ICE: unnamed fields: `internal compiler error: could not resolve DefId` #126969

matthiaskrgr · 2024-06-25T20:05:47Z

auto-reduced (treereduce-rust):

struct S<T> {
    _: union { t: T },
}

fn f(S::<&i8> { .. }: S<&i8>) {}

fn main() {}

original:

//@ check-pass

struct S<T> {
            _: union { t: T },
        }

fn f(S::<&i8> { .. }: S<&i8>) {}

fn main() {
    f(S { _t: &42_i8 });
}

Version information

rustc 1.81.0-nightly (d929a42a6 2024-06-25)
binary: rustc
commit-hash: d929a42a664c026167800801b26d734db925314f
commit-date: 2024-06-25
host: x86_64-unknown-linux-gnu
release: 1.81.0-nightly
LLVM version: 18.1.7

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

Program output

error[E0658]: unnamed fields are not yet fully implemented
 --> /tmp/icemaker_global_tempdir.59Om17fnRflv/rustc_testrunner_tmpdir_reporting.OlpKHT78ftbD/mvce.rs:2:5
  |
2 |     _: union { t: T },
  |     ^
  |
  = note: see issue #49804 <https://github.com/rust-lang/rust/issues/49804> for more information
  = help: add `#![feature(unnamed_fields)]` to the crate attributes to enable
  = note: this compiler was built on 2024-06-25; consider upgrading it if it is out of date

error[E0658]: unnamed fields are not yet fully implemented
 --> /tmp/icemaker_global_tempdir.59Om17fnRflv/rustc_testrunner_tmpdir_reporting.OlpKHT78ftbD/mvce.rs:2:8
  |
2 |     _: union { t: T },
  |        ^^^^^^^^^^^^^^
  |
  = note: see issue #49804 <https://github.com/rust-lang/rust/issues/49804> for more information
  = help: add `#![feature(unnamed_fields)]` to the crate attributes to enable
  = note: this compiler was built on 2024-06-25; consider upgrading it if it is out of date

error: internal compiler error: could not resolve DefId(0:4 ~ mvce[81cb]::S::T)
 --> /tmp/icemaker_global_tempdir.59Om17fnRflv/rustc_testrunner_tmpdir_reporting.OlpKHT78ftbD/mvce.rs:2:19
  |
2 |     _: union { t: T },
  |                   ^

