Conflicting trait impls cause ICE with `generic_const_exprs`

[Tehforsch]

Code (Playground)

#![allow(incomplete_features)]
#![feature(adt_const_params)]
#![feature(generic_const_exprs)]

use std::ops::Add;

#[derive(PartialEq, Eq, Clone, Debug, core::marker::ConstParamTy)]
pub struct Dimension;

#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Default)]
pub struct Quantity<S, const D: Dimension>(pub(crate) S);

impl<const D: Dimension, LHS, RHS> Add<Quantity<RHS, D>> for Quantity<LHS, D>
where
    LHS: Add<RHS>,
{
    type Output = Quantity<<LHS as Add<RHS>>::Output, D>;
    fn add(self, rhs: Quantity<RHS, D>) -> Self::Output {
        Quantity(self.0 + rhs.0)
    }
}

impl<LHS, RHS> Add<RHS> for Quantity<LHS, { Dimension }>
where
    LHS: Add<RHS>,
{
    type Output = Quantity<<LHS as Add<RHS>>::Output, { Dimension }>;
    fn add(self, rhs: RHS) -> Self::Output {
        Quantity(self.0 + rhs)
    }
}

impl Add<Quantity<f32, { Dimension }>> for f32 {
    type Output = Quantity<f32, { Dimension }>;
    fn add(self, rhs: Quantity<f32, { Dimension }>) -> Self::Output {
        Quantity(self + rhs.0)
    }
}

pub fn add<const U: Dimension>(x: Quantity<f32, U>, y: Quantity<f32, U>) -> Quantity<f32, U> {
    x + y
}

fn main() {
    add(Quantity::<f32, {Dimension}>(1.0), Quantity(2.0));
}

The code should not compile, since the first two trait impls are conflicting. If generic_const_exprs is disabled (it is not needed code-wise in this reduced example, but was necessary in my original code), the compiler gives the correct error message:

error[E0119]: conflicting implementations of trait `Add<Quantity<_, Dimension>>` for type `Quantity<_, Dimension>`
  --> src/main.rs:22:1
   |
12 | / impl<const D: Dimension, LHS, RHS> Add<Quantity<RHS, D>> for Quantity<LHS, D>
13 | | where
14 | |     LHS: Add<RHS>,
   | |__________________- first implementation here
...
22 | / impl<LHS, RHS> Add<RHS> for Quantity<LHS, { Dimension }>
23 | | where
24 | |     LHS: Add<RHS>,
   | |__________________^ conflicting implementation for `Quantity<_, Dimension>`

Note that the even the third trait impl is needed in order to reproduce the ICE. The code compiles fine if either the second or the third trait impl is removed (the first one is actually used, so it cant be removed).

Meta

rustc --version --verbose:

rustc 1.77.0-nightly (d6d7a9386 2023-12-22)
binary: rustc
commit-hash: d6d7a93866f2ffcfb51828b8859bdad760b54ce0
commit-date: 2023-12-22
host: x86_64-unknown-linux-gnu
release: 1.77.0-nightly
LLVM version: 17.0.6

Error output

error: internal compiler error: compiler/rustc_middle/src/ty/instance.rs:414:25: failed to resolve instance for <Quantity<f32, Dimension> as Add>::add: Err(
                                    ErrorGuaranteed(
                                        (),
                                    ),
                                )

thread 'rustc' panicked at /rustc/d6d7a93866f2ffcfb51828b8859bdad760b54ce0/compiler/rustc_errors/src/lib.rs:1122:30:
Box<dyn Any>
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: compiler flags: --crate-type bin -C embed-bitcode=no -C debuginfo=2 -C incremental=[REDACTED]

query stack during panic:
#0 [collect_and_partition_mono_items] collect_and_partition_mono_items
end of query stack

