ICE: `write_immediate_to_mplace: invalid Scalar layout:` with feature `const_mut_refs` and `const_refs_to_static`

[Naserume]

Code

#![feature(const_mut_refs)]
#![feature(const_refs_to_static)]

struct Meh {
    x: &'static dyn UnsafeCell,
}

const MUH: Meh = Meh {
    x: &mut *(READONLY as *mut _),
};

static READONLY: i32 = 0;

trait UnsafeCell<'a> {}

pub fn main() {}

Related Issue

#126666 The origin of seed file before mutation. Line x: &mut *(&READONLY as *const _ as *mut _), mutated to x: &mut *(READONLY as *mut _),
#126272 is also another ICE with similar ice messagewrite_immediate_to_mplace:, but that requires incomplete features

Meta

rustc --version --verbose:

rustc 1.81.0-nightly (6292b2af6 2024-07-02)
binary: rustc
commit-hash: 6292b2af620dbd771ebb687c3a93c69ba8f97268
commit-date: 2024-07-02
host: x86_64-apple-darwin
release: 1.81.0-nightly
LLVM version: 18.1.7

Error output

error[E0106]: missing lifetime specifier
 --> ./126666-1.rs:5:21
  |
5 |     x: &'static dyn UnsafeCell,
  |                     ^^^^^^^^^^ expected named lifetime parameter
  |
  = note: for more information on higher-ranked polymorphism, visit https://doc.rust-lang.org/nomicon/hrtb.html
help: consider making the bound lifetime-generic with a new `'a` lifetime
  |
5 |     x: &'static dyn for<'a> UnsafeCell<'a>,
  |                     +++++++           ++++
help: consider introducing a named lifetime parameter
  |
4 ~ struct Meh<'a> {
5 ~     x: &'static dyn UnsafeCell<'a>,
  |

Backtrace

error: internal compiler error: compiler/rustc_const_eval/src/interpret/place.rs:698:21: write_immediate_to_mplace: invalid Scalar layout: TyAndLayout {
                                    ty: &dyn UnsafeCell<'_>,
                                    layout: Layout {
                                        size: Size(16 bytes),
                                        align: AbiAndPrefAlign {
                                            abi: Align(8 bytes),
                                            pref: Align(8 bytes),
                                        },
                                        abi: ScalarPair(
                                            Initialized {
                                                value: Pointer(
                                                    AddressSpace(
                                                        0,
                                                    ),
                                                ),
                                                valid_range: 1..=18446744073709551615,
                                            },
                                            Initialized {
                                                value: Pointer(
                                                    AddressSpace(
                                                        0,
                                                    ),
                                                ),
                                                valid_range: 1..=18446744073709551615,
                                            },
                                        ),
                                        fields: Arbitrary {
                                            offsets: [
                                                Size(0 bytes),
                                                Size(8 bytes),
                                            ],
                                            memory_index: [
                                                0,
                                                1,
                                            ],
                                        },
                                        largest_niche: Some(
                                            Niche {
                                                offset: Size(0 bytes),
                                                value: Pointer(
                                                    AddressSpace(
                                                        0,
                                                    ),
                                                ),
                                                valid_range: 1..=18446744073709551615,
                                            },
                                        ),
                                        variants: Single {
                                            index: 0,
                                        },
                                        max_repr_align: None,
                                        unadjusted_abi_align: Align(8 bytes),
                                    },
                                }
  --> ./126666-1.rs:8:18
   |
8  |   const MUH: Meh = Meh {
   |  __________________^
9  | |     x: &mut *(READONLY as *mut _),
10 | | };
   | |_^

