ICE / Hang found DefPathHash collision between DefPath

[matthiaskrgr]

Code

trait Trait {}

trait Bar {
    fn method() -> impl Sized;
    async fn method() -> Result<(), ()>;

}

fn foo<T: Trait<method(): Send>>(hc: HC) {
    needs_trait(T::method());
}

fn main() {}

Meta

rustc --version --verbose:

rustc 1.88.0-nightly (197387201 2025-05-08)
binary: rustc
commit-hash: 19738720130a82959acd4fc45259166262f3ffbe
commit-date: 2025-05-08
host: x86_64-unknown-linux-gnu
release: 1.88.0-nightly
LLVM version: 20.1.4

Error output

<output>

Backtrace

thread 'rustc' panicked at compiler/rustc_hir/src/definitions.rs:70:13:
found DefPathHash collision between DefPath {
    data: [
        DisambiguatedDefPathData {
            data: TypeNs(
                "Bar",
            ),
            disambiguator: 0,
        },
        DisambiguatedDefPathData {
            data: AnonAssocTy(
                "method",
            ),
            disambiguator: 0,
        },
    ],
    krate: crate0,
} and DefPath {
    data: [
        DisambiguatedDefPathData {
            data: TypeNs(
                "Bar",
            ),
            disambiguator: 0,
        },
        DisambiguatedDefPathData {
            data: AnonAssocTy(
                "method",
            ),
            disambiguator: 0,
        },
    ],
    krate: crate0,
}. Compilation cannot continue.
stack backtrace:
   0:     0x762dc5163e43 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::hc8e098b1215e964e
   1:     0x762dc5805c07 - core::fmt::write::h583ed6c83f41a855
   2:     0x762dc6870c51 - std::io::Write::write_fmt::h8f81fb06e9e8fee1
   3:     0x762dc5163ca2 - std::sys::backtrace::BacktraceLock::print::hecc1a51ebe0490cf
   4:     0x762dc516789a - std::panicking::default_hook::{{closure}}::hf1f4c4a76c9c89ad
   5:     0x762dc516741f - std::panicking::default_hook::h7712de3badaf8d92
   6:     0x762dc4196713 - std[2ecd24cfd14e710f]::panicking::update_hook::<alloc[e7a013d2a582f25b]::boxed::Box<rustc_driver_impl[fe7810e6b574cb6f]::install_ice_hook::{closure#1}>>::{closure#0}
   7:     0x762dc5168113 - std::panicking::rust_panic_with_hook::ha5dc533cf5e3a0f0
   8:     0x762dc5167e0a - std::panicking::begin_panic_handler::{{closure}}::hd42e1b8311c9abcd
   9:     0x762dc5164319 - std::sys::backtrace::__rust_end_short_backtrace::h50dffba308434e81
  10:     0x762dc5167acd - __rustc[9792d8baf3412558]::rust_begin_unwind
  11:     0x762dc1a865a0 - core::panicking::panic_fmt::h1084ef89c29b9bac
  12:     0x762dc5f28218 - <rustc_middle[e2e735cb73dc82a4]::ty::context::TyCtxt>::create_def
  13:     0x762dc5f24540 - <rustc_middle[e2e735cb73dc82a4]::query::plumbing::TyCtxtAt>::create_def
  14:     0x762dc50e64c6 - rustc_ty_utils[28f493a60bf9b3f4]::assoc::associated_type_for_impl_trait_in_trait
  15:     0x762dc4c48d67 - rustc_query_impl[c45186fe25608a11]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[c45186fe25608a11]::query_impl::associated_type_for_impl_trait_in_trait::dynamic_query::{closure#2}::{closure#0}, rustc_middle[e2e735cb73dc82a4]::query::erase::Erased<[u8; 4usize]>>
  16:     0x762dc6800e87 - rustc_query_system[3aace006589e2dcc]::query::plumbing::try_execute_query::<rustc_query_impl[c45186fe25608a11]::DynamicConfig<rustc_data_structures[ad9c7fd2490c2e66]::vec_cache::VecCache<rustc_span[8bbfce921ca97f76]::def_id::CrateNum, rustc_middle[e2e735cb73dc82a4]::query::erase::Erased<[u8; 4usize]>, rustc_query_system[3aace006589e2dcc]::dep_graph::graph::DepNodeIndex>, false, false, false>, rustc_query_impl[c45186fe25608a11]::plumbing::QueryCtxt, false>
