ICE with dyn* when trait is implemented for union

[lukas-code]

Code

playground

#![feature(dyn_star)]

union Union {
    x: usize,
}

trait Trait {}
impl Trait for Union {}

fn bar(_: dyn* Trait) {}

fn main() {
    bar(Union { x: 0usize });
}

In particular, this also happens with MaybeUninit.

Meta

rustc --version --verbose:

1.77.0-nightly (2024-01-06 b6a8c762eed0ae038365)

Error output

error: internal compiler error: /rustc/b6a8c762eed0ae0383658c38d65cb91bbd9800a1/compiler/rustc_const_eval/src/interpret/operand.rs:558:13: primitive read not possible for type: Union
  --> src/main.rs:13:9
   |
13 |     bar(Union { x: 0usize });
   |         ^^^^^^^^^^^^^^^^^^^

Backtrace

   0:     0x7f7d60031806 - std::backtrace_rs::backtrace::libunwind::trace::hc8af34b4fd5a864a
                               at /rustc/b6a8c762eed0ae0383658c38d65cb91bbd9800a1/library/std/src/../../backtrace/src/backtrace/libunwind.rs:104:5
   1:     0x7f7d60031806 - std::backtrace_rs::backtrace::trace_unsynchronized::h18f53d63ca623615
                               at /rustc/b6a8c762eed0ae0383658c38d65cb91bbd9800a1/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f7d60031806 - std::sys_common::backtrace::_print_fmt::h943cd7e21aafa33c
                               at /rustc/b6a8c762eed0ae0383658c38d65cb91bbd9800a1/library/std/src/sys_common/backtrace.rs:68:5
   3:     0x7f7d60031806 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h635232b34a35adaf
                               at /rustc/b6a8c762eed0ae0383658c38d65cb91bbd9800a1/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f7d60083f00 - core::fmt::rt::Argument::fmt::h50bc38c8fd18fbd6
                               at /rustc/b6a8c762eed0ae0383658c38d65cb91bbd9800a1/library/core/src/fmt/rt.rs:142:9
   5:     0x7f7d60083f00 - core::fmt::write::hcbf70025ea05925d
                               at /rustc/b6a8c762eed0ae0383658c38d65cb91bbd9800a1/library/core/src/fmt/mod.rs:1120:17
   6:     0x7f7d600251ef - std::io::Write::write_fmt::hcbf632fb6405bb22
                               at /rustc/b6a8c762eed0ae0383658c38d65cb91bbd9800a1/library/std/src/io/mod.rs:1810:15
   7:     0x7f7d600315e4 - std::sys_common::backtrace::_print::h8eaf13ff4bc3f56c
                               at /rustc/b6a8c762eed0ae0383658c38d65cb91bbd9800a1/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7f7d600315e4 - std::sys_common::backtrace::print::hd6c89746850dfcd6
                               at /rustc/b6a8c762eed0ae0383658c38d65cb91bbd9800a1/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7f7d60034377 - std::panicking::default_hook::{{closure}}::h83e3c0fe3d256343
  10:     0x7f7d600340d9 - std::panicking::default_hook::h69b664a5f52034de
                               at /rustc/b6a8c762eed0ae0383658c38d65cb91bbd9800a1/library/std/src/panicking.rs:292:9
  11:     0x7f7d62df75fc - std[c932748c3b80640d]::panicking::update_hook::<alloc[f261ea4c0f85c6bb]::boxed::Box<rustc_driver_impl[ebb25202c4ed59f0]::install_ice_hook::{closure#0}>>::{closure#0}
  12:     0x7f7d60034ac6 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h09c6ccfd38800816
                               at /rustc/b6a8c762eed0ae0383658c38d65cb91bbd9800a1/library/alloc/src/boxed.rs:2030:9
  13:     0x7f7d60034ac6 - std::panicking::rust_panic_with_hook::h40f93821e565b644
