Rustdoc ICE futures-util compiler/rustc_infer/src/infer/generalize.rs:28:40: unwrap_err on Ok(?11t)

[kpreid]

Code

cargo +nightly doc -p [email protected]

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rustc --version --verbose:

rustc 1.76.0-nightly (1fdfe1234 2023-12-06)
binary: rustc
commit-hash: 1fdfe1234795a289af1088aefa92ef80191cb611
commit-date: 2023-12-06
host: x86_64-apple-darwin
release: 1.76.0-nightly
LLVM version: 17.0.5

Error output

thread 'rustc' panicked at compiler/rustc_infer/src/infer/generalize.rs:28:40:
called `Result::unwrap_err()` on an `Ok` value: ?11t

Backtrace

stack backtrace:
   0:        0x10f2ee0cb - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h2d0631316f3b5583
   1:        0x10f33a713 - core::fmt::write::h20c333a0d6e9fed4
   2:        0x10f2e44de - std::io::Write::write_fmt::ha8a591fe7c497304
   3:        0x10f2edea9 - std::sys_common::backtrace::print::h1f16fa78c263066c
   4:        0x10f2f1075 - std::panicking::default_hook::{{closure}}::h2e9c57d4d629dce8
   5:        0x10f2f0df4 - std::panicking::default_hook::h82619bbff7e5ef6e
   6:        0x11c8a188e - <alloc[2b175870aad3dc26]::boxed::Box<rustc_driver_impl[f96734878b84dfcd]::install_ice_hook::{closure#0}> as core[5d41cd2285a1e1cc]::ops::function::Fn<(&dyn for<'a, 'b> core[5d41cd2285a1e1cc]::ops::function::Fn<(&'a core[5d41cd2285a1e1cc]::panic::panic_info::PanicInfo<'b>,), Output = ()> + core[5d41cd2285a1e1cc]::marker::Sync + core[5d41cd2285a1e1cc]::marker::Send, &core[5d41cd2285a1e1cc]::panic::panic_info::PanicInfo)>>::call
   7:        0x10f2f1715 - std::panicking::rust_panic_with_hook::hf4389b5e0225aae1
   8:        0x10f2f14ae - std::panicking::begin_panic_handler::{{closure}}::h0bf848784eb62eb8
   9:        0x10f2ee5a9 - std::sys_common::backtrace::__rust_end_short_backtrace::h2c21727987e02008
  10:        0x10f2f1202 - _rust_begin_unwind
  11:        0x10f356b55 - core::panicking::panic_fmt::he0f1b97008b366aa
  12:        0x10f357175 - core::result::unwrap_failed::h21a3a8f24550a734
  13:        0x11d0535a7 - rustc_infer[592299c261c2d420]::infer::generalize::generalize::<rustc_infer[592299c261c2d420]::infer::generalize::CombineDelegate, rustc_middle[e576d51c83bb1f18]::ty::Ty, rustc_type_ir[f5370dad05bceabf]::ty_kind::TyVid>
  14:        0x11cfa6a4b - <rustc_infer[592299c261c2d420]::infer::combine::CombineFields>::instantiate
  15:        0x11cf84af4 - <rustc_infer[592299c261c2d420]::infer::equate::Equate as rustc_middle[e576d51c83bb1f18]::ty::relate::TypeRelation>::tys
  16:        0x11e50aa53 - <rustc_middle[e576d51c83bb1f18]::ty::generic_args::GenericArg as rustc_middle[e576d51c83bb1f18]::ty::relate::Relate>::relate::<rustc_infer[592299c261c2d420]::infer::equate::Equate>
  17:        0x11e3a3e97 - <core[5d41cd2285a1e1cc]::result::Result<rustc_middle[e576d51c83bb1f18]::ty::generic_args::GenericArg, rustc_middle[e576d51c83bb1f18]::ty::error::TypeError> as rustc_type_ir[f5370dad05bceabf]::interner::CollectAndApply<rustc_middle[e576d51c83bb1f18]::ty::generic_args::GenericArg, &rustc_middle[e576d51c83bb1f18]::ty::list::List<rustc_middle[e576d51c83bb1f18]::ty::generic_args::GenericArg>>>::collect_and_apply::<core[5d41cd2285a1e1cc]::iter::adapters::map::Map<core[5d41cd2285a1e1cc]::iter::adapters::zip::Zip<core[5d41cd2285a1e1cc]::iter::adapters::copied::Copied<core[5d41cd2285a1e1cc]::slice::iter::Iter<rustc_middle[e576d51c83bb1f18]::ty::generic_args::GenericArg>>, core[5d41cd2285a1e1cc]::iter::adapters::copied::Copied<core[5d41cd2285a1e1