ICE: rpitit: `item_name: no name for DefPath {..}`

[matthiaskrgr]

Code

#![feature(return_position_impl_trait_in_trait)]

trait Foo {
    fn bar<'other: 'a>() -> impl Sized + 'a {}
}

Meta

rustc --version --verbose:

rustc 1.73.0-nightly (0e8e857b1 2023-07-16)
binary: rustc
commit-hash: 0e8e857b11f60a785aea24a84f280f6dad7a4d42
commit-date: 2023-07-16
host: x86_64-unknown-linux-gnu
release: 1.73.0-nightly
LLVM version: 16.0.5

Error output

error[E0261]: use of undeclared lifetime name `'a`
 --> treereduce.out:4:20
  |
4 |     fn bar<'other: 'a>() -> impl Sized + 'a {}
  |                    ^^ undeclared lifetime
  |
help: consider introducing lifetime `'a` here
  |
4 |     fn bar<'a, 'other: 'a>() -> impl Sized + 'a {}
  |            +++
help: consider introducing lifetime `'a` here
  |
3 | trait Foo<'a> {
  |          ++++

error[E0261]: use of undeclared lifetime name `'a`
 --> treereduce.out:4:42
  |
4 |     fn bar<'other: 'a>() -> impl Sized + 'a {}
  |                                          ^^ undeclared lifetime
  |
help: consider introducing lifetime `'a` here
  |
4 |     fn bar<'a, 'other: 'a>() -> impl Sized + 'a {}
  |            +++
help: consider introducing lifetime `'a` here
  |
3 | trait Foo<'a> {
  |          ++++

error[E0601]: `main` function not found in crate `treereduce`
 --> treereduce.out:5:2
  |
5 | }
  |  ^ consider adding a `main` function to `treereduce.out`

Backtrace

error: internal compiler error: compiler/rustc_middle/src/ty/mod.rs:2342:13: item_name: no name for DefPath { data: [DisambiguatedDefPathData { data: TypeNs("Foo"), disambiguator: 0 }, DisambiguatedDefPathData { data: ImplTraitAssocTy, disambiguator: 0 }], krate: crate0 }