                               at /rustc/b6a8c762eed0ae0383658c38d65cb91bbd9800a1/library/std/src/panicking.rs:783:13
  14:     0x7f7d60034812 - std::panicking::begin_panic_handler::{{closure}}::h7a8c3b740409c5db
                               at /rustc/b6a8c762eed0ae0383658c38d65cb91bbd9800a1/library/std/src/panicking.rs:657:13
  15:     0x7f7d60031d06 - std::sys_common::backtrace::__rust_end_short_backtrace::hfcad91b8b8bca0cb
                               at /rustc/b6a8c762eed0ae0383658c38d65cb91bbd9800a1/library/std/src/sys_common/backtrace.rs:171:18
  16:     0x7f7d60034570 - rust_begin_unwind
                               at /rustc/b6a8c762eed0ae0383658c38d65cb91bbd9800a1/library/std/src/panicking.rs:645:5
  17:     0x7f7d60080605 - core::panicking::panic_fmt::h7980b100f8a83e2f
                               at /rustc/b6a8c762eed0ae0383658c38d65cb91bbd9800a1/library/core/src/panicking.rs:72:14
  18:     0x7f7d600803b3 - core::panicking::panic_display::h486cf5019caa64c4
                               at /rustc/b6a8c762eed0ae0383658c38d65cb91bbd9800a1/library/core/src/panicking.rs:196:5
  19:     0x7f7d600803b3 - core::panicking::panic_str::ha87d3ebeb6510906
                               at /rustc/b6a8c762eed0ae0383658c38d65cb91bbd9800a1/library/core/src/panicking.rs:171:5
  20:     0x7f7d600803b3 - core::option::expect_failed::hede16d39fbffda37
                               at /rustc/b6a8c762eed0ae0383658c38d65cb91bbd9800a1/library/core/src/option.rs:1980:5
  21:     0x7f7d648b9838 - <core[b0f7c3f66f4f9544]::iter::adapters::enumerate::Enumerate<_> as core[b0f7c3f66f4f9544]::iter::traits::iterator::Iterator>::try_fold::enumerate::<rustc_middle[5c0e933253c36f]::ty::Ty, (), core[b0f7c3f66f4f9544]::ops::control_flow::ControlFlow<core[b0f7c3f66f4f9544]::ops::control_flow::ControlFlow<rustc_target[5a1d4082f1b1a00c]::abi::call::ArgAbi<rustc_middle[5c0e933253c36f]::ty::Ty>>>, core[b0f7c3f66f4f9544]::iter::adapters::map::map_try_fold<(usize, rustc_middle[5c0e933253c36f]::ty::Ty), core[b0f7c3f66f4f9544]::result::Result<rustc_target[5a1d4082f1b1a00c]::abi::call::ArgAbi<rustc_middle[5c0e933253c36f]::ty::Ty>, &rustc_middle[5c0e933253c36f]::ty::layout::FnAbiError>, (), core[b0f7c3f66f4f9544]::ops::control_flow::ControlFlow<core[b0f7c3f66f4f9544]::ops::control_flow::ControlFlow<rustc_target[5a1d4082f1b1a00c]::abi::call::ArgAbi<rustc_middle[5c0e933253c36f]::ty::Ty>>>, rustc_ty_utils[7ccf7f6b7af95c81]::abi::fn_abi_new_uncached::{closure#1}, <core[b0f7c3f66f4f9544]::iter::adapters::GenericShunt<core[b0f7c3f66f4f9544]::iter::adapters::map::Map<core[b0f7c3f66f4f9544]::iter::adapters::enumerate::Enumerate<core[b0f7c3f66f4f9544]::iter::adapters::chain::Chain<core[b0f7c3f66f4f9544]::iter::adapters::chain::Chain<core[b0f7c3f66f4f9544]::iter::adapters::copied::Copied<core[b0f7c3f66f4f9544]::slice::iter::Iter<rustc_middle[5c0e933253c36f]::ty::Ty>>, core[b0f7c3f66f4f9544]::iter::adapters::copied::Copied<core[b0f7c3f66f4f9544]::slice::iter::Iter<rustc_middle[5c0e933253c36f]::ty::Ty>>>, core[b0f7c3f66f4f9544]::option::IntoIter<rustc_middle[5c0e933253c36f]::ty::Ty>>>, rustc_ty_utils[7ccf7f6b7af95c81]::abi::fn_abi_new_uncached::{closure#1}>, core[b0f7c3f66f4f9544]::result::Result<core[b0f7c3f66f4f9544]::convert::Infallible, &rustc_middle[5c0e933253c36f]::ty::layout::FnAbiError>> as