SignatureMismatch ICE

Code

The crate symbolica version 0.18.0 (https://crates.io/crates/symbolica) does not compile on stable Rust 1.90 in release mode.

cargo build # works
cargo build --release # ICE

I will try to create a minimal example.

Error output

error: internal compiler error: compiler/rustc_traits/src/codegen.rs:45:13: Encountered error `SignatureMismatch(SignatureMismatchData { found_trait_ref: <{closure@src/poly/gcd.rs:3594:29: 3594:32} as std::ops::Fn<(&domains::algebraic_number::AlgebraicNumber<domains::finite_field::FiniteField<UField>>,)>>, expected_trait_ref: <{closure@src/poly/gcd.rs:3594:29: 3594:32} as std::ops::Fn<(&<domains::algebraic_number::AlgebraicExtension<domains::finite_field::FiniteField<UField>> as domains::Ring>::Element,)>>, terr: Sorts(ExpectedFound { expected: Alias(Projection, AliasTy { args: [domains::algebraic_number::AlgebraicExtension<domains::finite_field::FiniteField<UField/#0>>], def_id: DefId(0:4283 ~ symbolica[e0c6]::domains::Ring::Element), .. }), found: domains::algebraic_number::AlgebraicNumber<domains::finite_field::FiniteField<UField/#0>> }) })` selecting `<{closure@src/poly/gcd.rs:3594:29: 3594:32} as std::ops::Fn<(&<domains::algebraic_number::AlgebraicExtension<domains::finite_field::FiniteField<UField>> as domains::Ring>::Element,)>>` during codegen