cc]::slice::iter::Iter<rustc_middle[e576d51c83bb1f18]::ty::generic_args::GenericArg>>>, rustc_middle[e576d51c83bb1f18]::ty::relate::relate_args_invariantly<rustc_infer[592299c261c2d420]::infer::sub::Sub>::{closure#0}>, <rustc_middle[e576d51c83bb1f18]::ty::context::TyCtxt>::mk_args_from_iter<core[5d41cd2285a1e1cc]::iter::adapters::map::Map<core[5d41cd2285a1e1cc]::iter::adapters::zip::Zip<core[5d41cd2285a1e1cc]::iter::adapters::copied::Copied<core[5d41cd2285a1e1cc]::slice::iter::Iter<rustc_middle[e576d51c83bb1f18]::ty::generic_args::GenericArg>>, core[5d41cd2285a1e1cc]::iter::adapters::copied::Copied<core[5d41cd2285a1e1cc]::slice::iter::Iter<rustc_middle[e576d51c83bb1f18]::ty::generic_args::GenericArg>>>, rustc_middle[e576d51c83bb1f18]::ty::relate::relate_args_invariantly<rustc_infer[592299c261c2d420]::infer::sub::Sub>::{closure#0}>, core[5d41cd2285a1e1cc]::result::Result<rustc_middle[e576d51c83bb1f18]::ty::generic_args::GenericArg, rustc_middle[e576d51c83bb1f18]::ty::error::TypeError>>::{closure#0}>
  18:        0x11e53a7b6 - <rustc_infer[592299c261c2d420]::infer::combine::CombineFields>::higher_ranked_sub::<rustc_middle[e576d51c83bb1f18]::ty::sty::TraitRef>
  19:        0x11e4818f9 - <rustc_infer[592299c261c2d420]::infer::InferCtxt>::commit_if_ok::<rustc_infer[592299c261c2d420]::infer::InferOk<()>, rustc_middle[e576d51c83bb1f18]::ty::error::TypeError, <rustc_infer[592299c261c2d420]::infer::at::Trace>::sub<rustc_middle[e576d51c83bb1f18]::ty::sty::Binder<rustc_middle[e576d51c83bb1f18]::ty::sty::TraitRef>>::{closure#0}>
  20:        0x11e33941e - <rustc_trait_selection[1258e9116b31c3d0]::traits::select::SelectionContext>::match_where_clause_trait_ref
  21:        0x11e48cdb7 - <rustc_infer[592299c261c2d420]::infer::InferCtxt>::probe::<core[5d41cd2285a1e1cc]::result::Result<rustc_middle[e576d51c83bb1f18]::traits::select::EvaluationResult, rustc_middle[e576d51c83bb1f18]::traits::select::OverflowError>, <rustc_trait_selection[1258e9116b31c3d0]::traits::select::SelectionContext>::evaluation_probe<<rustc_trait_selection[1258e9116b31c3d0]::traits::select::SelectionContext>::where_clause_may_apply::{closure#0}>::{closure#0}>
  22:        0x11e33aa19 - <rustc_trait_selection[1258e9116b31c3d0]::traits::select::SelectionContext>::assemble_candidates_from_caller_bounds
  23:        0x11e339f9a - <rustc_trait_selection[1258e9116b31c3d0]::traits::select::SelectionContext>::assemble_candidates
  24:        0x11e334e26 - <rustc_trait_selection[1258e9116b31c3d0]::traits::select::SelectionContext>::in_task::<<rustc_trait_selection[1258e9116b31c3d0]::traits::select::SelectionContext>::candidate_from_obligation::{closure#0}::{closure#0}, core[5d41cd2285a1e1cc]::result::Result<core[5d41cd2285a1e1cc]::option::Option<rustc_middle[e576d51c83bb1f18]::traits::select::SelectionCandidate>, rustc_middle[e576d51c83bb1f18]::traits::SelectionError>>::{closure#0}
  25:        0x11e3439bd - <rustc_trait_selection[1258e9116b31c3d0]::traits::select::SelectionContext>::candidate_from_obligation
  26:        0x11e343257 - <rustc_trait_selection[1258e9116b31c3d0]::traits::select::SelectionContext>::poly_select
  27:        0x11e334c52 - <rustc_trait_selection[1258e9116b31c3d0]::traits::select::SelectionContext>::select
  28:        0x11e483686 - <rustc_infer[592299c261c2d420]::infer::InferCtxt>::commit_if_ok::<(), (), rustc_trait_selection[1258e9116b31c3d0]::traits::project::assemble_candidates_from_impls::{closure#0}>
  29:        0x11e37ab4e - rustc_trait_selection[1258e9116b31c3d0]::traits::project::project