core[b0f7c3f66f4f9544]::iter::traits::iterator::Iterator>::try_fold<(), core[b0f7c3f66f4f9544]::iter::traits::iterator::Iterator::try_for_each::call<rustc_target[5a1d4082f1b1a00c]::abi::call::ArgAbi<rustc_middle[5c0e933253c36f]::ty::Ty>, core[b0f7c3f66f4f9544]::ops::control_flow::ControlFlow<rustc_target[5a1d4082f1b1a00c]::abi::call::ArgAbi<rustc_middle[5c0e933253c36f]::ty::Ty>>, core[b0f7c3f66f4f9544]::ops::control_flow::ControlFlow<rustc_target[5a1d4082f1b1a00c]::abi::call::ArgAbi<rustc_middle[5c0e933253c36f]::ty::Ty>>::Break>::{closure#0}, core[b0f7c3f66f4f9544]::ops::control_flow::ControlFlow<rustc_target[5a1d4082f1b1a00c]::abi::call::ArgAbi<rustc_middle[5c0e933253c36f]::ty::Ty>>>::{closure#0}>::{closure#0}>::{closure#0}
  22:     0x7f7d64a57f6d - rustc_ty_utils[7ccf7f6b7af95c81]::abi::fn_abi_new_uncached
  23:     0x7f7d64a54714 - rustc_ty_utils[7ccf7f6b7af95c81]::abi::fn_abi_of_instance
  24:     0x7f7d64a52fb3 - rustc_query_impl[8d51d83533aab555]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[8d51d83533aab555]::query_impl::fn_abi_of_instance::dynamic_query::{closure#2}::{closure#0}, rustc_middle[5c0e933253c36f]::query::erase::Erased<[u8; 16usize]>>
  25:     0x7f7d64a51dae - rustc_query_system[467b12522657033b]::query::plumbing::try_execute_query::<rustc_query_impl[8d51d83533aab555]::DynamicConfig<rustc_query_system[467b12522657033b]::query::caches::DefaultCache<rustc_middle[5c0e933253c36f]::ty::ParamEnvAnd<(rustc_middle[5c0e933253c36f]::ty::instance::Instance, &rustc_middle[5c0e933253c36f]::ty::list::List<rustc_middle[5c0e933253c36f]::ty::Ty>)>, rustc_middle[5c0e933253c36f]::query::erase::Erased<[u8; 16usize]>>, false, false, false>, rustc_query_impl[8d51d83533aab555]::plumbing::QueryCtxt, false>
  26:     0x7f7d64a519bd - rustc_query_impl[8d51d83533aab555]::query_impl::fn_abi_of_instance::get_query_non_incr::__rust_end_short_backtrace
  27:     0x7f7d64898c6f - <rustc_codegen_ssa[f9144df516ab017b]::mir::FunctionCx<rustc_codegen_llvm[520b98953a3fa16a]::builder::Builder>>::codegen_block
  28:     0x7f7d64c4288f - rustc_codegen_ssa[f9144df516ab017b]::mir::codegen_mir::<rustc_codegen_llvm[520b98953a3fa16a]::builder::Builder>
  29:     0x7f7d64c3008d - rustc_codegen_llvm[520b98953a3fa16a]::base::compile_codegen_unit::module_codegen
  30:     0x7f7d6504866b - <rustc_codegen_llvm[520b98953a3fa16a]::LlvmCodegenBackend as rustc_codegen_ssa[f9144df516ab017b]::traits::backend::ExtraBackendMethods>::compile_codegen_unit
  31:     0x7f7d65058fe8 - rustc_codegen_ssa[f9144df516ab017b]::base::codegen_crate::<rustc_codegen_llvm[520b98953a3fa16a]::LlvmCodegenBackend>
  32:     0x7f7d6505877f - <rustc_codegen_llvm[520b98953a3fa16a]::LlvmCodegenBackend as rustc_codegen_ssa[f9144df516ab017b]::traits::backend::CodegenBackend>::codegen_crate
  33:     0x7f7d65056b2c - rustc_interface[b64d2c573b6a40ef]::passes::start_codegen
  34:     0x7f7d650562a8 - <rustc_interface[b64d2c573b6a40ef]::queries::Queries>::codegen_and_build_linker
  35:     0x7f7d64e9ebce - rustc_interface[b64d2c573b6a40ef]::interface::run_compiler::<core[b0f7c3f66f4f9544]::result::Result<(), rustc_span[7608ec07a6279d6f]::ErrorGuaranteed>, rustc_driver_impl[ebb25202c4ed59f0]::run_compiler::{closure#0}>::{closure#0}