Backtrace

thread 'rustc' panicked at compiler/rustc_traits/src/codegen.rs:45:13:
Box<dyn Any>
stack backtrace:
   0:     0x7f63ca800f83 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::hdcfcb6d4c8489523
   1:     0x7f63cb002d77 - core::fmt::write::h8a494366950f23bb
   2:     0x7f63cc3d14d1 - std::io::Write::write_fmt::h6556609fca33d0b1
   3:     0x7f63ca800de2 - std::sys::backtrace::BacktraceLock::print::hb2a626a81e06b2dc
   4:     0x7f63ca804887 - std::panicking::default_hook::{{closure}}::h4f78485264f12d10
   5:     0x7f63ca8043eb - std::panicking::default_hook::h2c66fc99e962531d
   6:     0x7f63c98627e3 - std[9479b33d5e275715]::panicking::update_hook::<alloc[252dd2b3abdfe4a]::boxed::Box<rustc_driver_impl[773a1ede480c2143]::install_ice_hook::{closure#1}>>::{closure#0}
   7:     0x7f63ca8050ce - std::panicking::rust_panic_with_hook::h33ac55f64bbd807d
   8:     0x7f63c989c2f1 - std[9479b33d5e275715]::panicking::begin_panic::<rustc_errors[93b6cceb9b5fedc8]::ExplicitBug>::{closure#0}
   9:     0x7f63c9891286 - std[9479b33d5e275715]::sys::backtrace::__rust_end_short_backtrace::<std[9479b33d5e275715]::panicking::begin_panic<rustc_errors[93b6cceb9b5fedc8]::ExplicitBug>::{closure#0}, !>
  10:     0x7f63c9890f17 - std[9479b33d5e275715]::panicking::begin_panic::<rustc_errors[93b6cceb9b5fedc8]::ExplicitBug>
  11:     0x7f63c98a5f91 - <rustc_errors[93b6cceb9b5fedc8]::diagnostic::BugAbort as rustc_errors[93b6cceb9b5fedc8]::diagnostic::EmissionGuarantee>::emit_producing_guarantee
  12:     0x7f63c9eb5dda - rustc_middle[581473cc959b0df7]::util::bug::opt_span_bug_fmt::<rustc_span[dd7040bcb6abea74]::span_encoding::Span>::{closure#0}
  13:     0x7f63c9e9560a - rustc_middle[581473cc959b0df7]::ty::context::tls::with_opt::<rustc_middle[581473cc959b0df7]::util::bug::opt_span_bug_fmt<rustc_span[dd7040bcb6abea74]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  14:     0x7f63c9e9547b - rustc_middle[581473cc959b0df7]::ty::context::tls::with_context_opt::<rustc_middle[581473cc959b0df7]::ty::context::tls::with_opt<rustc_middle[581473cc959b0df7]::util::bug::opt_span_bug_fmt<rustc_span[dd7040bcb6abea74]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  15:     0x7f63c6ed1fb0 - rustc_middle[581473cc959b0df7]::util::bug::bug_fmt
  16:     0x7f63cbd5cad7 - rustc_traits[bfbeae1a3e4b8cfd]::codegen::codegen_select_candidate
  17:     0x7f63cbd5a6b3 - rustc_query_impl[4e8a788e737bdb2b]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[4e8a788e737bdb2b]::query_impl::codegen_select_candidate::dynamic_query::{closure#2}::{closure#0}, rustc_middle[581473cc959b0df7]::query::erase::Erased<[u8; 16usize]>>
  18:     0x7f63cbd59734 - rustc_query_system[5711f675e4c02644]::query::plumbing::try_execute_query::<rustc_query_impl[4e8a788e737bdb2b]::DynamicConfig<rustc_query_system[5711f675e4c02644]::query::caches::DefaultCache<rustc_middle[581473cc959b0df7]::ty::PseudoCanonicalInput<rustc_type_ir[e11decee25f0b077]::predicate::TraitRef<rustc_middle[581473cc959b0df7]::ty::context::TyCtxt>>, rustc_middle[581473cc959b0df7]::query::erase::Erased<[u8; 16usize]>>, false, false, false>, rustc_query_impl[4e8a788e737bdb2b]::plumbing::QueryCtxt, false>
  19:     0x7f63cbd593a3 - rustc_query_impl[4e8a788e737bdb2b]::query_impl::codegen_select_candidate::get_query_non_incr::__rust_end_short_backtrace
  20:     0x7f63cb74ac96 - rustc_ty_utils[327c3462a5d70139]::instance::resolve_instance_raw