thread 'rustc' panicked at compiler/rustc_hir_analysis/src/collect/resolve_bound_vars.rs:1461:14:
Box<dyn Any>
stack backtrace:
   0:     0x7ae2e7f1d2e5 - std::backtrace_rs::backtrace::libunwind::trace::h3816f17667167091
                               at /rustc/d929a42a664c026167800801b26d734db925314f/library/std/src/../../backtrace/src/backtrace/libunwind.rs:116:5
   1:     0x7ae2e7f1d2e5 - std::backtrace_rs::backtrace::trace_unsynchronized::h05c1a74390e79138
                               at /rustc/d929a42a664c026167800801b26d734db925314f/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7ae2e7f1d2e5 - std::sys::backtrace::_print_fmt::hf9f67f450e2340b3
                               at /rustc/d929a42a664c026167800801b26d734db925314f/library/std/src/sys/backtrace.rs:68:5
   3:     0x7ae2e7f1d2e5 - <std::sys::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hd0470f4740d6f066
                               at /rustc/d929a42a664c026167800801b26d734db925314f/library/std/src/sys/backtrace.rs:44:22
   4:     0x7ae2e7f6cceb - core::fmt::rt::Argument::fmt::h70b8a6b09781c530
                               at /rustc/d929a42a664c026167800801b26d734db925314f/library/core/src/fmt/rt.rs:165:63
   5:     0x7ae2e7f6cceb - core::fmt::write::hafea0839d2bbb3f2
                               at /rustc/d929a42a664c026167800801b26d734db925314f/library/core/src/fmt/mod.rs:1168:21
   6:     0x7ae2e7f11f6f - std::io::Write::write_fmt::h781fa7911c53c2fa
                               at /rustc/d929a42a664c026167800801b26d734db925314f/library/std/src/io/mod.rs:1835:15
   7:     0x7ae2e7f1d0be - std::sys::backtrace::_print::h864675b81ca0e917
                               at /rustc/d929a42a664c026167800801b26d734db925314f/library/std/src/sys/backtrace.rs:47:5
   8:     0x7ae2e7f1d0be - std::sys::backtrace::print::h077604854516c949
                               at /rustc/d929a42a664c026167800801b26d734db925314f/library/std/src/sys/backtrace.rs:34:9
   9:     0x7ae2e7f1fa09 - std::panicking::default_hook::{{closure}}::h0655bbcac1b3559e
  10:     0x7ae2e7f1f7ac - std::panicking::default_hook::ha9e013cc76e074dd
                               at /rustc/d929a42a664c026167800801b26d734db925314f/library/std/src/panicking.rs:292:9
  11:     0x7ae2e43eac90 - std[e6dd88f179d4d596]::panicking::update_hook::<alloc[7519215c1642967c]::boxed::Box<rustc_driver_impl[6d6094f07793e4a9]::install_ice_hook::{closure#0}>>::{closure#0}
  12:     0x7ae2e7f202df - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::haac7baf64299a07d
                               at /rustc/d929a42a664c026167800801b26d734db925314f/library/alloc/src/boxed.rs:2078:9
  13:     0x7ae2e7f202df - std::panicking::rust_panic_with_hook::h9bfa469549e655b8
                               at /rustc/d929a42a664c026167800801b26d734db925314f/library/std/src/panicking.rs:804:13
  14:     0x7ae2e4424711 - std[e6dd88f179d4d596]::panicking::begin_panic::<rustc_errors[87fc00edeecce55a]::ExplicitBug>::{closure#0}
  15:     0x7ae2e4417b76 - std[e6dd88f179d4d596]::sys::backtrace::__rust_end_short_backtrace::<std[e6dd88f179d4d596]::panicking::begin_panic<rustc_errors[87fc00edeecce55a]::ExplicitBug>::{closure#0}, !>
  16:     0x7ae2e4417b26 - std[e6dd88f179d4d596]::panicking::begin_panic::<rustc_errors[87fc00edeecce55a]::ExplicitBug>
  17:     0x7ae2e442d2c1 - <rustc_errors[87fc00edeecce55a]::diagnostic::BugAbort as rustc_errors[87fc00edeecce55a]::diagnostic::EmissionGuarantee>::emit_producing_guarantee
  18:     0x7ae2e44b2398 - <rustc_errors[87fc00edeecce55a]::DiagCtxtHandle>::span_bug::<rustc_span[31538c27a715cd64]::span_encoding::Span, alloc[7519215c1642967c]::string::String>
  19:     0x7ae2e6189478 - <rustc_hir_analysis[6239ffc5e5ec24c9]::collect::resolve_bound_vars::BoundVarContext>::resolve_type_ref
  20:     0x7ae2e2f7a430 - rustc_hir[ca0bf1aa5980ff5d]::intravisit::walk_qpath::<rustc_hir_analysis[6239ffc5e5ec24c9]::collect::resolve_bound_vars::BoundVarContext>
  21:     0x7ae2e618efd1 - rustc_hir[ca0bf1aa5980ff5d]::intravisit::walk_item::<rustc_hir_analysis[6239ffc5e5ec24c9]::collect::resolve_bound_vars::BoundVarContext>