  30:        0x11e378397 - rustc_trait_selection[1258e9116b31c3d0]::traits::project::opt_normalize_projection_type
  31:        0x11e3754e7 - rustc_trait_selection[1258e9116b31c3d0]::traits::project::project_and_unify_type
  32:        0x11e4831e9 - <rustc_infer[592299c261c2d420]::infer::InferCtxt>::commit_if_ok::<rustc_trait_selection[1258e9116b31c3d0]::traits::project::ProjectAndUnifyResult, rustc_infer[592299c261c2d420]::traits::project::MismatchedProjectionTypes, rustc_trait_selection[1258e9116b31c3d0]::traits::project::poly_project_and_unify_type::{closure#0}>
  33:        0x11e37541f - rustc_trait_selection[1258e9116b31c3d0]::traits::project::poly_project_and_unify_type
  34:        0x11e3460d2 - <rustc_trait_selection[1258e9116b31c3d0]::traits::select::SelectionContext>::evaluate_predicate_recursively
  35:        0x11e3454e2 - <rustc_trait_selection[1258e9116b31c3d0]::traits::select::SelectionContext>::evaluate_predicates_recursively::<alloc[2b175870aad3dc26]::vec::Vec<rustc_infer[592299c261c2d420]::traits::Obligation<rustc_middle[e576d51c83bb1f18]::ty::Predicate>>>
  36:        0x11e3461f3 - <rustc_trait_selection[1258e9116b31c3d0]::traits::select::SelectionContext>::evaluate_predicate_recursively
  37:        0x11e3454e2 - <rustc_trait_selection[1258e9116b31c3d0]::traits::select::SelectionContext>::evaluate_predicates_recursively::<alloc[2b175870aad3dc26]::vec::Vec<rustc_infer[592299c261c2d420]::traits::Obligation<rustc_middle[e576d51c83bb1f18]::ty::Predicate>>>
  38:        0x11e48cde9 - <rustc_infer[592299c261c2d420]::infer::InferCtxt>::probe::<core[5d41cd2285a1e1cc]::result::Result<rustc_middle[e576d51c83bb1f18]::traits::select::EvaluationResult, rustc_middle[e576d51c83bb1f18]::traits::select::OverflowError>, <rustc_trait_selection[1258e9116b31c3d0]::traits::select::SelectionContext>::evaluation_probe<<rustc_trait_selection[1258e9116b31c3d0]::traits::select::SelectionContext>::where_clause_may_apply::{closure#0}>::{closure#0}>
  39:        0x11e33aa19 - <rustc_trait_selection[1258e9116b31c3d0]::traits::select::SelectionContext>::assemble_candidates_from_caller_bounds
  40:        0x11e339f9a - <rustc_trait_selection[1258e9116b31c3d0]::traits::select::SelectionContext>::assemble_candidates
  41:        0x11e334e26 - <rustc_trait_selection[1258e9116b31c3d0]::traits::select::SelectionContext>::in_task::<<rustc_trait_selection[1258e9116b31c3d0]::traits::select::SelectionContext>::candidate_from_obligation::{closure#0}::{closure#0}, core[5d41cd2285a1e1cc]::result::Result<core[5d41cd2285a1e1cc]::option::Option<rustc_middle[e576d51c83bb1f18]::traits::select::SelectionCandidate>, rustc_middle[e576d51c83bb1f18]::traits::SelectionError>>::{closure#0}
  42:        0x11e3439bd - <rustc_trait_selection[1258e9116b31c3d0]::traits::select::SelectionContext>::candidate_from_obligation
  43:        0x11e343257 - <rustc_trait_selection[1258e9116b31c3d0]::traits::select::SelectionContext>::poly_select
  44:        0x11e334c52 - <rustc_trait_selection[1258e9116b31c3d0]::traits::select::SelectionContext>::select
  45:        0x11e483686 - <rustc_infer[592299c261c2d420]::infer::InferCtxt>::commit_if_ok::<(), (), rustc_trait_selection[1258e9116b31c3d0]::traits::project::assemble_candidates_from_impls::{closure#0}>
  46:        0x11e37ab4e - rustc_trait_selection[1258e9116b31c3d0]::traits::project::project
  47:        0x11e378397 - rustc_trait_selection[1258e9116b31c3d0]::traits::project::opt_normalize_projection_type
