rustdoc: ICE: synthetic auto trait impls: `failed to fully process […]` involving projections & projection predicates

[matthiaskrgr]

Code

pub struct Inner<'a, T: 'a> {
    field: &'a T,
}

trait MyTrait {
    type MyItem;
}

trait OtherTrait {}

unsafe impl<'a, T> Send for Inner<'a, T>
where
    'a: 'static,
    T: MyTrait<MyItem = bool>,
{
}

unsafe impl<'a, T> Sync for Inner<'a, T>
where
    'a: 'static,
    T: MyTrait<MyItem = bool>,
    <T as MyTrait>::MyItem: OtherTrait,
{
}

pub struct Foo<'c, K: 'c> {
    inner_field: Inner<'c, K>,
}

Meta

rustc --version --verbose:

Error output

rustdoc 1.71.0-nightly (b628260df 2023-04-22)
binary: rustdoc
commit-hash: b628260df0587ae559253d8640ecb8738d3de613
commit-date: 2023-04-22
host: x86_64-unknown-linux-gnu
release: 1.71.0-nightly
LLVM version: 16.0.2

Backtrace

thread 'rustc' panicked at 'Failed to fully process: Foo<'c, K> DefId(2:2681 ~ core[6cf6]::marker::Sync) ParamEnv { caller_bounds: [Binder(TraitPredicate(<K as std::marker::Sized>, polarity:Positive), []), Binder(OutlivesPredicate(K, ReEarlyBound(0, 'c)), [])], reveal: UserFacing, constness: NotConst }', /rustc/b628260df0587ae559253d8640ecb8738d3de613/compiler/rustc_trait_selection/src/traits/auto_trait.rs:169:17
stack backtrace:
   0:     0x7ff454b68d93 - std::backtrace_rs::backtrace::libunwind::trace::hb9265895128f1f9c
                               at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7ff454b68d93 - std::backtrace_rs::backtrace::trace_unsynchronized::h028901cb3a0224b1
                               at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7ff454b68d93 - std::sys_common::backtrace::_print_fmt::hfa5c37f64d314fee
                               at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/sys_common/backtrace.rs:65:5
   3:     0x7ff454b68d93 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h5b30f1684e8bd3e6
                               at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7ff454bc977f - core::fmt::write::h997ecd0e22e2af7a
                               at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/core/src/fmt/mod.rs:1247:17
   5:     0x7ff454b5bde1 - std::io::Write::write_fmt::h291317e85b978e13
                               at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/io/mod.rs:1698:15
   6:     0x7ff454b68ba5 - std::sys_common::backtrace::_print::h0133b24def7b99d9
                               at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/sys_common/backtrace.rs:47:5
   7:     0x7ff454b68ba5 - std::sys_common::backtrace::print::h4a42174c7f3bd207
                               at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/sys_common/backtrace.rs:34:9
   8:     0x7ff454b6b69f - std::panicking::default_hook::{{closure}}::h0847452fe926d6e5
   9:     0x7ff454b6b357 - std::panicking::default_hook::hbcdd7833994c05d0
                               at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/panicking.rs:293:9
  10:     0x7ff457e2a815 - <rustc_driver_impl[6beef204b99823c0]::DEFAULT_HOOK::{closure#0}::{closure#0} as core[6cf684c3b560543b]::ops::function::FnOnce<(&core[6cf684c3b560543b]::panic::panic_info::PanicInfo,)>>::call_once::{shim:vtable#0}
  11:     0x7ff454b6be55 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::hd538136c3a298239
                               at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/alloc/src/boxed.rs:1976:9
