ICE: `write_immediate_to_mplace: invalid ScalarPair layout: TyAndLayout .. `

[matthiaskrgr]

snippet:

#[repr(C)]

struct MySlice<T: Copy>(bool, T);
type MySliceBool = MySlice<[bool]>;

const MYSLICE_GOOD: &MySliceBool = &MySlice(true, [false]);

Version information

rustc 1.78.0-nightly (f8131a48a 2024-02-21)
binary: rustc
commit-hash: f8131a48a46ac3bc8a3d0fe0477055b132cffdc3
commit-date: 2024-02-21
host: x86_64-unknown-linux-gnu
release: 1.78.0-nightly
LLVM version: 18.1.0

Command:
/home/matthias/.rustup/toolchains/master/bin/rustc

Program output

error[E0601]: `main` function not found in crate `mvce`
 --> /tmp/icemaker_global_tempdir.4OTx4jnqpk6N/rustc_testrunner_tmpdir_reporting.Yb3kuq0TatKu/mvce.rs:6:60
  |
6 | const MYSLICE_GOOD: &MySliceBool = &MySlice(true, [false]);
  |                                                            ^ consider adding a `main` function to `/tmp/icemaker_global_tempdir.4OTx4jnqpk6N/rustc_testrunner_tmpdir_reporting.Yb3kuq0TatKu/mvce.rs`

error[E0277]: the trait bound `[bool]: Copy` is not satisfied
 --> /tmp/icemaker_global_tempdir.4OTx4jnqpk6N/rustc_testrunner_tmpdir_reporting.Yb3kuq0TatKu/mvce.rs:6:22
  |
6 | const MYSLICE_GOOD: &MySliceBool = &MySlice(true, [false]);
  |                      ^^^^^^^^^^^ the trait `Copy` is not implemented for `[bool]`
  |
  = help: the trait `Copy` is implemented for `[T; N]`
note: required by a bound in `MySlice`
 --> /tmp/icemaker_global_tempdir.4OTx4jnqpk6N/rustc_testrunner_tmpdir_reporting.Yb3kuq0TatKu/mvce.rs:3:19
  |
3 | struct MySlice<T: Copy>(bool, T);
  |                   ^^^^ required by this bound in `MySlice`

error: internal compiler error: compiler/rustc_const_eval/src/interpret/place.rs:704:21: write_immediate_to_mplace: invalid ScalarPair layout: TyAndLayout {
                                    ty: &MySlice<[bool]>,
                                    layout: Layout {
                                        size: Size(8 bytes),
                                        align: AbiAndPrefAlign {
                                            abi: Align(8 bytes),
                                            pref: Align(8 bytes),
                                        },
                                        abi: Scalar(
                                            Initialized {
                                                value: Pointer(
                                                    AddressSpace(
                                                        0,
                                                    ),
                                                ),
                                                valid_range: 1..=18446744073709551615,
                                            },
                                        ),
                                        fields: Primitive,
                                        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),
                                    },
                                }
 --> /tmp/icemaker_global_tempdir.4OTx4jnqpk6N/rustc_testrunner_tmpdir_reporting.Yb3kuq0TatKu/mvce.rs:6:1
  |
6 | const MYSLICE_GOOD: &MySliceBool = &MySlice(true, [false]);
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

