ICE: is not an ADT

auto-reduced (treereduce-rust):

struct D {
    _: i32,
}

original:

// Test to ensure that there is no ICE when normalizing a projection
// which is invalid (from <https://github.com/rust-lang/rust/pull/106938>).

#![crate_type = "lib"]

trait Identity {
    type Identity;
}
trait NotImplemented {}

impl<T: NotImplemented> Identity for T {
    type Identity = Self;
}

type Foo = u8;

union D { //~ ERROR union with unnamed fields must have `#[repr(C)]` representation
          //~^ NOTE union `D` defined here
    _: Foo, //~ NOTE unnamed field defined here
}

Version information

rustc 1.78.0-nightly (4ae1e7987 2024-02-15)
binary: rustc
commit-hash: 4ae1e79876fcee94a56c1edf7c029a677084d7fc
commit-date: 2024-02-15
host: x86_64-unknown-linux-gnu
release: 1.78.0-nightly
LLVM version: 18.1.0

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

Program output

error[E0412]: cannot find type `Foo` in this scope
 --> /tmp/icemaker_global_tempdir.PsY4g7WJv2in/rustc_testrunner_tmpdir_reporting.BtIZwWFLl4Dp/mvce.rs:2:8
  |
2 |     _: Foo,
  |        ^^^ not found in this scope

error[E0658]: unnamed fields are not yet fully implemented
 --> /tmp/icemaker_global_tempdir.PsY4g7WJv2in/rustc_testrunner_tmpdir_reporting.BtIZwWFLl4Dp/mvce.rs:2:5
  |
2 |     _: Foo,
  |     ^
  |
  = 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  = note: this compiler was built on 2024-02-15; consider upgrading it if it is out of date

error[E0601]: `main` function not found in crate `mvce`
 --> /tmp/icemaker_global_tempdir.PsY4g7WJv2in/rustc_testrunner_tmpdir_reporting.BtIZwWFLl4Dp/mvce.rs:3:2
  |
3 | }
  |  ^ consider adding a `main` function to `/tmp/icemaker_global_tempdir.PsY4g7WJv2in/rustc_testrunner_tmpdir_reporting.BtIZwWFLl4Dp/mvce.rs`