thread 'rustc' panicked at 'Box<dyn Any>', /rustc/0e8e857b11f60a785aea24a84f280f6dad7a4d42/compiler/rustc_errors/src/lib.rs:1651:9
stack backtrace:
   0:     0x7fab0e3641e1 - std::backtrace_rs::backtrace::libunwind::trace::h5f856d2c12cc6674
                               at /rustc/0e8e857b11f60a785aea24a84f280f6dad7a4d42/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7fab0e3641e1 - std::backtrace_rs::backtrace::trace_unsynchronized::h8449257397d4b934
                               at /rustc/0e8e857b11f60a785aea24a84f280f6dad7a4d42/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7fab0e3641e1 - std::sys_common::backtrace::_print_fmt::hc0c3bab7873ac244
                               at /rustc/0e8e857b11f60a785aea24a84f280f6dad7a4d42/library/std/src/sys_common/backtrace.rs:65:5
   3:     0x7fab0e3641e1 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h3787c35683fa4233
                               at /rustc/0e8e857b11f60a785aea24a84f280f6dad7a4d42/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7fab0e3ca19c - core::fmt::rt::Argument::fmt::hae0c3aa49888479e
                               at /rustc/0e8e857b11f60a785aea24a84f280f6dad7a4d42/library/core/src/fmt/rt.rs:138:9
   5:     0x7fab0e3ca19c - core::fmt::write::h0f833d45d904ecbb
                               at /rustc/0e8e857b11f60a785aea24a84f280f6dad7a4d42/library/core/src/fmt/mod.rs:1094:21
   6:     0x7fab0e356b8e - std::io::Write::write_fmt::h6fd13360259fea22
                               at /rustc/0e8e857b11f60a785aea24a84f280f6dad7a4d42/library/std/src/io/mod.rs:1714:15
   7:     0x7fab0e363ff5 - std::sys_common::backtrace::_print::h715af68f97f33bd8
                               at /rustc/0e8e857b11f60a785aea24a84f280f6dad7a4d42/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7fab0e363ff5 - std::sys_common::backtrace::print::h292b9e4a1d37eead
                               at /rustc/0e8e857b11f60a785aea24a84f280f6dad7a4d42/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7fab0e366da3 - std::panicking::default_hook::{{closure}}::hab7084ecbd5f7152
                               at /rustc/0e8e857b11f60a785aea24a84f280f6dad7a4d42/library/std/src/panicking.rs:269:22
  10:     0x7fab0e366b34 - std::panicking::default_hook::hfbb8ba894af6577e
                               at /rustc/0e8e857b11f60a785aea24a84f280f6dad7a4d42/library/std/src/panicking.rs:288:9
  11:     0x7fab1162a43b - rustc_driver_impl[5bf76b44b01c010b]::install_ice_hook::{closure#0}
  12:     0x7fab0e3675ce - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::hc6428110305b5cbe
                               at /rustc/0e8e857b11f60a785aea24a84f280f6dad7a4d42/library/alloc/src/boxed.rs:2021:9
  13:     0x7fab0e3675ce - std::panicking::rust_panic_with_hook::h8a8f983a7c12e89b
                               at /rustc/0e8e857b11f60a785aea24a84f280f6dad7a4d42/library/std/src/panicking.rs:709:13
  14:     0x7fab11bb0221 - std[c0adc0b90f4efda2]::panicking::begin_panic::<rustc_errors[741302e11db422c1]::ExplicitBug>::{closure#0}
  15:     0x7fab11bac6e6 - std[c0adc0b90f4efda2]::sys_common::backtrace::__rust_end_short_backtrace::<std[c0adc0b90f4efda2]::panicking::begin_panic<rustc_errors[741302e11db422c1]::ExplicitBug>::{closure#0}, !>
  16:     0x7fab11c30966 - std[c0adc0b90f4efda2]::panicking::begin_panic::<rustc_errors[741302e11db422c1]::ExplicitBug>
  17:     0x7fab11c2eba4 - <rustc_errors[741302e11db422c1]::HandlerInner>::bug::<alloc[39bc782e9623f60c]::string::String>
  18:     0x7fab11c2e9b8 - <rustc_errors[741302e11db422c1]::Handler>::bug::<alloc[39bc782e9623f60c]::string::String>
  19:     0x7fab11b56b1c - rustc_middle[835d091ebc4d05d9]::util::bug::opt_span_bug_fmt::<rustc_span[a69db53e102135]::span_encoding::Span>::{closure#0}