  12:     0x7ff454b6be55 - std::panicking::rust_panic_with_hook::hb55c52c8e21298f0
                               at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/panicking.rs:704:13
  13:     0x7ff454b6bbc3 - std::panicking::begin_panic_handler::{{closure}}::h51ad0ee3ee1b4d02
                               at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/panicking.rs:595:13
  14:     0x7ff454b691d6 - std::sys_common::backtrace::__rust_end_short_backtrace::hd1006853c72eedaf
                               at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/sys_common/backtrace.rs:150:18
  15:     0x7ff454b6b8c2 - rust_begin_unwind
                               at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/panicking.rs:584:5
  16:     0x7ff454bc5a13 - core::panicking::panic_fmt::h0405aceea833a54b
                               at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/core/src/panicking.rs:67:14
  17:     0x555b2bd80460 - <rustc_trait_selection[d0b596a23f484fce]::traits::auto_trait::AutoTraitFinder>::find_auto_trait_generics::<rustdoc[528331f52b1a723d]::clean::types::Generics, <rustdoc[528331f52b1a723d]::clean::auto_trait::AutoTraitFinder>::generate_for_trait::{closure#0}>
  18:     0x555b2bb13a2d - <rustdoc[528331f52b1a723d]::clean::auto_trait::AutoTraitFinder>::generate_for_trait
  19:     0x555b2bcabe81 - <alloc[dc090090a0f7fcb0]::vec::Vec<rustdoc[528331f52b1a723d]::clean::types::Item> as alloc[dc090090a0f7fcb0]::vec::spec_from_iter::SpecFromIter<rustdoc[528331f52b1a723d]::clean::types::Item, core[6cf684c3b560543b]::iter::adapters::filter_map::FilterMap<alloc[dc090090a0f7fcb0]::vec::into_iter::IntoIter<rustc_span[2bbd0fdc9680f436]::def_id::DefId>, <rustdoc[528331f52b1a723d]::clean::auto_trait::AutoTraitFinder>::get_auto_trait_impls::{closure#0}>>>::from_iter
  20:     0x555b2bb143a7 - <rustdoc[528331f52b1a723d]::clean::auto_trait::AutoTraitFinder>::get_auto_trait_impls
  21:     0x555b2bc11521 - rustdoc[528331f52b1a723d]::clean::utils::get_auto_trait_and_blanket_impls
  22:     0x555b2be086ef - <rustdoc[528331f52b1a723d]::passes::collect_trait_impls::SyntheticImplCollector as rustdoc[528331f52b1a723d]::visit::DocVisitor>::visit_item
  23:     0x555b2be087fa - <rustdoc[528331f52b1a723d]::passes::collect_trait_impls::SyntheticImplCollector as rustdoc[528331f52b1a723d]::visit::DocVisitor>::visit_item
  24:     0x555b2be0d0f6 - <rustdoc[528331f52b1a723d]::passes::collect_trait_impls::SyntheticImplCollector as rustdoc[528331f52b1a723d]::visit::DocVisitor>::visit_crate
  25:     0x555b2bccec31 - <rustc_session[a507976b3601bb0a]::session::Session>::time::<alloc[dc090090a0f7fcb0]::vec::Vec<rustdoc[528331f52b1a723d]::clean::types::Item>, rustdoc[528331f52b1a723d]::passes::collect_trait_impls::collect_trait_impls::{closure#0}>
  26:     0x555b2be056a9 - rustdoc[528331f52b1a723d]::passes::collect_trait_impls::collect_trait_impls
  27:     0x555b2bccee42 - <rustc_session[a507976b3601bb0a]::session::Session>::time::<rustdoc[528331f52b1a723d]::clean::types::Crate, rustdoc[528331f52b1a723d]::core::run_global_ctxt::{closure#8}>
  28:     0x555b2bd7870f - rustdoc[528331f52b1a723d]::core::run_global_ctxt
  29:     0x555b2bccf0be - <rustc_session[a507976b3601bb0a]::session::Session>::time::<(rustdoc[528331f52b1a723d]::clean::types::Crate, rustdoc[528331f52b1a723d]::config::RenderOptions, rustdoc[528331f52b1a723d]::formats::cache::Cache), rustdoc[528331f52b1a723d]::main_args::{closure#1}::{closure#0}::{closure#0}::{closure#0}>