  48:        0x11e370186 - rustc_trait_selection[1258e9116b31c3d0]::traits::project::normalize_projection_type
  49:        0x11e36ec48 - <rustc_trait_selection[1258e9116b31c3d0]::traits::project::AssocTypeNormalizer as rustc_type_ir[f5370dad05bceabf]::fold::TypeFolder<rustc_middle[e576d51c83bb1f18]::ty::context::TyCtxt>>::fold_ty
  50:        0x11e3959b0 - rustc_middle[e576d51c83bb1f18]::ty::util::fold_list::<rustc_trait_selection[1258e9116b31c3d0]::traits::project::AssocTypeNormalizer, rustc_middle[e576d51c83bb1f18]::ty::generic_args::GenericArg, <&rustc_middle[e576d51c83bb1f18]::ty::list::List<rustc_middle[e576d51c83bb1f18]::ty::generic_args::GenericArg> as rustc_type_ir[f5370dad05bceabf]::fold::TypeFoldable<rustc_middle[e576d51c83bb1f18]::ty::context::TyCtxt>>::try_fold_with<rustc_trait_selection[1258e9116b31c3d0]::traits::project::AssocTypeNormalizer>::{closure#0}>
  51:        0x11e35d601 - <rustc_type_ir[f5370dad05bceabf]::predicate_kind::PredicateKind<rustc_middle[e576d51c83bb1f18]::ty::context::TyCtxt> as rustc_type_ir[f5370dad05bceabf]::fold::TypeFoldable<rustc_middle[e576d51c83bb1f18]::ty::context::TyCtxt>>::try_fold_with::<rustc_trait_selection[1258e9116b31c3d0]::traits::project::AssocTypeNormalizer>
  52:        0x11e36dbe3 - <rustc_trait_selection[1258e9116b31c3d0]::traits::project::AssocTypeNormalizer>::fold::<rustc_middle[e576d51c83bb1f18]::ty::Clause>
  53:        0x11e376769 - rustc_trait_selection[1258e9116b31c3d0]::traits::project::normalize_with_depth_to::<rustc_middle[e576d51c83bb1f18]::ty::Clause>
  54:        0x11e34a65a - <rustc_trait_selection[1258e9116b31c3d0]::traits::select::SelectionContext>::impl_or_trait_obligations
  55:        0x11e33e3c8 - <rustc_trait_selection[1258e9116b31c3d0]::traits::select::SelectionContext>::confirm_candidate
  56:        0x11e48c950 - <rustc_infer[592299c261c2d420]::infer::InferCtxt>::probe::<core[5d41cd2285a1e1cc]::result::Result<rustc_middle[e576d51c83bb1f18]::traits::select::EvaluationResult, rustc_middle[e576d51c83bb1f18]::traits::select::OverflowError>, <rustc_trait_selection[1258e9116b31c3d0]::traits::select::SelectionContext>::evaluation_probe<<rustc_trait_selection[1258e9116b31c3d0]::traits::select::SelectionContext>::evaluate_candidate::{closure#0}::{closure#0}>::{closure#0}>
  57:        0x11e4eea00 - <core[5d41cd2285a1e1cc]::iter::adapters::map::Map<core[5d41cd2285a1e1cc]::iter::adapters::map::Map<alloc[2b175870aad3dc26]::vec::into_iter::IntoIter<rustc_middle[e576d51c83bb1f18]::traits::select::SelectionCandidate>, <rustc_trait_selection[1258e9116b31c3d0]::traits::select::SelectionContext>::candidate_from_obligation_no_cache::{closure#1}>, <core[5d41cd2285a1e1cc]::result::Result<core[5d41cd2285a1e1cc]::option::Option<rustc_trait_selection[1258e9116b31c3d0]::traits::select::EvaluatedCandidate>, rustc_middle[e576d51c83bb1f18]::traits::SelectionError>>::transpose> as core[5d41cd2285a1e1cc]::iter::traits::iterator::Iterator>::try_fold::<(), <core[5d41cd2285a1e1cc]::iter::adapters::flatten::FlattenCompat<_, _>>::iter_try_fold::flatten<core[5d41cd2285a1e1cc]::option::Option<core[5d41cd2285a1e1cc]::result::Result<rustc_trait_selection[1258e9116b31c3d0]::traits::select::EvaluatedCandidate, rustc_middle[e576d51c83bb1f18]::traits::SelectionError>>, (), core[5d41cd2285a1e1cc]::ops::control_flow::ControlFlow<core[5d41cd2285a1e1cc]::ops::control_flow::ControlFlow<rustc_trait_selection[1258e9116b31c3d0]::traits::select::EvaluatedCandidate>>, <core[5d41cd2285a1e1cc]::iter::adapters::flatten::FlattenCompat<_, _> as