ICE (Internal Compiler Error) triggered in code with const generics and enum initialization

[iamanonymouscs]

I got this code by our own fuzzing tool.
This ICE looks like #114317 ,and it also caused by generic_const_exprs😂

Code

#![feature(generic_const_exprs)]

const fn t<const N: usize>() -> u8 {

    N as u8

}

#[repr(u8)]

enum T<const N: u8 = { T::<0>::A as u8 + T::<0>::B as u8 }>

where

    [(); N as usize]:,

    T: ?Sized,

{

    A,

}

fn main() {
    A = t::<N>() as u8,

    B,

}

Meta

rustc --version --verbose:

rustc 1.73.0 (cc66ad468 2023-10-03)
binary: rustc
commit-hash: cc66ad468955717ab92600c770da8c1601a4ff33
commit-date: 2023-10-03
host: x86_64-unknown-linux-gnu
release: 1.73.0
LLVM version: 17.0.2

It can also be reproduced by nightly(2023-10-8)

Error output

error: expected one of `!`, `(`, `.`, `::`, `;`, `<`, `?`, or `}`, found `,`
  --> interesting/code.rs:26:23
   |
26 |     A = t::<N>() as u8,
   |                       ^ expected one of 8 possible tokens

error[E0554]: `#![feature]` may not be used on the stable release channel
 --> interesting/code.rs:1:1
  |
1 | #![feature(generic_const_exprs)]
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

warning: the feature `generic_const_exprs` is incomplete and may not be safe to use and/or cause compiler crashes
 --> interesting/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

error: `?Trait` bounds are only permitted at the point where a type parameter is declared
  --> interesting/code.rs:17:8
   |
17 |     T: ?Sized,
   |        ^^^^^^

error: internal compiler error: compiler/rustc_middle/src/ty/generic_args.rs:942:9: const parameter `N/#0` (Const { ty: u8, kind: N/#0 }/0) out of range when substituting args=[]

thread 'rustc' panicked at /rustc/cc66ad468955717ab92600c770da8c1601a4ff33/compiler/rustc_errors/src/lib.rs:1635:9:
Box<dyn Any>