  30:     0x555b2bb409a0 - <rustc_middle[c2d73d0bca510e43]::ty::context::GlobalCtxt>::enter::<rustdoc[528331f52b1a723d]::main_args::{closure#1}::{closure#0}::{closure#0}, core[6cf684c3b560543b]::result::Result<(), rustc_span[2bbd0fdc9680f436]::ErrorGuaranteed>>
  31:     0x555b2bbd99aa - <rustc_interface[f51b23ce14955e2d]::interface::Compiler>::enter::<rustdoc[528331f52b1a723d]::main_args::{closure#1}::{closure#0}, core[6cf684c3b560543b]::result::Result<(), rustc_span[2bbd0fdc9680f436]::ErrorGuaranteed>>
  32:     0x555b2bd79d2b - rustc_span[2bbd0fdc9680f436]::set_source_map::<core[6cf684c3b560543b]::result::Result<(), rustc_span[2bbd0fdc9680f436]::ErrorGuaranteed>, rustc_interface[f51b23ce14955e2d]::interface::run_compiler<core[6cf684c3b560543b]::result::Result<(), rustc_span[2bbd0fdc9680f436]::ErrorGuaranteed>, rustdoc[528331f52b1a723d]::main_args::{closure#1}>::{closure#0}::{closure#0}>
  33:     0x555b2bbdb66d - <scoped_tls[ab8992ac05ee2537]::ScopedKey<rustc_span[2bbd0fdc9680f436]::SessionGlobals>>::set::<rustc_interface[f51b23ce14955e2d]::interface::run_compiler<core[6cf684c3b560543b]::result::Result<(), rustc_span[2bbd0fdc9680f436]::ErrorGuaranteed>, rustdoc[528331f52b1a723d]::main_args::{closure#1}>::{closure#0}, core[6cf684c3b560543b]::result::Result<(), rustc_span[2bbd0fdc9680f436]::ErrorGuaranteed>>
  34:     0x555b2baf58e9 - std[7eada91b7b6d60d5]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[f51b23ce14955e2d]::util::run_in_thread_pool_with_globals<rustc_interface[f51b23ce14955e2d]::interface::run_compiler<core[6cf684c3b560543b]::result::Result<(), rustc_span[2bbd0fdc9680f436]::ErrorGuaranteed>, rustdoc[528331f52b1a723d]::main_args::{closure#1}>::{closure#0}, core[6cf684c3b560543b]::result::Result<(), rustc_span[2bbd0fdc9680f436]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[6cf684c3b560543b]::result::Result<(), rustc_span[2bbd0fdc9680f436]::ErrorGuaranteed>>
  35:     0x555b2be2bb5d - <<std[7eada91b7b6d60d5]::thread::Builder>::spawn_unchecked_<rustc_interface[f51b23ce14955e2d]::util::run_in_thread_pool_with_globals<rustc_interface[f51b23ce14955e2d]::interface::run_compiler<core[6cf684c3b560543b]::result::Result<(), rustc_span[2bbd0fdc9680f436]::ErrorGuaranteed>, rustdoc[528331f52b1a723d]::main_args::{closure#1}>::{closure#0}, core[6cf684c3b560543b]::result::Result<(), rustc_span[2bbd0fdc9680f436]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[6cf684c3b560543b]::result::Result<(), rustc_span[2bbd0fdc9680f436]::ErrorGuaranteed>>::{closure#1} as core[6cf684c3b560543b]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  36:     0x7ff454b76255 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::he5dc381da166b1f4
                               at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/alloc/src/boxed.rs:1962:9
  37:     0x7ff454b76255 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h2873f5088eb028a4
                               at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/alloc/src/boxed.rs:1962:9
  38:     0x7ff454b76255 - std::sys::unix::thread::Thread::new::thread_start::h737c68bdf349b13b
                               at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/sys/unix/thread.rs:108:17
  39:     0x7ff454828bb5 - <unknown>
  40:     0x7ff4548aad90 - <unknown>
  41:                0x0 - <unknown>