  17:     0x762dc4c582b0 - rustc_query_impl[c45186fe25608a11]::query_impl::associated_type_for_impl_trait_in_trait::get_query_non_incr::__rust_end_short_backtrace
  18:     0x762dc50e6074 - rustc_ty_utils[28f493a60bf9b3f4]::assoc::associated_types_for_impl_traits_in_associated_fn::{closure#0}
  19:     0x762dc60f79b6 - rustc_ty_utils[28f493a60bf9b3f4]::assoc::associated_types_for_impl_traits_in_associated_fn
  20:     0x762dc60f716c - rustc_query_impl[c45186fe25608a11]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[c45186fe25608a11]::query_impl::associated_types_for_impl_traits_in_associated_fn::dynamic_query::{closure#2}::{closure#0}, rustc_middle[e2e735cb73dc82a4]::query::erase::Erased<[u8; 16usize]>>
  21:     0x762dc60f711b - <rustc_query_impl[c45186fe25608a11]::query_impl::associated_types_for_impl_traits_in_associated_fn::dynamic_query::{closure#2} as core[55677b73b6e313f4]::ops::function::FnOnce<(rustc_middle[e2e735cb73dc82a4]::ty::context::TyCtxt, rustc_span[8bbfce921ca97f76]::def_id::DefId)>>::call_once
  22:     0x762dc59d4392 - rustc_query_system[3aace006589e2dcc]::query::plumbing::try_execute_query::<rustc_query_impl[c45186fe25608a11]::DynamicConfig<rustc_query_system[3aace006589e2dcc]::query::caches::DefIdCache<rustc_middle[e2e735cb73dc82a4]::query::erase::Erased<[u8; 16usize]>>, false, false, false>, rustc_query_impl[c45186fe25608a11]::plumbing::QueryCtxt, false>
  23:     0x762dc59d3b65 - rustc_query_impl[c45186fe25608a11]::query_impl::associated_types_for_impl_traits_in_associated_fn::get_query_non_incr::__rust_end_short_backtrace
  24:     0x762dc67e651e - <core[55677b73b6e313f4]::iter::adapters::GenericShunt<core[55677b73b6e313f4]::iter::adapters::map::Map<core[55677b73b6e313f4]::iter::adapters::chain::Chain<core[55677b73b6e313f4]::iter::adapters::map::Map<core[55677b73b6e313f4]::slice::iter::Iter<rustc_hir[278d1db56afd1710]::hir::TraitItemRef>, rustc_ty_utils[28f493a60bf9b3f4]::assoc::associated_item_def_ids::{closure#0}>, core[55677b73b6e313f4]::iter::adapters::copied::Copied<core[55677b73b6e313f4]::iter::adapters::flatten::FlatMap<core[55677b73b6e313f4]::iter::adapters::filter::Filter<core[55677b73b6e313f4]::slice::iter::Iter<rustc_hir[278d1db56afd1710]::hir::TraitItemRef>, rustc_ty_utils[28f493a60bf9b3f4]::assoc::associated_item_def_ids::{closure#1}>, &[rustc_span[8bbfce921ca97f76]::def_id::DefId], rustc_ty_utils[28f493a60bf9b3f4]::assoc::associated_item_def_ids::{closure#2}>>>, core[55677b73b6e313f4]::result::Result<rustc_span[8bbfce921ca97f76]::def_id::DefId, !>::Ok>, core[55677b73b6e313f4]::result::Result<core[55677b73b6e313f4]::convert::Infallible, !>> as core[55677b73b6e313f4]::iter::traits::iterator::Iterator>::next
  25:     0x762dc67e6190 - rustc_arena[716ee9466ebd5572]::outline::<<rustc_arena[716ee9466ebd5572]::DroplessArena>::alloc_from_iter<rustc_span[8bbfce921ca97f76]::def_id::DefId, core[55677b73b6e313f4]::iter::adapters::chain::Chain<core[55677b73b6e313f4]::iter::adapters::map::Map<core[55677b73b6e313f4]::slice::iter::Iter<rustc_hir[278d1db56afd1710]::hir::TraitItemRef>, rustc_ty_utils[28f493a60bf9b3f4]::assoc::associated_item_def_ids::{closure#0}>, core[55677b73b6e313f4]::iter::adapters::copied::Copied<core[55677b73b6e313f4]::iter::adapters::flatten::FlatMap<core[55677b73b6e313f4]::iter::adapters::filter::Filter<core[55677b73b6e313f4]::slice::iter::Iter<rustc_hir[278d1db56afd1710]::hir::TraitItemRef>, rustc_ty_utils[28f493a60bf9b3f4]::assoc::associated_item_def_ids::{closure#1}>, &[rustc_span[8bbfce921ca97f76]::def_id::DefId], rustc_ty_utils[28f493a60bf9b3f4]::assoc::associated_item_def_ids::{closure#2}>>>>::{closure#0}, &mut [rustc_span[8bbfce921ca97f76]::def_id::DefId]>
