Compiler Crash due to generic_const_exprs Feature in Rust Code

[iamanonymouscs]

Code

cat code.rs

#![feature(generic_const_exprs)]
pub trait TraitWAssocConst {
  const A: TraitWAssocConst<A=0>;
}

fn main<A: TraitWAssocConst<A=32>>() {
       A.A::B;
}

Meta

rustc --version --verbose:

rustc 1.75.0-nightly (189d6c71f 2023-11-06)
binary: rustc
commit-hash: 189d6c71f3bb6c52113b5639a80839791974fd22
commit-date: 2023-11-06
host: x86_64-unknown-linux-gnu
release: 1.75.0-nightly
LLVM version: 17.0.4

The same problem is reproduced on the stable version(1.73.0 cc66ad468 2023-10-03)

Error output

rustc code.rs

error: expected one of `(`, `.`, `;`, `?`, `}`, or an operator, found `::`
 --> code.rs:7:11
  |
7 |        A.A::B;
  |           ^^ expected one of `(`, `.`, `;`, `?`, `}`, or an operator

error[E0658]: associated const equality is incomplete
 --> code.rs:3:29
  |
3 |   const A: TraitWAssocConst<A=0>;
  |                             ^^^
  |
  = note: see issue #92827 <https://github.com/rust-lang/rust/issues/92827> for more information
  = help: add `#![feature(associated_const_equality)]` to the crate attributes to enable

error[E0658]: associated const equality is incomplete
 --> code.rs:6:29
  |
6 | fn main<A: TraitWAssocConst<A=32>>() {
  |                             ^^^^
  |
  = note: see issue #92827 <https://github.com/rust-lang/rust/issues/92827> for more information
  = help: add `#![feature(associated_const_equality)]` to the crate attributes to enable

warning: the feature `generic_const_exprs` is incomplete and may not be safe to use and/or cause compiler crashes
 --> code.rs:1:12
  |
1 | #![feature(generic_const_exprs)]
  |            ^^^^^^^^^^^^^^^^^^^
  |
  = note: see issue #76560 <https://github.com/rust-lang/rust/issues/76560> for more information
  = note: `#[warn(incomplete_features)]` on by default

warning: trait objects without an explicit `dyn` are deprecated
 --> code.rs:3:12
  |
3 |   const A: TraitWAssocConst<A=0>;
  |            ^^^^^^^^^^^^^^^^^^^^^
  |
  = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
  = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
  = note: `#[warn(bare_trait_objects)]` on by default
help: use `dyn`
  |
3 |   const A: dyn TraitWAssocConst<A=0>;
  |            +++

error[E0391]: cycle detected when computing type of `TraitWAssocConst::A`
 --> code.rs:3:3
  |
3 |   const A: TraitWAssocConst<A=0>;
  |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  |
note: ...which requires computing type of `TraitWAssocConst::A::{constant#0}`...
 --> code.rs:3:31
  |
3 |   const A: TraitWAssocConst<A=0>;
  |                               ^
  = note: ...which again requires computing type of `TraitWAssocConst::A`, completing the cycle
note: cycle used when computing type of `main::{constant#0}`
 --> code.rs:6:31
  |
6 | fn main<A: TraitWAssocConst<A=32>>() {
  |                               ^^
  = note: see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information

thread 'rustc' panicked at compiler/rustc_hir_analysis/src/collect/type_of.rs:83:22:
const parameter types cannot be generic