Backtrace

stack backtrace:
   0:     0x7fa258a4849c - std::backtrace_rs::backtrace::libunwind::trace::he43a6a3949163f8c
                               at /rustc/cc66ad468955717ab92600c770da8c1601a4ff33/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7fa258a4849c - std::backtrace_rs::backtrace::trace_unsynchronized::h50db52ca99f692e7
                               at /rustc/cc66ad468955717ab92600c770da8c1601a4ff33/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7fa258a4849c - std::sys_common::backtrace::_print_fmt::hd37d595f2ceb2d3c
                               at /rustc/cc66ad468955717ab92600c770da8c1601a4ff33/library/std/src/sys_common/backtrace.rs:67:5
   3:     0x7fa258a4849c - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h678bbcf9da6d7d75
                               at /rustc/cc66ad468955717ab92600c770da8c1601a4ff33/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7fa258aae3fc - core::fmt::rt::Argument::fmt::h3a159adc080a6fc9
                               at /rustc/cc66ad468955717ab92600c770da8c1601a4ff33/library/core/src/fmt/rt.rs:138:9
   5:     0x7fa258aae3fc - core::fmt::write::hb8eaf5a8e45a738e
                               at /rustc/cc66ad468955717ab92600c770da8c1601a4ff33/library/core/src/fmt/mod.rs:1094:21
   6:     0x7fa258a3b12e - std::io::Write::write_fmt::h9663fe36b2ee08f9
                               at /rustc/cc66ad468955717ab92600c770da8c1601a4ff33/library/std/src/io/mod.rs:1714:15
   7:     0x7fa258a48284 - std::sys_common::backtrace::_print::hcd4834796ee88ad2
                               at /rustc/cc66ad468955717ab92600c770da8c1601a4ff33/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7fa258a48284 - std::sys_common::backtrace::print::h1360e9450e4f922a
                               at /rustc/cc66ad468955717ab92600c770da8c1601a4ff33/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7fa258a4b193 - std::panicking::default_hook::{{closure}}::h2609fa95cd5ab1f4
                               at /rustc/cc66ad468955717ab92600c770da8c1601a4ff33/library/std/src/panicking.rs:270:22
  10:     0x7fa258a4aeac - std::panicking::default_hook::h6d75f5747cab6e8d
                               at /rustc/cc66ad468955717ab92600c770da8c1601a4ff33/library/std/src/panicking.rs:290:9
  11:     0x7fa25bc15a3e - <alloc[98253621d83cbf53]::boxed::Box<rustc_driver_impl[566d207f92c3d9d2]::install_ice_hook::{closure#0}> as core[d28c4e8d9c4eebaa]::ops::function::Fn<(&dyn for<'a, 'b> core[d28c4e8d9c4eebaa]::ops::function::Fn<(&'a core[d28c4e8d9c4eebaa]::panic::panic_info::PanicInfo<'b>,), Output = ()> + core[d28c4e8d9c4eebaa]::marker::Sync + core[d28c4e8d9c4eebaa]::marker::Send, &core[d28c4e8d9c4eebaa]::panic::panic_info::PanicInfo)>>::call
  12:     0x7fa258a4b9be - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h05249de742e1768e
                               at /rustc/cc66ad468955717ab92600c770da8c1601a4ff33/library/alloc/src/boxed.rs:2021:9
  13:     0x7fa258a4b9be - std::panicking::rust_panic_with_hook::h57e78470c47c84de
                               at /rustc/cc66ad468955717ab92600c770da8c1601a4ff33/library/std/src/panicking.rs:711:13
  14:     0x7fa25c166521 - std[3759e478f3a6c4f2]::panicking::begin_panic::<rustc_errors[f3962fbeb8edb247]::ExplicitBug>::{closure#0}
  15:     0x7fa25c162206 - std[3759e478f3a6c4f2]::sys_common::backtrace::__rust_end_short_backtrace::<std[3759e478f3a6c4f2]::panicking::begin_panic<rustc_errors[f3962fbeb8edb247]::ExplicitBug>::{closure#0}, !>