  26:     0x762dc6da07c8 - rustc_ty_utils[28f493a60bf9b3f4]::assoc::associated_item_def_ids.warm
  27:     0x762dc59d2de9 - rustc_query_impl[c45186fe25608a11]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[c45186fe25608a11]::query_impl::associated_item_def_ids::dynamic_query::{closure#2}::{closure#0}, rustc_middle[e2e735cb73dc82a4]::query::erase::Erased<[u8; 16usize]>>
  28:     0x762dc59d2da9 - <rustc_query_impl[c45186fe25608a11]::query_impl::associated_item_def_ids::dynamic_query::{closure#2} as core[55677b73b6e313f4]::ops::function::FnOnce<(rustc_middle[e2e735cb73dc82a4]::ty::context::TyCtxt, rustc_span[8bbfce921ca97f76]::def_id::DefId)>>::call_once
  29:     0x762dc59d4392 - rustc_query_system[3aace006589e2dcc]::query::plumbing::try_execute_query::<rustc_query_impl[c45186fe25608a11]::DynamicConfig<rustc_query_system[3aace006589e2dcc]::query::caches::DefIdCache<rustc_middle[e2e735cb73dc82a4]::query::erase::Erased<[u8; 16usize]>>, false, false, false>, rustc_query_impl[c45186fe25608a11]::plumbing::QueryCtxt, false>
  30:     0x762dc59d3df5 - rustc_query_impl[c45186fe25608a11]::query_impl::associated_item_def_ids::get_query_non_incr::__rust_end_short_backtrace
  31:     0x762dc5a04e9c - rustc_ty_utils[28f493a60bf9b3f4]::assoc::associated_items
  32:     0x762dc5a04bf2 - rustc_query_impl[c45186fe25608a11]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[c45186fe25608a11]::query_impl::associated_items::dynamic_query::{closure#2}::{closure#0}, rustc_middle[e2e735cb73dc82a4]::query::erase::Erased<[u8; 8usize]>>
  33:     0x762dc5c3beff - rustc_query_system[3aace006589e2dcc]::query::plumbing::try_execute_query::<rustc_query_impl[c45186fe25608a11]::DynamicConfig<rustc_query_system[3aace006589e2dcc]::query::caches::DefIdCache<rustc_middle[e2e735cb73dc82a4]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[c45186fe25608a11]::plumbing::QueryCtxt, false>
  34:     0x762dc5c3b180 - rustc_query_impl[c45186fe25608a11]::query_impl::associated_items::get_query_non_incr::__rust_end_short_backtrace
  35:     0x762dc606a177 - <rustc_hir_analysis[bcdf7bec670f0d1f]::collect::CollectItemTypesVisitor as rustc_hir[278d1db56afd1710]::intravisit::Visitor>::visit_item
  36:     0x762dc605f7b7 - rustc_hir_analysis[bcdf7bec670f0d1f]::check::wfcheck::check_well_formed
  37:     0x762dc605f5cb - rustc_query_impl[c45186fe25608a11]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[c45186fe25608a11]::query_impl::check_well_formed::dynamic_query::{closure#2}::{closure#0}, rustc_middle[e2e735cb73dc82a4]::query::erase::Erased<[u8; 1usize]>>
  38:     0x762dc605ee71 - rustc_query_system[3aace006589e2dcc]::query::plumbing::try_execute_query::<rustc_query_impl[c45186fe25608a11]::DynamicConfig<rustc_data_structures[ad9c7fd2490c2e66]::vec_cache::VecCache<rustc_span[8bbfce921ca97f76]::def_id::LocalDefId, rustc_middle[e2e735cb73dc82a4]::query::erase::Erased<[u8; 1usize]>, rustc_query_system[3aace006589e2dcc]::dep_graph::graph::DepNodeIndex>, false, false, false>, rustc_query_impl[c45186fe25608a11]::plumbing::QueryCtxt, false>
  39:     0x762dc605e966 - rustc_query_impl[c45186fe25608a11]::query_impl::check_well_formed::get_query_non_incr::__rust_end_short_backtrace
  40:     0x762dc605bee5 - rustc_hir_analysis[bcdf7bec670f0d1f]::check::wfcheck::check_mod_type_wf
  41:     0x762dc605bcdf - rustc_query_impl[c45186fe25608a11]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[c45186fe25608a11]::query_impl::check_mod_type_wf::dynamic_query::{closure#2}::{closure#0}, rustc_middle[e2e735cb73dc82a4]::query::erase::Erased<[u8; 1usize]>>