Backtrace

stack backtrace:
   0:     0x7f5bb99b8cfc - std::backtrace_rs::backtrace::libunwind::trace::hff25dccdeaecf15b
                               at /rustc/189d6c71f3bb6c52113b5639a80839791974fd22/library/std/src/../../backtrace/src/backtrace/libunwind.rs:104:5
   1:     0x7f5bb99b8cfc - std::backtrace_rs::backtrace::trace_unsynchronized::ha0dc8dbc3408b60f
                               at /rustc/189d6c71f3bb6c52113b5639a80839791974fd22/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f5bb99b8cfc - std::sys_common::backtrace::_print_fmt::h67df50d94423ed2e
                               at /rustc/189d6c71f3bb6c52113b5639a80839791974fd22/library/std/src/sys_common/backtrace.rs:67:5
   3:     0x7f5bb99b8cfc - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h79eed31df48d8984
                               at /rustc/189d6c71f3bb6c52113b5639a80839791974fd22/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f5bb9a1af20 - core::fmt::rt::Argument::fmt::h99f50ac8e36e39f5
                               at /rustc/189d6c71f3bb6c52113b5639a80839791974fd22/library/core/src/fmt/rt.rs:142:9
   5:     0x7f5bb9a1af20 - core::fmt::write::hb2ea303798b8ccb6
                               at /rustc/189d6c71f3bb6c52113b5639a80839791974fd22/library/core/src/fmt/mod.rs:1117:17
   6:     0x7f5bb99acc1f - std::io::Write::write_fmt::he6c1d015443731fc
                               at /rustc/189d6c71f3bb6c52113b5639a80839791974fd22/library/std/src/io/mod.rs:1763:15
   7:     0x7f5bb99b8ae4 - std::sys_common::backtrace::_print::h33ea8a0908bf5a83
                               at /rustc/189d6c71f3bb6c52113b5639a80839791974fd22/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7f5bb99b8ae4 - std::sys_common::backtrace::print::hb67f3e4f66b9e164
                               at /rustc/189d6c71f3bb6c52113b5639a80839791974fd22/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7f5bb99bb777 - std::panicking::default_hook::{{closure}}::h76dfdce76c22c872
  10:     0x7f5bb99bb4df - std::panicking::default_hook::hca996d901ebbad0a
                               at /rustc/189d6c71f3bb6c52113b5639a80839791974fd22/library/std/src/panicking.rs:292:9
  11:     0x7f5bbc6f7080 - std[892e5142f41c14f3]::panicking::update_hook::<alloc[1d1cadd2b6a1e028]::boxed::Box<rustc_driver_impl[6b462800c963f7c4]::install_ice_hook::{closure#0}>>::{closure#0}
  12:     0x7f5bb99bbeb8 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::hdc5d28b909c48685
                               at /rustc/189d6c71f3bb6c52113b5639a80839791974fd22/library/alloc/src/boxed.rs:2021:9
  13:     0x7f5bb99bbeb8 - std::panicking::rust_panic_with_hook::hf4c81c25ab4c6282
                               at /rustc/189d6c71f3bb6c52113b5639a80839791974fd22/library/std/src/panicking.rs:783:13
  14:     0x7f5bb99bbc0e - std::panicking::begin_panic_handler::{{closure}}::h434d33c2a86a1a30
                               at /rustc/189d6c71f3bb6c52113b5639a80839791974fd22/library/std/src/panicking.rs:657:13
  15:     0x7f5bb99b91c6 - std::sys_common::backtrace::__rust_end_short_backtrace::h960ab23f2fb70479
                               at /rustc/189d6c71f3bb6c52113b5639a80839791974fd22/library/std/src/sys_common/backtrace.rs:170:18
  16:     0x7f5bb99bb972 - rust_begin_unwind
                               at /rustc/189d6c71f3bb6c52113b5639a80839791974fd22/library/std/src/panicking.rs:645:5