Backtrace

stack backtrace:
   0:     0x7f38a818b6f6 - std::backtrace_rs::backtrace::libunwind::trace::h4c39d39dfbe9783d
                               at /rustc/d6d7a93866f2ffcfb51828b8859bdad760b54ce0/library/std/src/../../backtrace/src/backtrace/libunwind.rs:104:5
   1:     0x7f38a818b6f6 - std::backtrace_rs::backtrace::trace_unsynchronized::h4dc8ace54ae311e5
                               at /rustc/d6d7a93866f2ffcfb51828b8859bdad760b54ce0/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f38a818b6f6 - std::sys_common::backtrace::_print_fmt::hb93bb30078f88f5e
                               at /rustc/d6d7a93866f2ffcfb51828b8859bdad760b54ce0/library/std/src/sys_common/backtrace.rs:68:5
   3:     0x7f38a818b6f6 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hc0a088b7e0825f6a
                               at /rustc/d6d7a93866f2ffcfb51828b8859bdad760b54ce0/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f38a81ddf40 - core::fmt::rt::Argument::fmt::h3bf37701eb7e7bdb
                               at /rustc/d6d7a93866f2ffcfb51828b8859bdad760b54ce0/library/core/src/fmt/rt.rs:142:9
   5:     0x7f38a81ddf40 - core::fmt::write::h7e6ab5f6daf5c422
                               at /rustc/d6d7a93866f2ffcfb51828b8859bdad760b54ce0/library/core/src/fmt/mod.rs:1120:17
   6:     0x7f38a817f4af - std::io::Write::write_fmt::h08c3306cb5bf723d
                               at /rustc/d6d7a93866f2ffcfb51828b8859bdad760b54ce0/library/std/src/io/mod.rs:1810:15
   7:     0x7f38a818b4d4 - std::sys_common::backtrace::_print::hafed43d2fa285a46
                               at /rustc/d6d7a93866f2ffcfb51828b8859bdad760b54ce0/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7f38a818b4d4 - std::sys_common::backtrace::print::h39c23a58558ca2e2
                               at /rustc/d6d7a93866f2ffcfb51828b8859bdad760b54ce0/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7f38a818e267 - std::panicking::default_hook::{{closure}}::h33423deafbc8e615
  10:     0x7f38a818dfc9 - std::panicking::default_hook::h50ae27bf0009ee3b
                               at /rustc/d6d7a93866f2ffcfb51828b8859bdad760b54ce0/library/std/src/panicking.rs:292:9
  11:     0x7f38aaf82ccc - std[3a009c5aa3cd6e18]::panicking::update_hook::<alloc[7046a3554d0212f6]::boxed::Box<rustc_driver_impl[99e8362fbaa298ef]::install_ice_hook::{closure#0}>>::{closure#0}
  12:     0x7f38a818e9b6 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h5ddf83902817cab1
                               at /rustc/d6d7a93866f2ffcfb51828b8859bdad760b54ce0/library/alloc/src/boxed.rs:2029:9
  13:     0x7f38a818e9b6 - std::panicking::rust_panic_with_hook::hbc586ac9df6b73a8
                               at /rustc/d6d7a93866f2ffcfb51828b8859bdad760b54ce0/library/std/src/panicking.rs:783:13
  14:     0x7f38aafbbcd4 - std[3a009c5aa3cd6e18]::panicking::begin_panic::<rustc_errors[f488520a7868b61e]::ExplicitBug>::{closure#0}
  15:     0x7f38aafb8506 - std[3a009c5aa3cd6e18]::sys_common::backtrace::__rust_end_short_backtrace::<std[3a009c5aa3cd6e18]::panicking::begin_panic<rustc_errors[f488520a7868b61e]::ExplicitBug>::{closure#0}, !>
  16:     0x7f38aafb7eb6 - std[3a009c5aa3cd6e18]::panicking::begin_panic::<rustc_errors[f488520a7868b61e]::ExplicitBug>
  17:     0x7f38aafc6f01 - <rustc_errors[f488520a7868b61e]::diagnostic_builder::BugAbort as rustc_errors[f488520a7868b61e]::diagnostic_builder::EmissionGuarantee>::emit_producing_guarantee
  18:     0x7f38ab39ee8f - <rustc_errors[f488520a7868b61e]::DiagCtxt>::bug::<alloc[7046a3554d0212f6]::string::String>
  19:     0x7f38ab43aa1b - rustc_middle[8402766bc0d86440]::util::bug::opt_span_bug_fmt::<rustc_span[fa12e73b1270738]::span_encoding::Span>::{closure#0}
  20:     0x7f38ab423d9a - rustc_middle[8402766bc0d86440]::ty::context::tls::with_opt::<rustc_middle[8402766bc0d86440]::util::bug::opt_span_bug_fmt<rustc_span[fa12e73b1270738]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  21:     0x7f38ab423c38 - rustc_middle[8402766bc0d86440]::ty::context::tls::with_context_opt::<rustc_middle[8402766bc0d86440]::ty::context::tls::with_opt<rustc_middle[8402766bc0d86440]::util::bug::opt_span_bug_fmt<rustc_span[fa12e73b1270738]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  22:     0x7f38a939e400 - rustc_middle[8402766bc0d86440]::util::bug::bug_fmt
  23:     0x7f38ac4778b8 - <rustc_middle[8402766bc0d86440]::ty::instance::Instance>::expect_resolve
  24:     0x7f38aa11a260 - rustc_monomorphize[87b7e1563872e463]::collector::collect_items_rec::{closure#0}
