ICE: `const evaluatable failed for non-unevaluated const`

[matthiaskrgr]

Code

#![feature(generic_const_exprs)]

fn foo<const N: usize>(
    _: [u8; {
        {
            N
        }
    }],
) {
}

fn ice<const L: usize>()
where
    [(); (L - 1) + 1 + L]:,
{
    foo::<_, L>([(); L + 1 + L]);
}

Meta

rustc --version --verbose:

rustc 1.73.0-nightly (0d95f9132 2023-07-26)
binary: rustc
commit-hash: 0d95f9132909ae7c5f2456748d0ffd1c3ba4a8e8
commit-date: 2023-07-26
host: x86_64-unknown-linux-gnu
release: 1.73.0-nightly
LLVM version: 16.0.5

Error output

warning: the feature `generic_const_exprs` is incomplete and may not be safe to use and/or cause compiler crashes
 --> treereduce.out: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[E0601]: `main` function not found in crate `treereduce`
  --> treereduce.out:17:2
   |
17 | }
   |  ^ consider adding a `main` function to `treereduce.out`

error[E0107]: function takes 1 generic argument but 2 generic arguments were supplied
  --> treereduce.out:16:5
   |
16 |     foo::<_, L>([(); L + 1 + L]);
   |     ^^^      - help: remove this generic argument
   |     |
   |     expected 1 generic argument
   |
note: function defined here, with 1 generic parameter: `N`
  --> treereduce.out:3:4
   |
3  | fn foo<const N: usize>(
   |    ^^^ --------------

error[E0308]: mismatched types
  --> treereduce.out:16:18
   |
16 |     foo::<_, L>([(); L + 1 + L]);
   |                  ^^ expected `u8`, found `()`

error: unconstrained generic constant
  --> treereduce.out:16:22
   |
16 |     foo::<_, L>([(); L + 1 + L]);
   |                      ^^^^^^^^^
   |
   = help: try adding a `where` bound using this expression: `where [(); L + 1 + L]:`

error: unconstrained generic constant
  --> treereduce.out:16:17
   |
16 |     foo::<_, L>([(); L + 1 + L]);
   |     ----------- ^^^^^^^^^^^^^^^
   |     |
   |     required by a bound introduced by this call
   |
   = help: try adding a `where` bound using this expression: `where [(); {
                   {
                       N
                   }
               }]:`
note: required by a bound in `foo`
  --> treereduce.out:4:13
   |
3  |   fn foo<const N: usize>(
   |      --- required by a bound in this function
4  |       _: [u8; {
   |  _____________^
5  | |         {
6  | |             N
7  | |         }
8  | |     }],
   | |_____^ required by this bound in `foo`

Backtrace

error: internal compiler error: compiler/rustc_trait_selection/src/traits/error_reporting/mod.rs:3380:21: const evaluatable failed for non-unevaluated const `Const { ty: usize, kind: (Add: Const { ty: usize, kind: (Add: Const { ty: usize, kind: L/#0 }, Const { ty: usize, kind: Leaf(0x0000000000000001) }) }, Const { ty: usize, kind: L/#0 }) }`

