ICE: `item_name: no name for DefPath`

[matthiaskrgr]

Guess this is the ticket that was never created for #71212 (comment)

auto-reduced (treereduce-rust):

pub mod a {
    #[no_mangle]
    pub static mut FOO: &mut [i32] = &mut [42];
}

fn main() {}

original:

#![feature(const_mut_refs)]
pub mod a {
    #[no_mangle]
    pub static mut FOO: &mut [i32] = &mut [42];
}

pub mod b {
    #[no_mangle]
    pub static mut BAR: &mut [i32] = unsafe { &mut *crate::a::FOO };
}

fn main() {
    unsafe {
        assert_eq!(a::FOO.as_ptr(), b::BAR.as_ptr());
    }
}

Version information

rustc 1.79.0-nightly (ef4936510 2024-03-30)
binary: rustc
commit-hash: ef493651025db2d5c38225c12ef97fd832c00c4a
commit-date: 2024-03-30
host: x86_64-unknown-linux-gnu
release: 1.79.0-nightly
LLVM version: 18.1.2

Command:
/home/matthias/.rustup/toolchains/master/bin/rustc

Program output

error: internal compiler error: compiler/rustc_middle/src/ty/mod.rs:1631:13: item_name: no name for DefPath { data: [DisambiguatedDefPathData { data: TypeNs("a"), disambiguator: 0 }, DisambiguatedDefPathData { data: ValueNs("FOO"), disambiguator: 0 }, DisambiguatedDefPathData { data: AnonConst, disambiguator: 0 }], krate: crate0 }