error: the compiler unexpectedly panthread 'rustc' panicked at 'Failed to fully process: Foo<'c, K> DefId(2:2681 ~ core[6cf6]::marker::Sync) ParamEnv { caller_bounds: [Binder(TraitPredicate(<K as std::marker::Sized>, polarity:Positive), []), Binder(OutlivesPredicate(K, ReEarlyBound(0, 'c)), [])], reveal: UserFacing, constness: NotConst }', /rustc/b628260df0587ae559253d8640ecb8738d3de613/compiler/rustc_trait_selection/src/traits/auto_trait.rs:169:17
stack backtrace:
   0:     0x7ff454b68d93 - std::backtrace_rs::backtrace::libunwind::trace::hb9265895128f1f9c
                               at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7ff454b68d93 - std::backtrace_rs::backtrace::trace_unsynchronized::h028901cb3a0224b1
                               at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7ff454b68d93 - std::sys_common::backtrace::_print_fmt::hfa5c37f64d314fee
                               at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/sys_common/backtrace.rs:65:5
   3:     0x7ff454b68d93 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h5b30f1684e8bd3e6
                               at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7ff454bc977f - core::fmt::write::h997ecd0e22e2af7a
                               at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/core/src/fmt/mod.rs:1247:17
   5:     0x7ff454b5bde1 - std::io::Write::write_fmt::h291317e85b978e13
                               at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/io/mod.rs:1698:15
   6:     0x7ff454b68ba5 - std::sys_common::backtrace::_print::h0133b24def7b99d9
                               at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/sys_common/backtrace.rs:47:5
   7:     0x7ff454b68ba5 - std::sys_common::backtrace::print::h4a42174c7f3bd207
                               at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/sys_common/backtrace.rs:34:9
   8:     0x7ff454b6b69f - std::panicking::default_hook::{{closure}}::h0847452fe926d6e5
   9:     0x7ff454b6b357 - std::panicking::default_hook::hbcdd7833994c05d0
                               at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/panicking.rs:293:9
  10:     0x7ff457e2a815 - <rustc_driver_impl[6beef204b99823c0]::DEFAULT_HOOK::{closure#0}::{closure#0} as core[6cf684c3b560543b]::ops::function::FnOnce<(&core[6cf684c3b560543b]::panic::panic_info::PanicInfo,)>>::call_once::{shim:vtable#0}
  11:     0x7ff454b6be55 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::hd538136c3a298239
                               at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/alloc/src/boxed.rs:1976:9
  12:     0x7ff454b6be55 - std::panicking::rust_panic_with_hook::hb55c52c8e21298f0
                               at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/panicking.rs:704:13
  13:     0x7ff454b6bbc3 - std::panicking::begin_panic_handler::{{closure}}::h51ad0ee3ee1b4d02
                               at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/panicking.rs:595:13
  14:     0x7ff454b691d6 - std::sys_common::backtrace::__rust_end_short_backtrace::hd1006853c72eedaf
                               at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/sys_common/backtrace.rs:150:18
  15:     0x7ff454b6b8c2 - rust_begin_unwind
                               at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/panicking.rs:584:5
