ICE: `const parameter types cannot be generic`

[matthiaskrgr]

Code

#![feature(associated_const_equality, generic_const_items)]

pub fn accept(_: impl Trait<K = 0>) {}

pub trait Trait {
    const K<'a, T: 'a + Copy, const N: usize>: Option<[T; N]> = None
where
    String: From<T>;
}

pub fn main() {}

Meta

rustc --version --verbose:

rustc 1.78.0-nightly (6cc484351 2024-02-10)
binary: rustc
commit-hash: 6cc4843512d613f51ec81aba689180c31b0b28b6
commit-date: 2024-02-10
host: x86_64-unknown-linux-gnu
release: 1.78.0-nightly
LLVM version: 17.0.6

Error output

Backtrace

warning: the feature `generic_const_items` is incomplete and may not be safe to use and/or cause compiler crashes
 --> FC6B3BDBC59A37E6F55C4D01B943A64E13A55DD84FCE5FB628C66A4F8E6C0DC1.rs:1:39
  |
1 | #![feature(associated_const_equality, generic_const_items)]
  |                                       ^^^^^^^^^^^^^^^^^^^
  |
  = note: see issue #113521 <https://github.com/rust-lang/rust/issues/113521> for more information
  = note: `#[warn(incomplete_features)]` on by default