  25:     0x7f38ad116156 - rustc_monomorphize[87b7e1563872e463]::collector::collect_items_rec
  26:     0x7f38ad116654 - rustc_monomorphize[87b7e1563872e463]::collector::collect_items_rec
  27:     0x7f38ad111c3e - rustc_monomorphize[87b7e1563872e463]::partitioning::collect_and_partition_mono_items
  28:     0x7f38ad1111b0 - rustc_query_impl[a5b594d180e67741]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[a5b594d180e67741]::query_impl::collect_and_partition_mono_items::dynamic_query::{closure#2}::{closure#0}, rustc_middle[8402766bc0d86440]::query::erase::Erased<[u8; 24usize]>>
  29:     0x7f38ad111195 - <rustc_query_impl[a5b594d180e67741]::query_impl::collect_and_partition_mono_items::dynamic_query::{closure#2} as core[2b984803ee3f5e21]::ops::function::FnOnce<(rustc_middle[8402766bc0d86440]::ty::context::TyCtxt, ())>>::call_once
  30:     0x7f38ad10f9b7 - rustc_query_system[f0f2c4fcd6daa9a]::query::plumbing::try_execute_query::<rustc_query_impl[a5b594d180e67741]::DynamicConfig<rustc_query_system[f0f2c4fcd6daa9a]::query::caches::SingleCache<rustc_middle[8402766bc0d86440]::query::erase::Erased<[u8; 24usize]>>, false, false, false>, rustc_query_impl[a5b594d180e67741]::plumbing::QueryCtxt, true>
  31:     0x7f38ad2b5db3 - rustc_query_impl[a5b594d180e67741]::query_impl::collect_and_partition_mono_items::get_query_incr::__rust_end_short_backtrace
  32:     0x7f38acbab696 - rustc_codegen_ssa[daa1c997743eea6f]::base::codegen_crate::<rustc_codegen_llvm[e6316feb9c2ceeb]::LlvmCodegenBackend>
  33:     0x7f38acbab335 - <rustc_codegen_llvm[e6316feb9c2ceeb]::LlvmCodegenBackend as rustc_codegen_ssa[daa1c997743eea6f]::traits::backend::CodegenBackend>::codegen_crate
  34:     0x7f38acba95ed - rustc_interface[dfee6d40a3df20bb]::passes::start_codegen
  35:     0x7f38acba8d78 - <rustc_interface[dfee6d40a3df20bb]::queries::Queries>::codegen_and_build_linker
  36:     0x7f38ad19f2a8 - rustc_interface[dfee6d40a3df20bb]::interface::run_compiler::<core[2b984803ee3f5e21]::result::Result<(), rustc_span[fa12e73b1270738]::ErrorGuaranteed>, rustc_driver_impl[99e8362fbaa298ef]::run_compiler::{closure#0}>::{closure#0}
  37:     0x7f38ad125346 - std[3a009c5aa3cd6e18]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[dfee6d40a3df20bb]::util::run_in_thread_with_globals<rustc_interface[dfee6d40a3df20bb]::util::run_in_thread_pool_with_globals<rustc_interface[dfee6d40a3df20bb]::interface::run_compiler<core[2b984803ee3f5e21]::result::Result<(), rustc_span[fa12e73b1270738]::ErrorGuaranteed>, rustc_driver_impl[99e8362fbaa298ef]::run_compiler::{closure#0}>::{closure#0}, core[2b984803ee3f5e21]::result::Result<(), rustc_span[fa12e73b1270738]::ErrorGuaranteed>>::{closure#0}, core[2b984803ee3f5e21]::result::Result<(), rustc_span[fa12e73b1270738]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[2b984803ee3f5e21]::result::Result<(), rustc_span[fa12e73b1270738]::ErrorGuaranteed>>
  38:     0x7f38ad125173 - <<std[3a009c5aa3cd6e18]::thread::Builder>::spawn_unchecked_<rustc_interface[dfee6d40a3df20bb]::util::run_in_thread_with_globals<rustc_interface[dfee6d40a3df20bb]::util::run_in_thread_pool_with_globals<rustc_interface[dfee6d40a3df20bb]::interface::run_compiler<core[2b984803ee3f5e21]::result::Result<(), rustc_span[fa12e73b1270738]::ErrorGuaranteed>, rustc_driver_impl[99e8362fbaa298ef]::run_compiler::{closure#0}>::{closure#0}, core[2b984803ee3f5e21]::result::Result<(), rustc_span[fa12e73b1270738]::ErrorGuaranteed>>::{closure#0}, core[2b984803ee3f5e21]::result::Result<(), rustc_span[fa12e73b1270738]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[2b984803ee3f5e21]::result::Result<(), rustc_span[fa12e73b1270738]::ErrorGuaranteed>>::{closure#1} as core[2b984803ee3f5e21]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  39:     0x7f38a81988e5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h446fa4c55b1bf8c4
                               at /rustc/d6d7a93866f2ffcfb51828b8859bdad760b54ce0/library/alloc/src/boxed.rs:2015:9
  40:     0x7f38a81988e5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hb661ed53115c5033
                               at /rustc/d6d7a93866f2ffcfb51828b8859bdad760b54ce0/library/alloc/src/boxed.rs:2015:9
  41:     0x7f38a81988e5 - std::sys::unix::thread::Thread::new::thread_start::hbd74c47d36330101
                               at /rustc/d6d7a93866f2ffcfb51828b8859bdad760b54ce0/library/std/src/sys/unix/thread.rs:108:17
  42:     0x7f38a7f5a9eb - <unknown>
  43:     0x7f38a7fde7cc - <unknown>
  44:                0x0 - <unknown>