  22:     0x7ae2e618e19a - <rustc_hir_analysis[6239ffc5e5ec24c9]::collect::resolve_bound_vars::BoundVarContext as rustc_hir[ca0bf1aa5980ff5d]::intravisit::Visitor>::visit_item
  23:     0x7ae2e61927de - rustc_hir_analysis[6239ffc5e5ec24c9]::collect::resolve_bound_vars::resolve_bound_vars
  24:     0x7ae2e6192437 - rustc_query_impl[b034b92d40b1d47d]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[b034b92d40b1d47d]::query_impl::resolve_bound_vars::dynamic_query::{closure#2}::{closure#0}, rustc_middle[e321b4b4f2134162]::query::erase::Erased<[u8; 8usize]>>
  25:     0x7ae2e5c6419f - rustc_query_system[4a94863d7e85f976]::query::plumbing::try_execute_query::<rustc_query_impl[b034b92d40b1d47d]::DynamicConfig<rustc_query_system[4a94863d7e85f976]::query::caches::VecCache<rustc_hir[ca0bf1aa5980ff5d]::hir_id::OwnerId, rustc_middle[e321b4b4f2134162]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[b034b92d40b1d47d]::plumbing::QueryCtxt, false>
  26:     0x7ae2e5c63b51 - rustc_query_impl[b034b92d40b1d47d]::query_impl::resolve_bound_vars::get_query_non_incr::__rust_end_short_backtrace
  27:     0x7ae2e5c64f71 - rustc_query_impl[b034b92d40b1d47d]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[b034b92d40b1d47d]::query_impl::named_variable_map::dynamic_query::{closure#2}::{closure#0}, rustc_middle[e321b4b4f2134162]::query::erase::Erased<[u8; 8usize]>>
  28:     0x7ae2e5c6419f - rustc_query_system[4a94863d7e85f976]::query::plumbing::try_execute_query::<rustc_query_impl[b034b92d40b1d47d]::DynamicConfig<rustc_query_system[4a94863d7e85f976]::query::caches::VecCache<rustc_hir[ca0bf1aa5980ff5d]::hir_id::OwnerId, rustc_middle[e321b4b4f2134162]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[b034b92d40b1d47d]::plumbing::QueryCtxt, false>
  29:     0x7ae2e5c63c0d - rustc_query_impl[b034b92d40b1d47d]::query_impl::named_variable_map::get_query_non_incr::__rust_end_short_backtrace
  30:     0x7ae2e61a248f - <dyn rustc_hir_analysis[6239ffc5e5ec24c9]::hir_ty_lowering::HirTyLowerer>::lower_path
  31:     0x7ae2e619f8c0 - <dyn rustc_hir_analysis[6239ffc5e5ec24c9]::hir_ty_lowering::HirTyLowerer>::lower_ty_common::{closure#0}
  32:     0x7ae2e348f3c3 - rustc_hir_analysis[6239ffc5e5ec24c9]::collect::type_of::type_of
  33:     0x7ae2e5be496a - rustc_query_impl[b034b92d40b1d47d]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[b034b92d40b1d47d]::query_impl::type_of::dynamic_query::{closure#2}::{closure#0}, rustc_middle[e321b4b4f2134162]::query::erase::Erased<[u8; 8usize]>>
  34:     0x7ae2e5be3694 - rustc_query_system[4a94863d7e85f976]::query::plumbing::try_execute_query::<rustc_query_impl[b034b92d40b1d47d]::DynamicConfig<rustc_query_system[4a94863d7e85f976]::query::caches::DefIdCache<rustc_middle[e321b4b4f2134162]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[b034b92d40b1d47d]::plumbing::QueryCtxt, false>
  35:     0x7ae2e5be323b - rustc_query_impl[b034b92d40b1d47d]::query_impl::type_of::get_query_non_incr::__rust_end_short_backtrace
  36:     0x7ae2e61e1e8e - rustc_hir_analysis[6239ffc5e5ec24c9]::outlives::inferred_outlives_crate
  37:     0x7ae2e61e0f3c - rustc_query_impl[b034b92d40b1d47d]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[b034b92d40b1d47d]::query_impl::inferred_outlives_crate::dynamic_query::{closure#2}::{closure#0}, rustc_middle[e321b4b4f2134162]::query::erase::Erased<[u8; 8usize]>>
  38:     0x7ae2e684f382 - rustc_query_system[4a94863d7e85f976]::query::plumbing::try_execute_query::<rustc_query_impl[b034b92d40b1d47d]::DynamicConfig<rustc_query_system[4a94863d7e85f976]::query::caches::SingleCache<rustc_middle[e321b4b4f2134162]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[b034b92d40b1d47d]::plumbing::QueryCtxt, false>
  39:     0x7ae2e684fd38 - rustc_query_impl[b034b92d40b1d47d]::query_impl::inferred_outlives_crate::get_query_non_incr::__rust_end_short_backtrace
  40:     0x7ae2e5c36b56 - rustc_query_impl[b034b92d40b1d47d]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[b034b92d40b1d47d]::query_impl::inferred_outlives_of::dynamic_query::{closure#2}::{closure#0}, rustc_middle[e321b4b4f2134162]::query::erase::Erased<[u8; 16usize]>>