thread 'rustc' panicked at /rustc/4ae1e79876fcee94a56c1edf7c029a677084d7fc/compiler/rustc_hir/src/def.rs:653:45:
attempted .def_id() on invalid res: Err
stack backtrace:
   0:     0x7f28d2bbee46 - std::backtrace_rs::backtrace::libunwind::trace::hcc3d90ef12e96b5c
                               at /rustc/4ae1e79876fcee94a56c1edf7c029a677084d7fc/library/std/src/../../backtrace/src/backtrace/libunwind.rs:104:5
   1:     0x7f28d2bbee46 - std::backtrace_rs::backtrace::trace_unsynchronized::h9e44c795d3a32a31
                               at /rustc/4ae1e79876fcee94a56c1edf7c029a677084d7fc/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f28d2bbee46 - std::sys_common::backtrace::_print_fmt::h06f6a85e1f7bfe6a
                               at /rustc/4ae1e79876fcee94a56c1edf7c029a677084d7fc/library/std/src/sys_common/backtrace.rs:68:5
   3:     0x7f28d2bbee46 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h3a0e4a97abc24368
                               at /rustc/4ae1e79876fcee94a56c1edf7c029a677084d7fc/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f28d2c0f46c - core::fmt::rt::Argument::fmt::hf9d66c2ae68e512f
                               at /rustc/4ae1e79876fcee94a56c1edf7c029a677084d7fc/library/core/src/fmt/rt.rs:142:9
   5:     0x7f28d2c0f46c - core::fmt::write::h255428336c5c4d68
                               at /rustc/4ae1e79876fcee94a56c1edf7c029a677084d7fc/library/core/src/fmt/mod.rs:1120:17
   6:     0x7f28d2bb27ef - std::io::Write::write_fmt::h8df21bf872710cca
                               at /rustc/4ae1e79876fcee94a56c1edf7c029a677084d7fc/library/std/src/io/mod.rs:1854:15
   7:     0x7f28d2bbebf4 - std::sys_common::backtrace::_print::hdba8a076d62b5a13
                               at /rustc/4ae1e79876fcee94a56c1edf7c029a677084d7fc/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7f28d2bbebf4 - std::sys_common::backtrace::print::h3796ba41287d5e8f
                               at /rustc/4ae1e79876fcee94a56c1edf7c029a677084d7fc/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7f28d2bc193b - std::panicking::default_hook::{{closure}}::hf33809fe69ce2a32
  10:     0x7f28d2bc1689 - std::panicking::default_hook::h2139224d4049251f
                               at /rustc/4ae1e79876fcee94a56c1edf7c029a677084d7fc/library/std/src/panicking.rs:292:9
  11:     0x7f28cf9f3dec - std[8987fc0b08a76998]::panicking::update_hook::<alloc[7b677b30fb9d50db]::boxed::Box<rustc_driver_impl[cba9acd42ce093f7]::install_ice_hook::{closure#0}>>::{closure#0}
  12:     0x7f28d2bc20a0 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::he963d7bf45d9f2f8
                               at /rustc/4ae1e79876fcee94a56c1edf7c029a677084d7fc/library/alloc/src/boxed.rs:2030:9
  13:     0x7f28d2bc20a0 - std::panicking::rust_panic_with_hook::hed73a13dc766f57e
                               at /rustc/4ae1e79876fcee94a56c1edf7c029a677084d7fc/library/std/src/panicking.rs:785:13
  14:     0x7f28d2bc1de2 - std::panicking::begin_panic_handler::{{closure}}::hfee7e5c160ef18d6
                               at /rustc/4ae1e79876fcee94a56c1edf7c029a677084d7fc/library/std/src/panicking.rs:659:13
  15:     0x7f28d2bbf326 - std::sys_common::backtrace::__rust_end_short_backtrace::h99608b782830294c
                               at /rustc/4ae1e79876fcee94a56c1edf7c029a677084d7fc/library/std/src/sys_common/backtrace.rs:171:18
  16:     0x7f28d2bc1b14 - rust_begin_unwind
                               at /rustc/4ae1e79876fcee94a56c1edf7c029a677084d7fc/library/std/src/panicking.rs:647:5
  17:     0x7f28d2c0b975 - core::panicking::panic_fmt::hd77d60d7e0b5325a
                               at /rustc/4ae1e79876fcee94a56c1edf7c029a677084d7fc/library/core/src/panicking.rs:72:14
  18:     0x7f28cfad5183 - <rustc_hir[e2f191fafc321d5f]::def::Res>::def_id
  19:     0x7f28d2131ce1 - <rustc_hir_analysis[47139fb5b7dde87e]::collect::FieldUniquenessCheckContext>::check_field.cold.0