core[5d41cd2285a1e1cc]::iter::traits::iterator::Iterator>::try_fold::flatten<core[5d41cd2285a1e1cc]::option::IntoIter<core[5d41cd2285a1e1cc]::result::Result<rustc_trait_selection[1258e9116b31c3d0]::traits::select::EvaluatedCandidate, rustc_middle[e576d51c83bb1f18]::traits::SelectionError>>, (), core[5d41cd2285a1e1cc]::ops::control_flow::ControlFlow<core[5d41cd2285a1e1cc]::ops::control_flow::ControlFlow<rustc_trait_selection[1258e9116b31c3d0]::traits::select::EvaluatedCandidate>>, <core[5d41cd2285a1e1cc]::iter::adapters::GenericShunt<core[5d41cd2285a1e1cc]::iter::adapters::flatten::FlatMap<core[5d41cd2285a1e1cc]::iter::adapters::map::Map<alloc[2b175870aad3dc26]::vec::into_iter::IntoIter<rustc_middle[e576d51c83bb1f18]::traits::select::SelectionCandidate>, <rustc_trait_selection[1258e9116b31c3d0]::traits::select::SelectionContext>::candidate_from_obligation_no_cache::{closure#1}>, core[5d41cd2285a1e1cc]::option::Option<core[5d41cd2285a1e1cc]::result::Result<rustc_trait_selection[1258e9116b31c3d0]::traits::select::EvaluatedCandidate, rustc_middle[e576d51c83bb1f18]::traits::SelectionError>>, <core[5d41cd2285a1e1cc]::result::Result<core[5d41cd2285a1e1cc]::option::Option<rustc_trait_selection[1258e9116b31c3d0]::traits::select::EvaluatedCandidate>, rustc_middle[e576d51c83bb1f18]::traits::SelectionError>>::transpose>, core[5d41cd2285a1e1cc]::result::Result<core[5d41cd2285a1e1cc]::convert::Infallible, rustc_middle[e576d51c83bb1f18]::traits::SelectionError>> as core[5d41cd2285a1e1cc]::iter::traits::iterator::Iterator>::try_fold<(), core[5d41cd2285a1e1cc]::iter::traits::iterator::Iterator::try_for_each::call<rustc_trait_selection[1258e9116b31c3d0]::traits::select::EvaluatedCandidate, core[5d41cd2285a1e1cc]::ops::control_flow::ControlFlow<rustc_trait_selection[1258e9116b31c3d0]::traits::select::EvaluatedCandidate>, core[5d41cd2285a1e1cc]::ops::control_flow::ControlFlow<rustc_trait_selection[1258e9116b31c3d0]::traits::select::EvaluatedCandidate>::Break>::{closure#0}, core[5d41cd2285a1e1cc]::ops::control_flow::ControlFlow<rustc_trait_selection[1258e9116b31c3d0]::traits::select::EvaluatedCandidate>>::{closure#0}>::{closure#0}>::{closure#0}, core[5d41cd2285a1e1cc]::ops::control_flow::ControlFlow<core[5d41cd2285a1e1cc]::ops::control_flow::ControlFlow<rustc_trait_selection[1258e9116b31c3d0]::traits::select::EvaluatedCandidate>>>
  58:        0x11e3a7363 - <core[5d41cd2285a1e1cc]::iter::adapters::GenericShunt<core[5d41cd2285a1e1cc]::iter::adapters::flatten::FlatMap<core[5d41cd2285a1e1cc]::iter::adapters::map::Map<alloc[2b175870aad3dc26]::vec::into_iter::IntoIter<rustc_middle[e576d51c83bb1f18]::traits::select::SelectionCandidate>, <rustc_trait_selection[1258e9116b31c3d0]::traits::select::SelectionContext>::candidate_from_obligation_no_cache::{closure#1}>, core[5d41cd2285a1e1cc]::option::Option<core[5d41cd2285a1e1cc]::result::Result<rustc_trait_selection[1258e9116b31c3d0]::traits::select::EvaluatedCandidate, rustc_middle[e576d51c83bb1f18]::traits::SelectionError>>, <core[5d41cd2285a1e1cc]::result::Result<core[5d41cd2285a1e1cc]::option::Option<rustc_trait_selection[1258e9116b31c3d0]::traits::select::EvaluatedCandidate>, rustc_middle[e576d51c83bb1f18]::traits::SelectionError>>::transpose>, core[5d41cd2285a1e1cc]::result::Result<core[5d41cd2285a1e1cc]::convert::Infallible, rustc_middle[e576d51c83bb1f18]::traits::SelectionError>> as core[5d41cd2285a1e1cc]::iter::traits::iterator::Iterator>::next