  36:     0x7f7d65082286 - std[c932748c3b80640d]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[b64d2c573b6a40ef]::util::run_in_thread_with_globals<rustc_interface[b64d2c573b6a40ef]::util::run_in_thread_pool_with_globals<rustc_interface[b64d2c573b6a40ef]::interface::run_compiler<core[b0f7c3f66f4f9544]::result::Result<(), rustc_span[7608ec07a6279d6f]::ErrorGuaranteed>, rustc_driver_impl[ebb25202c4ed59f0]::run_compiler::{closure#0}>::{closure#0}, core[b0f7c3f66f4f9544]::result::Result<(), rustc_span[7608ec07a6279d6f]::ErrorGuaranteed>>::{closure#0}, core[b0f7c3f66f4f9544]::result::Result<(), rustc_span[7608ec07a6279d6f]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[b0f7c3f66f4f9544]::result::Result<(), rustc_span[7608ec07a6279d6f]::ErrorGuaranteed>>
  37:     0x7f7d650820b3 - <<std[c932748c3b80640d]::thread::Builder>::spawn_unchecked_<rustc_interface[b64d2c573b6a40ef]::util::run_in_thread_with_globals<rustc_interface[b64d2c573b6a40ef]::util::run_in_thread_pool_with_globals<rustc_interface[b64d2c573b6a40ef]::interface::run_compiler<core[b0f7c3f66f4f9544]::result::Result<(), rustc_span[7608ec07a6279d6f]::ErrorGuaranteed>, rustc_driver_impl[ebb25202c4ed59f0]::run_compiler::{closure#0}>::{closure#0}, core[b0f7c3f66f4f9544]::result::Result<(), rustc_span[7608ec07a6279d6f]::ErrorGuaranteed>>::{closure#0}, core[b0f7c3f66f4f9544]::result::Result<(), rustc_span[7608ec07a6279d6f]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[b0f7c3f66f4f9544]::result::Result<(), rustc_span[7608ec07a6279d6f]::ErrorGuaranteed>>::{closure#1} as core[b0f7c3f66f4f9544]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  38:     0x7f7d6003e9f5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h41ef687adb0ae1b6
                               at /rustc/b6a8c762eed0ae0383658c38d65cb91bbd9800a1/library/alloc/src/boxed.rs:2016:9
  39:     0x7f7d6003e9f5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h8a30a6ac67169adc
                               at /rustc/b6a8c762eed0ae0383658c38d65cb91bbd9800a1/library/alloc/src/boxed.rs:2016:9
  40:     0x7f7d6003e9f5 - std::sys::unix::thread::Thread::new::thread_start::h8dea3c4d6d74e810
                               at /rustc/b6a8c762eed0ae0383658c38d65cb91bbd9800a1/library/std/src/sys/unix/thread.rs:108:17
  41:     0x7f7d5ff51609 - start_thread
  42:     0x7f7d5fe74353 - clone
  43:                0x0 - <unknown>

@rustbot label F-dyn_star requires-nightly

[matthiaskrgr]

Regression in nightly-2022-10-16
found 7 bors merge commits in the specified range
commit[0] 2022-10-14: Auto merge of #101030 - woppopo:const_location, r=scottmcm
commit[1] 2022-10-14: Auto merge of #103069 - matthiaskrgr:rollup-xxsx6sk, r=matthiaskrgr
commit[2] 2022-10-15: Auto merge of #98033 - joshtriplett:is-terminal-fd-handle, r=thomcc
commit[3] 2022-10-15: Auto merge of #99292 - Aaron1011:stability-use-tree, r=cjgillot
commit[4] 2022-10-15: Auto merge of #101832 - compiler-errors:dyn-star-plus, r=eholk
commit[5] 2022-10-15: Auto merge of #103083 - Dylan-DPC:rollup-97cvwdv, r=Dylan-DPC
commit[6] 2022-10-15: Auto merge of #102895 - Nilstrieb:query-cleanups, r=cjgillot
ERROR: no CI builds available between bf15a9e and b8c35ca within last 167 days

maybe #101832 ?