ICE: `interpret const eval failure of Unevaluated(UnevaluatedConst`

[matthiaskrgr]

latest manually reduced form:

pub struct Data([u8; usize::MAX >> 2]);
const _: &'static [Data] = &[];

auto-reduced (treereduce-rust):

pub struct Data([[[u32; 9999999]; 777777777]; 5_i32]);
const _: &'static Data = unsafe { &*(&[] as *const Data) };

original:

pub struct Data([[[u32; 9999999]; 777777777]; 5_i32]);
const _: &'static Data = unsafe { &*(&[] as *const Data) };

pub fn main() {}

Version information

rustc 1.80.0-nightly (78dd504f2 2024-05-24)
binary: rustc
commit-hash: 78dd504f2fd87c0cfabff7d9174253411caf2f80
commit-date: 2024-05-24
host: x86_64-unknown-linux-gnu
release: 1.80.0-nightly
LLVM version: 18.1.6

Command:
/home/gh-matthiaskrgr/.rustup/toolchains/master/bin/rustc

Program output

error[E0601]: `main` function not found in crate `mvce`
 --> /tmp/icemaker_global_tempdir.QyRvEWiVipgV/rustc_testrunner_tmpdir_reporting.6eRld1crLCV1/mvce.rs:2:60
  |
2 | const _: &'static Data = unsafe { &*(&[] as *const Data) };
  |                                                            ^ consider adding a `main` function to `/tmp/icemaker_global_tempdir.QyRvEWiVipgV/rustc_testrunner_tmpdir_reporting.6eRld1crLCV1/mvce.rs`

error[E0080]: evaluation of constant value failed
 --> /tmp/icemaker_global_tempdir.QyRvEWiVipgV/rustc_testrunner_tmpdir_reporting.6eRld1crLCV1/mvce.rs:2:39
  |
2 | const _: &'static Data = unsafe { &*(&[] as *const Data) };
  |                                       ^^ values of the type `[[u32; 9999999]; 777777777]` are too big for the current architecture

error: internal compiler error: compiler/rustc_const_eval/src/interpret/eval_context.rs:1195:33: interpret const eval failure of Unevaluated(UnevaluatedConst { def: DefId(0:9 ~ mvce[c32c]::_), args: [], promoted: Some(promoted[0]) }, &'{erased} [Data; 0_usize]) which is not in required_consts
 --> /tmp/icemaker_global_tempdir.QyRvEWiVipgV/rustc_testrunner_tmpdir_reporting.6eRld1crLCV1/mvce.rs:2:38
  |
2 | const _: &'static Data = unsafe { &*(&[] as *const Data) };
  |                                      ^^^