  20:     0x7f28d15cc9fc - rustc_hir_analysis[47139fb5b7dde87e]::collect::convert_variant
  21:     0x7f28d15cc319 - rustc_hir_analysis[47139fb5b7dde87e]::collect::adt_def
  22:     0x7f28d0c90915 - rustc_query_impl[473ff90346133de9]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[473ff90346133de9]::query_impl::adt_def::dynamic_query::{closure#2}::{closure#0}, rustc_middle[a3fb61e483312760]::query::erase::Erased<[u8; 8usize]>>
  23:     0x7f28d0c90fe0 - rustc_query_system[583d5dc4e07867b4]::query::plumbing::try_execute_query::<rustc_query_impl[473ff90346133de9]::DynamicConfig<rustc_query_system[583d5dc4e07867b4]::query::caches::DefIdCache<rustc_middle[a3fb61e483312760]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[473ff90346133de9]::plumbing::QueryCtxt, false>
  24:     0x7f28d0c902de - rustc_query_impl[473ff90346133de9]::query_impl::adt_def::get_query_non_incr::__rust_end_short_backtrace
  25:     0x7f28d0e5f192 - rustc_middle[a3fb61e483312760]::query::plumbing::query_get_at::<rustc_query_system[583d5dc4e07867b4]::query::caches::DefIdCache<rustc_middle[a3fb61e483312760]::query::erase::Erased<[u8; 8usize]>>>
  26:     0x7f28ceff9869 - rustc_hir_analysis[47139fb5b7dde87e]::collect::type_of::type_of
  27:     0x7f28d0c9233a - rustc_query_impl[473ff90346133de9]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[473ff90346133de9]::query_impl::type_of::dynamic_query::{closure#2}::{closure#0}, rustc_middle[a3fb61e483312760]::query::erase::Erased<[u8; 8usize]>>
  28:     0x7f28d0c90fe0 - rustc_query_system[583d5dc4e07867b4]::query::plumbing::try_execute_query::<rustc_query_impl[473ff90346133de9]::DynamicConfig<rustc_query_system[583d5dc4e07867b4]::query::caches::DefIdCache<rustc_middle[a3fb61e483312760]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[473ff90346133de9]::plumbing::QueryCtxt, false>
  29:     0x7f28d0c90add - rustc_query_impl[473ff90346133de9]::query_impl::type_of::get_query_non_incr::__rust_end_short_backtrace
  30:     0x7f28d0fe79e3 - <rustc_hir_analysis[47139fb5b7dde87e]::collect::CollectItemTypesVisitor as rustc_hir[e2f191fafc321d5f]::intravisit::Visitor>::visit_item
  31:     0x7f28d0fe69f6 - rustc_hir_analysis[47139fb5b7dde87e]::collect::collect_mod_item_types
  32:     0x7f28d0fe6989 - rustc_query_impl[473ff90346133de9]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[473ff90346133de9]::query_impl::collect_mod_item_types::dynamic_query::{closure#2}::{closure#0}, rustc_middle[a3fb61e483312760]::query::erase::Erased<[u8; 0usize]>>
  33:     0x7f28d1889c6d - rustc_query_system[583d5dc4e07867b4]::query::plumbing::try_execute_query::<rustc_query_impl[473ff90346133de9]::DynamicConfig<rustc_query_system[583d5dc4e07867b4]::query::caches::DefaultCache<rustc_span[2b05593b68d237f9]::def_id::LocalModDefId, rustc_middle[a3fb61e483312760]::query::erase::Erased<[u8; 0usize]>>, false, false, false>, rustc_query_impl[473ff90346133de9]::plumbing::QueryCtxt, false>
  34:     0x7f28d1889797 - rustc_query_impl[473ff90346133de9]::query_impl::collect_mod_item_types::get_query_non_incr::__rust_end_short_backtrace
  35:     0x7f28d0d88528 - rustc_hir_analysis[47139fb5b7dde87e]::check_crate
  36:     0x7f28d1622093 - rustc_interface[f5e508595022ee61]::passes::analysis
  37:     0x7f28d1621ce9 - rustc_query_impl[473ff90346133de9]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[473ff90346133de9]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[a3fb61e483312760]::query::erase::Erased<[u8; 1usize]>>
  38:     0x7f28d1bb6fe5 - rustc_query_system[583d5dc4e07867b4]::query::plumbing::try_execute_query::<rustc_query_impl[473ff90346133de9]::DynamicConfig<rustc_query_system[583d5dc4e07867b4]::query::caches::SingleCache<rustc_middle[a3fb61e483312760]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[473ff90346133de9]::plumbing::QueryCtxt, false>