  21:     0x7f63cb749700 - rustc_query_impl[4e8a788e737bdb2b]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[4e8a788e737bdb2b]::query_impl::resolve_instance_raw::dynamic_query::{closure#2}::{closure#0}, rustc_middle[581473cc959b0df7]::query::erase::Erased<[u8; 32usize]>>
  22:     0x7f63cb748826 - rustc_query_system[5711f675e4c02644]::query::plumbing::try_execute_query::<rustc_query_impl[4e8a788e737bdb2b]::DynamicConfig<rustc_query_system[5711f675e4c02644]::query::caches::DefaultCache<rustc_middle[581473cc959b0df7]::ty::PseudoCanonicalInput<(rustc_span[dd7040bcb6abea74]::def_id::DefId, &rustc_middle[581473cc959b0df7]::ty::list::RawList<(), rustc_middle[581473cc959b0df7]::ty::generic_args::GenericArg>)>, rustc_middle[581473cc959b0df7]::query::erase::Erased<[u8; 32usize]>>, false, false, false>, rustc_query_impl[4e8a788e737bdb2b]::plumbing::QueryCtxt, false>
  23:     0x7f63cb748469 - rustc_query_impl[4e8a788e737bdb2b]::query_impl::resolve_instance_raw::get_query_non_incr::__rust_end_short_backtrace
  24:     0x7f63cb73caa2 - <rustc_middle[581473cc959b0df7]::ty::instance::Instance>::try_resolve
  25:     0x7f63cc2109a6 - rustc_mir_transform[134cdb5752387f32]::inline::cycle::process::{closure#0}
  26:     0x7f63cc2104f7 - rustc_mir_transform[134cdb5752387f32]::inline::cycle::process::{closure#0}
  27:     0x7f63cc2104f7 - rustc_mir_transform[134cdb5752387f32]::inline::cycle::process::{closure#0}
  28:     0x7f63cc2104f7 - rustc_mir_transform[134cdb5752387f32]::inline::cycle::process::{closure#0}
  29:     0x7f63cc2104f7 - rustc_mir_transform[134cdb5752387f32]::inline::cycle::process::{closure#0}
  30:     0x7f63cc2104f7 - rustc_mir_transform[134cdb5752387f32]::inline::cycle::process::{closure#0}
  31:     0x7f63cc2104f7 - rustc_mir_transform[134cdb5752387f32]::inline::cycle::process::{closure#0}
  32:     0x7f63cc2104f7 - rustc_mir_transform[134cdb5752387f32]::inline::cycle::process::{closure#0}
  33:     0x7f63cc2104f7 - rustc_mir_transform[134cdb5752387f32]::inline::cycle::process::{closure#0}
  34:     0x7f63cc2104f7 - rustc_mir_transform[134cdb5752387f32]::inline::cycle::process::{closure#0}
  35:     0x7f63cc2104f7 - rustc_mir_transform[134cdb5752387f32]::inline::cycle::process::{closure#0}
  36:     0x7f63cc2104f7 - rustc_mir_transform[134cdb5752387f32]::inline::cycle::process::{closure#0}
  37:     0x7f63cc20f7ee - rustc_mir_transform[134cdb5752387f32]::inline::cycle::mir_callgraph_cyclic
  38:     0x7f63cc20f322 - rustc_query_impl[4e8a788e737bdb2b]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[4e8a788e737bdb2b]::query_impl::mir_callgraph_cyclic::dynamic_query::{closure#2}::{closure#0}, rustc_middle[581473cc959b0df7]::query::erase::Erased<[u8; 8usize]>>
  39:     0x7f63cb1dd3ae - rustc_query_system[5711f675e4c02644]::query::plumbing::try_execute_query::<rustc_query_impl[4e8a788e737bdb2b]::DynamicConfig<rustc_data_structures[32e9e1243901af9b]::vec_cache::VecCache<rustc_span[dd7040bcb6abea74]::def_id::LocalDefId, rustc_middle[581473cc959b0df7]::query::erase::Erased<[u8; 8usize]>, rustc_query_system[5711f675e4c02644]::dep_graph::graph::DepNodeIndex>, false, false, false>, rustc_query_impl[4e8a788e737bdb2b]::plumbing::QueryCtxt, false>
  40:     0x7f63cb727f13 - rustc_query_impl[4e8a788e737bdb2b]::query_impl::mir_callgraph_cyclic::get_query_non_incr::__rust_end_short_backtrace
  41:     0x7f63cb724f3a - rustc_mir_transform[134cdb5752387f32]::inline::process_blocks::<rustc_mir_transform[134cdb5752387f32]::inline::NormalInliner>