thread 'rustc' panicked at compiler/rustc_const_eval/src/interpret/eval_context.rs:1195:33:
Box<dyn Any>
stack backtrace:
   0:     0x7f43c6f8ca25 - std::backtrace_rs::backtrace::libunwind::trace::h8966c752ee3e4366
                               at /rustc/78dd504f2fd87c0cfabff7d9174253411caf2f80/library/std/src/../../backtrace/src/backtrace/libunwind.rs:105:5
   1:     0x7f43c6f8ca25 - std::backtrace_rs::backtrace::trace_unsynchronized::h9ea5b98770d1aa33
                               at /rustc/78dd504f2fd87c0cfabff7d9174253411caf2f80/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f43c6f8ca25 - std::sys_common::backtrace::_print_fmt::he48619da8989a3bf
                               at /rustc/78dd504f2fd87c0cfabff7d9174253411caf2f80/library/std/src/sys_common/backtrace.rs:68:5
   3:     0x7f43c6f8ca25 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h396d8ace60c94a52
                               at /rustc/78dd504f2fd87c0cfabff7d9174253411caf2f80/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f43c6fdbafb - core::fmt::rt::Argument::fmt::h5a43b7685e1a8d8c
                               at /rustc/78dd504f2fd87c0cfabff7d9174253411caf2f80/library/core/src/fmt/rt.rs:165:63
   5:     0x7f43c6fdbafb - core::fmt::write::hb0f90054e0ddacf7
                               at /rustc/78dd504f2fd87c0cfabff7d9174253411caf2f80/library/core/src/fmt/mod.rs:1172:21
   6:     0x7f43c6f8177f - std::io::Write::write_fmt::hd596e75ff8fa0846
                               at /rustc/78dd504f2fd87c0cfabff7d9174253411caf2f80/library/std/src/io/mod.rs:1835:15
   7:     0x7f43c6f8c7fe - std::sys_common::backtrace::_print::h40262024fa5f287e
                               at /rustc/78dd504f2fd87c0cfabff7d9174253411caf2f80/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7f43c6f8c7fe - std::sys_common::backtrace::print::ha7fcd41b8add839e
                               at /rustc/78dd504f2fd87c0cfabff7d9174253411caf2f80/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7f43c6f8f229 - std::panicking::default_hook::{{closure}}::h60e0c4e988d17123
  10:     0x7f43c6f8efca - std::panicking::default_hook::h9ed993c933fab0c2
                               at /rustc/78dd504f2fd87c0cfabff7d9174253411caf2f80/library/std/src/panicking.rs:298:9
  11:     0x7f43ca114110 - std[4869c667286d786e]::panicking::update_hook::<alloc[803fe285b37d8cd0]::boxed::Box<rustc_driver_impl[957f6692bf6a3a58]::install_ice_hook::{closure#0}>>::{closure#0}
  12:     0x7f43c6f8f95b - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::hefe0f5c02c622009
                               at /rustc/78dd504f2fd87c0cfabff7d9174253411caf2f80/library/alloc/src/boxed.rs:2077:9
  13:     0x7f43c6f8f95b - std::panicking::rust_panic_with_hook::h4ddf3c210c6e33af
                               at /rustc/78dd504f2fd87c0cfabff7d9174253411caf2f80/library/std/src/panicking.rs:799:13
  14:     0x7f43ca1448d4 - std[4869c667286d786e]::panicking::begin_panic::<rustc_errors[9393b57c1e89acaf]::ExplicitBug>::{closure#0}
  15:     0x7f43ca1413b6 - std[4869c667286d786e]::sys_common::backtrace::__rust_end_short_backtrace::<std[4869c667286d786e]::panicking::begin_panic<rustc_errors[9393b57c1e89acaf]::ExplicitBug>::{closure#0}, !>
  16:     0x7f43ca13c756 - std[4869c667286d786e]::panicking::begin_panic::<rustc_errors[9393b57c1e89acaf]::ExplicitBug>
  17:     0x7f43ca14dd11 - <rustc_errors[9393b57c1e89acaf]::diagnostic::BugAbort as rustc_errors[9393b57c1e89acaf]::diagnostic::EmissionGuarantee>::emit_producing_guarantee
  18:     0x7f43ca071d78 - <rustc_errors[9393b57c1e89acaf]::DiagCtxt>::span_bug::<rustc_span[6eac4943cc7cd1a3]::span_encoding::Span, alloc[803fe285b37d8cd0]::string::String>
  19:     0x7f43ca0923fd - rustc_middle[34114187831b2967]::util::bug::opt_span_bug_fmt::<rustc_span[6eac4943cc7cd1a3]::span_encoding::Span>::{closure#0}