thread 'rustc' panicked at compiler/rustc_const_eval/src/interpret/place.rs:698:21:
Box<dyn Any>
stack backtrace:
   0:        0x10c0f2d93 - <std::sys::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h9393e218f71d31cf
   1:        0x10c13e17b - core::fmt::write::h1271a75a7bae980c
   2:        0x10c0e8c3e - std::io::Write::write_fmt::h8270e961acbabe61
   3:        0x10c0f2b81 - std::sys::backtrace::print::h04e4916ebe343f6e
   4:        0x10c0f5959 - std::panicking::default_hook::{{closure}}::hc9df26d29e0f9e5a
   5:        0x10c0f56da - std::panicking::default_hook::h1026261fa8b9d0a8
   6:        0x1153dd0ac - std[26270defc80edaa9]::panicking::update_hook::<alloc[98df03226deedbda]::boxed::Box<rustc_driver_impl[708b2ec565622c48]::install_ice_hook::{closure#0}>>::{closure#0}
   7:        0x10c0f6699 - std::panicking::rust_panic_with_hook::hf72d729757d375cc
   8:        0x115451347 - std[26270defc80edaa9]::panicking::begin_panic::<rustc_errors[d689bc684dcf46ea]::ExplicitBug>::{closure#0}
   9:        0x11543d189 - std[26270defc80edaa9]::sys::backtrace::__rust_end_short_backtrace::<std[26270defc80edaa9]::panicking::begin_panic<rustc_errors[d689bc684dcf46ea]::ExplicitBug>::{closure#0}, !>
  10:        0x119e6e199 - std[26270defc80edaa9]::panicking::begin_panic::<rustc_errors[d689bc684dcf46ea]::ExplicitBug>
  11:        0x115463486 - <rustc_errors[d689bc684dcf46ea]::diagnostic::BugAbort as rustc_errors[d689bc684dcf46ea]::diagnostic::EmissionGuarantee>::emit_producing_guarantee
  12:        0x1152774e1 - <rustc_errors[d689bc684dcf46ea]::DiagCtxtHandle>::span_bug::<rustc_span[2de937bbddea0bd8]::span_encoding::Span, alloc[98df03226deedbda]::string::String>
  13:        0x1152a62a8 - rustc_middle[8094f41c293b336b]::util::bug::opt_span_bug_fmt::<rustc_span[2de937bbddea0bd8]::span_encoding::Span>::{closure#0}
  14:        0x1152a72a7 - rustc_middle[8094f41c293b336b]::ty::context::tls::with_opt::<rustc_middle[8094f41c293b336b]::util::bug::opt_span_bug_fmt<rustc_span[2de937bbddea0bd8]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  15:        0x115294155 - rustc_middle[8094f41c293b336b]::ty::context::tls::with_context_opt::<rustc_middle[8094f41c293b336b]::ty::context::tls::with_opt<rustc_middle[8094f41c293b336b]::util::bug::opt_span_bug_fmt<rustc_span[2de937bbddea0bd8]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  16:        0x119e5c672 - rustc_middle[8094f41c293b336b]::util::bug::span_bug_fmt::<rustc_span[2de937bbddea0bd8]::span_encoding::Span>
  17:        0x115342805 - <rustc_const_eval[396cbee6e07433a6]::interpret::eval_context::InterpCx<rustc_const_eval[396cbee6e07433a6]::const_eval::machine::CompileTimeMachine>>::write_immediate_to_mplace_no_validate
  18:        0x1153420e6 - <rustc_const_eval[396cbee6e07433a6]::interpret::eval_context::InterpCx<rustc_const_eval[396cbee6e07433a6]::const_eval::machine::CompileTimeMachine>>::write_immediate_no_validate::<rustc_const_eval[396cbee6e07433a6]::interpret::place::PlaceTy>
  19:        0x1153719ce - <rustc_const_eval[396cbee6e07433a6]::interpret::eval_context::InterpCx<rustc_const_eval[396cbee6e07433a6]::const_eval::machine::CompileTimeMachine>>::copy_op_no_validate::<rustc_const_eval[396cbee6e07433a6]::interpret::operand::OpTy, rustc_const_eval[396cbee6e07433a6]::interpret::place::PlaceTy>
  20:        0x115347955 - <rustc_const_eval[396cbee6e07433a6]::interpret::eval_context::InterpCx<rustc_const_eval[396cbee6e07433a6]::const_eval::machine::CompileTimeMachine>>::statement
  21:        0x115362ed8 - rustc_const_eval[396cbee6e07433a6]::const_eval::eval_queries::eval_to_allocation_raw_provider