  17:     0x7f5bb9a17645 - core::panicking::panic_fmt::h5f1a6fd39197ad62
                               at /rustc/189d6c71f3bb6c52113b5639a80839791974fd22/library/core/src/panicking.rs:72:14
  18:     0x7f5bb9a173f3 - core::panicking::panic_display::h7c73698e4b0cd283
                               at /rustc/189d6c71f3bb6c52113b5639a80839791974fd22/library/core/src/panicking.rs:178:5
  19:     0x7f5bb9a173f3 - core::panicking::panic_str::h3272a59bd2b54271
                               at /rustc/189d6c71f3bb6c52113b5639a80839791974fd22/library/core/src/panicking.rs:152:5
  20:     0x7f5bb9a173f3 - core::option::expect_failed::h851fe49db086a7b3
                               at /rustc/189d6c71f3bb6c52113b5639a80839791974fd22/library/core/src/option.rs:1985:5
  21:     0x7f5bbbbf7a57 - rustc_hir_analysis[8fdc5c642381ab7f]::collect::type_of::type_of
  22:     0x7f5bbd8d3376 - rustc_query_impl[ef19888a93dc8bb2]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[ef19888a93dc8bb2]::query_impl::type_of::dynamic_query::{closure#2}::{closure#0}, rustc_middle[636ce057eec11b97]::query::erase::Erased<[u8; 8usize]>>
  23:     0x7f5bbd8d2218 - rustc_query_system[5665b56d10d6a1cd]::query::plumbing::try_execute_query::<rustc_query_impl[ef19888a93dc8bb2]::DynamicConfig<rustc_query_system[5665b56d10d6a1cd]::query::caches::DefaultCache<rustc_span[468fcca478faa92d]::def_id::DefId, rustc_middle[636ce057eec11b97]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[ef19888a93dc8bb2]::plumbing::QueryCtxt, false>
  24:     0x7f5bbd8d1deb - rustc_query_impl[ef19888a93dc8bb2]::query_impl::type_of::get_query_non_incr::__rust_end_short_backtrace
  25:     0x7f5bbd9f1905 - rustc_middle[636ce057eec11b97]::query::plumbing::query_get_at::<rustc_query_system[5665b56d10d6a1cd]::query::caches::DefaultCache<rustc_span[468fcca478faa92d]::def_id::DefId, rustc_middle[636ce057eec11b97]::query::erase::Erased<[u8; 8usize]>>>
  26:     0x7f5bbd9f2270 - <rustc_middle[636ce057eec11b97]::ty::consts::Const>::from_anon_const
  27:     0x7f5bbdc63eab - <dyn rustc_hir_analysis[8fdc5c642381ab7f]::astconv::AstConv>::instantiate_poly_trait_ref_inner
  28:     0x7f5bbdc5dbb6 - <dyn rustc_hir_analysis[8fdc5c642381ab7f]::astconv::AstConv>::instantiate_poly_trait_ref
  29:     0x7f5bbdc5ac70 - rustc_hir_analysis[8fdc5c642381ab7f]::collect::predicates_of::gather_explicit_predicates_of
  30:     0x7f5bbdc5827c - rustc_query_impl[ef19888a93dc8bb2]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[ef19888a93dc8bb2]::query_impl::explicit_predicates_of::dynamic_query::{closure#2}::{closure#0}, rustc_middle[636ce057eec11b97]::query::erase::Erased<[u8; 24usize]>>
  31:     0x7f5bbdc56cfe - rustc_query_system[5665b56d10d6a1cd]::query::plumbing::try_execute_query::<rustc_query_impl[ef19888a93dc8bb2]::DynamicConfig<rustc_query_system[5665b56d10d6a1cd]::query::caches::DefaultCache<rustc_span[468fcca478faa92d]::def_id::DefId, rustc_middle[636ce057eec11b97]::query::erase::Erased<[u8; 24usize]>>, false, false, false>, rustc_query_impl[ef19888a93dc8bb2]::plumbing::QueryCtxt, false>
  32:     0x7f5bbdc569a0 - rustc_query_impl[ef19888a93dc8bb2]::query_impl::explicit_predicates_of::get_query_non_incr::__rust_end_short_backtrace
  33:     0x7f5bbdc57858 - rustc_hir_analysis[8fdc5c642381ab7f]::collect::predicates_defined_on