thread 'rustc' panicked at 'Box<dyn Any>', /rustc/0d95f9132909ae7c5f2456748d0ffd1c3ba4a8e8/compiler/rustc_errors/src/lib.rs:1640:9
stack backtrace:
   0:     0x7f8872725fc1 - std::backtrace_rs::backtrace::libunwind::trace::hf6e154905f06aaf4
                               at /rustc/0d95f9132909ae7c5f2456748d0ffd1c3ba4a8e8/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7f8872725fc1 - std::backtrace_rs::backtrace::trace_unsynchronized::h18cebe760f1510fa
                               at /rustc/0d95f9132909ae7c5f2456748d0ffd1c3ba4a8e8/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f8872725fc1 - std::sys_common::backtrace::_print_fmt::hffe418505cdd97e8
                               at /rustc/0d95f9132909ae7c5f2456748d0ffd1c3ba4a8e8/library/std/src/sys_common/backtrace.rs:65:5
   3:     0x7f8872725fc1 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h19176839053c7e42
                               at /rustc/0d95f9132909ae7c5f2456748d0ffd1c3ba4a8e8/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f887278c49c - core::fmt::rt::Argument::fmt::hf19c9b9307d45f5d
                               at /rustc/0d95f9132909ae7c5f2456748d0ffd1c3ba4a8e8/library/core/src/fmt/rt.rs:138:9
   5:     0x7f887278c49c - core::fmt::write::h79cbf0496735b1b7
                               at /rustc/0d95f9132909ae7c5f2456748d0ffd1c3ba4a8e8/library/core/src/fmt/mod.rs:1094:21
   6:     0x7f88727185ce - std::io::Write::write_fmt::h11f28dab14e62928
                               at /rustc/0d95f9132909ae7c5f2456748d0ffd1c3ba4a8e8/library/std/src/io/mod.rs:1714:15
   7:     0x7f8872725dd5 - std::sys_common::backtrace::_print::he32b2def77c6f779
                               at /rustc/0d95f9132909ae7c5f2456748d0ffd1c3ba4a8e8/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7f8872725dd5 - std::sys_common::backtrace::print::h6be21ee209c4bf2f
                               at /rustc/0d95f9132909ae7c5f2456748d0ffd1c3ba4a8e8/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7f8872728e2a - std::panicking::panic_hook_with_disk_dump::{{closure}}::h9e13983d414e65b8
                               at /rustc/0d95f9132909ae7c5f2456748d0ffd1c3ba4a8e8/library/std/src/panicking.rs:278:22
  10:     0x7f8872728ac3 - std::panicking::panic_hook_with_disk_dump::he404d3925670a989
                               at /rustc/0d95f9132909ae7c5f2456748d0ffd1c3ba4a8e8/library/std/src/panicking.rs:312:9
  11:     0x7f8871586f79 - rustc_driver_impl[11f9c42ddd32a232]::install_ice_hook::{closure#0}
  12:     0x7f88727296d0 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h8ce3cd052223b94b
                               at /rustc/0d95f9132909ae7c5f2456748d0ffd1c3ba4a8e8/library/alloc/src/boxed.rs:2021:9
  13:     0x7f88727296d0 - std::panicking::rust_panic_with_hook::h1fcb49fe91d725f0
                               at /rustc/0d95f9132909ae7c5f2456748d0ffd1c3ba4a8e8/library/std/src/panicking.rs:733:13
  14:     0x7f8871b53711 - std[2e963e9f253cdd71]::panicking::begin_panic::<rustc_errors[16c9db0e0ca0a6f7]::ExplicitBug>::{closure#0}
  15:     0x7f8871b51396 - std[2e963e9f253cdd71]::sys_common::backtrace::__rust_end_short_backtrace::<std[2e963e9f253cdd71]::panicking::begin_panic<rustc_errors[16c9db0e0ca0a6f7]::ExplicitBug>::{closure#0}, !>
  16:     0x7f8871ac2e96 - std[2e963e9f253cdd71]::panicking::begin_panic::<rustc_errors[16c9db0e0ca0a6f7]::ExplicitBug>
  17:     0x7f8871b6fb24 - <rustc_errors[16c9db0e0ca0a6f7]::HandlerInner>::bug::<alloc[d59d314c1498fc03]::string::String>
  18:     0x7f8871b6f788 - <rustc_errors[16c9db0e0ca0a6f7]::Handler>::bug::<alloc[d59d314c1498fc03]::string::String>
  19:     0x7f8871b6b10c - rustc_middle[2dbe2ef140938139]::util::bug::opt_span_bug_fmt::<rustc_span[6541493927a8eee4]::span_encoding::Span>::{closure#0}
  20:     0x7f8871b69f0a - rustc_middle[2dbe2ef140938139]::ty::context::tls::with_opt::<rustc_middle[2dbe2ef140938139]::util::bug::opt_span_bug_fmt<rustc_span[6541493927a8eee4]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  21:     0x7f8871b69ed8 - rustc_middle[2dbe2ef140938139]::ty::context::tls::with_context_opt::<rustc_middle[2dbe2ef140938139]::ty::context::tls::with_opt<rustc_middle[2dbe2ef140938139]::util::bug::opt_span_bug_fmt<rustc_span[6541493927a8eee4]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  22:     0x7f8870078f90 - rustc_middle[2dbe2ef140938139]::util::bug::bug_fmt
  23:     0x7f8872229e8f - <rustc_infer[d209e7ec2feaa707]::infer::error_reporting::TypeErrCtxt as rustc_trait_selection[29a196fad0f1dedf]::traits::error_reporting::InferCtxtPrivExt>::report_not_const_evaluatable_error
  24:     0x7f8872220617 - <rustc_infer[d209e7ec2feaa707]::infer::error_reporting::TypeErrCtxt as rustc_trait_selection[29a196fad0f1dedf]::traits::error_reporting::TypeErrCtxtExt>::report_selection_error
  25:     0x7f887222c5ab - <rustc_infer[d209e7ec2feaa707]::infer::error_reporting::TypeErrCtxt as rustc_trait_selection[29a196fad0f1dedf]::traits::error_reporting::InferCtxtPrivExt>::report_fulfillment_error
  26:     0x7f887221f15b - <rustc_infer[d209e7ec2feaa707]::infer::error_reporting::TypeErrCtxt as rustc_trait_selection[29a196fad0f1dedf]::traits::error_reporting::TypeErrCtxtExt>::report_fulfillment_errors
  27:     0x7f886f918b23 - <rustc_hir_typeck[dcea5a7d05095b9c]::fn_ctxt::FnCtxt>::check_call
  28:     0x7f886f88287d - <rustc_hir_typeck[dcea5a7d05095b9c]::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
  29:     0x7f886f8c1f67 - <rustc_hir_typeck[dcea5a7d05095b9c]::fn_ctxt::FnCtxt>::check_block_with_expected
