ICE in `shuffle!`

[TheIronBorn]

I came across an ICE in the shuffle macro. Hopefully someone here can find a more minimal example.

error: internal compiler error: /rustc/b3d11f95cc5dd687fdd185ce91e02ebe40e6f46b\compiler\rustc_middle\src\ty\consts.rs:195:32: expected bits of [u32; 2], got Const {

$ rustc --version --verbose
rustc 1.55.0-nightly (b3d11f95c 2021-07-04)
binary: rustc
commit-hash: b3d11f95cc5dd687fdd185ce91e02ebe40e6f46b
commit-date: 2021-07-04
host: x86_64-pc-windows-msvc
release: 1.55.0-nightly
LLVM version: 12.0.1

use packed_simd::{u8x2, shuffle};

pub fn foo(x: u8x2) -> u8x2 {
    shuffle!(x, [1, 0])
}

click to expand full output of `RUST_BACKTRACE=full cargo build -vv`

error: internal compiler error: /rustc/b3d11f95cc5dd687fdd185ce91e02ebe40e6f46b\compiler\rustc_middl
e\src\ty\consts.rs:195:32: expected bits of [u32; 2], got Const {
    ty: [u32; 2],
    val: Value(
        ByRef {
            alloc: Allocation {
                bytes: [
                    1,
                    0,
                    0,
                    0,
                    0,
                    0,
                    0,
                    0,
                ],
                relocations: Relocations(
                    SortedMap {
                        data: [],
                    },
                ),
                init_mask: InitMask {
                    blocks: [
                        255,
                    ],
                    len: Size {
                        raw: 8,
                    },
                },
                align: Align {
                    pow2: 2,
                },
                mutability: Not,
                extra: (),
            },
            offset: Size {
                raw: 0,
            },
        },
    ),
}