  16:     0x7ff454bc5a13 - core::panicking::panic_fmt::h0405aceea833a54b
                               at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/core/src/panicking.rs:67:14
  17:     0x555b2bd80460 - <rustc_trait_selection[d0b596a23f484fce]::traits::auto_trait::AutoTraitFinder>::find_auto_trait_generics::<rustdoc[528331f52b1a723d]::clean::types::Generics, <rustdoc[528331f52b1a723d]::clean::auto_trait::AutoTraitFinder>::generate_for_trait::{closure#0}>
  18:     0x555b2bb13a2d - <rustdoc[528331f52b1a723d]::clean::auto_trait::AutoTraitFinder>::generate_for_trait
  19:     0x555b2bcabe81 - <alloc[dc090090a0f7fcb0]::vec::Vec<rustdoc[528331f52b1a723d]::clean::types::Item> as alloc[dc090090a0f7fcb0]::vec::spec_from_iter::SpecFromIter<rustdoc[528331f52b1a723d]::clean::types::Item, core[6cf684c3b560543b]::iter::adapters::filter_map::FilterMap<alloc[dc090090a0f7fcb0]::vec::into_iter::IntoIter<rustc_span[2bbd0fdc9680f436]::def_id::DefId>, <rustdoc[528331f52b1a723d]::clean::auto_trait::AutoTraitFinder>::get_auto_trait_impls::{closure#0}>>>::from_iter
  20:     0x555b2bb143a7 - <rustdoc[528331f52b1a723d]::clean::auto_trait::AutoTraitFinder>::get_auto_trait_impls
  21:     0x555b2bc11521 - rustdoc[528331f52b1a723d]::clean::utils::get_auto_trait_and_blanket_impls
  22:     0x555b2be086ef - <rustdoc[528331f52b1a723d]::passes::collect_trait_impls::SyntheticImplCollector as rustdoc[528331f52b1a723d]::visit::DocVisitor>::visit_item
  23:     0x555b2be087fa - <rustdoc[528331f52b1a723d]::passes::collect_trait_impls::SyntheticImplCollector as rustdoc[528331f52b1a723d]::visit::DocVisitor>::visit_item
  24:     0x555b2be0d0f6 - <rustdoc[528331f52b1a723d]::passes::collect_trait_impls::SyntheticImplCollector as rustdoc[528331f52b1a723d]::visit::DocVisitor>::visit_crate
  25:     0x555b2bccec31 - <rustc_session[a507976b3601bb0a]::session::Session>::time::<alloc[dc090090a0f7fcb0]::vec::Vec<rustdoc[528331f52b1a723d]::clean::types::Item>, rustdoc[528331f52b1a723d]::passes::collect_trait_impls::collect_trait_impls::{closure#0}>
  26:     0x555b2be056a9 - rustdoc[528331f52b1a723d]::passes::collect_trait_impls::collect_trait_impls
  27:     0x555b2bccee42 - <rustc_session[a507976b3601bb0a]::session::Session>::time::<rustdoc[528331f52b1a723d]::clean::types::Crate, rustdoc[528331f52b1a723d]::core::run_global_ctxt::{closure#8}>
  28:     0x555b2bd7870f - rustdoc[528331f52b1a723d]::core::run_global_ctxt
  29:     0x555b2bccf0be - <rustc_session[a507976b3601bb0a]::session::Session>::time::<(rustdoc[528331f52b1a723d]::clean::types::Crate, rustdoc[528331f52b1a723d]::config::RenderOptions, rustdoc[528331f52b1a723d]::formats::cache::Cache), rustdoc[528331f52b1a723d]::main_args::{closure#1}::{closure#0}::{closure#0}::{closure#0}>
  30:     0x555b2bb409a0 - <rustc_middle[c2d73d0bca510e43]::ty::context::GlobalCtxt>::enter::<rustdoc[528331f52b1a723d]::main_args::{closure#1}::{closure#0}::{closure#0}, core[6cf684c3b560543b]::result::Result<(), rustc_span[2bbd0fdc9680f436]::ErrorGuaranteed>>
  31:     0x555b2bbd99aa - <rustc_interface[f51b23ce14955e2d]::interface::Compiler>::enter::<rustdoc[528331f52b1a723d]::main_args::{closure#1}::{closure#0}, core[6cf684c3b560543b]::result::Result<(), rustc_span[2bbd0fdc9680f436]::ErrorGuaranteed>>
