ICE: def_collector: no entry found for key

[matthiaskrgr]

snippet:

struct Foo {
    _: union  {
    #[rustfmt::skip]
    f: String
    },
}

Version information

rustc 1.76.0-nightly (8d57ad1ad 2023-11-14)
binary: rustc
commit-hash: 8d57ad1adeb66bc183ee8171b57839656896b7d5
commit-date: 2023-11-14
host: x86_64-unknown-linux-gnu
release: 1.76.0-nightly
LLVM version: 17.0.4

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

Program output

thread 'rustc' panicked at compiler/rustc_resolve/src/def_collector.rs:61:56:
no entry found for key
stack backtrace:
   0:     0x7f73f999289c - std::backtrace_rs::backtrace::libunwind::trace::h31c51c172b60df1f
                               at /rustc/8d57ad1adeb66bc183ee8171b57839656896b7d5/library/std/src/../../backtrace/src/backtrace/libunwind.rs:104:5
   1:     0x7f73f999289c - std::backtrace_rs::backtrace::trace_unsynchronized::he3f7436095f6c268
                               at /rustc/8d57ad1adeb66bc183ee8171b57839656896b7d5/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f73f999289c - std::sys_common::backtrace::_print_fmt::h9ecb16af589a0fbb
                               at /rustc/8d57ad1adeb66bc183ee8171b57839656896b7d5/library/std/src/sys_common/backtrace.rs:67:5
   3:     0x7f73f999289c - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h879345ff56d51582
                               at /rustc/8d57ad1adeb66bc183ee8171b57839656896b7d5/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f73f99e58a0 - core::fmt::rt::Argument::fmt::hf48167ed22d6afa3
                               at /rustc/8d57ad1adeb66bc183ee8171b57839656896b7d5/library/core/src/fmt/rt.rs:142:9
   5:     0x7f73f99e58a0 - core::fmt::write::haf17f643ce868e2d
                               at /rustc/8d57ad1adeb66bc183ee8171b57839656896b7d5/library/core/src/fmt/mod.rs:1120:17
   6:     0x7f73f99867bf - std::io::Write::write_fmt::hea57ebf7fed914ac
                               at /rustc/8d57ad1adeb66bc183ee8171b57839656896b7d5/library/std/src/io/mod.rs:1762:15
   7:     0x7f73f9992684 - std::sys_common::backtrace::_print::hd6cb4ba72955bb4b
                               at /rustc/8d57ad1adeb66bc183ee8171b57839656896b7d5/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7f73f9992684 - std::sys_common::backtrace::print::h4634a5d49ae4175c
                               at /rustc/8d57ad1adeb66bc183ee8171b57839656896b7d5/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7f73f9995317 - std::panicking::default_hook::{{closure}}::h5b815abc8880c45c
  10:     0x7f73f999507f - std::panicking::default_hook::h9fc3db6ef2ff0764
                               at /rustc/8d57ad1adeb66bc183ee8171b57839656896b7d5/library/std/src/panicking.rs:292:9
  11:     0x7f73f66e6c00 - std[4c4ee8ebf0986186]::panicking::update_hook::<alloc[b75c4bd6c90be06c]::boxed::Box<rustc_driver_impl[f2304ccc53dc8b38]::install_ice_hook::{closure#0}>>::{closure#0}
  12:     0x7f73f9995a58 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h0b9450117303d0ca
                               at /rustc/8d57ad1adeb66bc183ee8171b57839656896b7d5/library/alloc/src/boxed.rs:2021:9
  13:     0x7f73f9995a58 - std::panicking::rust_panic_with_hook::h628d6ded0472c14b
                               at /rustc/8d57ad1adeb66bc183ee8171b57839656896b7d5/library/std/src/panicking.rs:783:13