  20:     0x7fab11b51eea - rustc_middle[835d091ebc4d05d9]::ty::context::tls::with_opt::<rustc_middle[835d091ebc4d05d9]::util::bug::opt_span_bug_fmt<rustc_span[a69db53e102135]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  21:     0x7fab11b51eb8 - rustc_middle[835d091ebc4d05d9]::ty::context::tls::with_context_opt::<rustc_middle[835d091ebc4d05d9]::ty::context::tls::with_opt<rustc_middle[835d091ebc4d05d9]::util::bug::opt_span_bug_fmt<rustc_span[a69db53e102135]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  22:     0x7fab103c9f80 - rustc_middle[835d091ebc4d05d9]::util::bug::bug_fmt
  23:     0x7fab0fc50396 - <rustc_middle[835d091ebc4d05d9]::ty::context::TyCtxt>::item_name
  24:     0x7fab1195813c - <rustc_infer[d627e1df91fd7fd6]::infer::error_reporting::TypeErrCtxt>::report_concrete_failure
  25:     0x7fab119607ea - <rustc_infer[d627e1df91fd7fd6]::infer::error_reporting::TypeErrCtxt>::report_region_errors
  26:     0x7fab1022ac92 - <rustc_trait_selection[4828e09977927b86]::traits::engine::ObligationCtxt>::resolve_regions_and_report_errors
  27:     0x7fab1075d1b6 - rustc_hir_analysis[dc7bd52400bbf8cf]::check::compare_impl_item::check_type_bounds
  28:     0x7fab1074d259 - rustc_hir_analysis[dc7bd52400bbf8cf]::check::check::check_mod_item_types
  29:     0x7fab1034f8bc - rustc_query_impl[2a0ca4be8ec05b8b]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[2a0ca4be8ec05b8b]::query_impl::check_mod_item_types::dynamic_query::{closure#2}::{closure#0}, rustc_middle[835d091ebc4d05d9]::query::erase::Erased<[u8; 0usize]>>
  30:     0x7fab1034f89e - <rustc_query_impl[2a0ca4be8ec05b8b]::query_impl::check_mod_item_types::dynamic_query::{closure#2} as core[ef917bd033b821fa]::ops::function::FnOnce<(rustc_middle[835d091ebc4d05d9]::ty::context::TyCtxt, rustc_span[a69db53e102135]::def_id::LocalDefId)>>::call_once
  31:     0x7fab0ff842ff - rustc_query_system[95ed59712a59403e]::query::plumbing::try_execute_query::<rustc_query_impl[2a0ca4be8ec05b8b]::DynamicConfig<rustc_query_system[95ed59712a59403e]::query::caches::VecCache<rustc_span[a69db53e102135]::def_id::LocalDefId, rustc_middle[835d091ebc4d05d9]::query::erase::Erased<[u8; 0usize]>>, false, false, false>, rustc_query_impl[2a0ca4be8ec05b8b]::plumbing::QueryCtxt, false>
  32:     0x7fab10f82442 - rustc_query_impl[2a0ca4be8ec05b8b]::query_impl::check_mod_item_types::get_query_non_incr::__rust_end_short_backtrace
  33:     0x7fab10a4a727 - <rustc_middle[835d091ebc4d05d9]::hir::map::Map>::for_each_module::<rustc_hir_analysis[dc7bd52400bbf8cf]::check_crate::{closure#6}::{closure#0}>
  34:     0x7fab10a49d7d - <rustc_session[2927e3ab783c954a]::session::Session>::time::<(), rustc_hir_analysis[dc7bd52400bbf8cf]::check_crate::{closure#6}>
  35:     0x7fab10a49ad3 - rustc_hir_analysis[dc7bd52400bbf8cf]::check_crate
  36:     0x7fab10a4926a - rustc_interface[950bb6185283f172]::passes::analysis
  37:     0x7fab10aabf2a - rustc_query_impl[2a0ca4be8ec05b8b]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[2a0ca4be8ec05b8b]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[835d091ebc4d05d9]::query::erase::Erased<[u8; 1usize]>>
  38:     0x7fab10aabf19 - <rustc_query_impl[2a0ca4be8ec05b8b]::query_impl::analysis::dynamic_query::{closure#2} as core[ef917bd033b821fa]::ops::function::FnOnce<(rustc_middle[835d091ebc4d05d9]::ty::context::TyCtxt, ())>>::call_once
  39:     0x7fab10c76f48 - rustc_query_system[95ed59712a59403e]::query::plumbing::try_execute_query::<rustc_query_impl[2a0ca4be8ec05b8b]::DynamicConfig<rustc_query_system[95ed59712a59403e]::query::caches::SingleCache<rustc_middle[835d091ebc4d05d9]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[2a0ca4be8ec05b8b]::plumbing::QueryCtxt, false>
  40:     0x7fab10c76d27 - rustc_query_impl[2a0ca4be8ec05b8b]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  41:     0x7fab108fbe85 - <rustc_middle[835d091ebc4d05d9]::ty::context::GlobalCtxt>::enter::<rustc_driver_impl[5bf76b44b01c010b]::run_compiler::{closure#1}::{closure#2}::{closure#4}, core[ef917bd033b821fa]::result::Result<(), rustc_span[a69db53e102135]::ErrorGuaranteed>>