thread 'rustc' panicked at compiler/rustc_hir_analysis/src/collect/type_of.rs:101:22:
const parameter types cannot be generic
stack backtrace:
   0:     0x7f1763f8b936 - std::backtrace_rs::backtrace::libunwind::trace::hce337a0fd0c5e1da
                               at /rustc/6cc4843512d613f51ec81aba689180c31b0b28b6/library/std/src/../../backtrace/src/backtrace/libunwind.rs:104:5
   1:     0x7f1763f8b936 - std::backtrace_rs::backtrace::trace_unsynchronized::hbc9b4a5cec9b81eb
                               at /rustc/6cc4843512d613f51ec81aba689180c31b0b28b6/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f1763f8b936 - std::sys_common::backtrace::_print_fmt::habe453adcd959f3b
                               at /rustc/6cc4843512d613f51ec81aba689180c31b0b28b6/library/std/src/sys_common/backtrace.rs:68:5
   3:     0x7f1763f8b936 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h67bb2d10ecb8af10
                               at /rustc/6cc4843512d613f51ec81aba689180c31b0b28b6/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f1763fde380 - core::fmt::rt::Argument::fmt::hd5debad710e176b4
                               at /rustc/6cc4843512d613f51ec81aba689180c31b0b28b6/library/core/src/fmt/rt.rs:142:9
   5:     0x7f1763fde380 - core::fmt::write::h5987d5bee25e3bd6
                               at /rustc/6cc4843512d613f51ec81aba689180c31b0b28b6/library/core/src/fmt/mod.rs:1120:17
   6:     0x7f1763f7f0ef - std::io::Write::write_fmt::h0876e0f4bddb923c
                               at /rustc/6cc4843512d613f51ec81aba689180c31b0b28b6/library/std/src/io/mod.rs:1854:15
   7:     0x7f1763f8b714 - std::sys_common::backtrace::_print::h4ae69e83d64cbf46
                               at /rustc/6cc4843512d613f51ec81aba689180c31b0b28b6/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7f1763f8b714 - std::sys_common::backtrace::print::h1d97d5831d0262fb
                               at /rustc/6cc4843512d613f51ec81aba689180c31b0b28b6/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7f1763f8e4d7 - std::panicking::default_hook::{{closure}}::h39fabb1b3e65f47a
  10:     0x7f1763f8e239 - std::panicking::default_hook::h416520d6bb2cb53f
                               at /rustc/6cc4843512d613f51ec81aba689180c31b0b28b6/library/std/src/panicking.rs:292:9
  11:     0x7f1766d266dc - std[3acc11fb688f3d76]::panicking::update_hook::<alloc[408654ec2a1215fa]::boxed::Box<rustc_driver_impl[a7481a600b2f11a0]::install_ice_hook::{closure#0}>>::{closure#0}
  12:     0x7f1763f8ec26 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h2450ecbe2b1c1ea3
                               at /rustc/6cc4843512d613f51ec81aba689180c31b0b28b6/library/alloc/src/boxed.rs:2030:9
  13:     0x7f1763f8ec26 - std::panicking::rust_panic_with_hook::h99ef5cbc4b3b0ae4
                               at /rustc/6cc4843512d613f51ec81aba689180c31b0b28b6/library/std/src/panicking.rs:785:13
  14:     0x7f1763f8e972 - std::panicking::begin_panic_handler::{{closure}}::h2284f60633c08873
                               at /rustc/6cc4843512d613f51ec81aba689180c31b0b28b6/library/std/src/panicking.rs:659:13
  15:     0x7f1763f8be36 - std::sys_common::backtrace::__rust_end_short_backtrace::h84bc49437da26b5c
                               at /rustc/6cc4843512d613f51ec81aba689180c31b0b28b6/library/std/src/sys_common/backtrace.rs:171:18
  16:     0x7f1763f8e6c4 - rust_begin_unwind
                               at /rustc/6cc4843512d613f51ec81aba689180c31b0b28b6/library/std/src/panicking.rs:647:5
  17:     0x7f1763fdaa85 - core::panicking::panic_fmt::hfa0af2309df9012f
                               at /rustc/6cc4843512d613f51ec81aba689180c31b0b28b6/library/core/src/panicking.rs:72:14
  18:     0x7f1763fda833 - core::panicking::panic_display::h5e88803d35c951b0
                               at /rustc/6cc4843512d613f51ec81aba689180c31b0b28b6/library/core/src/panicking.rs:196:5
  19:     0x7f1763fda833 - core::panicking::panic_str::h1fa7a90d3180c5de
                               at /rustc/6cc4843512d613f51ec81aba689180c31b0b28b6/library/core/src/panicking.rs:171:5
  20:     0x7f1763fda833 - core::option::expect_failed::hee4b38d562c1aee6
                               at /rustc/6cc4843512d613f51ec81aba689180c31b0b28b6/library/core/src/option.rs:1992:5
  21:     0x7f1766557f0f - rustc_hir_analysis[1799a6ccb3095d3d]::collect::type_of::type_of
  22:     0x7f1768075866 - rustc_query_impl[60cfa4eef1128f6c]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[60cfa4eef1128f6c]::query_impl::type_of::dynamic_query::{closure#2}::{closure#0}, rustc_middle[9f94bb95ba4eb693]::query::erase::Erased<[u8; 8usize]>>
  23:     0x7f17680744e1 - rustc_query_system[30cc65df29d7d3a8]::query::plumbing::try_execute_query::<rustc_query_impl[60cfa4eef1128f6c]::DynamicConfig<rustc_query_system[30cc65df29d7d3a8]::query::caches::DefIdCache<rustc_middle[9f94bb95ba4eb693]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[60cfa4eef1128f6c]::plumbing::QueryCtxt, false>
  24:     0x7f1768073fdd - rustc_query_impl[60cfa4eef1128f6c]::query_impl::type_of::get_query_non_incr::__rust_end_short_backtrace
  25:     0x7f176823af7c - rustc_middle[9f94bb95ba4eb693]::query::plumbing::query_get_at::<rustc_query_system[30cc65df29d7d3a8]::query::caches::DefIdCache<rustc_middle[9f94bb95ba4eb693]::query::erase::Erased<[u8; 8usize]>>>
  26:     0x7f1768878b56 - <rustc_middle[9f94bb95ba4eb693]::ty::consts::Const>::from_anon_const
  27:     0x7f1768ab8ded - <dyn rustc_hir_analysis[1799a6ccb3095d3d]::astconv::AstConv>::instantiate_poly_trait_ref
  28:     0x7f1768870842 - rustc_hir_analysis[1799a6ccb3095d3d]::collect::predicates_of::gather_explicit_predicates_of
  29:     0x7f1768181aef - rustc_query_impl[60cfa4eef1128f6c]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[60cfa4eef1128f6c]::query_impl::explicit_predicates_of::dynamic_query::{closure#2}::{closure#0}, rustc_middle[9f94bb95ba4eb693]::query::erase::Erased<[u8; 24usize]>>
  30:     0x7f1768180d0e - rustc_query_system[30cc65df29d7d3a8]::query::plumbing::try_execute_query::<rustc_query_impl[60cfa4eef1128f6c]::DynamicConfig<rustc_query_system[30cc65df29d7d3a8]::query::caches::DefIdCache<rustc_middle[9f94bb95ba4eb693]::query::erase::Erased<[u8; 24usize]>>, false, false, false>, rustc_query_impl[60cfa4eef1128f6c]::plumbing::QueryCtxt, false>
  31:     0x7f1768000260 - rustc_query_impl[60cfa4eef1128f6c]::query_impl::explicit_predicates_of::get_query_non_incr::__rust_end_short_backtrace