  42:     0x7f63cba8f9c0 - <rustc_mir_transform[134cdb5752387f32]::inline::Inline as rustc_mir_transform[134cdb5752387f32]::pass_manager::MirPass>::run_pass
  43:     0x7f63cb011587 - rustc_mir_transform[134cdb5752387f32]::run_optimization_passes
  44:     0x7f63cbc50080 - rustc_mir_transform[134cdb5752387f32]::optimized_mir
  45:     0x7f63cbc4fc61 - rustc_query_impl[4e8a788e737bdb2b]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[4e8a788e737bdb2b]::query_impl::optimized_mir::dynamic_query::{closure#2}::{closure#0}, rustc_middle[581473cc959b0df7]::query::erase::Erased<[u8; 8usize]>>
  46:     0x7f63cb018e25 - rustc_query_system[5711f675e4c02644]::query::plumbing::try_execute_query::<rustc_query_impl[4e8a788e737bdb2b]::DynamicConfig<rustc_query_system[5711f675e4c02644]::query::caches::DefIdCache<rustc_middle[581473cc959b0df7]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[4e8a788e737bdb2b]::plumbing::QueryCtxt, false>
  47:     0x7f63cb01831b - rustc_query_impl[4e8a788e737bdb2b]::query_impl::optimized_mir::get_query_non_incr::__rust_end_short_backtrace
  48:     0x7f63cbb75c13 - <rustc_metadata[e50638f1c3dcb01e]::rmeta::encoder::EncodeContext>::encode_crate_root
  49:     0x7f63cc591a30 - <rustc_metadata[e50638f1c3dcb01e]::rmeta::encoder::encode_metadata::{closure#3} as core[42326c15e70145c1]::ops::function::FnOnce<(rustc_middle[581473cc959b0df7]::ty::context::TyCtxt, &std[9479b33d5e275715]::path::Path)>>::call_once
  50:     0x7f63cc58ec70 - rustc_metadata[e50638f1c3dcb01e]::rmeta::encoder::encode_metadata
  51:     0x7f63cbf47d97 - rustc_metadata[e50638f1c3dcb01e]::fs::encode_and_write_metadata
  52:     0x7f63cc41a2c3 - <rustc_interface[c9c4c8df4db17049]::queries::Linker>::codegen_and_build_linker
  53:     0x7f63cc417ebc - rustc_interface[c9c4c8df4db17049]::passes::create_and_enter_global_ctxt::<core[42326c15e70145c1]::option::Option<rustc_interface[c9c4c8df4db17049]::queries::Linker>, rustc_driver_impl[773a1ede480c2143]::run_compiler::{closure#0}::{closure#2}>::{closure#2}::{closure#0}
  54:     0x7f63cc2c11f1 - rustc_interface[c9c4c8df4db17049]::interface::run_compiler::<(), rustc_driver_impl[773a1ede480c2143]::run_compiler::{closure#0}>::{closure#1}
  55:     0x7f63cc1751c1 - std[9479b33d5e275715]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[c9c4c8df4db17049]::util::run_in_thread_with_globals<rustc_interface[c9c4c8df4db17049]::util::run_in_thread_pool_with_globals<rustc_interface[c9c4c8df4db17049]::interface::run_compiler<(), rustc_driver_impl[773a1ede480c2143]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
  56:     0x7f63cc174ea2 - <<std[9479b33d5e275715]::thread::Builder>::spawn_unchecked_<rustc_interface[c9c4c8df4db17049]::util::run_in_thread_with_globals<rustc_interface[c9c4c8df4db17049]::util::run_in_thread_pool_with_globals<rustc_interface[c9c4c8df4db17049]::interface::run_compiler<(), rustc_driver_impl[773a1ede480c2143]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core[42326c15e70145c1]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  57:     0x7f63cc17a7c5 - std::sys::pal::unix::thread::Thread::new::thread_start::hb6e99e73da4d28f8
  58:     0x7f63c58969cb - <unknown>
  59:     0x7f63c591aa0c - <unknown>
  60:                0x0 - <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: rustc 1.90.0 (1159e78c4 2025-09-14) running on x86_64-unknown-linux-gnu

