ICE: `lazy_type_alias` None in compiler/rustc_hir_analysis/src/astconv/mod.rs

[matthiaskrgr]

Code

rustc ./68684-2.rs

#![feature(lazy_type_alias)]
enum _Enum {
    A(),
}

type _E = _Enum;

const fn _a() -> _Enum {
    _E::A()
}

const _A: _Enum = _a();

fn main() {}

Meta

rustc --version --verbose:

rustc 1.73.0-nightly (ad963232d 2023-07-14)
binary: rustc
commit-hash: ad963232d9b987d66a6f8e6ec4141f672b8b9900
commit-date: 2023-07-14
host: x86_64-unknown-linux-gnu
release: 1.73.0-nightly
LLVM version: 16.0.5

Error output

<output>

Backtrace

thread 'rustc' panicked at 'called `Option::unwrap()` on a `None` value', compiler/rustc_hir_analysis/src/astconv/mod.rs:2080:65
stack backtrace:
   0:     0x7fbedeb63431 - std::backtrace_rs::backtrace::libunwind::trace::hbe1beb7d621d58fa
                               at /rustc/ad963232d9b987d66a6f8e6ec4141f672b8b9900/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7fbedeb63431 - std::backtrace_rs::backtrace::trace_unsynchronized::he8e3e2c387ab6872
                               at /rustc/ad963232d9b987d66a6f8e6ec4141f672b8b9900/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7fbedeb63431 - std::sys_common::backtrace::_print_fmt::h6dbdf2be39b8270c
                               at /rustc/ad963232d9b987d66a6f8e6ec4141f672b8b9900/library/std/src/sys_common/backtrace.rs:65:5
   3:     0x7fbedeb63431 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h3cbca66214d4a04c
                               at /rustc/ad963232d9b987d66a6f8e6ec4141f672b8b9900/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7fbedebc953f - core::fmt::rt::Argument::fmt::hf61be5530d19e8de
                               at /rustc/ad963232d9b987d66a6f8e6ec4141f672b8b9900/library/core/src/fmt/rt.rs:138:9
   5:     0x7fbedebc953f - core::fmt::write::h1241e990bb935116
                               at /rustc/ad963232d9b987d66a6f8e6ec4141f672b8b9900/library/core/src/fmt/mod.rs:1094:21
   6:     0x7fbedeb55dd7 - std::io::Write::write_fmt::h5ee2493dc0c3d50b
                               at /rustc/ad963232d9b987d66a6f8e6ec4141f672b8b9900/library/std/src/io/mod.rs:1714:15
   7:     0x7fbedeb63245 - std::sys_common::backtrace::_print::h3b1cb0d72bcf0b57
                               at /rustc/ad963232d9b987d66a6f8e6ec4141f672b8b9900/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7fbedeb63245 - std::sys_common::backtrace::print::h215071bf58f4d692
                               at /rustc/ad963232d9b987d66a6f8e6ec4141f672b8b9900/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7fbedeb66023 - std::panicking::default_hook::{{closure}}::h420f57ae0dc930a1
                               at /rustc/ad963232d9b987d66a6f8e6ec4141f672b8b9900/library/std/src/panicking.rs:269:22
  10:     0x7fbedeb65db4 - std::panicking::default_hook::hef46dbbaf7939018
                               at /rustc/ad963232d9b987d66a6f8e6ec4141f672b8b9900/library/std/src/panicking.rs:288:9
  11:     0x7fbee1de3c7b - rustc_driver_impl[356fd39593eb27dc]::install_ice_hook::{closure#0}
  12:     0x7fbedeb6684e - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::hdbc20659aa97e72b
                               at /rustc/ad963232d9b987d66a6f8e6ec4141f672b8b9900/library/alloc/src/boxed.rs:2021:9
  13:     0x7fbedeb6684e - std::panicking::rust_panic_with_hook::h38737fd0d1a1b251
                               at /rustc/ad963232d9b987d66a6f8e6ec4141f672b8b9900/library/std/src/panicking.rs:709:13
  14:     0x7fbedeb66591 - std::panicking::begin_panic_handler::{{closure}}::h2774d6ddad1e3ca4
                               at /rustc/ad963232d9b987d66a6f8e6ec4141f672b8b9900/library/std/src/panicking.rs:595:13
  15:     0x7fbedeb63896 - std::sys_common::backtrace::__rust_end_short_backtrace::h5a8afe9240c1b747
                               at /rustc/ad963232d9b987d66a6f8e6ec4141f672b8b9900/library/std/src/sys_common/backtrace.rs:151:18
  16:     0x7fbedeb66322 - rust_begin_unwind