  16:     0x7fa25c12c6c6 - std[3759e478f3a6c4f2]::panicking::begin_panic::<rustc_errors[f3962fbeb8edb247]::ExplicitBug>
  17:     0x7fa25c139134 - <rustc_errors[f3962fbeb8edb247]::HandlerInner>::bug::<alloc[98253621d83cbf53]::string::String>
  18:     0x7fa25c138fc6 - <rustc_errors[f3962fbeb8edb247]::Handler>::bug::<alloc[98253621d83cbf53]::string::String>
  19:     0x7fa25c1e05ac - rustc_middle[5935fdd60c99b3fe]::util::bug::opt_span_bug_fmt::<rustc_span[4c9f011e8b033119]::span_encoding::Span>::{closure#0}
  20:     0x7fa25c1dec5a - rustc_middle[5935fdd60c99b3fe]::ty::context::tls::with_opt::<rustc_middle[5935fdd60c99b3fe]::util::bug::opt_span_bug_fmt<rustc_span[4c9f011e8b033119]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  21:     0x7fa25c1dec28 - rustc_middle[5935fdd60c99b3fe]::ty::context::tls::with_context_opt::<rustc_middle[5935fdd60c99b3fe]::ty::context::tls::with_opt<rustc_middle[5935fdd60c99b3fe]::util::bug::opt_span_bug_fmt<rustc_span[4c9f011e8b033119]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  22:     0x7fa25a4e21b0 - rustc_middle[5935fdd60c99b3fe]::util::bug::bug_fmt
  23:     0x7fa25c15d620 - <rustc_middle[5935fdd60c99b3fe]::ty::generic_args::ArgFolder>::const_param_out_of_range
  24:     0x7fa25a7519ad - <rustc_middle[5935fdd60c99b3fe]::ty::generic_args::ArgFolder as rustc_type_ir[230b024fbe18c114]::fold::FallibleTypeFolder<rustc_middle[5935fdd60c99b3fe]::ty::context::TyCtxt>>::try_fold_const
  25:     0x7fa259d19971 - <&rustc_middle[5935fdd60c99b3fe]::ty::list::List<rustc_middle[5935fdd60c99b3fe]::ty::generic_args::GenericArg> as rustc_type_ir[230b024fbe18c114]::fold::TypeFoldable<rustc_middle[5935fdd60c99b3fe]::ty::context::TyCtxt>>::try_fold_with::<rustc_middle[5935fdd60c99b3fe]::ty::generic_args::ArgFolder>
  26:     0x7fa259d079f5 - <rustc_middle[5935fdd60c99b3fe]::ty::consts::Const as rustc_type_ir[230b024fbe18c114]::fold::TypeSuperFoldable<rustc_middle[5935fdd60c99b3fe]::ty::context::TyCtxt>>::try_super_fold_with::<rustc_middle[5935fdd60c99b3fe]::ty::generic_args::ArgFolder>
  27:     0x7fa259d06e66 - <rustc_middle[5935fdd60c99b3fe]::ty::generic_args::GenericArg as rustc_type_ir[230b024fbe18c114]::fold::TypeFoldable<rustc_middle[5935fdd60c99b3fe]::ty::context::TyCtxt>>::try_fold_with::<rustc_middle[5935fdd60c99b3fe]::ty::generic_args::ArgFolder>
  28:     0x7fa25a4ff7d0 - <rustc_middle[5935fdd60c99b3fe]::ty::generics::GenericPredicates>::instantiate_into
  29:     0x7fa259fb67e0 - <rustc_trait_selection[48b7f7e13fbddf35]::traits::wf::WfPredicates>::nominal_obligations
  30:     0x7fa259f98415 - <rustc_trait_selection[48b7f7e13fbddf35]::traits::wf::WfPredicates>::compute
  31:     0x7fa259f877a2 - <rustc_trait_selection[48b7f7e13fbddf35]::traits::fulfill::FulfillProcessor as rustc_data_structures[29929b1a5d4d6700]::obligation_forest::ObligationProcessor>::process_obligation
  32:     0x7fa259f83074 - <rustc_data_structures[29929b1a5d4d6700]::obligation_forest::ObligationForest<rustc_trait_selection[48b7f7e13fbddf35]::traits::fulfill::PendingPredicateObligation>>::process_obligations::<rustc_trait_selection[48b7f7e13fbddf35]::traits::fulfill::FulfillProcessor>
  33:     0x7fa25a5da251 - <rustc_trait_selection[48b7f7e13fbddf35]::traits::engine::ObligationCtxt>::select_all_or_error
  34:     0x7fa25a526729 - rustc_hir_analysis[9bbb5014796bfef7]::check::wfcheck::check_type_defn