thread 'rustc' panicked at compiler/rustc_middle/src/ty/mod.rs:1631:13:
Box<dyn Any>
stack backtrace:
   0:     0x7a7c6b5196c5 - std::backtrace_rs::backtrace::libunwind::trace::hc28d290282a0116e
                               at /rustc/ef493651025db2d5c38225c12ef97fd832c00c4a/library/std/src/../../backtrace/src/backtrace/libunwind.rs:105:5
   1:     0x7a7c6b5196c5 - std::backtrace_rs::backtrace::trace_unsynchronized::hea8c781e268ac866
                               at /rustc/ef493651025db2d5c38225c12ef97fd832c00c4a/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7a7c6b5196c5 - std::sys_common::backtrace::_print_fmt::h5968ef18c21ec464
                               at /rustc/ef493651025db2d5c38225c12ef97fd832c00c4a/library/std/src/sys_common/backtrace.rs:68:5
   3:     0x7a7c6b5196c5 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h0e18bed46c2684f7
                               at /rustc/ef493651025db2d5c38225c12ef97fd832c00c4a/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7a7c6b56a74b - core::fmt::rt::Argument::fmt::hbc4e85c7a1c65cbb
                               at /rustc/ef493651025db2d5c38225c12ef97fd832c00c4a/library/core/src/fmt/rt.rs:142:9
   5:     0x7a7c6b56a74b - core::fmt::write::h854a694ad7e22c0c
                               at /rustc/ef493651025db2d5c38225c12ef97fd832c00c4a/library/core/src/fmt/mod.rs:1153:17
   6:     0x7a7c6b50e2af - std::io::Write::write_fmt::h4349e03f9303ee09
                               at /rustc/ef493651025db2d5c38225c12ef97fd832c00c4a/library/std/src/io/mod.rs:1843:15
   7:     0x7a7c6b51949e - std::sys_common::backtrace::_print::h243c83ace43ed33a
                               at /rustc/ef493651025db2d5c38225c12ef97fd832c00c4a/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7a7c6b51949e - std::sys_common::backtrace::print::h2d55f69703150a7b
                               at /rustc/ef493651025db2d5c38225c12ef97fd832c00c4a/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7a7c6b51c149 - std::panicking::default_hook::{{closure}}::h8dc6034aee29decb
  10:     0x7a7c6b51beb3 - std::panicking::default_hook::h56520e57fc8269f5
                               at /rustc/ef493651025db2d5c38225c12ef97fd832c00c4a/library/std/src/panicking.rs:292:9
  11:     0x7a7c67e001de - std[f64e62e47cc83539]::panicking::update_hook::<alloc[bb78173f19f05b74]::boxed::Box<rustc_driver_impl[a4188e147e7947d]::install_ice_hook::{closure#0}>>::{closure#0}
  12:     0x7a7c6b51c84c - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::hea7201e35d9c3ad4
                               at /rustc/ef493651025db2d5c38225c12ef97fd832c00c4a/library/alloc/src/boxed.rs:2032:9
  13:     0x7a7c6b51c84c - std::panicking::rust_panic_with_hook::h2c9c8efc2d7819e0
                               at /rustc/ef493651025db2d5c38225c12ef97fd832c00c4a/library/std/src/panicking.rs:793:13
  14:     0x7a7c67e301a4 - std[f64e62e47cc83539]::panicking::begin_panic::<rustc_errors[7507ac2b93ad6780]::ExplicitBug>::{closure#0}
  15:     0x7a7c67e2cf16 - std[f64e62e47cc83539]::sys_common::backtrace::__rust_end_short_backtrace::<std[f64e62e47cc83539]::panicking::begin_panic<rustc_errors[7507ac2b93ad6780]::ExplicitBug>::{closure#0}, !>
  16:     0x7a7c67e2cbf6 - std[f64e62e47cc83539]::panicking::begin_panic::<rustc_errors[7507ac2b93ad6780]::ExplicitBug>
  17:     0x7a7c67e39401 - <rustc_errors[7507ac2b93ad6780]::diagnostic::BugAbort as rustc_errors[7507ac2b93ad6780]::diagnostic::EmissionGuarantee>::emit_producing_guarantee
  18:     0x7a7c682cdacc - rustc_middle[9869adca887e2ba2]::util::bug::opt_span_bug_fmt::<rustc_span[943c03d33bb8b9a7]::span_encoding::Span>::{closure#0}
  19:     0x7a7c682b0f8a - rustc_middle[9869adca887e2ba2]::ty::context::tls::with_opt::<rustc_middle[9869adca887e2ba2]::util::bug::opt_span_bug_fmt<rustc_span[943c03d33bb8b9a7]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  20:     0x7a7c682b0e2b - rustc_middle[9869adca887e2ba2]::ty::context::tls::with_context_opt::<rustc_middle[9869adca887e2ba2]::ty::context::tls::with_opt<rustc_middle[9869adca887e2ba2]::util::bug::opt_span_bug_fmt<rustc_span[943c03d33bb8b9a7]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  21:     0x7a7c65efea00 - rustc_middle[9869adca887e2ba2]::util::bug::bug_fmt
  22:     0x7a7c6a2ab5a0 - <rustc_middle[9869adca887e2ba2]::ty::context::TyCtxt>::item_name
  23:     0x7a7c6956c9e6 - rustc_symbol_mangling[98f33ffdb70809d3]::symbol_name_provider
  24:     0x7a7c6956acc8 - rustc_query_impl[74fb6ca467066e1c]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[74fb6ca467066e1c]::query_impl::symbol_name::dynamic_query::{closure#2}::{closure#0}, rustc_middle[9869adca887e2ba2]::query::erase::Erased<[u8; 16usize]>>
  25:     0x7a7c69569c64 - rustc_query_system[119b49fc53e45c67]::query::plumbing::try_execute_query::<rustc_query_impl[74fb6ca467066e1c]::DynamicConfig<rustc_query_system[119b49fc53e45c67]::query::caches::DefaultCache<rustc_middle[9869adca887e2ba2]::ty::instance::Instance, rustc_middle[9869adca887e2ba2]::query::erase::Erased<[u8; 16usize]>>, false, false, false>, rustc_query_impl[74fb6ca467066e1c]::plumbing::QueryCtxt, false>
  26:     0x7a7c695698e8 - rustc_query_impl[74fb6ca467066e1c]::query_impl::symbol_name::get_query_non_incr::__rust_end_short_backtrace