                               at /rustc/ad963232d9b987d66a6f8e6ec4141f672b8b9900/library/std/src/panicking.rs:593:5
  17:     0x7fbedebc5793 - core::panicking::panic_fmt::h4b1ce193065cd564
                               at /rustc/ad963232d9b987d66a6f8e6ec4141f672b8b9900/library/core/src/panicking.rs:67:14
  18:     0x7fbedebc5823 - core::panicking::panic::ha1afc78c48eb006b
                               at /rustc/ad963232d9b987d66a6f8e6ec4141f672b8b9900/library/core/src/panicking.rs:117:5
  19:     0x7fbedffb9c5e - <rustc_hir_typeck[a55f57d54ad1925]::fn_ctxt::FnCtxt>::check_expr_path
  20:     0x7fbedffd9dc7 - <rustc_hir_typeck[a55f57d54ad1925]::fn_ctxt::FnCtxt>::check_call
  21:     0x7fbedff96bd7 - <rustc_hir_typeck[a55f57d54ad1925]::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
  22:     0x7fbedffd3c7e - <rustc_hir_typeck[a55f57d54ad1925]::fn_ctxt::FnCtxt>::check_block_with_expected
  23:     0x7fbedff97aed - <rustc_hir_typeck[a55f57d54ad1925]::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
  24:     0x7fbee086b686 - <rustc_hir_typeck[a55f57d54ad1925]::fn_ctxt::FnCtxt>::check_return_expr
  25:     0x7fbee086351f - rustc_hir_typeck[a55f57d54ad1925]::check::check_fn
  26:     0x7fbee0848f7a - rustc_hir_typeck[a55f57d54ad1925]::typeck
  27:     0x7fbedfe716be - rustc_query_impl[4108151966842242]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[4108151966842242]::query_impl::typeck::dynamic_query::{closure#2}::{closure#0}, rustc_middle[c95a74456656fb43]::query::erase::Erased<[u8; 8usize]>>
  28:     0x7fbedfe7168e - <rustc_query_impl[4108151966842242]::query_impl::typeck::dynamic_query::{closure#2} as core[82b97d3770534f31]::ops::function::FnOnce<(rustc_middle[c95a74456656fb43]::ty::context::TyCtxt, rustc_span[46061d449caa818]::def_id::LocalDefId)>>::call_once
  29:     0x7fbedff435ed - rustc_query_system[3ad0edb17e4d3225]::query::plumbing::try_execute_query::<rustc_query_impl[4108151966842242]::DynamicConfig<rustc_query_system[3ad0edb17e4d3225]::query::caches::VecCache<rustc_span[46061d449caa818]::def_id::LocalDefId, rustc_middle[c95a74456656fb43]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[4108151966842242]::plumbing::QueryCtxt, false>
  30:     0x7fbee173311f - rustc_query_impl[4108151966842242]::query_impl::typeck::get_query_non_incr::__rust_end_short_backtrace
  31:     0x7fbee12d5d3d - rustc_data_structures[f2597d3276b53841]::sync::par_for_each_in::<&[rustc_span[46061d449caa818]::def_id::LocalDefId], <rustc_middle[c95a74456656fb43]::hir::map::Map>::par_body_owners<rustc_hir_analysis[aaa7008e68a74dd7]::check_crate::{closure#7}>::{closure#0}>
  32:     0x7fbee12d4066 - rustc_hir_analysis[aaa7008e68a74dd7]::check_crate
  33:     0x7fbee12ca5da - rustc_interface[cbaee814aa2dcfe5]::passes::analysis
  34:     0x7fbee125e35a - rustc_query_impl[4108151966842242]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[4108151966842242]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[c95a74456656fb43]::query::erase::Erased<[u8; 1usize]>>
  35:     0x7fbee125e349 - <rustc_query_impl[4108151966842242]::query_impl::analysis::dynamic_query::{closure#2} as core[82b97d3770534f31]::ops::function::FnOnce<(rustc_middle[c95a74456656fb43]::ty::context::TyCtxt, ())>>::call_once
  36:     0x7fbee1443c78 - rustc_query_system[3ad0edb17e4d3225]::query::plumbing::try_execute_query::<rustc_query_impl[4108151966842242]::DynamicConfig<rustc_query_system[3ad0edb17e4d3225]::query::caches::SingleCache<rustc_middle[c95a74456656fb43]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[4108151966842242]::plumbing::QueryCtxt, false>
  37:     0x7fbee1443a57 - rustc_query_impl[4108151966842242]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  38:     0x7fbee1034675 - <rustc_middle[c95a74456656fb43]::ty::context::GlobalCtxt>::enter::<rustc_driver_impl[356fd39593eb27dc]::run_compiler::{closure#1}::{closure#2}::{closure#4}, core[82b97d3770534f31]::result::Result<(), rustc_span[46061d449caa818]::ErrorGuaranteed>>