  35:     0x7fa25a50429e - rustc_hir_analysis[9bbb5014796bfef7]::check::wfcheck::check_well_formed
  36:     0x7fa259cea44c - rustc_query_impl[778daaabc67f3fff]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[778daaabc67f3fff]::query_impl::check_well_formed::dynamic_query::{closure#2}::{closure#0}, rustc_middle[5935fdd60c99b3fe]::query::erase::Erased<[u8; 0usize]>>
  37:     0x7fa25a5ed077 - rustc_query_system[e0e328d29a6e1c80]::query::plumbing::try_execute_query::<rustc_query_impl[778daaabc67f3fff]::DynamicConfig<rustc_query_system[e0e328d29a6e1c80]::query::caches::VecCache<rustc_hir[eee75afb991cf387]::hir_id::OwnerId, rustc_middle[5935fdd60c99b3fe]::query::erase::Erased<[u8; 0usize]>>, false, false, false>, rustc_query_impl[778daaabc67f3fff]::plumbing::QueryCtxt, false>
  38:     0x7fa25a5ecd84 - rustc_query_impl[778daaabc67f3fff]::query_impl::check_well_formed::get_query_non_incr::__rust_end_short_backtrace
  39:     0x7fa25adbcc00 - rustc_data_structures[29929b1a5d4d6700]::sync::par_for_each_in::<&[rustc_hir[eee75afb991cf387]::hir::ImplItemId], <rustc_middle[5935fdd60c99b3fe]::hir::ModuleItems>::par_impl_items<rustc_hir_analysis[9bbb5014796bfef7]::check::wfcheck::check_mod_type_wf::{closure#1}>::{closure#0}>
  40:     0x7fa25adbca7f - rustc_hir_analysis[9bbb5014796bfef7]::check::wfcheck::check_mod_type_wf
  41:     0x7fa25a94ba3c - rustc_query_impl[778daaabc67f3fff]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[778daaabc67f3fff]::query_impl::check_mod_type_wf::dynamic_query::{closure#2}::{closure#0}, rustc_middle[5935fdd60c99b3fe]::query::erase::Erased<[u8; 0usize]>>
  42:     0x7fa25a94ba1e - <rustc_query_impl[778daaabc67f3fff]::query_impl::check_mod_type_wf::dynamic_query::{closure#2} as core[d28c4e8d9c4eebaa]::ops::function::FnOnce<(rustc_middle[5935fdd60c99b3fe]::ty::context::TyCtxt, rustc_span[4c9f011e8b033119]::def_id::LocalModDefId)>>::call_once
  43:     0x7fa25aba35e3 - rustc_query_system[e0e328d29a6e1c80]::query::plumbing::try_execute_query::<rustc_query_impl[778daaabc67f3fff]::DynamicConfig<rustc_query_system[e0e328d29a6e1c80]::query::caches::DefaultCache<rustc_span[4c9f011e8b033119]::def_id::LocalModDefId, rustc_middle[5935fdd60c99b3fe]::query::erase::Erased<[u8; 0usize]>>, false, false, false>, rustc_query_impl[778daaabc67f3fff]::plumbing::QueryCtxt, false>
  44:     0x7fa25b589234 - rustc_query_impl[778daaabc67f3fff]::query_impl::check_mod_type_wf::get_query_non_incr::__rust_end_short_backtrace
  45:     0x7fa25addd8b3 - rustc_data_structures[29929b1a5d4d6700]::sync::par_for_each_in::<&[rustc_hir[eee75afb991cf387]::hir_id::OwnerId], <rustc_middle[5935fdd60c99b3fe]::hir::map::Map>::par_for_each_module<rustc_hir_analysis[9bbb5014796bfef7]::check_crate::{closure#5}::{closure#0}::{closure#0}>::{closure#0}>
  46:     0x7fa25addcc6e - rustc_hir_analysis[9bbb5014796bfef7]::check_crate
  47:     0x7fa25add349a - rustc_interface[5bdd18de9f5858d8]::passes::analysis
  48:     0x7fa25b11b70a - rustc_query_impl[778daaabc67f3fff]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[778daaabc67f3fff]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[5935fdd60c99b3fe]::query::erase::Erased<[u8; 1usize]>>
  49:     0x7fa25b11b6f9 - <rustc_query_impl[778daaabc67f3fff]::query_impl::analysis::dynamic_query::{closure#2} as core[d28c4e8d9c4eebaa]::ops::function::FnOnce<(rustc_middle[5935fdd60c99b3fe]::ty::context::TyCtxt, ())>>::call_once