thread 'rustc' panicked at /rustc/f8131a48a46ac3bc8a3d0fe0477055b132cffdc3/compiler/rustc_middle/src/util/bug.rs:34:50:
Box<dyn Any>
stack backtrace:
   0:     0x7f23895c2af6 - std::backtrace_rs::backtrace::libunwind::trace::hbec2edc838b433e2
                               at /rustc/f8131a48a46ac3bc8a3d0fe0477055b132cffdc3/library/std/src/../../backtrace/src/backtrace/libunwind.rs:104:5
   1:     0x7f23895c2af6 - std::backtrace_rs::backtrace::trace_unsynchronized::h88c30257ee0dd166
                               at /rustc/f8131a48a46ac3bc8a3d0fe0477055b132cffdc3/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f23895c2af6 - std::sys_common::backtrace::_print_fmt::h9176654d509e3088
                               at /rustc/f8131a48a46ac3bc8a3d0fe0477055b132cffdc3/library/std/src/sys_common/backtrace.rs:68:5
   3:     0x7f23895c2af6 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h671feaee1776bf19
                               at /rustc/f8131a48a46ac3bc8a3d0fe0477055b132cffdc3/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f2389613a7c - core::fmt::rt::Argument::fmt::h59605c83ae32d935
                               at /rustc/f8131a48a46ac3bc8a3d0fe0477055b132cffdc3/library/core/src/fmt/rt.rs:142:9
   5:     0x7f2389613a7c - core::fmt::write::hf7af8dfcfd20db5b
                               at /rustc/f8131a48a46ac3bc8a3d0fe0477055b132cffdc3/library/core/src/fmt/mod.rs:1120:17
   6:     0x7f23895b74bf - std::io::Write::write_fmt::h92a5dbf489025e71
                               at /rustc/f8131a48a46ac3bc8a3d0fe0477055b132cffdc3/library/std/src/io/mod.rs:1846:15
   7:     0x7f23895c28a4 - std::sys_common::backtrace::_print::h00080302d23998ae
                               at /rustc/f8131a48a46ac3bc8a3d0fe0477055b132cffdc3/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7f23895c28a4 - std::sys_common::backtrace::print::h6b23124445400245
                               at /rustc/f8131a48a46ac3bc8a3d0fe0477055b132cffdc3/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7f23895c55eb - std::panicking::default_hook::{{closure}}::hd67b2f9d36675a28
  10:     0x7f23895c5339 - std::panicking::default_hook::h10a39ef11c714e42
                               at /rustc/f8131a48a46ac3bc8a3d0fe0477055b132cffdc3/library/std/src/panicking.rs:292:9
  11:     0x7f238627a94c - std[5a8e7f94216a9138]::panicking::update_hook::<alloc[e14ab1f516d287ab]::boxed::Box<rustc_driver_impl[e279e4f1fedd9109]::install_ice_hook::{closure#0}>>::{closure#0}
  12:     0x7f23895c5d50 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h37ba37dc48823c1d
                               at /rustc/f8131a48a46ac3bc8a3d0fe0477055b132cffdc3/library/alloc/src/boxed.rs:2030:9
  13:     0x7f23895c5d50 - std::panicking::rust_panic_with_hook::he3e3bc7c345bf54b
                               at /rustc/f8131a48a46ac3bc8a3d0fe0477055b132cffdc3/library/std/src/panicking.rs:786:13
  14:     0x7f23862a7524 - std[5a8e7f94216a9138]::panicking::begin_panic::<rustc_errors[34364e5c712fab73]::ExplicitBug>::{closure#0}
  15:     0x7f23862a4176 - std[5a8e7f94216a9138]::sys_common::backtrace::__rust_end_short_backtrace::<std[5a8e7f94216a9138]::panicking::begin_panic<rustc_errors[34364e5c712fab73]::ExplicitBug>::{closure#0}, !>
  16:     0x7f238629f936 - std[5a8e7f94216a9138]::panicking::begin_panic::<rustc_errors[34364e5c712fab73]::ExplicitBug>
  17:     0x7f2384c17631 - <rustc_errors[34364e5c712fab73]::diagnostic::BugAbort as rustc_errors[34364e5c712fab73]::diagnostic::EmissionGuarantee>::emit_producing_guarantee
  18:     0x7f2386201f60 - rustc_middle[446dd094ad85939e]::util::bug::opt_span_bug_fmt::<rustc_span[adb133ac03280fc1]::span_encoding::Span>::{closure#0}