rustc-ice-2024-01-07T13_58_40-55799.txt

[matthiaskrgr]

Bisects to #119148
edit: oops, tested against the wrong code
bisects to nightly-2023-05-18

found 7 bors merge commits in the specified range
commit[0] 2023-05-16: Auto merge of #111650 - matthiaskrgr:rollup-n7w17v4, r=matthiaskrgr
commit[1] 2023-05-16: Auto merge of #111556 - cjgillot:copy-prop-nrvo, r=oli-obk
commit[2] 2023-05-17: Auto merge of #111664 - weihanglo:update-cargo, r=weihanglo
commit[3] 2023-05-17: Auto merge of #111630 - BoxyUwU:ty_const_debug_formatting, r=compiler-errors
commit[4] 2023-05-17: Auto merge of #111671 - Dylan-DPC:rollup-1jy5r16, r=Dylan-DPC
commit[5] 2023-05-17: Auto merge of #111680 - Dylan-DPC:rollup-1p45gxt, r=Dylan-DPC
commit[6] 2023-05-17: Auto merge of #111568 - scottmcm:undo-opt, r=WaffleLapkin
ERROR: no CI builds available between e77366b and e9e1bbc within last 167 days

[jieyouxu]

@rustbot label +requires-incomplete-features +F-adt_const_params +F-generic_const_exprs +requires-nightly -needs-triage

[workingjubilee]

Much better minimization found by @pacak and @theemathas in #126078:

#![feature(generic_const_exprs)]
#![allow(incomplete_features)]

trait Array {
    const SIZE: usize;
}
impl<const N: usize> Array for [i32; N] {
    const SIZE: usize = N;
}

// Note: Overlapping impls not detected by compiler
trait Reflexive<T> {
    fn reflexive() {}
}
impl<T> Reflexive<T> for T {}
impl<A: Array> Reflexive<[i32; A::SIZE]> for A {}

fn do_reflexive<const N: usize>() {
    <[i32; N]>::reflexive();
}
// Note: Load-bearing `pub`. Removing the pub stops the ICE.
pub fn what() {
    do_reflexive::<0>()
}