  32:     0x555b2bd79d2b - rustc_span[2bbd0fdc9680f436]::set_source_map::<core[6cf684c3b560543b]::result::Result<(), rustc_span[2bbd0fdc9680f436]::ErrorGuaranteed>, rustc_interface[f51b23ce14955e2d]::interface::run_compiler<core[6cf684c3b560543b]::result::Result<(), rustc_span[2bbd0fdc9680f436]::ErrorGuaranteed>, rustdoc[528331f52b1a723d]::main_args::{closure#1}>::{closure#0}::{closure#0}>
  33:     0x555b2bbdb66d - <scoped_tls[ab8992ac05ee2537]::ScopedKey<rustc_span[2bbd0fdc9680f436]::SessionGlobals>>::set::<rustc_interface[f51b23ce14955e2d]::interface::run_compiler<core[6cf684c3b560543b]::result::Result<(), rustc_span[2bbd0fdc9680f436]::ErrorGuaranteed>, rustdoc[528331f52b1a723d]::main_args::{closure#1}>::{closure#0}, core[6cf684c3b560543b]::result::Result<(), rustc_span[2bbd0fdc9680f436]::ErrorGuaranteed>>
  34:     0x555b2baf58e9 - std[7eada91b7b6d60d5]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[f51b23ce14955e2d]::util::run_in_thread_pool_with_globals<rustc_interface[f51b23ce14955e2d]::interface::run_compiler<core[6cf684c3b560543b]::result::Result<(), rustc_span[2bbd0fdc9680f436]::ErrorGuaranteed>, rustdoc[528331f52b1a723d]::main_args::{closure#1}>::{closure#0}, core[6cf684c3b560543b]::result::Result<(), rustc_span[2bbd0fdc9680f436]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[6cf684c3b560543b]::result::Result<(), rustc_span[2bbd0fdc9680f436]::ErrorGuaranteed>>
  35:     0x555b2be2bb5d - <<std[7eada91b7b6d60d5]::thread::Builder>::spawn_unchecked_<rustc_interface[f51b23ce14955e2d]::util::run_in_thread_pool_with_globals<rustc_interface[f51b23ce14955e2d]::interface::run_compiler<core[6cf684c3b560543b]::result::Result<(), rustc_span[2bbd0fdc9680f436]::ErrorGuaranteed>, rustdoc[528331f52b1a723d]::main_args::{closure#1}>::{closure#0}, core[6cf684c3b560543b]::result::Result<(), rustc_span[2bbd0fdc9680f436]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[6cf684c3b560543b]::result::Result<(), rustc_span[2bbd0fdc9680f436]::ErrorGuaranteed>>::{closure#1} as core[6cf684c3b560543b]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  36:     0x7ff454b76255 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::he5dc381da166b1f4
                               at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/alloc/src/boxed.rs:1962:9
  37:     0x7ff454b76255 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h2873f5088eb028a4
                               at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/alloc/src/boxed.rs:1962:9
  38:     0x7ff454b76255 - std::sys::unix::thread::Thread::new::thread_start::h737c68bdf349b13b
                               at /rustc/b628260df0587ae559253d8640ecb8738d3de613/library/std/src/sys/unix/thread.rs:108:17
  39:     0x7ff454828bb5 - <unknown>
  40:     0x7ff4548aad90 - <unknown>
  41:                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: rustc 1.71.0-nightly (b628260df 2023-04-22) running on x86_64-unknown-linux-gnu

query stack during panic:
end of query stackicked. 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: rustc 1.71.0-nightly (b628260df 2023-04-22) running on x86_64-unknown-linux-gnu

query stack during panic:
end of query stack

[matthiaskrgr]

crashing since at least mid 2020

[fmease]

@rustbot label A-auto-traits A-synthetic-impls

[bvanjoi]

reduce:

pub struct Inner<T>(T);

trait MyTrait {
    type MyItem;
}

trait OtherTrait {}

unsafe impl<T> Sync for Inner<T>
where
    T: MyTrait<MyItem = bool>,
    <T as MyTrait>::MyItem: OtherTrait,
{
}

pub struct Foo<K> {
    inner_field: Inner<K>,
}