note: compiler flags: --crate-type lib -C opt-level=3 -C linker-plugin-lto -C codegen-units=1 -C strip=debuginfo

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

query stack during panic:
#0 [codegen_select_candidate] computing candidate for `<{closure@src/poly/gcd.rs:3594:29: 3594:32} as core::ops::function::Fn<(&<domains::algebraic_number::AlgebraicExtension<domains::finite_field::FiniteField<UField>> as domains::Ring>::Element,)>>`
#1 [resolve_instance_raw] resolving instance `<{closure@src/poly/gcd.rs:3594:29: 3594:32} as core::ops::function::Fn<(&<domains::algebraic_number::AlgebraicExtension<domains::finite_field::FiniteField<UField>> as domains::Ring>::Element,)>>::call`
... and 2 other queries... use `env RUST_BACKTRACE=1` to see the full query stack
warning: `symbolica` (lib) generated 1 warning (run `cargo fix --lib -p symbolica` to apply 1 suggestion)
error: could not compile `symbolica` (lib); 1 warning emitted

Caused by:
  process didn't exit successfully: `/home/ben/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/bin/rustc --crate-name symbolica --edition=2024 src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --diagnostic-width=80 --crate-type lib --emit=dep-info,metadata,link -C opt-level=3 -C linker-plugin-lto -C codegen-units=1 --cfg 'feature="default"' --cfg 'feature="tracing_only_warnings"' --check-cfg 'cfg(docsrs,test)' --check-cfg 'cfg(feature, values("bincode", "default", "experimental_poly_gcd", "faster_alloc", "full_fn_cmp", "mathematica_api", "numpy", "pyo3", "pyo3-log", "pyo3-stub-gen", "python_abi3", "python_api", "python_export", "python_stubgen", "serde", "tikv-jemallocator", "tracing_only_warnings", "wolfram-library-link"))' -C metadata=96c1357d8f8088f0 -C extra-filename=-62104d022c125146 --out-dir /home/ben/Sync/Work/symbolica/target/release/deps -C strip=debuginfo -L dependency=/home/ben/Sync/Work/symbolica/target/release/deps --extern ahash=/home/ben/Sync/Work/symbolica/target/release/deps/libahash-7a28b9ed158fd863.rmeta --extern append_only_vec=/home/ben/Sync/Work/symbolica/target/release/deps/libappend_only_vec-99a1c43390cfa51d.rmeta --extern brotli=/home/ben/Sync/Work/symbolica/target/release/deps/libbrotli-b331a1cc75e182c6.rmeta --extern byteorder=/home/ben/Sync/Work/symbolica/target/release/deps/libbyteorder-119ee8ca0470af32.rmeta --extern bytes=/home/ben/Sync/Work/symbolica/target/release/deps/libbytes-d3dd46bcdca0d31b.rmeta --extern colored=/home/ben/Sync/Work/symbolica/target/release/deps/libcolored-594090e79fcf27f6.rmeta --extern dyn_clone=/home/ben/Sync/Work/symbolica/target/release/deps/libdyn_clone-328c01212571218b.rmeta --extern libloading=/home/ben/Sync/Work/symbolica/target/release/deps/liblibloading-71bafbff0017e61b.rmeta --extern log=/home/ben/Sync/Work/symbolica/target/release/deps/liblog-2bbc0195c15cb2c1.rmeta --extern once_cell=/home/ben/Sync/Work/symbolica/target/release/deps/libonce_cell-869860742b3ecb49.rmeta --extern rand=/home/ben/Sync/Work/symbolica/target/release/deps/librand-268f0610b8ef0ce7.rmeta --extern rand_xoshiro=/home/ben/Sync/Work/symbolica/target/release/deps/librand_xoshiro-cff907330d684396.rmeta --extern rayon=/home/ben/Sync/Work/symbolica/target/release/deps/librayon-828f49a5b01c9dd4.rmeta --extern rug=/home/ben/Sync/Work/symbolica/target/release/deps/librug-a6424c8c041e4fbe.rmeta --extern self_cell=/home/ben/Sync/Work/symbolica/target/release/deps/libself_cell-399a7f5929460284.rmeta --extern smallvec=/home/ben/Sync/Work/symbolica/target/release/deps/libsmallvec-3fbe0bd8f44cbfdd.rmeta --extern smartstring=/home/ben/Sync/Work/symbolica/target/release/deps/libsmartstring-d37711d81c03e4ec.rmeta --extern tinyjson=/home/ben/Sync/Work/symbolica/target/release/deps/libtinyjson-b436034f636b2f36.rmeta --extern tracing=/home/ben/Sync/Work/symbolica/target/release/deps/libtracing-35e9ac652d116700.rmeta --extern wide=/home/ben/Sync/Work/symbolica/target/release/deps/libwide-f8d3161bff5ff866.rmeta -L native=/home/ben/Sync/Work/symbolica/target/release/build/gmp-mpfr-sys-0c198db2c79fef3a/out/lib` (exit status: 101)

