warning: the feature `min_generic_const_args` is incomplete and may not be safe to use and/or cause compiler crashes
 --> <crate attribute>:1:12
  |
1 | #![feature(min_generic_const_args)]
  |            ^^^^^^^^^^^^^^^^^^^^^^
  |
  = note: see issue #132980 <https://github.com/rust-lang/rust/issues/132980> for more information
  = note: `#[warn(incomplete_features)]` on by default

warning: trait `IntFactory` is never used
 --> /tmp/icemaker_global_tempdir.TJ6O05VzT4z2/rustc_testrunner_tmpdir_reporting.TK0D9OZGm2PI/mvce.rs:3:7
  |
3 | trait IntFactory {
  |       ^^^^^^^^^^
  |
  = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default

warning: trait `SendIntFactory` is never used
 --> /tmp/icemaker_global_tempdir.TJ6O05VzT4z2/rustc_testrunner_tmpdir_reporting.TK0D9OZGm2PI/mvce.rs:6:7
  |
6 | trait SendIntFactory: IntFactory<stream(..): Send> + Send {}
  |       ^^^^^^^^^^^^^^

warning: 3 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[E0391]: cycle detected when computing function signature of `IntFactory::stream`
 --> /tmp/icemaker_global_tempdir.TJ6O05VzT4z2/rustc_testrunner_tmpdir_reporting.TK0D9OZGm2PI/mvce.rs:4:5
  |
4 |     fn stream(&self) -> impl IntFactory<stream(..): Send>;
  |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  |
note: ...which requires looking up late bound vars inside `IntFactory::stream`...
 --> /tmp/icemaker_global_tempdir.TJ6O05VzT4z2/rustc_testrunner_tmpdir_reporting.TK0D9OZGm2PI/mvce.rs:4:5
  |
4 |     fn stream(&self) -> impl IntFactory<stream(..): Send>;
  |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
note: ...which requires resolving lifetimes for `IntFactory::stream`...
 --> /tmp/icemaker_global_tempdir.TJ6O05VzT4z2/rustc_testrunner_tmpdir_reporting.TK0D9OZGm2PI/mvce.rs:4:5
  |
4 |     fn stream(&self) -> impl IntFactory<stream(..): Send>;
  |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  = note: ...which again requires computing function signature of `IntFactory::stream`, completing the cycle
note: cycle used when resolving lifetimes for `SendIntFactory`
 --> /tmp/icemaker_global_tempdir.TJ6O05VzT4z2/rustc_testrunner_tmpdir_reporting.TK0D9OZGm2PI/mvce.rs:6:1
  |
6 | trait SendIntFactory: IntFactory<stream(..): Send> + Send {}
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  = note: see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information
note: delayed at /rustc-dev/53d60bb1c5d325b43419c7618287a1405dec36d0/compiler/rustc_query_impl/src/job.rs:509:20
         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::diagnostic::Diag>::delay_as_bug
         4: <rustc_query_impl::from_cycle_error::specialize_query_vtables::{closure#0} as core::ops::function::FnOnce<(rustc_middle::ty::context::TyCtxt, rustc_span::def_id::DefId, rustc_middle::query::plumbing::CycleError, rustc_errors::diagnostic::Diag)>>::call_once
         5: rustc_query_impl::execution::mk_cycle::<rustc_middle::query::caches::DefIdCache<rustc_middle::query::erase::ErasedData<[u8; 24]>>>
         6: rustc_query_impl::execution::try_execute_query::<rustc_middle::query::caches::DefIdCache<rustc_middle::query::erase::ErasedData<[u8; 24]>>, false>
         7: rustc_query_impl::query_impl::fn_sig::execute_query_non_incr::__rust_end_short_backtrace
         8: <rustc_hir_analysis::collect::resolve_bound_vars::BoundVarContext as rustc_hir::intravisit::Visitor>::visit_path
         9: <rustc_hir_analysis::collect::resolve_bound_vars::BoundVarContext>::visit_poly_trait_ref_inner
        10: <rustc_hir_analysis::collect::resolve_bound_vars::BoundVarContext as rustc_hir::intravisit::Visitor>::visit_opaque_ty
        11: <rustc_hir_analysis::collect::resolve_bound_vars::BoundVarContext as rustc_hir::intravisit::Visitor>::visit_trait_item
        12: rustc_query_impl::query_impl::resolve_bound_vars::invoke_provider_fn::__rust_begin_short_backtrace
        13: rustc_query_impl::execution::try_execute_query::<rustc_data_structures::vec_cache::VecCache<rustc_hir_id::OwnerId, rustc_middle::query::erase::ErasedData<[u8; 8]>, rustc_middle::dep_graph::graph::DepNodeIndex>, false>
        14: rustc_query_impl::query_impl::resolve_bound_vars::execute_query_non_incr::__rust_end_short_backtrace
        15: rustc_query_impl::query_impl::late_bound_vars_map::invoke_provider_fn::__rust_begin_short_backtrace
        16: rustc_query_impl::execution::try_execute_query::<rustc_data_structures::vec_cache::VecCache<rustc_hir_id::OwnerId, rustc_middle::query::erase::ErasedData<[u8; 8]>, rustc_middle::dep_graph::graph::DepNodeIndex>, false>
        17: rustc_query_impl::query_impl::late_bound_vars_map::execute_query_non_incr::__rust_end_short_backtrace
        18: <rustc_middle::ty::context::TyCtxt>::late_bound_vars
        19: <dyn rustc_hir_analysis::hir_ty_lowering::HirTyLowerer>::lower_fn_ty
        20: rustc_hir_analysis::collect::fn_sig
        21: rustc_query_impl::query_impl::fn_sig::invoke_provider_fn::__rust_begin_short_backtrace
        22: rustc_query_impl::execution::try_execute_query::<rustc_middle::query::caches::DefIdCache<rustc_middle::query::erase::ErasedData<[u8; 24]>>, false>
