Result<(), rustc_errors[d24ea2395205e4f0]::ErrorGuaranteed>>>
  45:     0x7f0bbbe34470 - rustc_query_system[7dbbccfee5a2d054]::query::plumbing::get_query::<rustc_query_impl[e214cefb6de2a99d]::queries::analysis, rustc_query_impl[e214cefb6de2a99d]::plumbing::QueryCtxt>
  46:     0x7f0bbb8471b3 - <rustc_interface[65dcc5dffb099e04]::passes::QueryContext>::enter::<rustc_driver[5c3b90d1fb3964ba]::run_compiler::{closure#1}::{closure#2}::{closure#2}, core[e6a29f2585b3d454]::result::Result<(), rustc_errors[d24ea2395205e4f0]::ErrorGuaranteed>>
  47:     0x7f0bbb843733 - <rustc_interface[65dcc5dffb099e04]::interface::Compiler>::enter::<rustc_driver[5c3b90d1fb3964ba]::run_compiler::{closure#1}::{closure#2}, core[e6a29f2585b3d454]::result::Result<core[e6a29f2585b3d454]::option::Option<rustc_interface[65dcc5dffb099e04]::queries::Linker>, rustc_errors[d24ea2395205e4f0]::ErrorGuaranteed>>
  48:     0x7f0bbb83e788 - rustc_span[41a321a6411ba4fa]::with_source_map::<core[e6a29f2585b3d454]::result::Result<(), rustc_errors[d24ea2395205e4f0]::ErrorGuaranteed>, rustc_interface[65dcc5dffb099e04]::interface::run_compiler<core[e6a29f2585b3d454]::result::Result<(), rustc_errors[d24ea2395205e4f0]::ErrorGuaranteed>, rustc_driver[5c3b90d1fb3964ba]::run_compiler::{closure#1}>::{closure#0}::{closure#0}>
  49:     0x7f0bbb83e275 - <scoped_tls[393dd8f8fd825c8d]::ScopedKey<rustc_span[41a321a6411ba4fa]::SessionGlobals>>::set::<rustc_interface[65dcc5dffb099e04]::interface::run_compiler<core[e6a29f2585b3d454]::result::Result<(), rustc_errors[d24ea2395205e4f0]::ErrorGuaranteed>, rustc_driver[5c3b90d1fb3964ba]::run_compiler::{closure#1}>::{closure#0}, core[e6a29f2585b3d454]::result::Result<(), rustc_errors[d24ea2395205e4f0]::ErrorGuaranteed>>
  50:     0x7f0bbb83d862 - std[359ab902947f5f0b]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[65dcc5dffb099e04]::util::run_in_thread_pool_with_globals<rustc_interface[65dcc5dffb099e04]::interface::run_compiler<core[e6a29f2585b3d454]::result::Result<(), rustc_errors[d24ea2395205e4f0]::ErrorGuaranteed>, rustc_driver[5c3b90d1fb3964ba]::run_compiler::{closure#1}>::{closure#0}, core[e6a29f2585b3d454]::result::Result<(), rustc_errors[d24ea2395205e4f0]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[e6a29f2585b3d454]::result::Result<(), rustc_errors[d24ea2395205e4f0]::ErrorGuaranteed>>
  51:     0x7f0bbbf36b7a - <<std[359ab902947f5f0b]::thread::Builder>::spawn_unchecked_<rustc_interface[65dcc5dffb099e04]::util::run_in_thread_pool_with_globals<rustc_interface[65dcc5dffb099e04]::interface::run_compiler<core[e6a29f2585b3d454]::result::Result<(), rustc_errors[d24ea2395205e4f0]::ErrorGuaranteed>, rustc_driver[5c3b90d1fb3964ba]::run_compiler::{closure#1}>::{closure#0}, core[e6a29f2585b3d454]::result::Result<(), rustc_errors[d24ea2395205e4f0]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[e6a29f2585b3d454]::result::Result<(), rustc_errors[d24ea2395205e4f0]::ErrorGuaranteed>>::{closure#1} as core[e6a29f2585b3d454]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  52:     0x7f0bb9395803 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hb77d8d72ebcf79c4
                               at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/alloc/src/boxed.rs:2000:9
  53:     0x7f0bb9395803 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hc08c3353e1568487
                               at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/alloc/src/boxed.rs:2000:9
  54:     0x7f0bb9395803 - std::sys::unix::thread::Thread::new::thread_start::h7168e596cd5e5ce6
                               at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/std/src/sys/unix/thread.rs:108:17
  55:     0x7f0bb90ffbb5 - <unknown>
  56:     0x7f0bb9181d90 - <unknown>
  57:                0x0 - <unknown>

error: internal compiler error: unexpected panic

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

note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md

note: rustc 1.67.1 (d5a82bbd2 2023-02-07) running on x86_64-unknown-linux-gnu

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

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

query stack during panic:
#0 [check_well_formed] checking that `<impl at src/lib.rs:29:1: 29:26>` is well-formed
#1 [check_mod_type_wf] checking that types are well-formed in top-level module
#2 [analysis] running analysis passes on this crate
end of query stack
For more information about this error, try `rustc --explain E0554`.
error: could not compile `mcve` due to previous error
$

[matthiaskrgr]

Seems that this no longer crashes as is

[matthiaskrgr]

reopened until test is added