  59:        0x11e3c57ea - <alloc[2b175870aad3dc26]::vec::Vec<rustc_trait_selection[1258e9116b31c3d0]::traits::select::EvaluatedCandidate> as alloc[2b175870aad3dc26]::vec::spec_from_iter::SpecFromIter<rustc_trait_selection[1258e9116b31c3d0]::traits::select::EvaluatedCandidate, core[5d41cd2285a1e1cc]::iter::adapters::GenericShunt<core[5d41cd2285a1e1cc]::iter::adapters::flatten::FlatMap<core[5d41cd2285a1e1cc]::iter::adapters::map::Map<alloc[2b175870aad3dc26]::vec::into_iter::IntoIter<rustc_middle[e576d51c83bb1f18]::traits::select::SelectionCandidate>, <rustc_trait_selection[1258e9116b31c3d0]::traits::select::SelectionContext>::candidate_from_obligation_no_cache::{closure#1}>, core[5d41cd2285a1e1cc]::option::Option<core[5d41cd2285a1e1cc]::result::Result<rustc_trait_selection[1258e9116b31c3d0]::traits::select::EvaluatedCandidate, rustc_middle[e576d51c83bb1f18]::traits::SelectionError>>, <core[5d41cd2285a1e1cc]::result::Result<core[5d41cd2285a1e1cc]::option::Option<rustc_trait_selection[1258e9116b31c3d0]::traits::select::EvaluatedCandidate>, rustc_middle[e576d51c83bb1f18]::traits::SelectionError>>::transpose>, core[5d41cd2285a1e1cc]::result::Result<core[5d41cd2285a1e1cc]::convert::Infallible, rustc_middle[e576d51c83bb1f18]::traits::SelectionError>>>>::from_iter
  60:        0x11e335385 - <rustc_trait_selection[1258e9116b31c3d0]::traits::select::SelectionContext>::in_task::<<rustc_trait_selection[1258e9116b31c3d0]::traits::select::SelectionContext>::candidate_from_obligation::{closure#0}::{closure#0}, core[5d41cd2285a1e1cc]::result::Result<core[5d41cd2285a1e1cc]::option::Option<rustc_middle[e576d51c83bb1f18]::traits::select::SelectionCandidate>, rustc_middle[e576d51c83bb1f18]::traits::SelectionError>>::{closure#0}
  61:        0x11e3439bd - <rustc_trait_selection[1258e9116b31c3d0]::traits::select::SelectionContext>::candidate_from_obligation
  62:        0x11e348fb7 - <rustc_trait_selection[1258e9116b31c3d0]::traits::select::SelectionContext>::evaluate_trait_predicate_recursively::{closure#0}::{closure#1}
  63:        0x11e347553 - <rustc_trait_selection[1258e9116b31c3d0]::traits::select::SelectionContext>::evaluate_trait_predicate_recursively
  64:        0x11e345af3 - <rustc_trait_selection[1258e9116b31c3d0]::traits::select::SelectionContext>::evaluate_predicate_recursively
  65:        0x11e345712 - <rustc_trait_selection[1258e9116b31c3d0]::traits::select::SelectionContext>::evaluate_predicates_recursively::<alloc[2b175870aad3dc26]::vec::into_iter::IntoIter<rustc_infer[592299c261c2d420]::traits::Obligation<rustc_middle[e576d51c83bb1f18]::ty::Predicate>>>
  66:        0x11e48c9d9 - <rustc_infer[592299c261c2d420]::infer::InferCtxt>::probe::<core[5d41cd2285a1e1cc]::result::Result<rustc_middle[e576d51c83bb1f18]::traits::select::EvaluationResult, rustc_middle[e576d51c83bb1f18]::traits::select::OverflowError>, <rustc_trait_selection[1258e9116b31c3d0]::traits::select::SelectionContext>::evaluation_probe<<rustc_trait_selection[1258e9116b31c3d0]::traits::select::SelectionContext>::evaluate_candidate::{closure#0}::{closure#0}>::{closure#0}>
  67:        0x11e349046 - <rustc_trait_selection[1258e9116b31c3d0]::traits::select::SelectionContext>::evaluate_trait_predicate_recursively::{closure#0}::{closure#1}
  68:        0x11e347553 - <rustc_trait_selection[1258e9116b31c3d0]::traits::select::SelectionContext>::evaluate_trait_predicate_recursively
  69:        0x11e345af3 - <rustc_trait_selection[1258e9116b31c3d0]::traits::select::SelectionContext>::evaluate_predicate_recursively