Compiler error

   Compiling playground v0.0.1 (/playground)
error: internal compiler error: compiler/rustc_middle/src/ty/instance.rs:510:25: failed to resolve instance for <[i32; 0] as Reflexive<[i32; 0]>>::reflexive: Ok(
                                    None,
                                )

thread 'rustc' panicked at compiler/rustc_middle/src/ty/instance.rs:510:25:
Box<dyn Any>
stack backtrace:
   0:     0x7f5499f58f15 - std::backtrace_rs::backtrace::libunwind::trace::h7d3c800091db3e91
                               at /rustc/804421dff5542c9c7da5c60257b5dbc849719505/library/std/src/../../backtrace/src/backtrace/libunwind.rs:116:5
   1:     0x7f5499f58f15 - std::backtrace_rs::backtrace::trace_unsynchronized::h4cc0a280c32586b8
                               at /rustc/804421dff5542c9c7da5c60257b5dbc849719505/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f5499f58f15 - std::sys_common::backtrace::_print_fmt::h9005d7a683a6d7a4
                               at /rustc/804421dff5542c9c7da5c60257b5dbc849719505/library/std/src/sys_common/backtrace.rs:68:5
   3:     0x7f5499f58f15 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h519c17d5956798a6
                               at /rustc/804421dff5542c9c7da5c60257b5dbc849719505/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f5499fa9c5b - core::fmt::rt::Argument::fmt::haa193bfc28a485eb
                               at /rustc/804421dff5542c9c7da5c60257b5dbc849719505/library/core/src/fmt/rt.rs:165:63
   5:     0x7f5499fa9c5b - core::fmt::write::h355a93f02c4b3ea1
                               at /rustc/804421dff5542c9c7da5c60257b5dbc849719505/library/core/src/fmt/mod.rs:1168:21
   6:     0x7f5499f4dc9f - std::io::Write::write_fmt::hbe0fd00858f9c1ec
                               at /rustc/804421dff5542c9c7da5c60257b5dbc849719505/library/std/src/io/mod.rs:1835:15
   7:     0x7f5499f58cee - std::sys_common::backtrace::_print::h7fe7f477e21fa361
                               at /rustc/804421dff5542c9c7da5c60257b5dbc849719505/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7f5499f58cee - std::sys_common::backtrace::print::h6c8dafcb53369ea1
                               at /rustc/804421dff5542c9c7da5c60257b5dbc849719505/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7f5499f5b729 - std::panicking::default_hook::{{closure}}::hbcbc771124e8a531
  10:     0x7f5499f5b4ca - std::panicking::default_hook::ha99c0605f25db782
                               at /rustc/804421dff5542c9c7da5c60257b5dbc849719505/library/std/src/panicking.rs:298:9
  11:     0x7f549d1a4a00 - std[59958118404e088f]::panicking::update_hook::<alloc[25fe46b0aaca8953]::boxed::Box<rustc_driver_impl[2627b6be84d2f0c]::install_ice_hook::{closure#0}>>::{closure#0}
  12:     0x7f5499f5be5b - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h4e37e0de343f25a5
                               at /rustc/804421dff5542c9c7da5c60257b5dbc849719505/library/alloc/src/boxed.rs:2077:9
  13:     0x7f5499f5be5b - std::panicking::rust_panic_with_hook::h6b51162bdfe57bbe
                               at /rustc/804421dff5542c9c7da5c60257b5dbc849719505/library/std/src/panicking.rs:799:13
  14:     0x7f549d1d5224 - std[59958118404e088f]::panicking::begin_panic::<rustc_errors[2ff0989c1584c7c0]::ExplicitBug>::{closure#0}
  15:     0x7f549d1d1d06 - std[59958118404e088f]::sys_common::backtrace::__rust_end_short_backtrace::<std[59958118404e088f]::panicking::begin_panic<rustc_errors[2ff0989c1584c7c0]::ExplicitBug>::{closure#0}, !>
  16:     0x7f549d1cd116 - std[59958118404e088f]::panicking::begin_panic::<rustc_errors[2ff0989c1584c7c0]::ExplicitBug>
  17:     0x7f549d1de841 - <rustc_errors[2ff0989c1584c7c0]::diagnostic::BugAbort as rustc_errors[2ff0989c1584c7c0]::diagnostic::EmissionGuarantee>::emit_producing_guarantee