  34:     0x7f5bbdc57715 - rustc_query_impl[ef19888a93dc8bb2]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[ef19888a93dc8bb2]::query_impl::predicates_defined_on::dynamic_query::{closure#2}::{closure#0}, rustc_middle[636ce057eec11b97]::query::erase::Erased<[u8; 24usize]>>
  35:     0x7f5bbdc56cd3 - rustc_query_system[5665b56d10d6a1cd]::query::plumbing::try_execute_query::<rustc_query_impl[ef19888a93dc8bb2]::DynamicConfig<rustc_query_system[5665b56d10d6a1cd]::query::caches::DefaultCache<rustc_span[468fcca478faa92d]::def_id::DefId, rustc_middle[636ce057eec11b97]::query::erase::Erased<[u8; 24usize]>>, false, false, false>, rustc_query_impl[ef19888a93dc8bb2]::plumbing::QueryCtxt, false>
  36:     0x7f5bbdc567e0 - rustc_query_impl[ef19888a93dc8bb2]::query_impl::predicates_defined_on::get_query_non_incr::__rust_end_short_backtrace
  37:     0x7f5bbdc5575d - rustc_hir_analysis[8fdc5c642381ab7f]::collect::predicates_of::predicates_of
  38:     0x7f5bbdc55613 - rustc_query_impl[ef19888a93dc8bb2]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[ef19888a93dc8bb2]::query_impl::predicates_of::dynamic_query::{closure#2}::{closure#0}, rustc_middle[636ce057eec11b97]::query::erase::Erased<[u8; 24usize]>>
  39:     0x7f5bbdc56ca6 - rustc_query_system[5665b56d10d6a1cd]::query::plumbing::try_execute_query::<rustc_query_impl[ef19888a93dc8bb2]::DynamicConfig<rustc_query_system[5665b56d10d6a1cd]::query::caches::DefaultCache<rustc_span[468fcca478faa92d]::def_id::DefId, rustc_middle[636ce057eec11b97]::query::erase::Erased<[u8; 24usize]>>, false, false, false>, rustc_query_impl[ef19888a93dc8bb2]::plumbing::QueryCtxt, false>
  40:     0x7f5bbdc568be - rustc_query_impl[ef19888a93dc8bb2]::query_impl::predicates_of::get_query_non_incr::__rust_end_short_backtrace
  41:     0x7f5bbdcfd1e0 - <rustc_hir_analysis[8fdc5c642381ab7f]::collect::CollectItemTypesVisitor as rustc_hir[18a94961780ac4d0]::intravisit::Visitor>::visit_item
  42:     0x7f5bbdcfb2a8 - rustc_hir_analysis[8fdc5c642381ab7f]::collect::collect_mod_item_types
  43:     0x7f5bbdcfb22b - rustc_query_impl[ef19888a93dc8bb2]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[ef19888a93dc8bb2]::query_impl::collect_mod_item_types::dynamic_query::{closure#2}::{closure#0}, rustc_middle[636ce057eec11b97]::query::erase::Erased<[u8; 0usize]>>
  44:     0x7f5bbe0e16bb - rustc_query_system[5665b56d10d6a1cd]::query::plumbing::try_execute_query::<rustc_query_impl[ef19888a93dc8bb2]::DynamicConfig<rustc_query_system[5665b56d10d6a1cd]::query::caches::DefaultCache<rustc_span[468fcca478faa92d]::def_id::LocalModDefId, rustc_middle[636ce057eec11b97]::query::erase::Erased<[u8; 0usize]>>, false, false, false>, rustc_query_impl[ef19888a93dc8bb2]::plumbing::QueryCtxt, false>
  45:     0x7f5bbe0e11d7 - rustc_query_impl[ef19888a93dc8bb2]::query_impl::collect_mod_item_types::get_query_non_incr::__rust_end_short_backtrace
  46:     0x7f5bbde6db5c - rustc_hir_analysis[8fdc5c642381ab7f]::check_crate
  47:     0x7f5bbdae5ed5 - rustc_interface[8114b1518d4bcee7]::passes::analysis
  48:     0x7f5bbdae5b37 - rustc_query_impl[ef19888a93dc8bb2]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[ef19888a93dc8bb2]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[636ce057eec11b97]::query::erase::Erased<[u8; 1usize]>>
  49:     0x7f5bbe514a80 - rustc_query_system[5665b56d10d6a1cd]::query::plumbing::try_execute_query::<rustc_query_impl[ef19888a93dc8bb2]::DynamicConfig<rustc_query_system[5665b56d10d6a1cd]::query::caches::SingleCache<rustc_middle[636ce057eec11b97]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[ef19888a93dc8bb2]::plumbing::QueryCtxt, false>