  22:        0x116a9aaec - rustc_query_impl[36fa5edae9172c7f]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[36fa5edae9172c7f]::query_impl::eval_to_allocation_raw::dynamic_query::{closure#2}::{closure#0}, rustc_middle[8094f41c293b336b]::query::erase::Erased<[u8; 24usize]>>
  23:        0x116a4fbae - <rustc_query_impl[36fa5edae9172c7f]::query_impl::eval_to_allocation_raw::dynamic_query::{closure#2} as core[c342ec502b95801]::ops::function::FnOnce<(rustc_middle[8094f41c293b336b]::ty::context::TyCtxt, rustc_middle[8094f41c293b336b]::ty::ParamEnvAnd<rustc_middle[8094f41c293b336b]::mir::interpret::GlobalId>)>>::call_once
  24:        0x1168b3c0d - rustc_query_system[16c7cab3586fd5d4]::query::plumbing::try_execute_query::<rustc_query_impl[36fa5edae9172c7f]::DynamicConfig<rustc_query_system[16c7cab3586fd5d4]::query::caches::DefaultCache<rustc_middle[8094f41c293b336b]::ty::ParamEnvAnd<rustc_middle[8094f41c293b336b]::mir::interpret::GlobalId>, rustc_middle[8094f41c293b336b]::query::erase::Erased<[u8; 24usize]>>, false, false, false>, rustc_query_impl[36fa5edae9172c7f]::plumbing::QueryCtxt, false>
  25:        0x116ac59dc - rustc_query_impl[36fa5edae9172c7f]::query_impl::eval_to_allocation_raw::get_query_non_incr::__rust_end_short_backtrace
  26:        0x115293752 - rustc_middle[8094f41c293b336b]::query::plumbing::query_get_at::<rustc_query_system[16c7cab3586fd5d4]::query::caches::DefaultCache<rustc_middle[8094f41c293b336b]::ty::ParamEnvAnd<rustc_middle[8094f41c293b336b]::mir::interpret::GlobalId>, rustc_middle[8094f41c293b336b]::query::erase::Erased<[u8; 24usize]>>>
  27:        0x11535f700 - rustc_const_eval[396cbee6e07433a6]::const_eval::eval_queries::eval_to_const_value_raw_provider
  28:        0x116a9b48c - rustc_query_impl[36fa5edae9172c7f]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[36fa5edae9172c7f]::query_impl::eval_to_const_value_raw::dynamic_query::{closure#2}::{closure#0}, rustc_middle[8094f41c293b336b]::query::erase::Erased<[u8; 24usize]>>
  29:        0x116a5501e - <rustc_query_impl[36fa5edae9172c7f]::query_impl::eval_to_const_value_raw::dynamic_query::{closure#2} as core[c342ec502b95801]::ops::function::FnOnce<(rustc_middle[8094f41c293b336b]::ty::context::TyCtxt, rustc_middle[8094f41c293b336b]::ty::ParamEnvAnd<rustc_middle[8094f41c293b336b]::mir::interpret::GlobalId>)>>::call_once
  30:        0x1168b3c0d - rustc_query_system[16c7cab3586fd5d4]::query::plumbing::try_execute_query::<rustc_query_impl[36fa5edae9172c7f]::DynamicConfig<rustc_query_system[16c7cab3586fd5d4]::query::caches::DefaultCache<rustc_middle[8094f41c293b336b]::ty::ParamEnvAnd<rustc_middle[8094f41c293b336b]::mir::interpret::GlobalId>, rustc_middle[8094f41c293b336b]::query::erase::Erased<[u8; 24usize]>>, false, false, false>, rustc_query_impl[36fa5edae9172c7f]::plumbing::QueryCtxt, false>
  31:        0x116ac628c - rustc_query_impl[36fa5edae9172c7f]::query_impl::eval_to_const_value_raw::get_query_non_incr::__rust_end_short_backtrace
  32:        0x115656e41 - <rustc_middle[8094f41c293b336b]::hir::map::Map>::par_body_owners::<rustc_hir_analysis[af0a509199b1bc4b]::check_crate::{closure#3}>::{closure#0}
  33:        0x1157ac0ec - rustc_hir_analysis[af0a509199b1bc4b]::check_crate
  34:        0x115d53df7 - rustc_interface[eab3c32d3b591e25]::passes::run_required_analyses
  35:        0x115d563a0 - rustc_interface[eab3c32d3b591e25]::passes::analysis
  36:        0x116a9d4ec - rustc_query_impl[36fa5edae9172c7f]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[36fa5edae9172c7f]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[8094f41c293b336b]::query::erase::Erased<[u8; 1usize]>>