  50:     0x7fa25b2bdbe8 - rustc_query_system[e0e328d29a6e1c80]::query::plumbing::try_execute_query::<rustc_query_impl[778daaabc67f3fff]::DynamicConfig<rustc_query_system[e0e328d29a6e1c80]::query::caches::SingleCache<rustc_middle[5935fdd60c99b3fe]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[778daaabc67f3fff]::plumbing::QueryCtxt, false>
  51:     0x7fa25b2bd969 - rustc_query_impl[778daaabc67f3fff]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  52:     0x7fa25aec7973 - <rustc_interface[5bdd18de9f5858d8]::queries::QueryResult<&rustc_middle[5935fdd60c99b3fe]::ty::context::GlobalCtxt>>::enter::<core[d28c4e8d9c4eebaa]::result::Result<(), rustc_span[4c9f011e8b033119]::ErrorGuaranteed>, rustc_driver_impl[566d207f92c3d9d2]::run_compiler::{closure#1}::{closure#2}::{closure#6}>
  53:     0x7fa25aec694a - <rustc_interface[5bdd18de9f5858d8]::interface::Compiler>::enter::<rustc_driver_impl[566d207f92c3d9d2]::run_compiler::{closure#1}::{closure#2}, core[d28c4e8d9c4eebaa]::result::Result<core[d28c4e8d9c4eebaa]::option::Option<rustc_interface[5bdd18de9f5858d8]::queries::Linker>, rustc_span[4c9f011e8b033119]::ErrorGuaranteed>>
  54:     0x7fa25aec3c68 - std[3759e478f3a6c4f2]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[5bdd18de9f5858d8]::util::run_in_thread_pool_with_globals<rustc_interface[5bdd18de9f5858d8]::interface::run_compiler<core[d28c4e8d9c4eebaa]::result::Result<(), rustc_span[4c9f011e8b033119]::ErrorGuaranteed>, rustc_driver_impl[566d207f92c3d9d2]::run_compiler::{closure#1}>::{closure#0}, core[d28c4e8d9c4eebaa]::result::Result<(), rustc_span[4c9f011e8b033119]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[d28c4e8d9c4eebaa]::result::Result<(), rustc_span[4c9f011e8b033119]::ErrorGuaranteed>>
  55:     0x7fa25aec33ee - <<std[3759e478f3a6c4f2]::thread::Builder>::spawn_unchecked_<rustc_interface[5bdd18de9f5858d8]::util::run_in_thread_pool_with_globals<rustc_interface[5bdd18de9f5858d8]::interface::run_compiler<core[d28c4e8d9c4eebaa]::result::Result<(), rustc_span[4c9f011e8b033119]::ErrorGuaranteed>, rustc_driver_impl[566d207f92c3d9d2]::run_compiler::{closure#1}>::{closure#0}, core[d28c4e8d9c4eebaa]::result::Result<(), rustc_span[4c9f011e8b033119]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[d28c4e8d9c4eebaa]::result::Result<(), rustc_span[4c9f011e8b033119]::ErrorGuaranteed>>::{closure#1} as core[d28c4e8d9c4eebaa]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  56:     0x7fa258a56295 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::haadd4e5af2ab0d62
                               at /rustc/cc66ad468955717ab92600c770da8c1601a4ff33/library/alloc/src/boxed.rs:2007:9
  57:     0x7fa258a56295 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::he4ba1fb09c16d807
                               at /rustc/cc66ad468955717ab92600c770da8c1601a4ff33/library/alloc/src/boxed.rs:2007:9
  58:     0x7fa258a56295 - std::sys::unix::thread::Thread::new::thread_start::he524ecf4b47bee95
                               at /rustc/cc66ad468955717ab92600c770da8c1601a4ff33/library/std/src/sys/unix/thread.rs:108:17
  59:     0x7fa25891a609 - start_thread
  60:     0x7fa25883d133 - clone
  61:                0x0 - <unknown>

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 (cc66ad468 2023-10-03) running on x86_64-unknown-linux-gnu

query stack during panic:
#0 [check_well_formed] checking that `T` 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: aborting due to 4 previous errors; 1 warning emitted