[ICE]: encountered incremental compilation error with explicit_supertraits_containing_assoc_item

rustc-ice-2026-07-05T08_51_53-57170.txt

rustc 1.98.0-nightly (c1b22f4 2026-06-17) running on aarch64-apple-darwin

rustc-ice-2026-07-05T09_10_24-76781.txt

Code

It is crashing in the middle of a refactoring between
ruma/ruma@ecc2c1c

and

<code>

Error output

rror: internal compiler error: encountered incremental compilation error with explicit_supertraits_containing_assoc_item(137b68e953668bf1-3482ce0e2f2d407f)
  |
  = note: please follow the instructions below to create a bug report with the provided information
  = note: for incremental compilation bugs, having a reproduction is vital
  = note: an ideal reproduction consists of the code before and some patch that then triggers the bug when applied and compiled again
  = note: as a workaround, you can run `cargo clean -p ruma_events` or `cargo clean` to allow your project to compile

Backtrace


thread 'rustc' (1727979) panicked at /rustc-dev/c1b22f44c3f30e186b829de95f59740c3a690aba/compiler/rustc_middle/src/verify_ich.rs:82:9:
Found unstable fingerprints for explicit_supertraits_containing_assoc_item(137b68e953668bf1-3482ce0e2f2d407f): EarlyBinder { value: [(Binder { value: TraitPredicate(<Self as std::marker::MetaSized>, polarity:Positive), bound_vars: [] }, crates/ruma-events/src/content.rs:119:1: 125:2 (#14825)), (Binder { value: TraitPredicate(<Self as content::StateEventContent>, polarity:Positive), bound_vars: [] }, crates/ruma-events/src/content.rs:119:36: 119:53 (#0))], .. }
stack backtrace:
   0:        0x109e0cc90 - <<std[5af39319742f7961]::sys::backtrace::BacktraceLock>::print::DisplayBacktrace as core[3e42b1e4cfcbea60]::fmt::Display>::fmt
   1:        0x106c37edc - core[3e42b1e4cfcbea60]::fmt::write
   2:        0x109e23ae8 - <std[5af39319742f7961]::sys::stdio::unix::Stderr as std[5af39319742f7961]::io::Write>::write_fmt
   3:        0x109de278c - std[5af39319742f7961]::panicking::default_hook::{closure#0}
   4:        0x109dfe690 - std[5af39319742f7961]::panicking::default_hook
   5:        0x10790dd48 - std[5af39319742f7961]::panicking::update_hook::<alloc[8c680e8ea9663055]::boxed::Box<rustc_driver_impl[6ae75eebcc8caefb]::install_ice_hook::{closure#1}>>::{closure#0}
   6:        0x109dfe9f4 - std[5af39319742f7961]::panicking::panic_with_hook
   7:        0x109de281c - std[5af39319742f7961]::panicking::panic_handler::{closure#0}
   8:        0x109dd71e8 - std[5af39319742f7961]::sys::backtrace::__rust_end_short_backtrace::<std[5af39319742f7961]::panicking::panic_handler::{closure#0}, !>
   9:        0x109de3df0 - __rustc[a98ed591411b0eff]::rust_begin_unwind
  10:        0x109ec9918 - core[3e42b1e4cfcbea60]::panicking::panic_fmt
  11:        0x109faa604 - rustc_middle[443b26ed13d162fe]::verify_ich::incremental_verify_ich_failed
  12:        0x1091763a8 - rustc_middle[443b26ed13d162fe]::verify_ich::incremental_verify_ich::<rustc_middle[443b26ed13d162fe]::query::erase::ErasedData<[u8; 16usize]>>
  13:        0x109159e1c - rustc_query_impl[2b0801259482cc3c]::execution::try_execute_query::<rustc_middle[443b26ed13d162fe]::query::caches::DefaultCache<(rustc_span[832b073d0bd396ab]::def_id::DefId, rustc_span[832b073d0bd396ab]::symbol::Ident), rustc_middle[443b26ed13d162fe]::query::erase::ErasedData<[u8; 16usize]>>, true>
  14:        0x1092d3c78 - rustc_query_impl[2b0801259482cc3c]::query_impl::explicit_supertraits_containing_assoc_item::execute_query_incr::__rust_end_short_backtrace
  15:        0x107d567b0 - <core[3e42b1e4cfcbea60]::iter::sources::from_fn::FromFn<rustc_infer[21ead556f9994505]::traits::util::transitive_bounds_that_define_assoc_item<core[3e42b1e4cfcbea60]::iter::adapters::filter_map::FilterMap<core[3e42b1e4cfcbea60]::iter::adapters::map::Map<rustc_type_ir[4148a0a812eaa553]::binder::IterIdentityCopied<rustc_middle[443b26ed13d162fe]::ty::context::TyCtxt, &[(rustc_middle[443b26ed13d162fe]::ty::predicate::Clause, rustc_span[832b073d0bd396ab]::span_encoding::Span)]>, <rustc_type_ir[4148a0a812eaa553]::unnormalized::Unnormalized<rustc_middle[443b26ed13d162fe]::ty::context::TyCtxt, (rustc_middle[443b26ed13d162fe]::ty::predicate::Clause, rustc_span[832b073d0bd396ab]::span_encoding::Span)>>::skip_norm_wip>, <dyn rustc_hir_analysis[85566d3dd0c17c95]::hir_ty_lowering::HirTyLowerer>::probe_single_ty_param_bound_for_assoc_item::{closure#0}::{closure#0}::{closure#0}>>::{closure#0}> as core[3e42b1e4cfcbea60]::iter::traits::iterator::Iterator>::next