  41:     0x7ae2e5c3592f - rustc_query_system[4a94863d7e85f976]::query::plumbing::try_execute_query::<rustc_query_impl[b034b92d40b1d47d]::DynamicConfig<rustc_query_system[4a94863d7e85f976]::query::caches::DefIdCache<rustc_middle[e321b4b4f2134162]::query::erase::Erased<[u8; 16usize]>>, false, false, false>, rustc_query_impl[b034b92d40b1d47d]::plumbing::QueryCtxt, false>
  42:     0x7ae2e5c3563f - rustc_query_impl[b034b92d40b1d47d]::query_impl::inferred_outlives_of::get_query_non_incr::__rust_end_short_backtrace
  43:     0x7ae2e5c3fd9a - rustc_hir_analysis[6239ffc5e5ec24c9]::collect::predicates_defined_on
  44:     0x7ae2e5c3fbed - rustc_query_impl[b034b92d40b1d47d]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[b034b92d40b1d47d]::query_impl::predicates_defined_on::dynamic_query::{closure#2}::{closure#0}, rustc_middle[e321b4b4f2134162]::query::erase::Erased<[u8; 24usize]>>
  45:     0x7ae2e5c3fbd5 - <rustc_query_impl[b034b92d40b1d47d]::query_impl::predicates_defined_on::dynamic_query::{closure#2} as core[672c7616ff9a88f5]::ops::function::FnOnce<(rustc_middle[e321b4b4f2134162]::ty::context::TyCtxt, rustc_span[31538c27a715cd64]::def_id::DefId)>>::call_once
  46:     0x7ae2e5c3f017 - rustc_query_system[4a94863d7e85f976]::query::plumbing::try_execute_query::<rustc_query_impl[b034b92d40b1d47d]::DynamicConfig<rustc_query_system[4a94863d7e85f976]::query::caches::DefIdCache<rustc_middle[e321b4b4f2134162]::query::erase::Erased<[u8; 24usize]>>, false, false, false>, rustc_query_impl[b034b92d40b1d47d]::plumbing::QueryCtxt, false>
  47:     0x7ae2e5c3dd40 - rustc_query_impl[b034b92d40b1d47d]::query_impl::predicates_defined_on::get_query_non_incr::__rust_end_short_backtrace
  48:     0x7ae2e5c3de8e - rustc_hir_analysis[6239ffc5e5ec24c9]::collect::predicates_of::predicates_of
  49:     0x7ae2e5c3dd97 - rustc_query_impl[b034b92d40b1d47d]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[b034b92d40b1d47d]::query_impl::predicates_of::dynamic_query::{closure#2}::{closure#0}, rustc_middle[e321b4b4f2134162]::query::erase::Erased<[u8; 24usize]>>
  50:     0x7ae2e5c3f031 - rustc_query_system[4a94863d7e85f976]::query::plumbing::try_execute_query::<rustc_query_impl[b034b92d40b1d47d]::DynamicConfig<rustc_query_system[4a94863d7e85f976]::query::caches::DefIdCache<rustc_middle[e321b4b4f2134162]::query::erase::Erased<[u8; 24usize]>>, false, false, false>, rustc_query_impl[b034b92d40b1d47d]::plumbing::QueryCtxt, false>
  51:     0x7ae2e5c3eae8 - rustc_query_impl[b034b92d40b1d47d]::query_impl::predicates_of::get_query_non_incr::__rust_end_short_backtrace
  52:     0x7ae2e5bffdfc - <rustc_hir_analysis[6239ffc5e5ec24c9]::collect::CollectItemTypesVisitor as rustc_hir[ca0bf1aa5980ff5d]::intravisit::Visitor>::visit_item
  53:     0x7ae2e2b0f2ef - rustc_hir_analysis[6239ffc5e5ec24c9]::check::wfcheck::check_well_formed
  54:     0x7ae2e608c2bd - rustc_query_impl[b034b92d40b1d47d]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[b034b92d40b1d47d]::query_impl::check_well_formed::dynamic_query::{closure#2}::{closure#0}, rustc_middle[e321b4b4f2134162]::query::erase::Erased<[u8; 1usize]>>
  55:     0x7ae2e608c535 - rustc_query_system[4a94863d7e85f976]::query::plumbing::try_execute_query::<rustc_query_impl[b034b92d40b1d47d]::DynamicConfig<rustc_query_system[4a94863d7e85f976]::query::caches::VecCache<rustc_hir[ca0bf1aa5980ff5d]::hir_id::OwnerId, rustc_middle[e321b4b4f2134162]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[b034b92d40b1d47d]::plumbing::QueryCtxt, false>
  56:     0x7ae2e608c29a - rustc_query_impl[b034b92d40b1d47d]::query_impl::check_well_formed::get_query_non_incr::__rust_end_short_backtrace
  57:     0x7ae2e608cf4c - rustc_hir_analysis[6239ffc5e5ec24c9]::check::wfcheck::check_mod_type_wf
  58:     0x7ae2e608cd99 - rustc_query_impl[b034b92d40b1d47d]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[b034b92d40b1d47d]::query_impl::check_mod_type_wf::dynamic_query::{closure#2}::{closure#0}, rustc_middle[e321b4b4f2134162]::query::erase::Erased<[u8; 1usize]>>