  14:     0x7f73f99957ae - std::panicking::begin_panic_handler::{{closure}}::h66949746e4f54942
                               at /rustc/8d57ad1adeb66bc183ee8171b57839656896b7d5/library/std/src/panicking.rs:657:13
  15:     0x7f73f9992d66 - std::sys_common::backtrace::__rust_end_short_backtrace::h44ec451ae0e12e00
                               at /rustc/8d57ad1adeb66bc183ee8171b57839656896b7d5/library/std/src/sys_common/backtrace.rs:170:18
  16:     0x7f73f9995512 - rust_begin_unwind
                               at /rustc/8d57ad1adeb66bc183ee8171b57839656896b7d5/library/std/src/panicking.rs:645:5
  17:     0x7f73f99e1f85 - core::panicking::panic_fmt::h5b80d414fa976bfc
                               at /rustc/8d57ad1adeb66bc183ee8171b57839656896b7d5/library/core/src/panicking.rs:72:14
  18:     0x7f73f99e1d33 - core::panicking::panic_display::ha511c0ba4b1cda64
                               at /rustc/8d57ad1adeb66bc183ee8171b57839656896b7d5/library/core/src/panicking.rs:178:5
  19:     0x7f73f99e1d33 - core::panicking::panic_str::h62d9420133b896b0
                               at /rustc/8d57ad1adeb66bc183ee8171b57839656896b7d5/library/core/src/panicking.rs:152:5
  20:     0x7f73f99e1d33 - core::option::expect_failed::he876ec0710942e37
                               at /rustc/8d57ad1adeb66bc183ee8171b57839656896b7d5/library/core/src/option.rs:1980:5
  21:     0x7f73f7a82d82 - <rustc_resolve[6a65679376ac23a9]::def_collector::DefCollector>::collect_field
  22:     0x7f73f7a83352 - rustc_ast[e37068419772bcd3]::visit::walk_ty::<rustc_resolve[6a65679376ac23a9]::def_collector::DefCollector>
  23:     0x7f73f7a829ed - <rustc_resolve[6a65679376ac23a9]::def_collector::DefCollector>::collect_field
  24:     0x7f73f7ebd434 - rustc_ast[e37068419772bcd3]::visit::walk_item::<rustc_resolve[6a65679376ac23a9]::def_collector::DefCollector>
  25:     0x7f73f7ebca96 - <rustc_resolve[6a65679376ac23a9]::def_collector::DefCollector as rustc_ast[e37068419772bcd3]::visit::Visitor>::visit_item
  26:     0x7f73f7ebc99e - <rustc_resolve[6a65679376ac23a9]::def_collector::DefCollector as rustc_ast[e37068419772bcd3]::visit::Visitor>::visit_crate
  27:     0x7f73f7ebb07a - <rustc_resolve[6a65679376ac23a9]::Resolver as rustc_expand[12c5afb661d7ae19]::base::ResolverExpand>::visit_ast_fragment_with_placeholders
  28:     0x7f73f7eb75c6 - <rustc_expand[12c5afb661d7ae19]::expand::MacroExpander>::collect_invocations
  29:     0x7f73f83b3d88 - <rustc_expand[12c5afb661d7ae19]::expand::MacroExpander>::fully_expand_fragment
  30:     0x7f73f83b2c2a - <rustc_expand[12c5afb661d7ae19]::expand::MacroExpander>::expand_crate
  31:     0x7f73f8a417f8 - rustc_interface[ed36f66d4dd25afa]::passes::resolver_for_lowering
  32:     0x7f73f8a40bab - rustc_query_impl[c23592c0c653c664]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[c23592c0c653c664]::query_impl::resolver_for_lowering::dynamic_query::{closure#2}::{closure#0}, rustc_middle[69724fdf0a9160]::query::erase::Erased<[u8; 8usize]>>
  33:     0x7f73f86ffbb2 - rustc_query_system[d7212ac5995c6075]::query::plumbing::try_execute_query::<rustc_query_impl[c23592c0c653c664]::DynamicConfig<rustc_query_system[d7212ac5995c6075]::query::caches::SingleCache<rustc_middle[69724fdf0a9160]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[c23592c0c653c664]::plumbing::QueryCtxt, false>