  39:     0x7fbee1033ca2 - <rustc_interface[cbaee814aa2dcfe5]::interface::Compiler>::enter::<rustc_driver_impl[356fd39593eb27dc]::run_compiler::{closure#1}::{closure#2}, core[82b97d3770534f31]::result::Result<core[82b97d3770534f31]::option::Option<rustc_interface[cbaee814aa2dcfe5]::queries::Linker>, rustc_span[46061d449caa818]::ErrorGuaranteed>>
  40:     0x7fbee102cf75 - rustc_span[46061d449caa818]::set_source_map::<core[82b97d3770534f31]::result::Result<(), rustc_span[46061d449caa818]::ErrorGuaranteed>, rustc_interface[cbaee814aa2dcfe5]::interface::run_compiler<core[82b97d3770534f31]::result::Result<(), rustc_span[46061d449caa818]::ErrorGuaranteed>, rustc_driver_impl[356fd39593eb27dc]::run_compiler::{closure#1}>::{closure#0}::{closure#0}>
  41:     0x7fbee102c9e6 - <scoped_tls[3c9df00b6c3e8015]::ScopedKey<rustc_span[46061d449caa818]::SessionGlobals>>::set::<rustc_interface[cbaee814aa2dcfe5]::interface::run_compiler<core[82b97d3770534f31]::result::Result<(), rustc_span[46061d449caa818]::ErrorGuaranteed>, rustc_driver_impl[356fd39593eb27dc]::run_compiler::{closure#1}>::{closure#0}, core[82b97d3770534f31]::result::Result<(), rustc_span[46061d449caa818]::ErrorGuaranteed>>
  42:     0x7fbee102bfac - std[782566b472440107]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[cbaee814aa2dcfe5]::util::run_in_thread_pool_with_globals<rustc_interface[cbaee814aa2dcfe5]::interface::run_compiler<core[82b97d3770534f31]::result::Result<(), rustc_span[46061d449caa818]::ErrorGuaranteed>, rustc_driver_impl[356fd39593eb27dc]::run_compiler::{closure#1}>::{closure#0}, core[82b97d3770534f31]::result::Result<(), rustc_span[46061d449caa818]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[82b97d3770534f31]::result::Result<(), rustc_span[46061d449caa818]::ErrorGuaranteed>>
  43:     0x7fbee102bd6e - <<std[782566b472440107]::thread::Builder>::spawn_unchecked_<rustc_interface[cbaee814aa2dcfe5]::util::run_in_thread_pool_with_globals<rustc_interface[cbaee814aa2dcfe5]::interface::run_compiler<core[82b97d3770534f31]::result::Result<(), rustc_span[46061d449caa818]::ErrorGuaranteed>, rustc_driver_impl[356fd39593eb27dc]::run_compiler::{closure#1}>::{closure#0}, core[82b97d3770534f31]::result::Result<(), rustc_span[46061d449caa818]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[82b97d3770534f31]::result::Result<(), rustc_span[46061d449caa818]::ErrorGuaranteed>>::{closure#1} as core[82b97d3770534f31]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  44:     0x7fbedeb70ee5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h0f6550a69edefeac
                               at /rustc/ad963232d9b987d66a6f8e6ec4141f672b8b9900/library/alloc/src/boxed.rs:2007:9
  45:     0x7fbedeb70ee5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::he9892a39d805c380
                               at /rustc/ad963232d9b987d66a6f8e6ec4141f672b8b9900/library/alloc/src/boxed.rs:2007:9
  46:     0x7fbedeb70ee5 - std::sys::unix::thread::Thread::new::thread_start::h13f5e66024f16bec
                               at /rustc/ad963232d9b987d66a6f8e6ec4141f672b8b9900/library/std/src/sys/unix/thread.rs:108:17
  47:     0x7fbede90344b - <unknown>
  48:     0x7fbede986e40 - <unknown>
  49:                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 1.73.0-nightly (ad963232d 2023-07-14) running on x86_64-unknown-linux-gnu

note: compiler flags: -Z crate-attr=feature(lazy_type_alias)

query stack during panic:
#0 [typeck] type-checking `_a`
#1 [analysis] running analysis passes on this crate
end of query stack

[Noratrieb]

@matthiaskrgr can you please avoid using -Zcrate-attr in the future and directly put the attributes in the source? It makes it easier to copy it to the playground or local invocation.

[fmease]

I've got a fix already, gonna open a PR later.
@rustbot claim

[fmease]

Minimized:

#![feature(lazy_type_alias)]

enum Type {
    Variant,
}

fn main() {
    type Alias = Type;
    let _ = Alias::Variant;
}