  59:     0x7ae2e6549038 - rustc_query_system[4a94863d7e85f976]::query::plumbing::try_execute_query::<rustc_query_impl[b034b92d40b1d47d]::DynamicConfig<rustc_query_system[4a94863d7e85f976]::query::caches::DefaultCache<rustc_span[31538c27a715cd64]::def_id::LocalModDefId, rustc_middle[e321b4b4f2134162]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[b034b92d40b1d47d]::plumbing::QueryCtxt, false>
  60:     0x7ae2e6548dd9 - rustc_query_impl[b034b92d40b1d47d]::query_impl::check_mod_type_wf::get_query_non_incr::__rust_end_short_backtrace
  61:     0x7ae2e5d66e1f - rustc_hir_analysis[6239ffc5e5ec24c9]::check_crate
  62:     0x7ae2e5d5cf15 - rustc_interface[73bd107be0165211]::passes::analysis
  63:     0x7ae2e5d5cad9 - rustc_query_impl[b034b92d40b1d47d]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[b034b92d40b1d47d]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[e321b4b4f2134162]::query::erase::Erased<[u8; 1usize]>>
  64:     0x7ae2e6850825 - rustc_query_system[4a94863d7e85f976]::query::plumbing::try_execute_query::<rustc_query_impl[b034b92d40b1d47d]::DynamicConfig<rustc_query_system[4a94863d7e85f976]::query::caches::SingleCache<rustc_middle[e321b4b4f2134162]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[b034b92d40b1d47d]::plumbing::QueryCtxt, false>
  65:     0x7ae2e685058f - rustc_query_impl[b034b92d40b1d47d]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  66:     0x7ae2e6777e3f - rustc_interface[73bd107be0165211]::interface::run_compiler::<core[672c7616ff9a88f5]::result::Result<(), rustc_span[31538c27a715cd64]::ErrorGuaranteed>, rustc_driver_impl[6d6094f07793e4a9]::run_compiler::{closure#0}>::{closure#1}
  67:     0x7ae2e6637e89 - std[e6dd88f179d4d596]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[73bd107be0165211]::util::run_in_thread_with_globals<rustc_interface[73bd107be0165211]::util::run_in_thread_pool_with_globals<rustc_interface[73bd107be0165211]::interface::run_compiler<core[672c7616ff9a88f5]::result::Result<(), rustc_span[31538c27a715cd64]::ErrorGuaranteed>, rustc_driver_impl[6d6094f07793e4a9]::run_compiler::{closure#0}>::{closure#1}, core[672c7616ff9a88f5]::result::Result<(), rustc_span[31538c27a715cd64]::ErrorGuaranteed>>::{closure#0}, core[672c7616ff9a88f5]::result::Result<(), rustc_span[31538c27a715cd64]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[672c7616ff9a88f5]::result::Result<(), rustc_span[31538c27a715cd64]::ErrorGuaranteed>>
  68:     0x7ae2e6637c3a - <<std[e6dd88f179d4d596]::thread::Builder>::spawn_unchecked_<rustc_interface[73bd107be0165211]::util::run_in_thread_with_globals<rustc_interface[73bd107be0165211]::util::run_in_thread_pool_with_globals<rustc_interface[73bd107be0165211]::interface::run_compiler<core[672c7616ff9a88f5]::result::Result<(), rustc_span[31538c27a715cd64]::ErrorGuaranteed>, rustc_driver_impl[6d6094f07793e4a9]::run_compiler::{closure#0}>::{closure#1}, core[672c7616ff9a88f5]::result::Result<(), rustc_span[31538c27a715cd64]::ErrorGuaranteed>>::{closure#0}, core[672c7616ff9a88f5]::result::Result<(), rustc_span[31538c27a715cd64]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[672c7616ff9a88f5]::result::Result<(), rustc_span[31538c27a715cd64]::ErrorGuaranteed>>::{closure#2} as core[672c7616ff9a88f5]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  69:     0x7ae2e7f2a16b - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hcfcb27dcb2ebeeb7
                               at /rustc/d929a42a664c026167800801b26d734db925314f/library/alloc/src/boxed.rs:2064:9
  70:     0x7ae2e7f2a16b - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h7d3cd9c06edd61cc
                               at /rustc/d929a42a664c026167800801b26d734db925314f/library/alloc/src/boxed.rs:2064:9
  71:     0x7ae2e7f2a16b - std::sys::pal::unix::thread::Thread::new::thread_start::h082ffbd0fcdeae0d
                               at /rustc/d929a42a664c026167800801b26d734db925314f/library/std/src/sys/pal/unix/thread.rs:108:17
  72:     0x7ae2e7cbfded - <unknown>
  73:     0x7ae2e7d430dc - <unknown>
  74:                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: rustc 1.81.0-nightly (d929a42a6 2024-06-25) running on x86_64-unknown-linux-gnu