  37:        0x11687bfbe - rustc_query_system[16c7cab3586fd5d4]::query::plumbing::try_execute_query::<rustc_query_impl[36fa5edae9172c7f]::DynamicConfig<rustc_query_system[16c7cab3586fd5d4]::query::caches::SingleCache<rustc_middle[8094f41c293b336b]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[36fa5edae9172c7f]::plumbing::QueryCtxt, false>
  38:        0x116aa7a47 - rustc_query_impl[36fa5edae9172c7f]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  39:        0x115386857 - <rustc_interface[eab3c32d3b591e25]::queries::QueryResult<&rustc_middle[8094f41c293b336b]::ty::context::GlobalCtxt>>::enter::<core[c342ec502b95801]::result::Result<(), rustc_span[2de937bbddea0bd8]::ErrorGuaranteed>, rustc_driver_impl[708b2ec565622c48]::run_compiler::{closure#0}::{closure#1}::{closure#5}>
  40:        0x1153e4465 - rustc_interface[eab3c32d3b591e25]::interface::run_compiler::<core[c342ec502b95801]::result::Result<(), rustc_span[2de937bbddea0bd8]::ErrorGuaranteed>, rustc_driver_impl[708b2ec565622c48]::run_compiler::{closure#0}>::{closure#1}
  41:        0x1153caee1 - std[26270defc80edaa9]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[eab3c32d3b591e25]::util::run_in_thread_with_globals<rustc_interface[eab3c32d3b591e25]::util::run_in_thread_pool_with_globals<rustc_interface[eab3c32d3b591e25]::interface::run_compiler<core[c342ec502b95801]::result::Result<(), rustc_span[2de937bbddea0bd8]::ErrorGuaranteed>, rustc_driver_impl[708b2ec565622c48]::run_compiler::{closure#0}>::{closure#1}, core[c342ec502b95801]::result::Result<(), rustc_span[2de937bbddea0bd8]::ErrorGuaranteed>>::{closure#0}, core[c342ec502b95801]::result::Result<(), rustc_span[2de937bbddea0bd8]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[c342ec502b95801]::result::Result<(), rustc_span[2de937bbddea0bd8]::ErrorGuaranteed>>
  42:        0x1153eaff6 - <<std[26270defc80edaa9]::thread::Builder>::spawn_unchecked_<rustc_interface[eab3c32d3b591e25]::util::run_in_thread_with_globals<rustc_interface[eab3c32d3b591e25]::util::run_in_thread_pool_with_globals<rustc_interface[eab3c32d3b591e25]::interface::run_compiler<core[c342ec502b95801]::result::Result<(), rustc_span[2de937bbddea0bd8]::ErrorGuaranteed>, rustc_driver_impl[708b2ec565622c48]::run_compiler::{closure#0}>::{closure#1}, core[c342ec502b95801]::result::Result<(), rustc_span[2de937bbddea0bd8]::ErrorGuaranteed>>::{closure#0}, core[c342ec502b95801]::result::Result<(), rustc_span[2de937bbddea0bd8]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[c342ec502b95801]::result::Result<(), rustc_span[2de937bbddea0bd8]::ErrorGuaranteed>>::{closure#2} as core[c342ec502b95801]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  43:        0x10c0ff83b - std::sys::pal::unix::thread::Thread::new::thread_start::hfcd29f6cc9954faa
  44:     0x7ff801f5318b - __pthread_start

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: please attach the file at `/Users/240701-nightly/rustc-ice-2024-07-03T09_46_03-68509.txt` to your bug report

query stack during panic:
#0 [eval_to_allocation_raw] const-evaluating + checking `MUH`
#1 [eval_to_const_value_raw] simplifying constant for the type system `MUH`
end of query stack
error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0106`.

@rustbot label +F-const_mut_refs +F-const_refs_to_static

[GrigorenkoPV]

searched nightlies: from nightly-2023-04-15 to nightly-2024-07-02
regressed nightly: nightly-2024-03-22
searched commit range: 1388d7a...0ad927c
regressed commit: 6a6cd65
Regression in rust-lang-ci@fa215ae
The PR introducing the regression in this rollup is #122749: make type_flags(ReError) & HAS_ERROR
cc @aliemjay