  18:     0x7f549d6bb04c - rustc_middle[ce3fbd8192a3c5ff]::util::bug::opt_span_bug_fmt::<rustc_span[6bc65aeac19990f8]::span_encoding::Span>::{closure#0}
  19:     0x7f549d6a487a - rustc_middle[ce3fbd8192a3c5ff]::ty::context::tls::with_opt::<rustc_middle[ce3fbd8192a3c5ff]::util::bug::opt_span_bug_fmt<rustc_span[6bc65aeac19990f8]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  20:     0x7f549d6a46fb - rustc_middle[ce3fbd8192a3c5ff]::ty::context::tls::with_context_opt::<rustc_middle[ce3fbd8192a3c5ff]::ty::context::tls::with_opt<rustc_middle[ce3fbd8192a3c5ff]::util::bug::opt_span_bug_fmt<rustc_span[6bc65aeac19990f8]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  21:     0x7f549bb5dd70 - rustc_middle[ce3fbd8192a3c5ff]::util::bug::bug_fmt
  22:     0x7f549eb00f42 - <rustc_middle[ce3fbd8192a3c5ff]::ty::instance::Instance>::expect_resolve
  23:     0x7f549f3f7d5f - rustc_monomorphize[b056ba09cdf9a699]::collector::collect_items_rec::{closure#0}
  24:     0x7f549e66637f - rustc_monomorphize[b056ba09cdf9a699]::collector::collect_items_rec
  25:     0x7f549e666af6 - rustc_monomorphize[b056ba09cdf9a699]::collector::collect_items_rec
  26:     0x7f549effee27 - rustc_monomorphize[b056ba09cdf9a699]::partitioning::collect_and_partition_mono_items
  27:     0x7f549f3d3364 - rustc_query_impl[9fa61a5fc93b94b6]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[9fa61a5fc93b94b6]::query_impl::collect_and_partition_mono_items::dynamic_query::{closure#2}::{closure#0}, rustc_middle[ce3fbd8192a3c5ff]::query::erase::Erased<[u8; 24usize]>>
  28:     0x7f549f3d3349 - <rustc_query_impl[9fa61a5fc93b94b6]::query_impl::collect_and_partition_mono_items::dynamic_query::{closure#2} as core[666eafb1203b88c6]::ops::function::FnOnce<(rustc_middle[ce3fbd8192a3c5ff]::ty::context::TyCtxt, ())>>::call_once
  29:     0x7f549f3d2f08 - rustc_query_system[8cc4c292d92d3869]::query::plumbing::try_execute_query::<rustc_query_impl[9fa61a5fc93b94b6]::DynamicConfig<rustc_query_system[8cc4c292d92d3869]::query::caches::SingleCache<rustc_middle[ce3fbd8192a3c5ff]::query::erase::Erased<[u8; 24usize]>>, false, false, false>, rustc_query_impl[9fa61a5fc93b94b6]::plumbing::QueryCtxt, false>
  30:     0x7f549f3d2c21 - rustc_query_impl[9fa61a5fc93b94b6]::query_impl::collect_and_partition_mono_items::get_query_non_incr::__rust_end_short_backtrace
  31:     0x7f549f0af509 - rustc_codegen_ssa[7de31db090aae023]::back::symbol_export::exported_symbols_provider_local
  32:     0x7f549e7533a5 - rustc_query_impl[9fa61a5fc93b94b6]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[9fa61a5fc93b94b6]::query_impl::exported_symbols::dynamic_query::{closure#2}::{closure#0}, rustc_middle[ce3fbd8192a3c5ff]::query::erase::Erased<[u8; 16usize]>>
  33:     0x7f549e753373 - <rustc_query_impl[9fa61a5fc93b94b6]::query_impl::exported_symbols::dynamic_query::{closure#2} as core[666eafb1203b88c6]::ops::function::FnOnce<(rustc_middle[ce3fbd8192a3c5ff]::ty::context::TyCtxt, rustc_span[6bc65aeac19990f8]::def_id::CrateNum)>>::call_once
  34:     0x7f549f23b4b1 - rustc_query_system[8cc4c292d92d3869]::query::plumbing::try_execute_query::<rustc_query_impl[9fa61a5fc93b94b6]::DynamicConfig<rustc_query_system[8cc4c292d92d3869]::query::caches::VecCache<rustc_span[6bc65aeac19990f8]::def_id::CrateNum, rustc_middle[ce3fbd8192a3c5ff]::query::erase::Erased<[u8; 16usize]>>, false, false, false>, rustc_query_impl[9fa61a5fc93b94b6]::plumbing::QueryCtxt, false>
  35:     0x7f549f23b0ab - rustc_query_impl[9fa61a5fc93b94b6]::query_impl::exported_symbols::get_query_non_incr::__rust_end_short_backtrace
  36:     0x7f549f23adec - rustc_middle[ce3fbd8192a3c5ff]::query::plumbing::query_get_at::<rustc_query_system[8cc4c292d92d3869]::query::caches::VecCache<rustc_span[6bc65aeac19990f8]::def_id::CrateNum, rustc_middle[ce3fbd8192a3c5ff]::query::erase::Erased<[u8; 16usize]>>>