  32:     0x7f17680f9e1c - rustc_hir_analysis[1799a6ccb3095d3d]::collect::predicates_defined_on
  33:     0x7f17680f9d13 - rustc_query_impl[60cfa4eef1128f6c]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[60cfa4eef1128f6c]::query_impl::predicates_defined_on::dynamic_query::{closure#2}::{closure#0}, rustc_middle[9f94bb95ba4eb693]::query::erase::Erased<[u8; 24usize]>>
  34:     0x7f1768180cf6 - rustc_query_system[30cc65df29d7d3a8]::query::plumbing::try_execute_query::<rustc_query_impl[60cfa4eef1128f6c]::DynamicConfig<rustc_query_system[30cc65df29d7d3a8]::query::caches::DefIdCache<rustc_middle[9f94bb95ba4eb693]::query::erase::Erased<[u8; 24usize]>>, false, false, false>, rustc_query_impl[60cfa4eef1128f6c]::plumbing::QueryCtxt, false>
  35:     0x7f17681808e0 - rustc_query_impl[60cfa4eef1128f6c]::query_impl::predicates_defined_on::get_query_non_incr::__rust_end_short_backtrace
  36:     0x7f176817f955 - rustc_hir_analysis[1799a6ccb3095d3d]::collect::predicates_of::predicates_of
  37:     0x7f176817f865 - rustc_query_impl[60cfa4eef1128f6c]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[60cfa4eef1128f6c]::query_impl::predicates_of::dynamic_query::{closure#2}::{closure#0}, rustc_middle[9f94bb95ba4eb693]::query::erase::Erased<[u8; 24usize]>>
  38:     0x7f1768180cc9 - rustc_query_system[30cc65df29d7d3a8]::query::plumbing::try_execute_query::<rustc_query_impl[60cfa4eef1128f6c]::DynamicConfig<rustc_query_system[30cc65df29d7d3a8]::query::caches::DefIdCache<rustc_middle[9f94bb95ba4eb693]::query::erase::Erased<[u8; 24usize]>>, false, false, false>, rustc_query_impl[60cfa4eef1128f6c]::plumbing::QueryCtxt, false>
  39:     0x7f17681809be - rustc_query_impl[60cfa4eef1128f6c]::query_impl::predicates_of::get_query_non_incr::__rust_end_short_backtrace
  40:     0x7f1768384878 - <rustc_hir_analysis[1799a6ccb3095d3d]::collect::CollectItemTypesVisitor as rustc_hir[3813da9c3dbe6953]::intravisit::Visitor>::visit_item
  41:     0x7f1768382b6a - rustc_hir_analysis[1799a6ccb3095d3d]::collect::collect_mod_item_types
  42:     0x7f1768382ae7 - rustc_query_impl[60cfa4eef1128f6c]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[60cfa4eef1128f6c]::query_impl::collect_mod_item_types::dynamic_query::{closure#2}::{closure#0}, rustc_middle[9f94bb95ba4eb693]::query::erase::Erased<[u8; 0usize]>>
  43:     0x7f1768b2cb7b - rustc_query_system[30cc65df29d7d3a8]::query::plumbing::try_execute_query::<rustc_query_impl[60cfa4eef1128f6c]::DynamicConfig<rustc_query_system[30cc65df29d7d3a8]::query::caches::DefaultCache<rustc_span[4a89bdba9678f8e0]::def_id::LocalModDefId, rustc_middle[9f94bb95ba4eb693]::query::erase::Erased<[u8; 0usize]>>, false, false, false>, rustc_query_impl[60cfa4eef1128f6c]::plumbing::QueryCtxt, false>
  44:     0x7f1768b2c69f - rustc_query_impl[60cfa4eef1128f6c]::query_impl::collect_mod_item_types::get_query_non_incr::__rust_end_short_backtrace
  45:     0x7f17681cfa52 - rustc_hir_analysis[1799a6ccb3095d3d]::check_crate
  46:     0x7f176898bd92 - rustc_interface[57a4cb1189ffa880]::passes::analysis
  47:     0x7f176898b9df - rustc_query_impl[60cfa4eef1128f6c]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[60cfa4eef1128f6c]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[9f94bb95ba4eb693]::query::erase::Erased<[u8; 1usize]>>
  48:     0x7f1768d24372 - rustc_query_system[30cc65df29d7d3a8]::query::plumbing::try_execute_query::<rustc_query_impl[60cfa4eef1128f6c]::DynamicConfig<rustc_query_system[30cc65df29d7d3a8]::query::caches::SingleCache<rustc_middle[9f94bb95ba4eb693]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[60cfa4eef1128f6c]::plumbing::QueryCtxt, false>
  49:     0x7f1768d240d5 - rustc_query_impl[60cfa4eef1128f6c]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  50:     0x7f1768d3a582 - rustc_interface[57a4cb1189ffa880]::interface::run_compiler::<core[8df037f8ced6ea1f]::result::Result<(), rustc_span[4a89bdba9678f8e0]::ErrorGuaranteed>, rustc_driver_impl[a7481a600b2f11a0]::run_compiler::{closure#0}>::{closure#0}
  51:     0x7f1768dd2b46 - std[3acc11fb688f3d76]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[57a4cb1189ffa880]::util::run_in_thread_with_globals<rustc_interface[57a4cb1189ffa880]::util::run_in_thread_pool_with_globals<rustc_interface[57a4cb1189ffa880]::interface::run_compiler<core[8df037f8ced6ea1f]::result::Result<(), rustc_span[4a89bdba9678f8e0]::ErrorGuaranteed>, rustc_driver_impl[a7481a600b2f11a0]::run_compiler::{closure#0}>::{closure#0}, core[8df037f8ced6ea1f]::result::Result<(), rustc_span[4a89bdba9678f8e0]::ErrorGuaranteed>>::{closure#0}, core[8df037f8ced6ea1f]::result::Result<(), rustc_span[4a89bdba9678f8e0]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[8df037f8ced6ea1f]::result::Result<(), rustc_span[4a89bdba9678f8e0]::ErrorGuaranteed>>
  52:     0x7f1768dd2973 - <<std[3acc11fb688f3d76]::thread::Builder>::spawn_unchecked_<rustc_interface[57a4cb1189ffa880]::util::run_in_thread_with_globals<rustc_interface[57a4cb1189ffa880]::util::run_in_thread_pool_with_globals<rustc_interface[57a4cb1189ffa880]::interface::run_compiler<core[8df037f8ced6ea1f]::result::Result<(), rustc_span[4a89bdba9678f8e0]::ErrorGuaranteed>, rustc_driver_impl[a7481a600b2f11a0]::run_compiler::{closure#0}>::{closure#0}, core[8df037f8ced6ea1f]::result::Result<(), rustc_span[4a89bdba9678f8e0]::ErrorGuaranteed>>::{closure#0}, core[8df037f8ced6ea1f]::result::Result<(), rustc_span[4a89bdba9678f8e0]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[8df037f8ced6ea1f]::result::Result<(), rustc_span[4a89bdba9678f8e0]::ErrorGuaranteed>>::{closure#1} as core[8df037f8ced6ea1f]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  53:     0x7f1763f97eb5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h61e4d902e063b23d
                               at /rustc/6cc4843512d613f51ec81aba689180c31b0b28b6/library/alloc/src/boxed.rs:2016:9
  54:     0x7f1763f97eb5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hfa3eaf4f75275f59
                               at /rustc/6cc4843512d613f51ec81aba689180c31b0b28b6/library/alloc/src/boxed.rs:2016:9
  55:     0x7f1763f97eb5 - std::sys::pal::unix::thread::Thread::new::thread_start::hb901d27f412b0ecd
                               at /rustc/6cc4843512d613f51ec81aba689180c31b0b28b6/library/std/src/sys/pal/unix/thread.rs:108:17
  56:     0x7f1763d819eb - <unknown>
  57:     0x7f1763e057cc - <unknown>
  58:                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 `/tmp/im/rustc-ice-2024-02-11T17_08_31-2205227.txt` to your bug report