  39:     0x7f28d1bb6d49 - rustc_query_impl[473ff90346133de9]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  40:     0x7f28d1a45fd5 - rustc_interface[f5e508595022ee61]::interface::run_compiler::<core[2325a369051f62f2]::result::Result<(), rustc_span[2b05593b68d237f9]::ErrorGuaranteed>, rustc_driver_impl[cba9acd42ce093f7]::run_compiler::{closure#0}>::{closure#0}
  41:     0x7f28d1bceb98 - std[8987fc0b08a76998]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[f5e508595022ee61]::util::run_in_thread_with_globals<rustc_interface[f5e508595022ee61]::util::run_in_thread_pool_with_globals<rustc_interface[f5e508595022ee61]::interface::run_compiler<core[2325a369051f62f2]::result::Result<(), rustc_span[2b05593b68d237f9]::ErrorGuaranteed>, rustc_driver_impl[cba9acd42ce093f7]::run_compiler::{closure#0}>::{closure#0}, core[2325a369051f62f2]::result::Result<(), rustc_span[2b05593b68d237f9]::ErrorGuaranteed>>::{closure#0}, core[2325a369051f62f2]::result::Result<(), rustc_span[2b05593b68d237f9]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[2325a369051f62f2]::result::Result<(), rustc_span[2b05593b68d237f9]::ErrorGuaranteed>>
  42:     0x7f28d1bce9c4 - <<std[8987fc0b08a76998]::thread::Builder>::spawn_unchecked_<rustc_interface[f5e508595022ee61]::util::run_in_thread_with_globals<rustc_interface[f5e508595022ee61]::util::run_in_thread_pool_with_globals<rustc_interface[f5e508595022ee61]::interface::run_compiler<core[2325a369051f62f2]::result::Result<(), rustc_span[2b05593b68d237f9]::ErrorGuaranteed>, rustc_driver_impl[cba9acd42ce093f7]::run_compiler::{closure#0}>::{closure#0}, core[2325a369051f62f2]::result::Result<(), rustc_span[2b05593b68d237f9]::ErrorGuaranteed>>::{closure#0}, core[2325a369051f62f2]::result::Result<(), rustc_span[2b05593b68d237f9]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[2325a369051f62f2]::result::Result<(), rustc_span[2b05593b68d237f9]::ErrorGuaranteed>>::{closure#1} as core[2325a369051f62f2]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  43:     0x7f28d2bcb1e5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hba395c219cfd5449
                               at /rustc/4ae1e79876fcee94a56c1edf7c029a677084d7fc/library/alloc/src/boxed.rs:2016:9
  44:     0x7f28d2bcb1e5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h0c162d42937122ed
                               at /rustc/4ae1e79876fcee94a56c1edf7c029a677084d7fc/library/alloc/src/boxed.rs:2016:9
  45:     0x7f28d2bcb1e5 - std::sys::pal::unix::thread::Thread::new::thread_start::ha2ad7390a99d7476
                               at /rustc/4ae1e79876fcee94a56c1edf7c029a677084d7fc/library/std/src/sys/pal/unix/thread.rs:108:17
  46:     0x7f28cca749eb - <unknown>
  47:     0x7f28ccaf87cc - <unknown>
  48:                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 1.78.0-nightly (4ae1e7987 2024-02-15) running on x86_64-unknown-linux-gnu

query stack during panic:
#0 [adt_def] computing ADT definition for `D`
#1 [type_of] computing type of `D`
#2 [collect_mod_item_types] collecting item types in top-level module
#3 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 3 previous errors

Some errors have detailed explanations: E0412, E0601, E0658.
For more information about an error, try `rustc --explain E0412`.

@frank-king

Actually nvm, don't want to work on this.

@frank-king: heads up that this code is broken. It does not verify that the unnamed field is an ADT:

#![feature(unnamed_fields)]

#[repr(C)]
struct D {
    _: i32,
}

fn main() {}

Rollup merge of rust-lang#121198 - clubby789:unnamed-fields-hir-check…

Unrolled build for rust-lang#121198

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ICE: `is not an ADT` #121151

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ICE: is not an ADT #121151

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compiler-errors commented on Feb 15, 2024

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ICE: `is not an ADT` #121151