        23: rustc_query_impl::query_impl::fn_sig::execute_query_non_incr::__rust_end_short_backtrace
        24: <rustc_hir_analysis::collect::resolve_bound_vars::BoundVarContext as rustc_hir::intravisit::Visitor>::visit_path
        25: <rustc_hir_analysis::collect::resolve_bound_vars::BoundVarContext>::visit_poly_trait_ref_inner
        26: rustc_hir::intravisit::walk_item::<rustc_hir_analysis::collect::resolve_bound_vars::BoundVarContext>
        27: <rustc_hir_analysis::collect::resolve_bound_vars::BoundVarContext as rustc_hir::intravisit::Visitor>::visit_item
        28: rustc_query_impl::query_impl::resolve_bound_vars::invoke_provider_fn::__rust_begin_short_backtrace
        29: rustc_query_impl::execution::try_execute_query::<rustc_data_structures::vec_cache::VecCache<rustc_hir_id::OwnerId, rustc_middle::query::erase::ErasedData<[u8; 8]>, rustc_middle::dep_graph::graph::DepNodeIndex>, false>
        30: rustc_query_impl::query_impl::resolve_bound_vars::execute_query_non_incr::__rust_end_short_backtrace
        31: rustc_query_impl::query_impl::late_bound_vars_map::invoke_provider_fn::__rust_begin_short_backtrace
        32: rustc_query_impl::execution::try_execute_query::<rustc_data_structures::vec_cache::VecCache<rustc_hir_id::OwnerId, rustc_middle::query::erase::ErasedData<[u8; 8]>, rustc_middle::dep_graph::graph::DepNodeIndex>, false>
        33: rustc_query_impl::query_impl::late_bound_vars_map::execute_query_non_incr::__rust_end_short_backtrace
        34: <dyn rustc_hir_analysis::hir_ty_lowering::HirTyLowerer>::lower_poly_trait_ref
        35: <dyn rustc_hir_analysis::hir_ty_lowering::HirTyLowerer>::lower_bounds::<&[rustc_hir::hir::GenericBound]>
        36: rustc_hir_analysis::collect::predicates_of::implied_predicates_with_filter
        37: rustc_hir_analysis::collect::predicates_of::explicit_super_predicates_of
        38: rustc_query_impl::query_impl::explicit_super_predicates_of::invoke_provider_fn::__rust_begin_short_backtrace
        39: rustc_query_impl::execution::try_execute_query::<rustc_middle::query::caches::DefIdCache<rustc_middle::query::erase::ErasedData<[u8; 16]>>, false>
        40: rustc_query_impl::query_impl::explicit_super_predicates_of::execute_query_non_incr::__rust_end_short_backtrace
        41: rustc_hir_analysis::check::check::check_item_type
        42: rustc_hir_analysis::check::wfcheck::check_well_formed
        43: rustc_query_impl::query_impl::check_well_formed::invoke_provider_fn::__rust_begin_short_backtrace
        44: rustc_query_impl::execution::try_execute_query::<rustc_data_structures::vec_cache::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::ErasedData<[u8; 1]>, rustc_middle::dep_graph::graph::DepNodeIndex>, false>
        45: rustc_query_impl::query_impl::check_well_formed::execute_query_non_incr::__rust_end_short_backtrace
        46: <rustc_middle::hir::ModuleItems>::par_opaques::<rustc_hir_analysis::check::wfcheck::check_type_wf::{closure#5}>::{closure#0}
        47: <rustc_thread_pool::job::HeapJob<<rustc_thread_pool::scope::Scope>::spawn<rustc_data_structures::sync::parallel::par_slice<&rustc_span::def_id::LocalDefId, rustc_data_structures::sync::parallel::try_par_for_each_in<&[rustc_span::def_id::LocalDefId], rustc_span::ErrorGuaranteed, <rustc_middle::hir::ModuleItems>::par_opaques<rustc_hir_analysis::check::wfcheck::check_type_wf::{closure#5}>::{closure#0}>::{closure#0}::{closure#0}>::{closure#0}::{closure#0}>::{closure#0}> as rustc_thread_pool::job::Job>::execute
        48: <rustc_thread_pool::registry::WorkerThread>::wait_or_steal_until_cold
        49: <rustc_thread_pool::registry::ThreadBuilder>::run
        50: std::sys::backtrace::__rust_begin_short_backtrace::<<rustc_thread_pool::ThreadPoolBuilder>::build_scoped<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#5}::{closure#0}::{closure#0}, rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#5}::{closure#0}::{closure#1}, ()>::{closure#0}::{closure#0}::{closure#0}, ()>
        51: <std::thread::lifecycle::spawn_unchecked<<rustc_thread_pool::ThreadPoolBuilder>::build_scoped<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#5}::{closure#0}::{closure#0}, rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#5}::{closure#0}::{closure#1}, ()>::{closure#0}::{closure#0}::{closure#0}, ()>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
        52: <std::sys::thread::unix::Thread>::new::thread_start
        53: <unknown>
        54: <unknown>
      
 --> /tmp/icemaker_global_tempdir.TJ6O05VzT4z2/rustc_testrunner_tmpdir_reporting.TK0D9OZGm2PI/mvce.rs:4:5
  |
4 |     fn stream(&self) -> impl IntFactory<stream(..): Send>;
  |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

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 1.96.0-nightly (53d60bb1c 2026-03-18) running on x86_64-unknown-linux-gnu

note: compiler flags: -Z crate-attr=feature(min_generic_const_args) -Z threads=8 -Z dump-mir-dir=dir

query stack during panic:
end of query stack