query stack during panic:
#0 [type_of] computing type of `accept::{constant#0}`
#1 [explicit_predicates_of] computing explicit predicates of `accept`
#2 [predicates_defined_on] computing predicates of `accept`
#3 [predicates_of] computing predicates of `accept`
#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]

Regression in nightly-2023-07-29

commit[0] 2023-07-27: Auto merge of #114144 - workingjubilee:rollup-jkmtgdo, r=workingjubilee
commit[1] 2023-07-27: Auto merge of #108980 - Enselic:println-and-broken-pipe, r=workingjubilee
commit[2] 2023-07-28: Auto merge of #114115 - nnethercote:less-token-tree-cloning, r=petrochenkov
commit[3] 2023-07-28: Auto merge of #97571 - ehuss:symbol-mangling, r=michaelwoerister
commit[4] 2023-07-28: Auto merge of #112390 - MoskalykA:move-two-tests-from-library-to-tests, r=workingjubilee
commit[5] 2023-07-28: Auto merge of #114154 - calebcartwright:style-match-mac, r=joshtriplett
commit[6] 2023-07-28: Auto merge of #114134 - fee1-dead-contrib:rm-constness-from-param-env, r=oli-obk
commit[7] 2023-07-28: Auto merge of #113312 - Ddystopia:auto-trait-fun, r=lcnr
commit[8] 2023-07-28: Auto merge of #114119 - nnethercote:opt-TokenKind-clone, r=petrochenkov
commit[9] 2023-07-28: Auto merge of #111780 - weiznich:diagnostic_namespace, r=petrochenkov
commit[10] 2023-07-28: Auto merge of #113931 - cuviper:ci-ubuntu-22.04, r=Mark-Simulacrum
commit[11] 2023-07-28: Auto merge of #113522 - fmease:generic-consts, r=cjgillot
ERROR: no CI builds available between 500647f and 04abc37 within last 167 days