ICE: tcx.dcx().has_errors().is_some()

[matthiaskrgr]

auto-reduced (treereduce-rust):

pub type Archived<T> = <m::Alias as m::Trait>::Archived;

fn main() {}

original:

// check-pass
pub trait Archive {
    type Archived;
}

impl<T> Archive for Option<T> {
    type Archived = ();
}
pub type Archived<T> = <m::Alias as m::Trait>::Archived;

pub trait Deserialize<D> {}

const ARRAY_SIZE: usize = 32;
impl<__D> Deserialize<__D> for ()
where
    Option<[u8; ARRAY_SIZE]>: Archive,
    Archived<Option<[u8; ARRAY_SIZE]>>: Deserialize<__D>,
{
}
fn main() {}

Version information

rustc 1.78.0-nightly (e28fae52d 2024-02-09)
binary: rustc
commit-hash: e28fae52d99d7c14bf0890d1f2b13c2c34fa8932
commit-date: 2024-02-09
host: x86_64-unknown-linux-gnu
release: 1.78.0-nightly
LLVM version: 17.0.6

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

Program output

thread 'rustc' panicked at compiler/rustc_hir_analysis/src/check/check.rs:1286:9:
assertion failed: tcx.dcx().has_errors().is_some()
stack backtrace:
   0:     0x7f8af1f8b946 - std::backtrace_rs::backtrace::libunwind::trace::h3b9c271bc5ab1a54
                               at /rustc/e28fae52d99d7c14bf0890d1f2b13c2c34fa8932/library/std/src/../../backtrace/src/backtrace/libunwind.rs:104:5
   1:     0x7f8af1f8b946 - std::backtrace_rs::backtrace::trace_unsynchronized::h744a131fea5a9ee1
                               at /rustc/e28fae52d99d7c14bf0890d1f2b13c2c34fa8932/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f8af1f8b946 - std::sys_common::backtrace::_print_fmt::hab520e9f265cb2b8
                               at /rustc/e28fae52d99d7c14bf0890d1f2b13c2c34fa8932/library/std/src/sys_common/backtrace.rs:68:5
   3:     0x7f8af1f8b946 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h406018ae35c10d47
                               at /rustc/e28fae52d99d7c14bf0890d1f2b13c2c34fa8932/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f8af1fde390 - core::fmt::rt::Argument::fmt::h19bd13b7b7a31f56
                               at /rustc/e28fae52d99d7c14bf0890d1f2b13c2c34fa8932/library/core/src/fmt/rt.rs:142:9
   5:     0x7f8af1fde390 - core::fmt::write::hfa2369b325b01363
                               at /rustc/e28fae52d99d7c14bf0890d1f2b13c2c34fa8932/library/core/src/fmt/mod.rs:1120:17
   6:     0x7f8af1f7f0ff - std::io::Write::write_fmt::h67530c983e72b96c
                               at /rustc/e28fae52d99d7c14bf0890d1f2b13c2c34fa8932/library/std/src/io/mod.rs:1854:15
   7:     0x7f8af1f8b724 - std::sys_common::backtrace::_print::h9ff1a94f5fed850e
                               at /rustc/e28fae52d99d7c14bf0890d1f2b13c2c34fa8932/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7f8af1f8b724 - std::sys_common::backtrace::print::h6b4245831c2c8d7f
                               at /rustc/e28fae52d99d7c14bf0890d1f2b13c2c34fa8932/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7f8af1f8e4e7 - std::panicking::default_hook::{{closure}}::h8b807c1c5e3ff489
  10:     0x7f8af1f8e249 - std::panicking::default_hook::h8873717ebd78f990
                               at /rustc/e28fae52d99d7c14bf0890d1f2b13c2c34fa8932/library/std/src/panicking.rs:292:9
  11:     0x7f8af4d24a9c - std[1c696104f3dc63d8]::panicking::update_hook::<alloc[f36b9cea45f2e3ed]::boxed::Box<rustc_driver_impl[7b91d97827f0c7e7]::install_ice_hook::{closure#0}>>::{closure#0}
  12:     0x7f8af1f8ec36 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h0241e27eca2b18b8
                               at /rustc/e28fae52d99d7c14bf0890d1f2b13c2c34fa8932/library/alloc/src/boxed.rs:2029:9
  13:     0x7f8af1f8ec36 - std::panicking::rust_panic_with_hook::h07fb22e64b8ea80e
                               at /rustc/e28fae52d99d7c14bf0890d1f2b13c2c34fa8932/library/std/src/panicking.rs:785:13
  14:     0x7f8af1f8e949 - std::panicking::begin_panic_handler::{{closure}}::h768da4bdbb4e0e1a
                               at /rustc/e28fae52d99d7c14bf0890d1f2b13c2c34fa8932/library/std/src/panicking.rs:651:13
  15:     0x7f8af1f8be46 - std::sys_common::backtrace::__rust_end_short_backtrace::h1f47919693562f6d
                               at /rustc/e28fae52d99d7c14bf0890d1f2b13c2c34fa8932/library/std/src/sys_common/backtrace.rs:171:18
  16:     0x7f8af1f8e6d4 - rust_begin_unwind
                               at /rustc/e28fae52d99d7c14bf0890d1f2b13c2c34fa8932/library/std/src/panicking.rs:647:5
  17:     0x7f8af1fdaa95 - core::panicking::panic_fmt::h2dd384aef7c4d342
                               at /rustc/e28fae52d99d7c14bf0890d1f2b13c2c34fa8932/library/core/src/panicking.rs:72:14
  18:     0x7f8af1fdab53 - core::panicking::panic::hae85c1382aee5373
                               at /rustc/e28fae52d99d7c14bf0890d1f2b13c2c34fa8932/library/core/src/panicking.rs:144:5
  19:     0x7f8af6aeae22 - rustc_hir_analysis[fba8a298c073d009]::check::check::check_item_type
  20:     0x7f8af678700c - rustc_hir_analysis[fba8a298c073d009]::check::wfcheck::check_well_formed
  21:     0x7f8af6785eb3 - rustc_query_impl[2a165ebfbc09ec32]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[2a165ebfbc09ec32]::query_impl::check_well_formed::dynamic_query::{closure#2}::{closure#0}, rustc_middle[23a1a4edc08e7149]::query::erase::Erased<[u8; 1usize]>>