  42:     0x762dc67f8484 - rustc_query_system[3aace006589e2dcc]::query::plumbing::try_execute_query::<rustc_query_impl[c45186fe25608a11]::DynamicConfig<rustc_query_system[3aace006589e2dcc]::query::caches::DefaultCache<rustc_span[8bbfce921ca97f76]::def_id::LocalModDefId, rustc_middle[e2e735cb73dc82a4]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[c45186fe25608a11]::plumbing::QueryCtxt, false>
  43:     0x762dc67f8211 - rustc_query_impl[c45186fe25608a11]::query_impl::check_mod_type_wf::get_query_non_incr::__rust_end_short_backtrace
  44:     0x762dc5a8f532 - rustc_hir_analysis[bcdf7bec670f0d1f]::check_crate
  45:     0x762dc5ccf937 - rustc_interface[38b8f1283a6cda7d]::passes::run_required_analyses
  46:     0x762dc67f949e - rustc_interface[38b8f1283a6cda7d]::passes::analysis
  47:     0x762dc67f9475 - rustc_query_impl[c45186fe25608a11]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[c45186fe25608a11]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[e2e735cb73dc82a4]::query::erase::Erased<[u8; 0usize]>>
  48:     0x762dc674c3ba - rustc_query_system[3aace006589e2dcc]::query::plumbing::try_execute_query::<rustc_query_impl[c45186fe25608a11]::DynamicConfig<rustc_query_system[3aace006589e2dcc]::query::caches::SingleCache<rustc_middle[e2e735cb73dc82a4]::query::erase::Erased<[u8; 0usize]>>, false, false, false>, rustc_query_impl[c45186fe25608a11]::plumbing::QueryCtxt, false>
  49:     0x762dc674c08f - rustc_query_impl[c45186fe25608a11]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  50:     0x762dc69bdfc7 - rustc_interface[38b8f1283a6cda7d]::passes::create_and_enter_global_ctxt::<core[55677b73b6e313f4]::option::Option<rustc_interface[38b8f1283a6cda7d]::queries::Linker>, rustc_driver_impl[fe7810e6b574cb6f]::run_compiler::{closure#0}::{closure#2}>::{closure#2}::{closure#0}
  51:     0x762dc68b81e6 - rustc_interface[38b8f1283a6cda7d]::interface::run_compiler::<(), rustc_driver_impl[fe7810e6b574cb6f]::run_compiler::{closure#0}>::{closure#1}
  52:     0x762dc686a83e - std[2ecd24cfd14e710f]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[38b8f1283a6cda7d]::util::run_in_thread_with_globals<rustc_interface[38b8f1283a6cda7d]::util::run_in_thread_pool_with_globals<rustc_interface[38b8f1283a6cda7d]::interface::run_compiler<(), rustc_driver_impl[fe7810e6b574cb6f]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
  53:     0x762dc686acb4 - <<std[2ecd24cfd14e710f]::thread::Builder>::spawn_unchecked_<rustc_interface[38b8f1283a6cda7d]::util::run_in_thread_with_globals<rustc_interface[38b8f1283a6cda7d]::util::run_in_thread_pool_with_globals<rustc_interface[38b8f1283a6cda7d]::interface::run_compiler<(), rustc_driver_impl[fe7810e6b574cb6f]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core[55677b73b6e313f4]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  54:     0x762dc686c0ab - std::sys::pal::unix::thread::Thread::new::thread_start::hdd6937c40f2a7b3a
  55:     0x762dc06a370a - <unknown>
  56:     0x762dc0727aac - <unknown>
  57:                0x0 - <unknown>

error: 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: please make sure that you have updated to the latest nightly

note: please attach the file at `/tmp/im/rustc-ice-2025-05-08T11_30_15-646177.txt` to your bug report

query stack during panic:
<HANG>

[matthiaskrgr]

cc @Zoxc

[cyrgani]

trait Bar {
    fn method() -> impl Sized;
    fn method() -> impl Sized;
}

fn main() {}

@rustbot label S-has-mcve

[moxian]

(bisects to #140453)