[ICE]: encountered incremental compilation error with explicit_supertraits_containing_assoc_item

[BillCarsonFr]

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

ice_diff.patch

<code>

Meta

rustc --version --verbose:

rustc 1.98.0-nightly (c1b22f44c 2026-06-17)
binary: rustc
commit-hash: c1b22f44c3f30e186b829de95f59740c3a690aba
commit-date: 2026-06-17
host: aarch64-apple-darwin
release: 1.98.0-nightly
LLVM version: 22.1.7

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

[lqd]

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?