  19:     0x7f238620217a - rustc_middle[446dd094ad85939e]::ty::context::tls::with_opt::<rustc_middle[446dd094ad85939e]::util::bug::opt_span_bug_fmt<rustc_span[adb133ac03280fc1]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  20:     0x7f23861f8e48 - rustc_middle[446dd094ad85939e]::ty::context::tls::with_context_opt::<rustc_middle[446dd094ad85939e]::ty::context::tls::with_opt<rustc_middle[446dd094ad85939e]::util::bug::opt_span_bug_fmt<rustc_span[adb133ac03280fc1]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  21:     0x7f2385850f54 - rustc_middle[446dd094ad85939e]::util::bug::span_bug_fmt::<rustc_span[adb133ac03280fc1]::span_encoding::Span>
  22:     0x7f23876e3e85 - <rustc_const_eval[b7e9a6566b8f5ff6]::interpret::eval_context::InterpCx<rustc_const_eval[b7e9a6566b8f5ff6]::const_eval::machine::CompileTimeInterpreter>>::write_immediate_no_validate::<rustc_const_eval[b7e9a6566b8f5ff6]::interpret::place::PlaceTy>
  23:     0x7f23879ff729 - <rustc_const_eval[b7e9a6566b8f5ff6]::interpret::eval_context::InterpCx<rustc_const_eval[b7e9a6566b8f5ff6]::const_eval::machine::CompileTimeInterpreter>>::pop_stack_frame
  24:     0x7f2388482b8e - rustc_const_eval[b7e9a6566b8f5ff6]::const_eval::eval_queries::eval_body_using_ecx::{closure#0}
  25:     0x7f2388476f23 - rustc_const_eval[b7e9a6566b8f5ff6]::const_eval::eval_queries::eval_in_interpreter
  26:     0x7f23879fa938 - rustc_const_eval[b7e9a6566b8f5ff6]::const_eval::eval_queries::eval_to_allocation_raw_provider
  27:     0x7f23879fa706 - rustc_query_impl[9d4c51777e2bb749]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[9d4c51777e2bb749]::query_impl::eval_to_allocation_raw::dynamic_query::{closure#2}::{closure#0}, rustc_middle[446dd094ad85939e]::query::erase::Erased<[u8; 24usize]>>
  28:     0x7f238800ba51 - rustc_query_system[9b2ccfe41ae3bb1b]::query::plumbing::try_execute_query::<rustc_query_impl[9d4c51777e2bb749]::DynamicConfig<rustc_query_system[9b2ccfe41ae3bb1b]::query::caches::DefaultCache<rustc_middle[446dd094ad85939e]::ty::ParamEnvAnd<rustc_middle[446dd094ad85939e]::mir::interpret::GlobalId>, rustc_middle[446dd094ad85939e]::query::erase::Erased<[u8; 24usize]>>, false, false, false>, rustc_query_impl[9d4c51777e2bb749]::plumbing::QueryCtxt, false>
  29:     0x7f238800b62c - rustc_query_impl[9d4c51777e2bb749]::query_impl::eval_to_allocation_raw::get_query_non_incr::__rust_end_short_backtrace
  30:     0x7f23879fb60d - rustc_const_eval[b7e9a6566b8f5ff6]::const_eval::eval_queries::eval_to_const_value_raw_provider
  31:     0x7f23879fb40c - rustc_query_impl[9d4c51777e2bb749]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[9d4c51777e2bb749]::query_impl::eval_to_const_value_raw::dynamic_query::{closure#2}::{closure#0}, rustc_middle[446dd094ad85939e]::query::erase::Erased<[u8; 24usize]>>
  32:     0x7f238800ba14 - rustc_query_system[9b2ccfe41ae3bb1b]::query::plumbing::try_execute_query::<rustc_query_impl[9d4c51777e2bb749]::DynamicConfig<rustc_query_system[9b2ccfe41ae3bb1b]::query::caches::DefaultCache<rustc_middle[446dd094ad85939e]::ty::ParamEnvAnd<rustc_middle[446dd094ad85939e]::mir::interpret::GlobalId>, rustc_middle[446dd094ad85939e]::query::erase::Erased<[u8; 24usize]>>, false, false, false>, rustc_query_impl[9d4c51777e2bb749]::plumbing::QueryCtxt, false>
  33:     0x7f238800b530 - rustc_query_impl[9d4c51777e2bb749]::query_impl::eval_to_const_value_raw::get_query_non_incr::__rust_end_short_backtrace
  34:     0x7f2387fafe6b - <rustc_middle[446dd094ad85939e]::query::plumbing::TyCtxtEnsure>::const_eval_poly
  35:     0x7f2387fadbd3 - rustc_hir_analysis[71d4294717f7f2b7]::check_crate
  36:     0x7f23880a2dd3 - rustc_interface[7ca501d7f8f3a34f]::passes::analysis
  37:     0x7f23880a2a29 - rustc_query_impl[9d4c51777e2bb749]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[9d4c51777e2bb749]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[446dd094ad85939e]::query::erase::Erased<[u8; 1usize]>>