  50:     0x7f5bbe514887 - rustc_query_impl[ef19888a93dc8bb2]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  51:     0x7f5bbe80e9f3 - rustc_interface[8114b1518d4bcee7]::interface::run_compiler::<core[87cb3e20dc27822]::result::Result<(), rustc_span[468fcca478faa92d]::ErrorGuaranteed>, rustc_driver_impl[6b462800c963f7c4]::run_compiler::{closure#1}>::{closure#0}
  52:     0x7f5bbe83c20a - std[892e5142f41c14f3]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[8114b1518d4bcee7]::util::run_in_thread_with_globals<rustc_interface[8114b1518d4bcee7]::util::run_in_thread_pool_with_globals<rustc_interface[8114b1518d4bcee7]::interface::run_compiler<core[87cb3e20dc27822]::result::Result<(), rustc_span[468fcca478faa92d]::ErrorGuaranteed>, rustc_driver_impl[6b462800c963f7c4]::run_compiler::{closure#1}>::{closure#0}, core[87cb3e20dc27822]::result::Result<(), rustc_span[468fcca478faa92d]::ErrorGuaranteed>>::{closure#0}, core[87cb3e20dc27822]::result::Result<(), rustc_span[468fcca478faa92d]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[87cb3e20dc27822]::result::Result<(), rustc_span[468fcca478faa92d]::ErrorGuaranteed>>
  53:     0x7f5bbe83c033 - <<std[892e5142f41c14f3]::thread::Builder>::spawn_unchecked_<rustc_interface[8114b1518d4bcee7]::util::run_in_thread_with_globals<rustc_interface[8114b1518d4bcee7]::util::run_in_thread_pool_with_globals<rustc_interface[8114b1518d4bcee7]::interface::run_compiler<core[87cb3e20dc27822]::result::Result<(), rustc_span[468fcca478faa92d]::ErrorGuaranteed>, rustc_driver_impl[6b462800c963f7c4]::run_compiler::{closure#1}>::{closure#0}, core[87cb3e20dc27822]::result::Result<(), rustc_span[468fcca478faa92d]::ErrorGuaranteed>>::{closure#0}, core[87cb3e20dc27822]::result::Result<(), rustc_span[468fcca478faa92d]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[87cb3e20dc27822]::result::Result<(), rustc_span[468fcca478faa92d]::ErrorGuaranteed>>::{closure#1} as core[87cb3e20dc27822]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  54:     0x7f5bb99c6c25 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hc46dd07e9684ac8f
                               at /rustc/189d6c71f3bb6c52113b5639a80839791974fd22/library/alloc/src/boxed.rs:2007:9
  55:     0x7f5bb99c6c25 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hd5b941b8dbca1d60
                               at /rustc/189d6c71f3bb6c52113b5639a80839791974fd22/library/alloc/src/boxed.rs:2007:9
  56:     0x7f5bb99c6c25 - std::sys::unix::thread::Thread::new::thread_start::h7b00b728bb6836be
                               at /rustc/189d6c71f3bb6c52113b5639a80839791974fd22/library/std/src/sys/unix/thread.rs:108:17
  57:     0x7f5bb98b6609 - start_thread
  58:     0x7f5bb97d9133 - clone
  59:                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: please attach the file at `/home/rustc-ice-2023-11-07T06_47_55-17512.txt` to your bug report

query stack during panic:
#0 [type_of] computing type of `main::{constant#0}`
#1 [explicit_predicates_of] computing explicit predicates of `main`
#2 [predicates_defined_on] computing predicates of `main`
#3 [predicates_of] computing predicates of `main`
#4 [collect_mod_item_types] collecting item types in top-level module
#5 [analysis] running analysis passes on this crate
end of query stack

[matthiaskrgr]

This is another duplicate of #108165