  22:     0x7f8af678558b - rustc_query_system[fda1309255d9b241]::query::plumbing::try_execute_query::<rustc_query_impl[2a165ebfbc09ec32]::DynamicConfig<rustc_query_system[fda1309255d9b241]::query::caches::VecCache<rustc_hir[982436f6f5c06abf]::hir_id::OwnerId, rustc_middle[23a1a4edc08e7149]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[2a165ebfbc09ec32]::plumbing::QueryCtxt, false>
  23:     0x7f8af6785303 - rustc_query_impl[2a165ebfbc09ec32]::query_impl::check_well_formed::get_query_non_incr::__rust_end_short_backtrace
  24:     0x7f8af6783098 - rustc_hir_analysis[fba8a298c073d009]::check::wfcheck::check_mod_type_wf
  25:     0x7f8af6782fc9 - rustc_query_impl[2a165ebfbc09ec32]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[2a165ebfbc09ec32]::query_impl::check_mod_type_wf::dynamic_query::{closure#2}::{closure#0}, rustc_middle[23a1a4edc08e7149]::query::erase::Erased<[u8; 1usize]>>
  26:     0x7f8af696cdbb - rustc_query_system[fda1309255d9b241]::query::plumbing::try_execute_query::<rustc_query_impl[2a165ebfbc09ec32]::DynamicConfig<rustc_query_system[fda1309255d9b241]::query::caches::DefaultCache<rustc_span[bdca0d1afb713e81]::def_id::LocalModDefId, rustc_middle[23a1a4edc08e7149]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[2a165ebfbc09ec32]::plumbing::QueryCtxt, false>
  27:     0x7f8af696cac3 - rustc_query_impl[2a165ebfbc09ec32]::query_impl::check_mod_type_wf::get_query_non_incr::__rust_end_short_backtrace
  28:     0x7f8af617f059 - rustc_middle[23a1a4edc08e7149]::query::plumbing::query_ensure_error_guaranteed::<rustc_query_system[fda1309255d9b241]::query::caches::DefaultCache<rustc_span[bdca0d1afb713e81]::def_id::LocalModDefId, rustc_middle[23a1a4edc08e7149]::query::erase::Erased<[u8; 1usize]>>, ()>
  29:     0x7f8af617f8d6 - rustc_hir_analysis[fba8a298c073d009]::check_crate
  30:     0x7f8af6a4e752 - rustc_interface[4b2caed72d93bbfa]::passes::analysis
  31:     0x7f8af6a4e39f - rustc_query_impl[2a165ebfbc09ec32]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[2a165ebfbc09ec32]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[23a1a4edc08e7149]::query::erase::Erased<[u8; 1usize]>>
  32:     0x7f8af6d12ea4 - rustc_query_system[fda1309255d9b241]::query::plumbing::try_execute_query::<rustc_query_impl[2a165ebfbc09ec32]::DynamicConfig<rustc_query_system[fda1309255d9b241]::query::caches::SingleCache<rustc_middle[23a1a4edc08e7149]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[2a165ebfbc09ec32]::plumbing::QueryCtxt, false>
  33:     0x7f8af6d12c07 - rustc_query_impl[2a165ebfbc09ec32]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  34:     0x7f8af6d21c82 - rustc_interface[4b2caed72d93bbfa]::interface::run_compiler::<core[4ce96bca115a8104]::result::Result<(), rustc_span[bdca0d1afb713e81]::ErrorGuaranteed>, rustc_driver_impl[7b91d97827f0c7e7]::run_compiler::{closure#0}>::{closure#0}
  35:     0x7f8af6dd1fc6 - std[1c696104f3dc63d8]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[4b2caed72d93bbfa]::util::run_in_thread_with_globals<rustc_interface[4b2caed72d93bbfa]::util::run_in_thread_pool_with_globals<rustc_interface[4b2caed72d93bbfa]::interface::run_compiler<core[4ce96bca115a8104]::result::Result<(), rustc_span[bdca0d1afb713e81]::ErrorGuaranteed>, rustc_driver_impl[7b91d97827f0c7e7]::run_compiler::{closure#0}>::{closure#0}, core[4ce96bca115a8104]::result::Result<(), rustc_span[bdca0d1afb713e81]::ErrorGuaranteed>>::{closure#0}, core[4ce96bca115a8104]::result::Result<(), rustc_span[bdca0d1afb713e81]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[4ce96bca115a8104]::result::Result<(), rustc_span[bdca0d1afb713e81]::ErrorGuaranteed>>
  36:     0x7f8af6dd1df3 - <<std[1c696104f3dc63d8]::thread::Builder>::spawn_unchecked_<rustc_interface[4b2caed72d93bbfa]::util::run_in_thread_with_globals<rustc_interface[4b2caed72d93bbfa]::util::run_in_thread_pool_with_globals<rustc_interface[4b2caed72d93bbfa]::interface::run_compiler<core[4ce96bca115a8104]::result::Result<(), rustc_span[bdca0d1afb713e81]::ErrorGuaranteed>, rustc_driver_impl[7b91d97827f0c7e7]::run_compiler::{closure#0}>::{closure#0}, core[4ce96bca115a8104]::result::Result<(), rustc_span[bdca0d1afb713e81]::ErrorGuaranteed>>::{closure#0}, core[4ce96bca115a8104]::result::Result<(), rustc_span[bdca0d1afb713e81]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[4ce96bca115a8104]::result::Result<(), rustc_span[bdca0d1afb713e81]::ErrorGuaranteed>>::{closure#1} as core[4ce96bca115a8104]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  37:     0x7f8af1f982d5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hb800e73bb2952867
                               at /rustc/e28fae52d99d7c14bf0890d1f2b13c2c34fa8932/library/alloc/src/boxed.rs:2015:9
  38:     0x7f8af1f982d5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h8d73198cd42ba80a
                               at /rustc/e28fae52d99d7c14bf0890d1f2b13c2c34fa8932/library/alloc/src/boxed.rs:2015:9
  39:     0x7f8af1f982d5 - std::sys::pal::unix::thread::Thread::new::thread_start::h6e0317b32ca28b1a
                               at /rustc/e28fae52d99d7c14bf0890d1f2b13c2c34fa8932/library/std/src/sys/pal/unix/thread.rs:108:17
  40:     0x7f8af1d819eb - <unknown>
  41:     0x7f8af1e057cc - <unknown>
  42:                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 (e28fae52d 2024-02-09) running on x86_64-unknown-linux-gnu