  38:     0x7f238833d4a5 - rustc_query_system[9b2ccfe41ae3bb1b]::query::plumbing::try_execute_query::<rustc_query_impl[9d4c51777e2bb749]::DynamicConfig<rustc_query_system[9b2ccfe41ae3bb1b]::query::caches::SingleCache<rustc_middle[446dd094ad85939e]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[9d4c51777e2bb749]::plumbing::QueryCtxt, false>
  39:     0x7f238833d209 - rustc_query_impl[9d4c51777e2bb749]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  40:     0x7f238834c719 - rustc_interface[7ca501d7f8f3a34f]::interface::run_compiler::<core[85b4fd477ce5bb21]::result::Result<(), rustc_span[adb133ac03280fc1]::ErrorGuaranteed>, rustc_driver_impl[e279e4f1fedd9109]::run_compiler::{closure#0}>::{closure#0}
  41:     0x7f23885be705 - std[5a8e7f94216a9138]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[7ca501d7f8f3a34f]::util::run_in_thread_with_globals<rustc_interface[7ca501d7f8f3a34f]::util::run_in_thread_pool_with_globals<rustc_interface[7ca501d7f8f3a34f]::interface::run_compiler<core[85b4fd477ce5bb21]::result::Result<(), rustc_span[adb133ac03280fc1]::ErrorGuaranteed>, rustc_driver_impl[e279e4f1fedd9109]::run_compiler::{closure#0}>::{closure#0}, core[85b4fd477ce5bb21]::result::Result<(), rustc_span[adb133ac03280fc1]::ErrorGuaranteed>>::{closure#0}, core[85b4fd477ce5bb21]::result::Result<(), rustc_span[adb133ac03280fc1]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[85b4fd477ce5bb21]::result::Result<(), rustc_span[adb133ac03280fc1]::ErrorGuaranteed>>
  42:     0x7f23885be532 - <<std[5a8e7f94216a9138]::thread::Builder>::spawn_unchecked_<rustc_interface[7ca501d7f8f3a34f]::util::run_in_thread_with_globals<rustc_interface[7ca501d7f8f3a34f]::util::run_in_thread_pool_with_globals<rustc_interface[7ca501d7f8f3a34f]::interface::run_compiler<core[85b4fd477ce5bb21]::result::Result<(), rustc_span[adb133ac03280fc1]::ErrorGuaranteed>, rustc_driver_impl[e279e4f1fedd9109]::run_compiler::{closure#0}>::{closure#0}, core[85b4fd477ce5bb21]::result::Result<(), rustc_span[adb133ac03280fc1]::ErrorGuaranteed>>::{closure#0}, core[85b4fd477ce5bb21]::result::Result<(), rustc_span[adb133ac03280fc1]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[85b4fd477ce5bb21]::result::Result<(), rustc_span[adb133ac03280fc1]::ErrorGuaranteed>>::{closure#1} as core[85b4fd477ce5bb21]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  43:     0x7f23895cf725 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h1bff3efb61c3fa6b
                               at /rustc/f8131a48a46ac3bc8a3d0fe0477055b132cffdc3/library/alloc/src/boxed.rs:2016:9
  44:     0x7f23895cf725 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h83141cf549dced8a
                               at /rustc/f8131a48a46ac3bc8a3d0fe0477055b132cffdc3/library/alloc/src/boxed.rs:2016:9
  45:     0x7f23895cf725 - std::sys::pal::unix::thread::Thread::new::thread_start::hbe9287fdd7c325bc
                               at /rustc/f8131a48a46ac3bc8a3d0fe0477055b132cffdc3/library/std/src/sys/pal/unix/thread.rs:108:17
  46:     0x7f23832749eb - <unknown>
  47:     0x7f23832f87cc - <unknown>
  48:                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 1.78.0-nightly (f8131a48a 2024-02-21) running on x86_64-unknown-linux-gnu

query stack during panic:
#0 [eval_to_allocation_raw] const-evaluating + checking `MYSLICE_GOOD`
#1 [eval_to_const_value_raw] simplifying constant for the type system `MYSLICE_GOOD`
#2 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 3 previous errors

Some errors have detailed explanations: E0277, E0601.
For more information about an error, try `rustc --explain E0277`.

[matthiaskrgr]

#121087 cc @oli-obk