ICE Unevaluated ty::Const in MIR body

[matthiaskrgr]

auto-reduced (treereduce-rust):

#![feature(with_negative_coherence)]
#![feature(generic_const_exprs)]
#![crate_type = "lib"]
trait Trait {}
struct A<const B: bool>;

trait C {}

impl<const D: u32> Trait for E<D> where A<{ D <= 2 }>: FnOnce(&isize) {}
struct E<const D: u32>;

impl<const D: u32> Trait for E<D> where A<{ D <= 2 }>: C {}

original:

//@ check-pass

// Regression test for #133639.

#![feature(with_negative_coherence)]
#![feature(min_specialization)]
#![feature(generic_const_exprs)]
//~^ WARNING the feature `generic_const_exprs` is incomplete

#![crate_type = "lib"]
trait Trait {}
struct A<const B: bool>;

trait C {}

impl<const D: u32> Trait for E<D> where A<{ D <= 2 }>: FnOnce(&isize) {}
struct E<const D: u32>;

impl<const D: u32> Trait for E<D> where A<{ D <= 2 }>: C {}

Version information

rustc 1.88.0-nightly (2ad5f8607 2025-05-03)
binary: rustc
commit-hash: 2ad5f8607d0e192b60b130e5cc416b477b351c18
commit-date: 2025-05-03
host: x86_64-unknown-linux-gnu
release: 1.88.0-nightly
LLVM version: 20.1.2

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

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.hvdqwvRU9JOq/rustc_testrunner_tmpdir_reporting.7eBYeK5qMuy7/mvce.rs:2:12
  |
2 | #![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

warning: trait `Trait` is never used
 --> /tmp/icemaker_global_tempdir.hvdqwvRU9JOq/rustc_testrunner_tmpdir_reporting.7eBYeK5qMuy7/mvce.rs:4:7
  |
4 | trait Trait {}
  |       ^^^^^
  |
  = note: `#[warn(dead_code)]` on by default

warning: struct `A` is never constructed
 --> /tmp/icemaker_global_tempdir.hvdqwvRU9JOq/rustc_testrunner_tmpdir_reporting.7eBYeK5qMuy7/mvce.rs:5:8
  |
5 | struct A<const B: bool>;
  |        ^

warning: trait `C` is never used
 --> /tmp/icemaker_global_tempdir.hvdqwvRU9JOq/rustc_testrunner_tmpdir_reporting.7eBYeK5qMuy7/mvce.rs:7:7
  |
7 | trait C {}
  |       ^

warning: struct `E` is never constructed
  --> /tmp/icemaker_global_tempdir.hvdqwvRU9JOq/rustc_testrunner_tmpdir_reporting.7eBYeK5qMuy7/mvce.rs:10:8
   |
10 | struct E<const D: u32>;
   |        ^