  42:     0x7fab108fb4b2 - <rustc_interface[950bb6185283f172]::interface::Compiler>::enter::<rustc_driver_impl[5bf76b44b01c010b]::run_compiler::{closure#1}::{closure#2}, core[ef917bd033b821fa]::result::Result<core[ef917bd033b821fa]::option::Option<rustc_interface[950bb6185283f172]::queries::Linker>, rustc_span[a69db53e102135]::ErrorGuaranteed>>
  43:     0x7fab108f4825 - rustc_span[a69db53e102135]::set_source_map::<core[ef917bd033b821fa]::result::Result<(), rustc_span[a69db53e102135]::ErrorGuaranteed>, rustc_interface[950bb6185283f172]::interface::run_compiler<core[ef917bd033b821fa]::result::Result<(), rustc_span[a69db53e102135]::ErrorGuaranteed>, rustc_driver_impl[5bf76b44b01c010b]::run_compiler::{closure#1}>::{closure#0}::{closure#0}>
  44:     0x7fab108f4296 - <scoped_tls[af683b2dcd27050]::ScopedKey<rustc_span[a69db53e102135]::SessionGlobals>>::set::<rustc_interface[950bb6185283f172]::interface::run_compiler<core[ef917bd033b821fa]::result::Result<(), rustc_span[a69db53e102135]::ErrorGuaranteed>, rustc_driver_impl[5bf76b44b01c010b]::run_compiler::{closure#1}>::{closure#0}, core[ef917bd033b821fa]::result::Result<(), rustc_span[a69db53e102135]::ErrorGuaranteed>>
  45:     0x7fab108f385c - std[c0adc0b90f4efda2]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[950bb6185283f172]::util::run_in_thread_pool_with_globals<rustc_interface[950bb6185283f172]::interface::run_compiler<core[ef917bd033b821fa]::result::Result<(), rustc_span[a69db53e102135]::ErrorGuaranteed>, rustc_driver_impl[5bf76b44b01c010b]::run_compiler::{closure#1}>::{closure#0}, core[ef917bd033b821fa]::result::Result<(), rustc_span[a69db53e102135]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[ef917bd033b821fa]::result::Result<(), rustc_span[a69db53e102135]::ErrorGuaranteed>>
  46:     0x7fab108f361e - <<std[c0adc0b90f4efda2]::thread::Builder>::spawn_unchecked_<rustc_interface[950bb6185283f172]::util::run_in_thread_pool_with_globals<rustc_interface[950bb6185283f172]::interface::run_compiler<core[ef917bd033b821fa]::result::Result<(), rustc_span[a69db53e102135]::ErrorGuaranteed>, rustc_driver_impl[5bf76b44b01c010b]::run_compiler::{closure#1}>::{closure#0}, core[ef917bd033b821fa]::result::Result<(), rustc_span[a69db53e102135]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[ef917bd033b821fa]::result::Result<(), rustc_span[a69db53e102135]::ErrorGuaranteed>>::{closure#1} as core[ef917bd033b821fa]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  47:     0x7fab0e371c55 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hee3992ac1361b768
                               at /rustc/0e8e857b11f60a785aea24a84f280f6dad7a4d42/library/alloc/src/boxed.rs:2007:9
  48:     0x7fab0e371c55 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h98eb33f4039b4e2e
                               at /rustc/0e8e857b11f60a785aea24a84f280f6dad7a4d42/library/alloc/src/boxed.rs:2007:9
  49:     0x7fab0e371c55 - std::sys::unix::thread::Thread::new::thread_start::h4a5bbbf722280c2f
                               at /rustc/0e8e857b11f60a785aea24a84f280f6dad7a4d42/library/std/src/sys/unix/thread.rs:108:17
  50:     0x7fab0e10444b - <unknown>
  51:     0x7fab0e187e40 - <unknown>
  52:                0x0 - <unknown>

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 1.73.0-nightly (0e8e857b1 2023-07-16) running on x86_64-unknown-linux-gnu

query stack during panic:
#0 [check_mod_item_types] checking item types in top-level module
#1 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 4 previous errors

Some errors have detailed explanations: E0261, E0601.
For more information about an error, try `rustc --explain E0261`

[compiler-errors]

This needs detailed investigation, and I'd prefer we fully understand why this is resulting in a region error over just adding an is_impl_trait_in_trait check to item_name (or feeding the query).... This probably has to do with the fact that we have a ReError due to the missing region 'a.