`OperandValue cannot be a pointer:` Ref(PlaceValue

[Naserume]

Code

#![feature(unsize, coerce_unsized)]

use std::{
    ops::CoerceUnsized,
    marker::Unsize,
};

#[repr(C)]
struct Ptr<T: ?Sized>(Box<T>);

impl<T: ?Send, U: ?Sized> CoerceUnsized<Ptr<U>> for Ptr<T>
where
    T: Unsize<U>,
{}


fn main() {
    let foo = Ptr(Box::new(5)) as Ptr<::std::any::Any>;
}

Meta

rustc --version --verbose:

rustc 1.80.0-nightly (ab14f944a 2024-05-13)
binary: rustc
commit-hash: ab14f944afe4234db378ced3801e637eae6c0f30
commit-date: 2024-05-13
host: x86_64-apple-darwin
release: 1.80.0-nightly
LLVM version: 18.1.4

Error output

warning: relaxing a default bound only does something for `?Sized`; all other traits are not bound by default
  --> ./B44319F5AA8002E03AC4912FAF44101E5F5D591247689092F2E8F2F8396BAD52.rs:11:9
   |
11 | impl<T: ?Send, U: ?Sized> CoerceUnsized<Ptr<U>> for Ptr<T>
   |         ^^^^^

warning: trait objects without an explicit `dyn` are deprecated
  --> ./B44319F5AA8002E03AC4912FAF44101E5F5D591247689092F2E8F2F8396BAD52.rs:18:39
   |
18 |     let foo = Ptr(Box::new(5)) as Ptr<::std::any::Any>;
   |                                       ^^^^^^^^^^^^^^^
   |
   = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
   = note: `#[warn(bare_trait_objects)]` on by default
help: if this is an object-safe trait, use `dyn`
   |
18 |     let foo = Ptr(Box::new(5)) as Ptr<dyn (::std::any::Any)>;
   |                                       +++++               +

warning: unused variable: `foo`
  --> ./B44319F5AA8002E03AC4912FAF44101E5F5D591247689092F2E8F2F8396BAD52.rs:18:9
   |
18 |     let foo = Ptr(Box::new(5)) as Ptr<::std::any::Any>;
   |         ^^^ help: if this is intentional, prefix it with an underscore: `_foo`
   |
   = note: `#[warn(unused_variables)]` on by default

Backtrace

error: internal compiler error: /rustc/ab14f944afe4234db378ced3801e637eae6c0f30/compiler/rustc_codegen_ssa/src/mir/operand.rs:98:18: OperandValue cannot be a pointer: Ref(PlaceValue { llval: (ptr:  %1 = alloca [8 x i8], align 8), llextra: None, align: Align(8 bytes) })