  20:     0x7f43ca09264a - rustc_middle[34114187831b2967]::ty::context::tls::with_opt::<rustc_middle[34114187831b2967]::util::bug::opt_span_bug_fmt<rustc_span[6eac4943cc7cd1a3]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  21:     0x7f43ca087d6b - rustc_middle[34114187831b2967]::ty::context::tls::with_context_opt::<rustc_middle[34114187831b2967]::ty::context::tls::with_opt<rustc_middle[34114187831b2967]::util::bug::opt_span_bug_fmt<rustc_span[6eac4943cc7cd1a3]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  22:     0x7f43c8c759a7 - rustc_middle[34114187831b2967]::util::bug::span_bug_fmt::<rustc_span[6eac4943cc7cd1a3]::span_encoding::Span>
  23:     0x7f43c9584bfe - <rustc_const_eval[2a16a84a09f3f441]::interpret::eval_context::InterpCx<rustc_const_eval[2a16a84a09f3f441]::const_eval::machine::CompileTimeInterpreter>>::eval_rvalue_into_place
  24:     0x7f43c950408c - rustc_const_eval[2a16a84a09f3f441]::const_eval::eval_queries::eval_to_allocation_raw_provider
  25:     0x7f43cbafa076 - rustc_query_impl[2cb4a958aeb3f22c]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[2cb4a958aeb3f22c]::query_impl::eval_to_allocation_raw::dynamic_query::{closure#2}::{closure#0}, rustc_middle[34114187831b2967]::query::erase::Erased<[u8; 24usize]>>
  26:     0x7f43cbaf9899 - rustc_query_system[5af415981e64bee5]::query::plumbing::try_execute_query::<rustc_query_impl[2cb4a958aeb3f22c]::DynamicConfig<rustc_query_system[5af415981e64bee5]::query::caches::DefaultCache<rustc_middle[34114187831b2967]::ty::ParamEnvAnd<rustc_middle[34114187831b2967]::mir::interpret::GlobalId>, rustc_middle[34114187831b2967]::query::erase::Erased<[u8; 24usize]>>, false, false, false>, rustc_query_impl[2cb4a958aeb3f22c]::plumbing::QueryCtxt, false>
  27:     0x7f43cbaf9470 - rustc_query_impl[2cb4a958aeb3f22c]::query_impl::eval_to_allocation_raw::get_query_non_incr::__rust_end_short_backtrace
  28:     0x7f43cbaf8ff6 - rustc_middle[34114187831b2967]::query::plumbing::query_get_at::<rustc_query_system[5af415981e64bee5]::query::caches::DefaultCache<rustc_middle[34114187831b2967]::ty::ParamEnvAnd<rustc_middle[34114187831b2967]::mir::interpret::GlobalId>, rustc_middle[34114187831b2967]::query::erase::Erased<[u8; 24usize]>>>
  29:     0x7f43cbaf747c - rustc_const_eval[2a16a84a09f3f441]::const_eval::eval_queries::eval_to_const_value_raw_provider
  30:     0x7f43cbaf73f6 - rustc_query_impl[2cb4a958aeb3f22c]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[2cb4a958aeb3f22c]::query_impl::eval_to_const_value_raw::dynamic_query::{closure#2}::{closure#0}, rustc_middle[34114187831b2967]::query::erase::Erased<[u8; 24usize]>>
  31:     0x7f43cbaf985c - rustc_query_system[5af415981e64bee5]::query::plumbing::try_execute_query::<rustc_query_impl[2cb4a958aeb3f22c]::DynamicConfig<rustc_query_system[5af415981e64bee5]::query::caches::DefaultCache<rustc_middle[34114187831b2967]::ty::ParamEnvAnd<rustc_middle[34114187831b2967]::mir::interpret::GlobalId>, rustc_middle[34114187831b2967]::query::erase::Erased<[u8; 24usize]>>, false, false, false>, rustc_query_impl[2cb4a958aeb3f22c]::plumbing::QueryCtxt, false>
  32:     0x7f43cbaf9370 - rustc_query_impl[2cb4a958aeb3f22c]::query_impl::eval_to_const_value_raw::get_query_non_incr::__rust_end_short_backtrace
  33:     0x7f43cb754bdf - <rustc_middle[34114187831b2967]::hir::map::Map>::par_body_owners::<rustc_hir_analysis[513396f821121b45]::check_crate::{closure#3}>::{closure#0}
  34:     0x7f43cb753022 - rustc_hir_analysis[513396f821121b45]::check_crate
  35:     0x7f43cb73323e - rustc_interface[6c4077a70579b4d0]::passes::analysis
  36:     0x7f43cb732d95 - rustc_query_impl[2cb4a958aeb3f22c]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[2cb4a958aeb3f22c]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[34114187831b2967]::query::erase::Erased<[u8; 1usize]>>
  37:     0x7f43cc13a8a5 - rustc_query_system[5af415981e64bee5]::query::plumbing::try_execute_query::<rustc_query_impl[2cb4a958aeb3f22c]::DynamicConfig<rustc_query_system[5af415981e64bee5]::query::caches::SingleCache<rustc_middle[34114187831b2967]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[2cb4a958aeb3f22c]::plumbing::QueryCtxt, false>