  70:        0x11e48d2a4 - <rustc_infer[592299c261c2d420]::infer::InferCtxt>::probe::<core[5d41cd2285a1e1cc]::result::Result<rustc_middle[e576d51c83bb1f18]::traits::select::EvaluationResult, rustc_middle[e576d51c83bb1f18]::traits::select::OverflowError>, <rustc_trait_selection[1258e9116b31c3d0]::traits::select::SelectionContext>::evaluation_probe<<rustc_trait_selection[1258e9116b31c3d0]::traits::select::SelectionContext>::evaluate_root_obligation::{closure#0}>::{closure#0}>
  71:        0x11e57871d - rustc_traits[bd76edf8ea302ccc]::evaluate_obligation::evaluate_obligation
  72:        0x11dd7a617 - rustc_query_impl[f00bb7fedb42940d]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[f00bb7fedb42940d]::query_impl::evaluate_obligation::dynamic_query::{closure#2}::{closure#0}, rustc_middle[e576d51c83bb1f18]::query::erase::Erased<[u8; 2usize]>>
  73:        0x11df28f9f - <rustc_query_impl[f00bb7fedb42940d]::query_impl::evaluate_obligation::dynamic_query::{closure#2} as core[5d41cd2285a1e1cc]::ops::function::FnOnce<(rustc_middle[e576d51c83bb1f18]::ty::context::TyCtxt, rustc_type_ir[f5370dad05bceabf]::canonical::Canonical<rustc_middle[e576d51c83bb1f18]::ty::context::TyCtxt, rustc_middle[e576d51c83bb1f18]::ty::ParamEnvAnd<rustc_middle[e576d51c83bb1f18]::ty::Predicate>>)>>::call_once
  74:        0x11dc93ff0 - rustc_query_system[f11a898d5ea9e60a]::query::plumbing::try_execute_query::<rustc_query_impl[f00bb7fedb42940d]::DynamicConfig<rustc_query_system[f11a898d5ea9e60a]::query::caches::DefaultCache<rustc_type_ir[f5370dad05bceabf]::canonical::Canonical<rustc_middle[e576d51c83bb1f18]::ty::context::TyCtxt, rustc_middle[e576d51c83bb1f18]::ty::ParamEnvAnd<rustc_middle[e576d51c83bb1f18]::ty::Predicate>>, rustc_middle[e576d51c83bb1f18]::query::erase::Erased<[u8; 2usize]>>, false, false, false>, rustc_query_impl[f00bb7fedb42940d]::plumbing::QueryCtxt, false>
  75:        0x11df1852b - rustc_query_impl[f00bb7fedb42940d]::query_impl::evaluate_obligation::get_query_non_incr::__rust_end_short_backtrace
  76:        0x11e4ac7ab - <rustc_infer[592299c261c2d420]::infer::InferCtxt as rustc_trait_selection[1258e9116b31c3d0]::traits::query::evaluate_obligation::InferCtxtExt>::evaluate_obligation
  77:        0x10dc7b407 - <rustdoc[4257f5d8f2b1dae7]::clean::blanket_impl::BlanketImplFinder>::get_blanket_impls
  78:        0x10dcc9c95 - rustdoc[4257f5d8f2b1dae7]::clean::utils::get_auto_trait_and_blanket_impls
  79:        0x10dbba4fe - <rustdoc[4257f5d8f2b1dae7]::passes::collect_trait_impls::SyntheticImplCollector as rustdoc[4257f5d8f2b1dae7]::visit::DocVisitor>::visit_item
  80:        0x10dbba5fc - <rustdoc[4257f5d8f2b1dae7]::passes::collect_trait_impls::SyntheticImplCollector as rustdoc[4257f5d8f2b1dae7]::visit::DocVisitor>::visit_item
  81:        0x10dbba5fc - <rustdoc[4257f5d8f2b1dae7]::passes::collect_trait_impls::SyntheticImplCollector as rustdoc[4257f5d8f2b1dae7]::visit::DocVisitor>::visit_item
  82:        0x10dbba5fc - <rustdoc[4257f5d8f2b1dae7]::passes::collect_trait_impls::SyntheticImplCollector as rustdoc[4257f5d8f2b1dae7]::visit::DocVisitor>::visit_item
  83:        0x10dbb77b1 - rustdoc[4257f5d8f2b1dae7]::passes::collect_trait_impls::collect_trait_impls
  84:        0x10db78887 - <rustc_session[474e4fd152043607]::session::Session>::time::<(rustdoc[4257f5d8f2b1dae7]::clean::types::Crate, rustdoc[4257f5d8f2b1dae7]::config::RenderOptions, rustdoc[4257f5d8f2b1dae7]::formats::cache::Cache), rustdoc[4257f5d8f2b1dae7]::main_args::{closure#1}::{closure#0}::{closure#0}::{closure#0}>