query stack during panic:
#0 [check_well_formed] checking that `Archived` is well-formed
#1 [check_mod_type_wf] checking that types are well-formed in top-level module
#2 [analysis] running analysis passes on this crate
end of query stack
error[E0433]: failed to resolve: use of undeclared crate or module `m`
 --> /tmp/icemaker_global_tempdir.z9KqoWtXvAYj/rustc_testrunner_tmpdir_reporting.xigk6F76Z2fl/mvce.rs:1:37
  |
1 | pub type Archived<T> = <m::Alias as m::Trait>::Archived;
  |                                     ^
  |                                     |
  |                                     use of undeclared crate or module `m`
  |                                     help: a type parameter with a similar name exists: `T`

error[E0433]: failed to resolve: use of undeclared crate or module `m`
 --> /tmp/icemaker_global_tempdir.z9KqoWtXvAYj/rustc_testrunner_tmpdir_reporting.xigk6F76Z2fl/mvce.rs:1:25
  |
1 | pub type Archived<T> = <m::Alias as m::Trait>::Archived;
  |                         ^
  |                         |
  |                         use of undeclared crate or module `m`
  |                         help: a type parameter with a similar name exists: `T`

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0433`.

[matthiaskrgr]

#120828 cc @nnethercote

[matthiaskrgr]

in #120482 'ish ICEs, I am seeing internal compiler error: some stashed error is waiting for use' ice now, im wondering if that also relates to #120828 somehow 🤔

[nnethercote]

im wondering if that also relates to #120828 somehow 🤔

Quite likely, I'll take a look.

[nnethercote]

I can reproduce this. It's Saturday morning here, I might get to it today, if not I'll look on Monday morning.

[nnethercote]

Fixing this is really easy, I just need to adjust the assertion a tiny bit.

The hard part is deciding where to put the test. tests/ui/issues/ is the obvious place, but then I get tidy complaining that there are too many files in that directory. Suggestions?

[matthiaskrgr]

just bump the limit by one like everybody else? 🙃 🙈

[nnethercote]

I ended up putting the test in tests/ui/typeck/, because it happens during type checking.