  37:     0x7f549ed6e9c0 - <rustc_metadata[d6f8184ef093beb3]::rmeta::encoder::EncodeContext>::encode_crate_root
  38:     0x7f549f5ef046 - rustc_metadata[d6f8184ef093beb3]::rmeta::encoder::encode_metadata
  39:     0x7f549f4255b2 - rustc_metadata[d6f8184ef093beb3]::fs::encode_and_write_metadata
  40:     0x7f549f42405e - rustc_interface[ed174d428a840afd]::passes::start_codegen
  41:     0x7f549f4237a8 - <rustc_interface[ed174d428a840afd]::queries::Queries>::codegen_and_build_linker
  42:     0x7f549f242332 - rustc_interface[ed174d428a840afd]::interface::run_compiler::<core[666eafb1203b88c6]::result::Result<(), rustc_span[6bc65aeac19990f8]::ErrorGuaranteed>, rustc_driver_impl[2627b6be84d2f0c]::run_compiler::{closure#0}>::{closure#1}
  43:     0x7f549f1f6009 - std[59958118404e088f]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[ed174d428a840afd]::util::run_in_thread_with_globals<rustc_interface[ed174d428a840afd]::util::run_in_thread_pool_with_globals<rustc_interface[ed174d428a840afd]::interface::run_compiler<core[666eafb1203b88c6]::result::Result<(), rustc_span[6bc65aeac19990f8]::ErrorGuaranteed>, rustc_driver_impl[2627b6be84d2f0c]::run_compiler::{closure#0}>::{closure#1}, core[666eafb1203b88c6]::result::Result<(), rustc_span[6bc65aeac19990f8]::ErrorGuaranteed>>::{closure#0}, core[666eafb1203b88c6]::result::Result<(), rustc_span[6bc65aeac19990f8]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[666eafb1203b88c6]::result::Result<(), rustc_span[6bc65aeac19990f8]::ErrorGuaranteed>>
  44:     0x7f549f1f5dc0 - <<std[59958118404e088f]::thread::Builder>::spawn_unchecked_<rustc_interface[ed174d428a840afd]::util::run_in_thread_with_globals<rustc_interface[ed174d428a840afd]::util::run_in_thread_pool_with_globals<rustc_interface[ed174d428a840afd]::interface::run_compiler<core[666eafb1203b88c6]::result::Result<(), rustc_span[6bc65aeac19990f8]::ErrorGuaranteed>, rustc_driver_impl[2627b6be84d2f0c]::run_compiler::{closure#0}>::{closure#1}, core[666eafb1203b88c6]::result::Result<(), rustc_span[6bc65aeac19990f8]::ErrorGuaranteed>>::{closure#0}, core[666eafb1203b88c6]::result::Result<(), rustc_span[6bc65aeac19990f8]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[666eafb1203b88c6]::result::Result<(), rustc_span[6bc65aeac19990f8]::ErrorGuaranteed>>::{closure#2} as core[666eafb1203b88c6]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  45:     0x7f5499f65e4b - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h1f264a7d3d0a179d
                               at /rustc/804421dff5542c9c7da5c60257b5dbc849719505/library/alloc/src/boxed.rs:2063:9
  46:     0x7f5499f65e4b - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h137c7bc9bcca4c45
                               at /rustc/804421dff5542c9c7da5c60257b5dbc849719505/library/alloc/src/boxed.rs:2063:9
  47:     0x7f5499f65e4b - std::sys::pal::unix::thread::Thread::new::thread_start::hf2fbd4f8eae045d7
                               at /rustc/804421dff5542c9c7da5c60257b5dbc849719505/library/std/src/sys/pal/unix/thread.rs:108:17
  48:     0x7f5499e73609 - start_thread
  49:     0x7f5499d96353 - clone
  50:                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: please make sure that you have updated to the latest nightly

note: please attach the file at `/playground/rustc-ice-2024-06-08T09_09_04-50.txt` to your bug report

note: compiler flags: --crate-type lib -C embed-bitcode=no -C codegen-units=1 -C debuginfo=2

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

query stack during panic:
#0 [collect_and_partition_mono_items] collect_and_partition_mono_items
#1 [exported_symbols] collecting exported symbols for crate `0`
end of query stack
error: could not compile `playground` (lib)