  27:     0x7a7c69c87a66 - rustc_middle[9869adca887e2ba2]::query::plumbing::query_get_at::<rustc_query_system[119b49fc53e45c67]::query::caches::DefaultCache<rustc_middle[9869adca887e2ba2]::ty::instance::Instance, rustc_middle[9869adca887e2ba2]::query::erase::Erased<[u8; 16usize]>>>
  28:     0x7a7c69339ba7 - rustc_monomorphize[ad57543fff614c09]::partitioning::assert_symbols_are_distinct::<std[f64e62e47cc83539]::collections::hash::set::Iter<rustc_middle[9869adca887e2ba2]::mir::mono::MonoItem>>
  29:     0x7a7c6a0151ea - rustc_monomorphize[ad57543fff614c09]::partitioning::collect_and_partition_mono_items
  30:     0x7a7c6a0145b0 - rustc_query_impl[74fb6ca467066e1c]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[74fb6ca467066e1c]::query_impl::collect_and_partition_mono_items::dynamic_query::{closure#2}::{closure#0}, rustc_middle[9869adca887e2ba2]::query::erase::Erased<[u8; 24usize]>>
  31:     0x7a7c6a014595 - <rustc_query_impl[74fb6ca467066e1c]::query_impl::collect_and_partition_mono_items::dynamic_query::{closure#2} as core[14e3cd74f4fa99b5]::ops::function::FnOnce<(rustc_middle[9869adca887e2ba2]::ty::context::TyCtxt, ())>>::call_once
  32:     0x7a7c6a013014 - rustc_query_system[119b49fc53e45c67]::query::plumbing::try_execute_query::<rustc_query_impl[74fb6ca467066e1c]::DynamicConfig<rustc_query_system[119b49fc53e45c67]::query::caches::SingleCache<rustc_middle[9869adca887e2ba2]::query::erase::Erased<[u8; 24usize]>>, false, false, false>, rustc_query_impl[74fb6ca467066e1c]::plumbing::QueryCtxt, false>
  33:     0x7a7c6a012d0b - rustc_query_impl[74fb6ca467066e1c]::query_impl::collect_and_partition_mono_items::get_query_non_incr::__rust_end_short_backtrace
  34:     0x7a7c6a0f246a - rustc_codegen_ssa[31ac75f9d021ea0a]::base::codegen_crate::<rustc_codegen_llvm[cf65e4b907d49d9e]::LlvmCodegenBackend>
  35:     0x7a7c6a0e5782 - <rustc_codegen_llvm[cf65e4b907d49d9e]::LlvmCodegenBackend as rustc_codegen_ssa[31ac75f9d021ea0a]::traits::backend::CodegenBackend>::codegen_crate
  36:     0x7a7c6a0e5105 - rustc_interface[dc383db41dd6a1d7]::passes::start_codegen
  37:     0x7a7c6a0e4774 - <rustc_interface[dc383db41dd6a1d7]::queries::Queries>::codegen_and_build_linker
  38:     0x7a7c69e515c4 - rustc_interface[dc383db41dd6a1d7]::interface::run_compiler::<core[14e3cd74f4fa99b5]::result::Result<(), rustc_span[943c03d33bb8b9a7]::ErrorGuaranteed>, rustc_driver_impl[a4188e147e7947d]::run_compiler::{closure#0}>::{closure#0}
  39:     0x7a7c69f7797f - std[f64e62e47cc83539]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[dc383db41dd6a1d7]::util::run_in_thread_with_globals<rustc_interface[dc383db41dd6a1d7]::util::run_in_thread_pool_with_globals<rustc_interface[dc383db41dd6a1d7]::interface::run_compiler<core[14e3cd74f4fa99b5]::result::Result<(), rustc_span[943c03d33bb8b9a7]::ErrorGuaranteed>, rustc_driver_impl[a4188e147e7947d]::run_compiler::{closure#0}>::{closure#0}, core[14e3cd74f4fa99b5]::result::Result<(), rustc_span[943c03d33bb8b9a7]::ErrorGuaranteed>>::{closure#0}, core[14e3cd74f4fa99b5]::result::Result<(), rustc_span[943c03d33bb8b9a7]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[14e3cd74f4fa99b5]::result::Result<(), rustc_span[943c03d33bb8b9a7]::ErrorGuaranteed>>
  40:     0x7a7c69f77772 - <<std[f64e62e47cc83539]::thread::Builder>::spawn_unchecked_<rustc_interface[dc383db41dd6a1d7]::util::run_in_thread_with_globals<rustc_interface[dc383db41dd6a1d7]::util::run_in_thread_pool_with_globals<rustc_interface[dc383db41dd6a1d7]::interface::run_compiler<core[14e3cd74f4fa99b5]::result::Result<(), rustc_span[943c03d33bb8b9a7]::ErrorGuaranteed>, rustc_driver_impl[a4188e147e7947d]::run_compiler::{closure#0}>::{closure#0}, core[14e3cd74f4fa99b5]::result::Result<(), rustc_span[943c03d33bb8b9a7]::ErrorGuaranteed>>::{closure#0}, core[14e3cd74f4fa99b5]::result::Result<(), rustc_span[943c03d33bb8b9a7]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[14e3cd74f4fa99b5]::result::Result<(), rustc_span[943c03d33bb8b9a7]::ErrorGuaranteed>>::{closure#1} as core[14e3cd74f4fa99b5]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  41:     0x7a7c6b5261a9 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h0776fb0ce93ed35e
                               at /rustc/ef493651025db2d5c38225c12ef97fd832c00c4a/library/alloc/src/boxed.rs:2018:9
  42:     0x7a7c6b5261a9 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h0210ee959262dd00
                               at /rustc/ef493651025db2d5c38225c12ef97fd832c00c4a/library/alloc/src/boxed.rs:2018:9
  43:     0x7a7c6b5261a9 - std::sys::pal::unix::thread::Thread::new::thread_start::h3824f8b11b1eb421
                               at /rustc/ef493651025db2d5c38225c12ef97fd832c00c4a/library/std/src/sys/pal/unix/thread.rs:108:17
  44:     0x7a7c64ca955a - <unknown>
  45:     0x7a7c64d26a3c - <unknown>
  46:                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 1.79.0-nightly (ef4936510 2024-03-30) running on x86_64-unknown-linux-gnu

query stack during panic:
#0 [symbol_name] computing the symbol for `a::FOO::{constant#0}`
#1 [collect_and_partition_mono_items] collect_and_partition_mono_items
end of query stack
error: aborting due to 1 previous error

[matthiaskrgr]

Interestingly the original bisects to #121644 which is way younger than the snippet 🤔