  16:        0x107bf9ec0 - <dyn rustc_hir_analysis[85566d3dd0c17c95]::hir_ty_lowering::HirTyLowerer>::probe_single_bound_for_assoc_item::<core[3e42b1e4cfcbea60]::iter::sources::from_fn::FromFn<rustc_infer[21ead556f9994505]::traits::util::transitive_bounds_that_define_assoc_item<core[3e42b1e4cfcbea60]::iter::adapters::filter_map::FilterMap<core[3e42b1e4cfcbea60]::iter::adapters::map::Map<rustc_type_ir[4148a0a812eaa553]::binder::IterIdentityCopied<rustc_middle[443b26ed13d162fe]::ty::context::TyCtxt, &[(rustc_middle[443b26ed13d162fe]::ty::predicate::Clause, rustc_span[832b073d0bd396ab]::span_encoding::Span)]>, <rustc_type_ir[4148a0a812eaa553]::unnormalized::Unnormalized<rustc_middle[443b26ed13d162fe]::ty::context::TyCtxt, (rustc_middle[443b26ed13d162fe]::ty::predicate::Clause, rustc_span[832b073d0bd396ab]::span_encoding::Span)>>::skip_norm_wip>, <dyn rustc_hir_analysis[85566d3dd0c17c95]::hir_ty_lowering::HirTyLowerer>::probe_single_ty_param_bound_for_assoc_item::{closure#0}::{closure#0}::{closure#0}>>::{closure#0}>, <dyn rustc_hir_analysis[85566d3dd0c17c95]::hir_ty_lowering::HirTyLowerer>::probe_single_ty_param_bound_for_assoc_item::{closure#0}::{closure#0}>::{closure#0}
  17:        0x107c77b70 - <dyn rustc_hir_analysis[85566d3dd0c17c95]::hir_ty_lowering::HirTyLowerer>::resolve_type_relative_path
  18:        0x107c108c8 - <dyn rustc_hir_analysis[85566d3dd0c17c95]::hir_ty_lowering::HirTyLowerer>::lower_type_relative_path::{closure#0}
  19:        0x107c1423c - <dyn rustc_hir_analysis[85566d3dd0c17c95]::hir_ty_lowering::HirTyLowerer>::lower_type_relative_ty_path::{closure#0}
  20:        0x107c7eb90 - <dyn rustc_hir_analysis[85566d3dd0c17c95]::hir_ty_lowering::HirTyLowerer>::lower_ty
  21:        0x107d1fbd0 - rustc_hir_analysis[85566d3dd0c17c95]::collect::type_of::type_of
  22:        0x1092d630c - rustc_query_impl[2b0801259482cc3c]::query_impl::type_of::invoke_provider_fn::__rust_begin_short_backtrace
  23:        0x1090df0f8 - rustc_query_impl[2b0801259482cc3c]::execution::try_execute_query::<rustc_middle[443b26ed13d162fe]::query::caches::DefIdCache<rustc_middle[443b26ed13d162fe]::query::erase::ErasedData<[u8; 8usize]>>, true>
  24:        0x1092d6284 - rustc_query_impl[2b0801259482cc3c]::query_impl::type_of::execute_query_incr::__rust_end_short_backtrace
  25:        0x107ca9614 - rustc_hir_analysis[85566d3dd0c17c95]::outlives::inferred_outlives_crate
  26:        0x1092c4e50 - rustc_query_impl[2b0801259482cc3c]::query_impl::inferred_outlives_crate::invoke_provider_fn::__rust_begin_short_backtrace
  27:        0x1090ed744 - rustc_query_impl[2b0801259482cc3c]::execution::try_execute_query::<rustc_middle[443b26ed13d162fe]::query::caches::SingleCache<rustc_middle[443b26ed13d162fe]::query::erase::ErasedData<[u8; 8usize]>>, true>
  28:        0x1093ef670 - <rustc_query_impl[2b0801259482cc3c]::dep_kind_vtables::make_dep_kind_vtable_for_query<rustc_query_impl[2b0801259482cc3c]::query_impl::inferred_outlives_crate::VTableGetter>::{closure#0} as core[3e42b1e4cfcbea60]::ops::function::FnOnce<(rustc_middle[443b26ed13d162fe]::ty::context::TyCtxt, rustc_middle[443b26ed13d162fe]::dep_graph::dep_node::DepNode, rustc_middle[443b26ed13d162fe]::dep_graph::serialized::SerializedDepNodeIndex)>>::call_once
  29:        0x10879aecc - <rustc_middle[443b26ed13d162fe]::dep_graph::graph::DepGraphData>::try_mark_previous_green
  30:        0x10879ae5c - <rustc_middle[443b26ed13d162fe]::dep_graph::graph::DepGraphData>::try_mark_previous_green