bisection points to #142625

searched nightlies: from nightly-2025-06-23 to nightly-2025-09-24
regressed nightly: nightly-2025-06-29
searched commit range: bdaba05...11ad40b
regressed commit: 11ad40b

@cjgillot

cc @cjgillot

@rustbot

Assigning priority (discussion on Zulip).

@rustbot label -I-prioritize +P-high

This was previously reported at symbolica-dev/symbolica#33 but unfortunately not here.

@cjgillot

This crate is huge and hard to reduce, so I ran out of time. It's messy and can be reduced still, but I have something that's small enough for a test @cjgillot.

130-line repro

#[derive(Clone)]
struct AlgebraicExtension<R> {
    _x: R,
}
impl<T> GaloisField for AlgebraicExtension<FiniteField<T>>
where
    FiniteField<T>: Field,
{
    type Base = FiniteField<T>;
    fn upgrade(&self) -> AlgebraicExtension<Self::Base> {
        fn is_irreducible<UField>(poly: &mut MultivariatePolynomial<FiniteField<UField>, u16>)
        where
            FiniteField<UField>: Field,
        {
            poly.bivariate_factorization();
            poly.multivariate_factorization();
        }
        let mut poly = MultivariatePolynomial::new();
        is_irreducible(&mut poly);
        todo!()
    }
}
impl<R: Clone> Ring for AlgebraicExtension<R> {
    type Element = u16;
}
impl<R: Clone> EuclideanDomain for AlgebraicExtension<R> {}
impl<R: Field> Field for AlgebraicExtension<R> {}
trait GaloisField: Field {
    type Base: Field;
    fn upgrade(&self) -> AlgebraicExtension<Self::Base> {
        unimplemented!()
    }
    fn upgrade_element(
        &self,
        _: &Self::Element,
    ) -> <AlgebraicExtension<Self::Base> as Ring>::Element {
        unimplemented!()
    }
}
impl<UField> GaloisField for FiniteField<UField>
where
    FiniteField<UField>: Field,
{
    type Base = Self;
}
struct FiniteField<UField> {
    _m: UField,
}
trait Ring: Clone {
    type Element;
}
trait EuclideanDomain: Ring {}
trait Field: EuclideanDomain {}
impl<UField, F: GaloisField<Base = FiniteField<UField>>, E> MultivariatePolynomial<F, E>
where
    FiniteField<UField>: Field,
    AlgebraicExtension<<F as GaloisField>::Base>: PolynomialGCD<E>,
{
    fn bivariate_factorization(&self) {
        let _ = PolynomialGCD::gcd(self);
        let field = self.ring.upgrade();
        let s_l = self.map_coeff(|c| self.ring.upgrade_element(c), field.clone());
        s_l.bivariate_factorization();
    }
    fn multivariate_factorization(&self) -> Vec<Self> {
        unimplemented!()
    }
}
trait PolynomialGCD<E>: Ring {
    fn gcd(_: &MultivariatePolynomial<Self, E>) -> MultivariatePolynomial<Self, E> {
        unimplemented!()
    }
}
impl<UField, F: GaloisField<Base = FiniteField<UField>>, E> PolynomialGCD<E> for F
where
    FiniteField<UField>: Field,
{
    fn gcd(a: &MultivariatePolynomial<Self, E>) -> MultivariatePolynomial<Self, E> {
        let field = a.ring.upgrade();
        let ag = a.map_coeff(|c| a.ring.upgrade_element(c), field.clone());
        let g = PolynomialGCD::gcd(&ag);
        g.map_coeff(|_| todo!(), a.ring.clone())
    }
}
use std::marker::PhantomData;
#[derive(Clone)]
struct MultivariatePolynomial<F: Ring, E = u16> {
    ring: F,
    _phantom: PhantomData<(E, F)>,
}
impl<F: Ring, E> MultivariatePolynomial<F, E> {
    fn new() -> Self {
        unimplemented!()
    }
}
impl<F: Ring, E> MultivariatePolynomial<F, E> {
    fn map_coeff<U: Ring, T: Fn(&F::Element) -> U::Element>(
        &self,
        f: T,
        field: U,
    ) -> MultivariatePolynomial<U, E> {
        for m in self.into_iter() {
            f(m.coefficient);
        }
        MultivariatePolynomial {
            ring: todo!(),
            _phantom: PhantomData,
        }
    }
}
struct MonomialView<'a, F: 'a + Ring> {
    coefficient: &'a F::Element,
}
struct MonomialViewIterator<'a, F, E> {
    _m: &'a (F, E),
}
impl<'a, F: Ring, E> Iterator for MonomialViewIterator<'a, F, E> {
    type Item = MonomialView<'a, F>;
    fn next(&mut self) -> Option<Self::Item> {
        unimplemented!()
    }
}
impl<'a, F: Ring, E> IntoIterator for &'a MultivariatePolynomial<F, E> {
    type Item = MonomialView<'a, F>;
    type IntoIter = MonomialViewIterator<'a, F, E>;
    fn into_iter(self) -> Self::IntoIter {
        unimplemented!()
    }
}

> CARGO_INCREMENTAL=0 RUSTFLAGS="-Zinline-mir -Zmir-opt-level=0" cargo build

error: internal compiler error: compiler/rustc_traits/src/codegen.rs:45:13: Encountered error `SignatureMismatch(SignatureMismatchData { found_trait_ref: <{closure@src/lib.rs:82:21: 82:24} as std::ops::Fn<(&u16,)>>, expected_trait_ref: <{closure@src/lib.rs:82:21: 82:24} as std::ops::Fn<(&<AlgebraicExtension<FiniteField<UField>> as Ring>::Element,)>>, terr: Sorts(ExpectedFound { expected: Alias(Projection, AliasTy { args: [AlgebraicExtension<FiniteField<UField/#0>>], def_id: DefId(0:27 ~ symbolica[02ae]::Ring::Element), .. }), found: u16 }) })` selecting `<{closure@src/lib.rs:82:21: 82:24} as std::ops::Fn<(&<AlgebraicExtension<FiniteField<UField>> as Ring>::Element,)>>` during codegen

No, sorry, releasing assignment

Add high-priority ICE: rust-lang#146965

Rollup merge of rust-lang#153321 - fanninpm:test-crashes-add-high-pri…

@rustbot

@rustbot label +S-bug-has-test

possible minimal fix for #146965, #146813, and #158756

Auto merge of #159209 - mumbleskates:trait-selection-experiment, r=<try>

root cause is #152409

Rollup merge of rust-lang#163806 - lcnr:crashes-migration-cont, r=lqd

Unrolled build for #163806 in rollup 163957

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SignatureMismatch ICE #146965

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lukaslueg commented on Sep 24, 2025

lqd commented on Sep 24, 2025

apiraino commented on Sep 24, 2025

theemathas commented on Sep 24, 2025

lqd commented on Sep 26, 2025

12 remaining items

cjgillot commented on Jan 22, 2026

fanninpm commented on Mar 13, 2026

lcnr commented on Oct 6, 2026

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