  38:     0x7f43cc13a60f - rustc_query_impl[2cb4a958aeb3f22c]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  39:     0x7f43cbfb908e - rustc_interface[6c4077a70579b4d0]::interface::run_compiler::<core[cb4e43784437d8f1]::result::Result<(), rustc_span[6eac4943cc7cd1a3]::ErrorGuaranteed>, rustc_driver_impl[957f6692bf6a3a58]::run_compiler::{closure#0}>::{closure#1}
  40:     0x7f43cbfa4927 - std[4869c667286d786e]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[6c4077a70579b4d0]::util::run_in_thread_with_globals<rustc_interface[6c4077a70579b4d0]::util::run_in_thread_pool_with_globals<rustc_interface[6c4077a70579b4d0]::interface::run_compiler<core[cb4e43784437d8f1]::result::Result<(), rustc_span[6eac4943cc7cd1a3]::ErrorGuaranteed>, rustc_driver_impl[957f6692bf6a3a58]::run_compiler::{closure#0}>::{closure#1}, core[cb4e43784437d8f1]::result::Result<(), rustc_span[6eac4943cc7cd1a3]::ErrorGuaranteed>>::{closure#0}, core[cb4e43784437d8f1]::result::Result<(), rustc_span[6eac4943cc7cd1a3]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[cb4e43784437d8f1]::result::Result<(), rustc_span[6eac4943cc7cd1a3]::ErrorGuaranteed>>
  41:     0x7f43cbfa46ea - <<std[4869c667286d786e]::thread::Builder>::spawn_unchecked_<rustc_interface[6c4077a70579b4d0]::util::run_in_thread_with_globals<rustc_interface[6c4077a70579b4d0]::util::run_in_thread_pool_with_globals<rustc_interface[6c4077a70579b4d0]::interface::run_compiler<core[cb4e43784437d8f1]::result::Result<(), rustc_span[6eac4943cc7cd1a3]::ErrorGuaranteed>, rustc_driver_impl[957f6692bf6a3a58]::run_compiler::{closure#0}>::{closure#1}, core[cb4e43784437d8f1]::result::Result<(), rustc_span[6eac4943cc7cd1a3]::ErrorGuaranteed>>::{closure#0}, core[cb4e43784437d8f1]::result::Result<(), rustc_span[6eac4943cc7cd1a3]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[cb4e43784437d8f1]::result::Result<(), rustc_span[6eac4943cc7cd1a3]::ErrorGuaranteed>>::{closure#2} as core[cb4e43784437d8f1]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  42:     0x7f43c6f9973b - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h496e4fc5fb53ece2
                               at /rustc/78dd504f2fd87c0cfabff7d9174253411caf2f80/library/alloc/src/boxed.rs:2063:9
  43:     0x7f43c6f9973b - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hd4fa5d81a55c123f
                               at /rustc/78dd504f2fd87c0cfabff7d9174253411caf2f80/library/alloc/src/boxed.rs:2063:9
  44:     0x7f43c6f9973b - std::sys::pal::unix::thread::Thread::new::thread_start::h04d31b4f40ca136c
                               at /rustc/78dd504f2fd87c0cfabff7d9174253411caf2f80/library/std/src/sys/pal/unix/thread.rs:108:17
  45:     0x7f43c6c94ac3 - start_thread
                               at ./nptl/pthread_create.c:442:8
  46:     0x7f43c6d26850 - __GI___clone3
                               at ./misc/../sysdeps/unix/sysv/linux/x86_64/clone3.S:81
  47:                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 make sure that you have updated to the latest nightly

note: rustc 1.80.0-nightly (78dd504f2 2024-05-24) running on x86_64-unknown-linux-gnu

query stack during panic:
#0 [eval_to_allocation_raw] const-evaluating + checking `_`
#1 [eval_to_const_value_raw] simplifying constant for the type system `_`
end of query stack
error: aborting due to 3 previous errors

Some errors have detailed explanations: E0080, E0601.
For more information about an error, try `rustc --explain E0080`.

[workingjubilee]

Reduces further:

pub struct Data([u8; usize::MAX >> 16]);
const _: &'static Data = unsafe { &*(&[] as *const Data) };

[workingjubilee]

Further:

pub struct Data([u8; usize::MAX >> 16]);
const _: &'static [Data] = &[];

The slice construction is what matters it seems, this doesn't trigger it:

pub struct Data([u8; usize::MAX >> 16]);
const _: &'static Data = &Data([0; usize::MAX >> 16]);

[oli-obk]

This looks suspiciously like what Ralf hinted at in #124516 (comment)