warning: 5 warnings 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: Unevaluated `ty::Const` in MIR body
  |
  = note: delayed at /rustc/2ad5f8607d0e192b60b130e5cc416b477b351c18/compiler/rustc_middle/src/mir/consts.rs:358:35
             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::<&str>
             4: <rustc_const_eval::interpret::eval_context::InterpCx<rustc_const_eval::const_eval::machine::CompileTimeMachine>>::push_stack_frame_raw
             5: rustc_const_eval::const_eval::eval_queries::eval_to_allocation_raw_provider
             6: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::eval_to_allocation_raw::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 24]>>
             7: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::DefaultCache<rustc_middle::ty::PseudoCanonicalInput<rustc_middle::mir::interpret::GlobalId>, rustc_middle::query::erase::Erased<[u8; 24]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
             8: rustc_query_impl::query_impl::eval_to_allocation_raw::get_query_non_incr::__rust_end_short_backtrace
             9: rustc_const_eval::const_eval::valtrees::eval_to_valtree
            10: <rustc_const_eval::provide::{closure#0} as core::ops::function::FnOnce<(rustc_middle::ty::context::TyCtxt, rustc_middle::ty::PseudoCanonicalInput<rustc_middle::mir::interpret::GlobalId>)>>::call_once
            11: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::eval_to_valtree::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 24]>>
            12: <rustc_query_impl::query_impl::eval_to_valtree::dynamic_query::{closure#2} as core::ops::function::FnOnce<(rustc_middle::ty::context::TyCtxt, rustc_middle::ty::PseudoCanonicalInput<rustc_middle::mir::interpret::GlobalId>)>>::call_once
            13: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::DefaultCache<rustc_middle::ty::PseudoCanonicalInput<rustc_middle::mir::interpret::GlobalId>, rustc_middle::query::erase::Erased<[u8; 24]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
            14: rustc_query_impl::query_impl::eval_to_valtree::get_query_non_incr::__rust_end_short_backtrace
            15: <rustc_middle::ty::context::TyCtxt>::const_eval_global_id_for_typeck
            16: <rustc_middle::ty::context::TyCtxt>::const_eval_resolve_for_typeck
            17: rustc_trait_selection::traits::try_evaluate_const
            18: <rustc_trait_selection::solve::delegate::SolverDelegate as rustc_next_trait_solver::delegate::SolverDelegate>::evaluate_const
            19: <rustc_type_ir::search_graph::SearchGraph<rustc_next_trait_solver::solve::search_graph::SearchGraphDelegate<rustc_trait_selection::solve::delegate::SolverDelegate>, rustc_middle::ty::context::TyCtxt>>::with_new_goal::<<rustc_next_trait_solver::solve::eval_ctxt::EvalCtxt<rustc_trait_selection::solve::delegate::SolverDelegate, rustc_middle::ty::context::TyCtxt>>::evaluate_canonical_goal::{closure#0}::{closure#0}::{closure#0}>::{closure#2}
            20: <rustc_type_ir::search_graph::SearchGraph<rustc_next_trait_solver::solve::search_graph::SearchGraphDelegate<rustc_trait_selection::solve::delegate::SolverDelegate>, rustc_middle::ty::context::TyCtxt>>::with_new_goal::<<rustc_next_trait_solver::solve::eval_ctxt::EvalCtxt<rustc_trait_selection::solve::delegate::SolverDelegate, rustc_middle::ty::context::TyCtxt>>::evaluate_canonical_goal::{closure#0}::{closure#0}::{closure#0}>
            21: <rustc_next_trait_solver::solve::eval_ctxt::EvalCtxt<rustc_trait_selection::solve::delegate::SolverDelegate, rustc_middle::ty::context::TyCtxt>>::evaluate_goal_raw
            22: <rustc_next_trait_solver::solve::eval_ctxt::EvalCtxt<rustc_trait_selection::solve::delegate::SolverDelegate, rustc_middle::ty::context::TyCtxt>>::evaluate_added_goals_step
            23: <rustc_type_ir::search_graph::SearchGraph<rustc_next_trait_solver::solve::search_graph::SearchGraphDelegate<rustc_trait_selection::solve::delegate::SolverDelegate>, rustc_middle::ty::context::TyCtxt>>::with_new_goal::<<rustc_next_trait_solver::solve::eval_ctxt::EvalCtxt<rustc_trait_selection::solve::delegate::SolverDelegate, rustc_middle::ty::context::TyCtxt>>::evaluate_canonical_goal::{closure#0}::{closure#0}::{closure#0}>::{closure#2}
            24: <rustc_type_ir::search_graph::SearchGraph<rustc_next_trait_solver::solve::search_graph::SearchGraphDelegate<rustc_trait_selection::solve::delegate::SolverDelegate>, rustc_middle::ty::context::TyCtxt>>::with_new_goal::<<rustc_next_trait_solver::solve::eval_ctxt::EvalCtxt<rustc_trait_selection::solve::delegate::SolverDelegate, rustc_middle::ty::context::TyCtxt>>::evaluate_canonical_goal::{closure#0}::{closure#0}::{closure#0}>
            25: <rustc_next_trait_solver::solve::eval_ctxt::EvalCtxt<rustc_trait_selection::solve::delegate::SolverDelegate, rustc_middle::ty::context::TyCtxt>>::evaluate_goal_raw
            26: <rustc_next_trait_solver::solve::eval_ctxt::EvalCtxt<rustc_trait_selection::solve::delegate::SolverDelegate, rustc_middle::ty::context::TyCtxt>>::evaluate_added_goals_step
            27: <rustc_next_trait_solver::solve::eval_ctxt::EvalCtxt<rustc_trait_selection::solve::delegate::SolverDelegate, rustc_middle::ty::context::TyCtxt>>::evaluate_added_goals_and_make_canonical_response::{closure#0}
            28: <rustc_type_ir::search_graph::SearchGraph<rustc_next_trait_solver::solve::search_graph::SearchGraphDelegate<rustc_trait_selection::solve::delegate::SolverDelegate>, rustc_middle::ty::context::TyCtxt>>::with_new_goal::<<rustc_next_trait_solver::solve::eval_ctxt::EvalCtxt<rustc_trait_selection::solve::delegate::SolverDelegate, rustc_middle::ty::context::TyCtxt>>::evaluate_canonical_goal::{closure#0}::{closure#0}::{closure#0}>::{closure#2}