thread 'rustc' panicked at /rustc/ab14f944afe4234db378ced3801e637eae6c0f30/compiler/rustc_codegen_ssa/src/mir/operand.rs:98:18:
Box<dyn Any>
stack backtrace:
   0:        0x10c0a2ce3 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h5b162cab46f344a5
   1:        0x10c0ee55b - core::fmt::write::h4a73583a3886d3b0
   2:        0x10c098dbe - std::io::Write::write_fmt::h8846f8d604484bad
   3:        0x10c0a2ad1 - std::sys_common::backtrace::print::h7eceb11702f657b6
   4:        0x10c0a58a9 - std::panicking::default_hook::{{closure}}::he179a4d2e5ce811d
   5:        0x10c0a55f0 - std::panicking::default_hook::h30640957787a5250
   6:        0x114d69dac - std[b2c48648c707f1ed]::panicking::update_hook::<alloc[759ce9084a067d7e]::boxed::Box<rustc_driver_impl[19c236f0e930bd10]::install_ice_hook::{closure#0}>>::{closure#0}
   7:        0x10c0a63b3 - std::panicking::rust_panic_with_hook::hbfe888ce2af6ee0d
   8:        0x114dcf6aa - std[b2c48648c707f1ed]::panicking::begin_panic::<rustc_errors[9015831dbe40c2a7]::ExplicitBug>::{closure#0}
   9:        0x114dc7379 - std[b2c48648c707f1ed]::sys_common::backtrace::__rust_end_short_backtrace::<std[b2c48648c707f1ed]::panicking::begin_panic<rustc_errors[9015831dbe40c2a7]::ExplicitBug>::{closure#0}, !>
  10:        0x1194ff2c9 - std[b2c48648c707f1ed]::panicking::begin_panic::<rustc_errors[9015831dbe40c2a7]::ExplicitBug>
  11:        0x114de2ab6 - <rustc_errors[9015831dbe40c2a7]::diagnostic::BugAbort as rustc_errors[9015831dbe40c2a7]::diagnostic::EmissionGuarantee>::emit_producing_guarantee
  12:        0x1158c89de - rustc_middle[cdd43d02f115379c]::util::bug::opt_span_bug_fmt::<rustc_span[b8a567ff7e2a2eec]::span_encoding::Span>::{closure#0}
  13:        0x11587a457 - rustc_middle[cdd43d02f115379c]::ty::context::tls::with_opt::<rustc_middle[cdd43d02f115379c]::util::bug::opt_span_bug_fmt<rustc_span[b8a567ff7e2a2eec]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  14:        0x115879ef5 - rustc_middle[cdd43d02f115379c]::ty::context::tls::with_context_opt::<rustc_middle[cdd43d02f115379c]::ty::context::tls::with_opt<rustc_middle[cdd43d02f115379c]::util::bug::opt_span_bug_fmt<rustc_span[b8a567ff7e2a2eec]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  15:        0x1195c27fb - rustc_middle[cdd43d02f115379c]::util::bug::bug_fmt
  16:        0x114a12840 - <rustc_codegen_ssa[7403e5ef696b8fc0]::mir::operand::OperandValue<&rustc_codegen_llvm[bd17c2e093d5775d]::llvm_::ffi::Value>>::pointer_parts
  17:        0x114a103bf - <rustc_codegen_ssa[7403e5ef696b8fc0]::mir::FunctionCx<rustc_codegen_llvm[bd17c2e093d5775d]::builder::Builder>>::codegen_rvalue_operand
  18:        0x1149c3734 - rustc_codegen_ssa[7403e5ef696b8fc0]::mir::codegen_mir::<rustc_codegen_llvm[bd17c2e093d5775d]::builder::Builder>
  19:        0x114a87353 - rustc_codegen_llvm[bd17c2e093d5775d]::base::compile_codegen_unit::module_codegen
  20:        0x114ad2cc6 - <rustc_codegen_llvm[bd17c2e093d5775d]::LlvmCodegenBackend as rustc_codegen_ssa[7403e5ef696b8fc0]::traits::backend::ExtraBackendMethods>::compile_codegen_unit
  21:        0x1149cb2f0 - rustc_codegen_ssa[7403e5ef696b8fc0]::base::codegen_crate::<rustc_codegen_llvm[bd17c2e093d5775d]::LlvmCodegenBackend>
  22:        0x114ad8b1a - <rustc_codegen_llvm[bd17c2e093d5775d]::LlvmCodegenBackend as rustc_codegen_ssa[7403e5ef696b8fc0]::traits::backend::CodegenBackend>::codegen_crate
  23:        0x1155320f4 - rustc_interface[22ad048939be8ccd]::passes::start_codegen
  24:        0x11553a52c - <rustc_interface[22ad048939be8ccd]::queries::Queries>::codegen_and_build_linker
  25:        0x114d6866d - rustc_interface[22ad048939be8ccd]::interface::run_compiler::<core[fdc01d03261f4aaa]::result::Result<(), rustc_span[b8a567ff7e2a2eec]::ErrorGuaranteed>, rustc_driver_impl[19c236f0e930bd10]::run_compiler::{closure#0}>::{closure#1}
  26:        0x114d57501 - std[b2c48648c707f1ed]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[22ad048939be8ccd]::util::run_in_thread_with_globals<rustc_interface[22ad048939be8ccd]::util::run_in_thread_pool_with_globals<rustc_interface[22ad048939be8ccd]::interface::run_compiler<core[fdc01d03261f4aaa]::result::Result<(), rustc_span[b8a567ff7e2a2eec]::ErrorGuaranteed>, rustc_driver_impl[19c236f0e930bd10]::run_compiler::{closure#0}>::{closure#1}, core[fdc01d03261f4aaa]::result::Result<(), rustc_span[b8a567ff7e2a2eec]::ErrorGuaranteed>>::{closure#0}, core[fdc01d03261f4aaa]::result::Result<(), rustc_span[b8a567ff7e2a2eec]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[fdc01d03261f4aaa]::result::Result<(), rustc_span[b8a567ff7e2a2eec]::ErrorGuaranteed>>
  27:        0x114d73036 - <<std[b2c48648c707f1ed]::thread::Builder>::spawn_unchecked_<rustc_interface[22ad048939be8ccd]::util::run_in_thread_with_globals<rustc_interface[22ad048939be8ccd]::util::run_in_thread_pool_with_globals<rustc_interface[22ad048939be8ccd]::interface::run_compiler<core[fdc01d03261f4aaa]::result::Result<(), rustc_span[b8a567ff7e2a2eec]::ErrorGuaranteed>, rustc_driver_impl[19c236f0e930bd10]::run_compiler::{closure#0}>::{closure#1}, core[fdc01d03261f4aaa]::result::Result<(), rustc_span[b8a567ff7e2a2eec]::ErrorGuaranteed>>::{closure#0}, core[fdc01d03261f4aaa]::result::Result<(), rustc_span[b8a567ff7e2a2eec]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[fdc01d03261f4aaa]::result::Result<(), rustc_span[b8a567ff7e2a2eec]::ErrorGuaranteed>>::{closure#2} as core[fdc01d03261f4aaa]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  28:        0x10c0afacb - std::sys::pal::unix::thread::Thread::new::thread_start::h176c25cd13ced921
  29:     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/rustc-ice-2024-05-14T03_33_55-1941.txt` to your bug report

query stack during panic:
end of query stack
error: aborting due to 1 previous error; 3 warnings emitted

[Naserume]

Wait it was a duplicate with same code in #54888
Edit: I re-checked the code and it is slightly changed, but the stack before panic is almost identical.
Re-open this issue if anyone think it's a different case