  85:        0x10dc55596 - <rustc_middle[e576d51c83bb1f18]::ty::context::GlobalCtxt>::enter::<rustdoc[4257f5d8f2b1dae7]::main_args::{closure#1}::{closure#0}::{closure#0}, core[5d41cd2285a1e1cc]::result::Result<(), rustc_span[421aa80b499152af]::ErrorGuaranteed>>
  86:        0x10db4bb9b - <rustc_interface[e66ff0e65a57fecb]::interface::Compiler>::enter::<rustdoc[4257f5d8f2b1dae7]::main_args::{closure#1}::{closure#0}, core[5d41cd2285a1e1cc]::result::Result<(), rustc_span[421aa80b499152af]::ErrorGuaranteed>>
  87:        0x10db97b74 - rustc_interface[e66ff0e65a57fecb]::interface::run_compiler::<core[5d41cd2285a1e1cc]::result::Result<(), rustc_span[421aa80b499152af]::ErrorGuaranteed>, rustdoc[4257f5d8f2b1dae7]::main_args::{closure#1}>::{closure#0}
  88:        0x10db92a99 - std[c8f2730e1e4a363e]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[e66ff0e65a57fecb]::util::run_in_thread_with_globals<rustc_interface[e66ff0e65a57fecb]::util::run_in_thread_pool_with_globals<rustc_interface[e66ff0e65a57fecb]::interface::run_compiler<core[5d41cd2285a1e1cc]::result::Result<(), rustc_span[421aa80b499152af]::ErrorGuaranteed>, rustdoc[4257f5d8f2b1dae7]::main_args::{closure#1}>::{closure#0}, core[5d41cd2285a1e1cc]::result::Result<(), rustc_span[421aa80b499152af]::ErrorGuaranteed>>::{closure#0}, core[5d41cd2285a1e1cc]::result::Result<(), rustc_span[421aa80b499152af]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[5d41cd2285a1e1cc]::result::Result<(), rustc_span[421aa80b499152af]::ErrorGuaranteed>>
  89:        0x10daa9e2e - <<std[c8f2730e1e4a363e]::thread::Builder>::spawn_unchecked_<rustc_interface[e66ff0e65a57fecb]::util::run_in_thread_with_globals<rustc_interface[e66ff0e65a57fecb]::util::run_in_thread_pool_with_globals<rustc_interface[e66ff0e65a57fecb]::interface::run_compiler<core[5d41cd2285a1e1cc]::result::Result<(), rustc_span[421aa80b499152af]::ErrorGuaranteed>, rustdoc[4257f5d8f2b1dae7]::main_args::{closure#1}>::{closure#0}, core[5d41cd2285a1e1cc]::result::Result<(), rustc_span[421aa80b499152af]::ErrorGuaranteed>>::{closure#0}, core[5d41cd2285a1e1cc]::result::Result<(), rustc_span[421aa80b499152af]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[5d41cd2285a1e1cc]::result::Result<(), rustc_span[421aa80b499152af]::ErrorGuaranteed>>::{closure#1} as core[5d41cd2285a1e1cc]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  90:        0x10f2fa9f9 - std::sys::unix::thread::Thread::new::thread_start::hf21514fbfb46a5c0
  91:     0x7ff8017744e1 - __pthread_start

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-rustdoc&template=ice.md

note: please attach the file at `/Users/kpreid/.cargo/registry/src/index.crates.io-6f17d22bba15001f/futures-util-0.3.28/rustc-ice-2023-12-08T19_50_41-15023.txt` to your bug report

note: compiler flags: --crate-type lib

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

query stack during panic:
#0 [evaluate_obligation] evaluating trait selection obligation `stream::stream::FlatMapUnordered<^1_1, ^1_2, ^1_0>: futures_core::stream::Stream`
end of query stack

@rustbot label +regression-from-stable-to-nightly +A-rustdoc

[kpreid]

@rustbot label +T-rustdoc

[compiler-errors]

should be fixed by #118710

[rhysd]

wry development encountered this issue and confirmed it was fixed with the latest nightly compiler:

• Occurred: 503e12932 2023-12-07 (job run)
• Fixed: d86d65bbc 2023-12-10 (job run)

[fmease]

Closing as completed then. kpreid, please let me know if this still an issue and I will reopen.