            29: <rustc_type_ir::search_graph::SearchGraph<rustc_next_trait_solver::solve::search_graph::SearchGraphDelegate<rustc_trait_selection::solve::delegate::SolverDelegate>, rustc_middle::ty::context::TyCtxt>>::with_new_goal::<<rustc_next_trait_solver::solve::eval_ctxt::EvalCtxt<rustc_trait_selection::solve::delegate::SolverDelegate, rustc_middle::ty::context::TyCtxt>>::evaluate_canonical_goal::{closure#0}::{closure#0}::{closure#0}>
            30: <rustc_next_trait_solver::solve::eval_ctxt::EvalCtxt<rustc_trait_selection::solve::delegate::SolverDelegate, rustc_middle::ty::context::TyCtxt>>::evaluate_goal_raw
            31: <rustc_next_trait_solver::solve::eval_ctxt::EvalCtxt<rustc_trait_selection::solve::delegate::SolverDelegate, rustc_middle::ty::context::TyCtxt>>::enter_root::<core::result::Result<(rustc_next_trait_solver::solve::HasChanged, rustc_type_ir::solve::Certainty), rustc_type_ir::solve::NoSolution>, <rustc_trait_selection::solve::delegate::SolverDelegate as rustc_next_trait_solver::solve::eval_ctxt::SolverDelegateEvalExt>::evaluate_root_goal::{closure#0}>
            32: <rustc_trait_selection::solve::fulfill::FulfillmentCtxt<rustc_infer::traits::engine::ScrubbedTraitError> as rustc_infer::traits::engine::TraitEngine<rustc_infer::traits::engine::ScrubbedTraitError>>::select_where_possible
            33: <rustc_trait_selection::solve::fulfill::FulfillmentCtxt<rustc_infer::traits::engine::ScrubbedTraitError> as rustc_infer::traits::engine::TraitEngine<rustc_infer::traits::engine::ScrubbedTraitError>>::select_all_or_error
            34: rustc_trait_selection::traits::coherence::impl_intersection_has_negative_obligation
            35: rustc_trait_selection::traits::coherence::overlap
            36: <rustc_middle::traits::specialization_graph::Children as rustc_trait_selection::traits::specialize::specialization_graph::ChildrenExt>::insert
            37: <rustc_middle::traits::specialization_graph::Graph as rustc_trait_selection::traits::specialize::specialization_graph::GraphExt>::insert
            38: rustc_trait_selection::traits::specialize::specialization_graph_provider
            39: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::specialization_graph_of::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 8]>>
            40: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::DefIdCache<rustc_middle::query::erase::Erased<[u8; 8]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
            41: rustc_query_impl::query_impl::specialization_graph_of::get_query_non_incr::__rust_end_short_backtrace
            42: rustc_hir_analysis::coherence::coherent_trait
            43: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::coherent_trait::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 1]>>
            44: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::DefIdCache<rustc_middle::query::erase::Erased<[u8; 1]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
            45: rustc_query_impl::query_impl::coherent_trait::get_query_non_incr::__rust_end_short_backtrace
            46: rustc_hir_analysis::check::wfcheck::check_well_formed
            47: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::check_well_formed::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 1]>>
            48: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_data_structures::vec_cache::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::Erased<[u8; 1]>, rustc_query_system::dep_graph::graph::DepNodeIndex>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
            49: rustc_query_impl::query_impl::check_well_formed::get_query_non_incr::__rust_end_short_backtrace
            50: rustc_hir_analysis::check::wfcheck::check_mod_type_wf
            51: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::check_mod_type_wf::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 1]>>
            52: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::DefaultCache<rustc_span::def_id::LocalModDefId, rustc_middle::query::erase::Erased<[u8; 1]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
            53: rustc_query_impl::query_impl::check_mod_type_wf::get_query_non_incr::__rust_end_short_backtrace
            54: rustc_hir_analysis::check_crate
            55: rustc_interface::passes::run_required_analyses
            56: rustc_interface::passes::analysis
            57: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 0]>>
            58: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::SingleCache<rustc_middle::query::erase::Erased<[u8; 0]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
            59: rustc_query_impl::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
            60: rustc_interface::passes::create_and_enter_global_ctxt::<core::option::Option<rustc_interface::queries::Linker>, rustc_driver_impl::run_compiler::{closure#0}::{closure#2}>::{closure#2}::{closure#0}
            61: rustc_interface::interface::run_compiler::<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}
            62: std::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
            63: <<std::thread::Builder>::spawn_unchecked_<rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
            64: std::sys::pal::unix::thread::Thread::new::thread_start
            65: <unknown>
            66: <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 1.88.0-nightly (2ad5f8607 2025-05-03) running on x86_64-unknown-linux-gnu

query stack during panic:
end of query stack

@rustbot label +F-with_negative_coherence +F-generic_const_exprs