  30:     0x7f886f882e15 - <rustc_hir_typeck[dcea5a7d05095b9c]::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
  31:     0x7f887001c6c6 - <rustc_hir_typeck[dcea5a7d05095b9c]::fn_ctxt::FnCtxt>::check_return_expr
  32:     0x7f8870012f6d - rustc_hir_typeck[dcea5a7d05095b9c]::check::check_fn
  33:     0x7f8870001697 - rustc_hir_typeck[dcea5a7d05095b9c]::typeck
  34:     0x7f886f63954e - rustc_query_impl[764276e1d4d25526]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[764276e1d4d25526]::query_impl::typeck::dynamic_query::{closure#2}::{closure#0}, rustc_middle[2dbe2ef140938139]::query::erase::Erased<[u8; 8usize]>>
  35:     0x7f886f63951e - <rustc_query_impl[764276e1d4d25526]::query_impl::typeck::dynamic_query::{closure#2} as core[5cd17d5b9f662bec]::ops::function::FnOnce<(rustc_middle[2dbe2ef140938139]::ty::context::TyCtxt, rustc_span[6541493927a8eee4]::def_id::LocalDefId)>>::call_once
  36:     0x7f886f7a607d - rustc_query_system[455882a7c9f92b0a]::query::plumbing::try_execute_query::<rustc_query_impl[764276e1d4d25526]::DynamicConfig<rustc_query_system[455882a7c9f92b0a]::query::caches::VecCache<rustc_span[6541493927a8eee4]::def_id::LocalDefId, rustc_middle[2dbe2ef140938139]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[764276e1d4d25526]::plumbing::QueryCtxt, false>
  37:     0x7f8870eef6cf - rustc_query_impl[764276e1d4d25526]::query_impl::typeck::get_query_non_incr::__rust_end_short_backtrace
  38:     0x7f8870a24c2d - rustc_data_structures[456d5294c5533e9]::sync::par_for_each_in::<&[rustc_span[6541493927a8eee4]::def_id::LocalDefId], <rustc_middle[2dbe2ef140938139]::hir::map::Map>::par_body_owners<rustc_hir_analysis[7376a6bdbe652c9c]::check_crate::{closure#7}>::{closure#0}>
  39:     0x7f8870a23f0c - rustc_hir_analysis[7376a6bdbe652c9c]::check_crate
  40:     0x7f8870a1de9a - rustc_interface[7f8477932cb20ad4]::passes::analysis
  41:     0x7f8870a8539a - rustc_query_impl[764276e1d4d25526]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[764276e1d4d25526]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[2dbe2ef140938139]::query::erase::Erased<[u8; 1usize]>>
  42:     0x7f8870a85389 - <rustc_query_impl[764276e1d4d25526]::query_impl::analysis::dynamic_query::{closure#2} as core[5cd17d5b9f662bec]::ops::function::FnOnce<(rustc_middle[2dbe2ef140938139]::ty::context::TyCtxt, ())>>::call_once
  43:     0x7f8870c2c818 - rustc_query_system[455882a7c9f92b0a]::query::plumbing::try_execute_query::<rustc_query_impl[764276e1d4d25526]::DynamicConfig<rustc_query_system[455882a7c9f92b0a]::query::caches::SingleCache<rustc_middle[2dbe2ef140938139]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[764276e1d4d25526]::plumbing::QueryCtxt, false>
  44:     0x7f8870c2c5a7 - rustc_query_impl[764276e1d4d25526]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  45:     0x7f88707acad5 - <rustc_middle[2dbe2ef140938139]::ty::context::GlobalCtxt>::enter::<rustc_driver_impl[11f9c42ddd32a232]::run_compiler::{closure#1}::{closure#2}::{closure#4}, core[5cd17d5b9f662bec]::result::Result<(), rustc_span[6541493927a8eee4]::ErrorGuaranteed>>
  46:     0x7f88707ac102 - <rustc_interface[7f8477932cb20ad4]::interface::Compiler>::enter::<rustc_driver_impl[11f9c42ddd32a232]::run_compiler::{closure#1}::{closure#2}, core[5cd17d5b9f662bec]::result::Result<core[5cd17d5b9f662bec]::option::Option<rustc_interface[7f8477932cb20ad4]::queries::Linker>, rustc_span[6541493927a8eee4]::ErrorGuaranteed>>
  47:     0x7f88707a51a8 - std[2e963e9f253cdd71]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[7f8477932cb20ad4]::util::run_in_thread_pool_with_globals<rustc_interface[7f8477932cb20ad4]::interface::run_compiler<core[5cd17d5b9f662bec]::result::Result<(), rustc_span[6541493927a8eee4]::ErrorGuaranteed>, rustc_driver_impl[11f9c42ddd32a232]::run_compiler::{closure#1}>::{closure#0}, core[5cd17d5b9f662bec]::result::Result<(), rustc_span[6541493927a8eee4]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[5cd17d5b9f662bec]::result::Result<(), rustc_span[6541493927a8eee4]::ErrorGuaranteed>>
  48:     0x7f88707a492e - <<std[2e963e9f253cdd71]::thread::Builder>::spawn_unchecked_<rustc_interface[7f8477932cb20ad4]::util::run_in_thread_pool_with_globals<rustc_interface[7f8477932cb20ad4]::interface::run_compiler<core[5cd17d5b9f662bec]::result::Result<(), rustc_span[6541493927a8eee4]::ErrorGuaranteed>, rustc_driver_impl[11f9c42ddd32a232]::run_compiler::{closure#1}>::{closure#0}, core[5cd17d5b9f662bec]::result::Result<(), rustc_span[6541493927a8eee4]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[5cd17d5b9f662bec]::result::Result<(), rustc_span[6541493927a8eee4]::ErrorGuaranteed>>::{closure#1} as core[5cd17d5b9f662bec]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  49:     0x7f8872733dc5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h6a397ffa79ce97be
                               at /rustc/0d95f9132909ae7c5f2456748d0ffd1c3ba4a8e8/library/alloc/src/boxed.rs:2007:9
  50:     0x7f8872733dc5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hd63e3cd46e3d7a48
                               at /rustc/0d95f9132909ae7c5f2456748d0ffd1c3ba4a8e8/library/alloc/src/boxed.rs:2007:9
  51:     0x7f8872733dc5 - std::sys::unix::thread::Thread::new::thread_start::h06e8fe5bf1fac20c
                               at /rustc/0d95f9132909ae7c5f2456748d0ffd1c3ba4a8e8/library/std/src/sys/unix/thread.rs:108:17
  52:     0x7f886e25a44b - <unknown>
  53:     0x7f886e2dde40 - <unknown>
  54:                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: please attach the file at `/tmp/im/rustc-ice-2023-07-27T23:14:40.504323337Z-731981.txt` to your bug report