  34:     0x7f73f8700609 - rustc_query_impl[c23592c0c653c664]::query_impl::resolver_for_lowering::get_query_non_incr::__rust_end_short_backtrace
  35:     0x7f73f899e127 - rustc_interface[ed36f66d4dd25afa]::interface::run_compiler::<core[41362f4be93c713f]::result::Result<(), rustc_span[e48a8ae9d6fa383d]::ErrorGuaranteed>, rustc_driver_impl[f2304ccc53dc8b38]::run_compiler::{closure#1}>::{closure#0}
  36:     0x7f73f89a5619 - std[4c4ee8ebf0986186]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[ed36f66d4dd25afa]::util::run_in_thread_with_globals<rustc_interface[ed36f66d4dd25afa]::util::run_in_thread_pool_with_globals<rustc_interface[ed36f66d4dd25afa]::interface::run_compiler<core[41362f4be93c713f]::result::Result<(), rustc_span[e48a8ae9d6fa383d]::ErrorGuaranteed>, rustc_driver_impl[f2304ccc53dc8b38]::run_compiler::{closure#1}>::{closure#0}, core[41362f4be93c713f]::result::Result<(), rustc_span[e48a8ae9d6fa383d]::ErrorGuaranteed>>::{closure#0}, core[41362f4be93c713f]::result::Result<(), rustc_span[e48a8ae9d6fa383d]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[41362f4be93c713f]::result::Result<(), rustc_span[e48a8ae9d6fa383d]::ErrorGuaranteed>>
  37:     0x7f73f89a5443 - <<std[4c4ee8ebf0986186]::thread::Builder>::spawn_unchecked_<rustc_interface[ed36f66d4dd25afa]::util::run_in_thread_with_globals<rustc_interface[ed36f66d4dd25afa]::util::run_in_thread_pool_with_globals<rustc_interface[ed36f66d4dd25afa]::interface::run_compiler<core[41362f4be93c713f]::result::Result<(), rustc_span[e48a8ae9d6fa383d]::ErrorGuaranteed>, rustc_driver_impl[f2304ccc53dc8b38]::run_compiler::{closure#1}>::{closure#0}, core[41362f4be93c713f]::result::Result<(), rustc_span[e48a8ae9d6fa383d]::ErrorGuaranteed>>::{closure#0}, core[41362f4be93c713f]::result::Result<(), rustc_span[e48a8ae9d6fa383d]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[41362f4be93c713f]::result::Result<(), rustc_span[e48a8ae9d6fa383d]::ErrorGuaranteed>>::{closure#1} as core[41362f4be93c713f]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  38:     0x7f73f999f915 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h9a9c2927adaa2592
                               at /rustc/8d57ad1adeb66bc183ee8171b57839656896b7d5/library/alloc/src/boxed.rs:2007:9
  39:     0x7f73f999f915 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h3d4b40c6e2a97503
                               at /rustc/8d57ad1adeb66bc183ee8171b57839656896b7d5/library/alloc/src/boxed.rs:2007:9
  40:     0x7f73f999f915 - std::sys::unix::thread::Thread::new::thread_start::hab0d4f9d960c1874
                               at /rustc/8d57ad1adeb66bc183ee8171b57839656896b7d5/library/std/src/sys/unix/thread.rs:108:17
  41:     0x7f73f38759eb - <unknown>
  42:     0x7f73f38f97cc - <unknown>
  43:                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 1.76.0-nightly (8d57ad1ad 2023-11-14) running on x86_64-unknown-linux-gnu

query stack during panic:
#0 [resolver_for_lowering] getting the resolver for lowering
end of query stack

[matthiaskrgr]

Regression in nightly-2023-08-25

Regression in 18be272

#115131 ping @frank-king

[frank-king]

Got it. It is now being rewritten in #115732, I will add this fmt test.