query stack during panic:
#0 [resolve_bound_vars] resolving lifetimes
#1 [named_variable_map] looking up a named region
end of query stack
error: aborting due to 3 previous errors

For more information about this error, try `rustc --explain E0658`.

The text was updated successfully, but these errors were encountered:

matthiaskrgr · 2024-06-25T20:29:48Z

mmh bisects to #115367

…s, r=wesleywiser Retire the `unnamed_fields` feature for now `#![feature(unnamed_fields)]` was implemented in part in rust-lang#115131 and rust-lang#115367, however work on that feature has (afaict) stalled and in the mean time there have been some concerns raised (e.g.[^1][^2]) about whether `unnamed_fields` is worthwhile to have in the language, especially in its current desugaring. Because it represents a compiler implementation burden including a new kind of anonymous ADT and additional complication to field selection, and is quite prone to bugs today, I'm choosing to remove the feature. However, since I'm not one to really write a bunch of words, I'm specifically *not* going to de-RFC this feature. This PR essentially *rolls back* the state of this feature to "RFC accepted but not yet implemented"; however if anyone wants to formally unapprove the RFC from the t-lang side, then please be my guest. I'm just not totally willing to summarize the various language-facing reasons for why this feature is or is not worthwhile, since I'm coming from the compiler side mostly. Fixes rust-lang#117942 Fixes rust-lang#121161 Fixes rust-lang#121263 Fixes rust-lang#121299 Fixes rust-lang#121722 Fixes rust-lang#121799 Fixes rust-lang#126969 Fixes rust-lang#131041 Tracking: * rust-lang#49804 [^1]: https://rust-lang.zulipchat.com/#narrow/stream/213817-t-lang/topic/Unnamed.20struct.2Funion.20fields [^2]: rust-lang#49804 (comment)

matthiaskrgr added I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. C-bug Category: This is a bug. labels Jun 25, 2024

rustbot added the needs-triage This issue may need triage. Remove it if it has been sufficiently triaged. label Jun 25, 2024

matthiaskrgr added the F-unnamed_fields `#![feature(unnamed_fields)]` label Jun 25, 2024

matthiaskrgr added the S-bug-has-test Status: This bug is tracked inside the repo by a `known-bug` test. label Jul 5, 2024

saethlin removed the needs-triage This issue may need triage. Remove it if it has been sufficiently triaged. label Jul 20, 2024

compiler-errors mentioned this issue Sep 30, 2024

Retire the unnamed_fields feature for now #131045

Merged

bors closed this as completed in f496659 Oct 11, 2024

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ICE: unnamed fields: `internal compiler error: could not resolve DefId` #126969

ICE: unnamed fields: `internal compiler error: could not resolve DefId` #126969

matthiaskrgr commented Jun 25, 2024

matthiaskrgr commented Jun 25, 2024

ICE: unnamed fields: internal compiler error: could not resolve DefId #126969

ICE: unnamed fields: internal compiler error: could not resolve DefId #126969

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matthiaskrgr commented Jun 25, 2024

matthiaskrgr commented Jun 25, 2024

ICE: unnamed fields: `internal compiler error: could not resolve DefId` #126969

ICE: unnamed fields: `internal compiler error: could not resolve DefId` #126969