  31:        0x10879ae5c - <rustc_middle[443b26ed13d162fe]::dep_graph::graph::DepGraphData>::try_mark_previous_green
  32:        0x10879ac08 - <rustc_middle[443b26ed13d162fe]::dep_graph::graph::DepGraphData>::try_mark_green
  33:        0x10916d494 - rustc_query_impl[2b0801259482cc3c]::execution::ensure_can_skip_execution::<rustc_data_structures[58a578a3c89c15bb]::vec_cache::VecCache<rustc_hir_id[4a444372156c027]::OwnerId, rustc_middle[443b26ed13d162fe]::query::erase::ErasedData<[u8; 8usize]>, rustc_middle[443b26ed13d162fe]::dep_graph::graph::DepNodeIndex>>
  34:        0x1092b1690 - rustc_query_impl[2b0801259482cc3c]::query_impl::check_well_formed::execute_query_incr::__rust_end_short_backtrace
  35:        0x107cf5738 - rustc_hir_analysis[85566d3dd0c17c95]::check::wfcheck::check_type_wf
  36:        0x1092a3f48 - rustc_query_impl[2b0801259482cc3c]::query_impl::check_type_wf::invoke_provider_fn::__rust_begin_short_backtrace
  37:        0x1090e84dc - rustc_query_impl[2b0801259482cc3c]::execution::try_execute_query::<rustc_middle[443b26ed13d162fe]::query::caches::SingleCache<rustc_middle[443b26ed13d162fe]::query::erase::ErasedData<[u8; 1usize]>>, true>
  38:        0x1092a3ed0 - rustc_query_impl[2b0801259482cc3c]::query_impl::check_type_wf::execute_query_incr::__rust_end_short_backtrace
  39:        0x107c3784c - rustc_hir_analysis[85566d3dd0c17c95]::check_crate
  40:        0x10833ec88 - rustc_interface[e15c46fb2942de73]::passes::analysis
  41:        0x1090e2eb0 - rustc_query_impl[2b0801259482cc3c]::execution::try_execute_query::<rustc_middle[443b26ed13d162fe]::query::caches::SingleCache<rustc_middle[443b26ed13d162fe]::query::erase::ErasedData<[u8; 0usize]>>, true>
  42:        0x1092d653c - rustc_query_impl[2b0801259482cc3c]::query_impl::analysis::execute_query_incr::__rust_end_short_backtrace
  43:        0x1079017ec - rustc_interface[e15c46fb2942de73]::passes::create_and_enter_global_ctxt::<core[3e42b1e4cfcbea60]::option::Option<rustc_interface[e15c46fb2942de73]::queries::Linker>, rustc_driver_impl[6ae75eebcc8caefb]::run_compiler::{closure#0}::{closure#2}>
  44:        0x1079111d4 - rustc_interface[e15c46fb2942de73]::interface::run_compiler::<(), rustc_driver_impl[6ae75eebcc8caefb]::run_compiler::{closure#0}>::{closure#1}
  45:        0x107906d7c - std[5af39319742f7961]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[e15c46fb2942de73]::util::run_in_thread_with_globals<rustc_interface[e15c46fb2942de73]::util::run_in_thread_pool_with_globals<rustc_interface[e15c46fb2942de73]::interface::run_compiler<(), rustc_driver_impl[6ae75eebcc8caefb]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
  46:        0x107916844 - <std[5af39319742f7961]::thread::lifecycle::spawn_unchecked<rustc_interface[e15c46fb2942de73]::util::run_in_thread_with_globals<rustc_interface[e15c46fb2942de73]::util::run_in_thread_pool_with_globals<rustc_interface[e15c46fb2942de73]::interface::run_compiler<(), rustc_driver_impl[6ae75eebcc8caefb]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core[3e42b1e4cfcbea60]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  47:        0x109e09750 - <std[5af39319742f7961]::sys::thread::unix::Thread>::new::thread_start
  48:        0x1852adc58 - __pthread_cond_wait

This should be a duplicate of #158093, which is already fixed on nightly. Could you try with a nightly that contains the fix #158122, which started being available on june 20's nightly, and let us know if it's indeed already fixed?

Closing as duplicate, it would be nice to have this feedback but it seems unlikely we get it.

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[ICE]: encountered incremental compilation error with explicit_supertraits_containing_assoc_item #158805

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[ICE]: encountered incremental compilation error with explicit_supertraits_containing_assoc_item #158805

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lqd commented on Jul 6, 2026

workingjubilee commented on Nov 10, 2026

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