query stack during panic:
#0 [typeck] type-checking `ice`
#1 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 6 previous errors; 1 warning emitted

Some errors have detailed explanations: E0107, E0308, E0601.
For more information about an error, try `rustc --explain E0107`.

[matthiaskrgr]

Regression in nightly-2022-11-27
commit[0] 2022-11-25: Auto merge of #104902 - matthiaskrgr:rollup-oo27a4u, r=matthiaskrgr
commit[1] 2022-11-25: Auto merge of #99798 - JulianKnodt:ac1, r=BoxyUwU
commit[2] 2022-11-26: Auto merge of #104431 - alistair23:alistair/rv64-profiler, r=Mark-Simulacrum
commit[3] 2022-11-26: Auto merge of #104730 - petrochenkov:modchild5, r=cjgillot
commit[4] 2022-11-26: Auto merge of #103556 - clubby789:specialize-option-partial-eq, r=scottmcm
commit[5] 2022-11-26: Auto merge of #104935 - matthiaskrgr:rollup-nuca86l, r=matthiaskrgr
commit[6] 2022-11-26: Auto merge of #104731 - compiler-errors:early-binder-iter-size-hint, r=cjgillot
commit[7] 2022-11-26: Auto merge of #104945 - GuillaumeGomez:rollup-ygzbpbe, r=GuillaumeGomez

[lenko-d]

@rustbot claim

[oli-obk]

The only thing that looks remotely related is #104835

Either way, be careful about fixing this ICE, it may not suffice to turn it into a nice error, there may be something deeper underlying that we should address.