thread 'rustc' panicked at 'Box<dyn Any>', compiler\rustc_errors\src\lib.rs:1006:9
stack backtrace:
   0:     0x7ff91e7b73cf - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Displ
ay>::fmt::h6ba2a9241bb86732
   1:     0x7ff91e7dff7a - core::fmt::write::ha9fdc24e2055a123
   2:     0x7ff91e7aa948 - <std::io::IoSlice as core::fmt::Debug>::fmt::h2f7de836a9fea840
   3:     0x7ff91e7bb106 - std::panicking::take_hook::h880a3a97a8692ac2
   4:     0x7ff91e7babe9 - std::panicking::take_hook::h880a3a97a8692ac2
   5:     0x7ff90bd546d5 - <sha2::sha512::Sha512Trunc224 as std::io::Write>::flush::hee6b95fd494feb4
c
   6:     0x7ff91e7bba00 - std::panicking::rust_panic_with_hook::hf71bb7c83433b29f
   7:     0x7ff90ffadbd0 - <rustc_errors::lock::acquire_global_lock::Guard as core::ops::drop::Drop>
::drop::h4f8f15aa7cec4dfd
   8:     0x7ff90ffadb79 - <rustc_errors::lock::acquire_global_lock::Guard as core::ops::drop::Drop>
::drop::h4f8f15aa7cec4dfd
   9:     0x7ff91026afd1 - rustc_query_system::query::job::report_cycle::h6ad95b2abe0c2755
  10:     0x7ff90ffdc6e0 - <rustc_errors::json::Diagnostic::from_errors_diagnostic::BufWriter as std
::io::Write>::flush::h047ec1cbb3679d84
  11:     0x7ff90ffe3025 - rustc_errors::HandlerInner::emit_diagnostic::heb8a31dc5e552518
  12:     0x7ff90ffe0b92 - rustc_errors::Handler::bug::hb2ff7ec66402551f
  13:     0x7ff90fccd657 - rustc_middle::ty::structural_impls::<impl core::fmt::Debug for rustc_midd
le::ty::adt::AdtDef>::fmt::h5869c3d44553f282
  14:     0x7ff90fccbca0 - rustc_middle::ty::consts::valtree::ValTree::zst::hb865eec6f9683d1a
  15:     0x7ff90fccbc48 - rustc_middle::ty::consts::valtree::ValTree::zst::hb865eec6f9683d1a
  16:     0x7ff90fccd589 - rustc_middle::ty::structural_impls::<impl core::fmt::Debug for rustc_midd
le::ty::adt::AdtDef>::fmt::h5869c3d44553f282
  17:     0x7ff91025e327 - rustc_middle::util::bug::bug_fmt::hf198e31916c1b343
  18:     0x7ff90f3afec4 - <rustc_codegen_ssa::mir::analyze::CleanupKind as core::fmt::Debug>::fmt::
h5a59164a64d0c7a5
  19:     0x7ff90f3b704a - rustc_codegen_ssa::debuginfo::type_names::push_item_name::he75481756ae840
39
  20:     0x7ff90f3b7168 - rustc_codegen_ssa::debuginfo::type_names::push_generic_params::h1d7916d50
aafc08c
  21:     0x7ff90c01440c - <rustc_codegen_llvm::debuginfo::CrateDebugContext as core::ops::drop::Dro
p>::drop::h3f55eba9dc119554
  22:     0x7ff90bff897c - rustc_codegen_llvm::debuginfo::<impl rustc_codegen_ssa::traits::debuginfo
::DebugInfoMethods for rustc_codegen_llvm::context::CodegenCx>::dbg_scope_fn::h7630bb4433b6b0de
  23:     0x7ff90bff82e1 - rustc_codegen_llvm::debuginfo::<impl rustc_codegen_ssa::traits::debuginfo
::DebugInfoMethods for rustc_codegen_llvm::context::CodegenCx>::create_function_debug_context::hd74d
70b70418a925
  24:     0x7ff90c06c3e6 - <rustc_type_ir::FloatTy as rustc_codegen_llvm::debuginfo::metadata::MsvcB
asicName>::msvc_basic_name::h6b1292e95eb170dd
  25:     0x7ff90c0030e2 - <rustc_target::abi::TyAndLayout<&rustc_middle::ty::TyS> as rustc_codegen_
llvm::type_of::LayoutLlvmExt>::pointee_info_at::hf141ea5b2b5b9458
  26:     0x7ff90c02e60c - <rustc_codegen_llvm::llvm_::ffi::PassKind as core::fmt::Debug>::fmt::h73e
4370ce386cd1a
  27:     0x7ff90c03c81f - <rustc_codegen_llvm::base::ValueIter as core::iter::traits::iterator::Ite
rator>::next::he88ed3976c9ce471
  28:     0x7ff90bfaa09e - <rustc_codegen_llvm::llvm_::archive_ro::Child as core::ops::drop::Drop>::
drop::h4adaeb3876bff26c
  29:     0x7ff90c005313 - <rustc_target::abi::TyAndLayout<&rustc_middle::ty::TyS> as rustc_codegen_
llvm::type_of::LayoutLlvmExt>::pointee_info_at::hf141ea5b2b5b9458
  30:     0x7ff90c03c133 - <rustc_codegen_llvm::base::ValueIter as core::iter::traits::iterator::Ite
rator>::next::he88ed3976c9ce471
  31:     0x7ff90c017cdd - <rustc_codegen_llvm::LlvmCodegenBackend as rustc_codegen_ssa::traits::bac
kend::CodegenBackend>::codegen_crate::h2e599f3191e20a15
  32:     0x7ff90be99b0d - rustc_interface::queries::Linker::link::he04c478b0566dbcf
  33:     0x7ff90be8e786 - rustc_interface::queries::Queries::ongoing_codegen::hdb76edc87db3cf80
  34:     0x7ff90bdaa7bf - <rustc_middle::ty::SymbolName as core::fmt::Debug>::fmt::h1888c009faa2f58
c
  35:     0x7ff90bd7234d - rustc_driver::pretty::print_after_hir_lowering::h982e6ec8534626ef
  36:     0x7ff90bdac7e9 - <rustc_middle::ty::SymbolName as core::fmt::Debug>::fmt::h1888c009faa2f58
c
  37:     0x7ff90bd7c9ba - <rustc_middle::ty::SymbolName as core::fmt::Debug>::fmt::h1888c009faa2f58
c
  38:     0x7ff90bd72f5f - rustc_driver::pretty::print_after_hir_lowering::h982e6ec8534626ef
  39:     0x7ff90bdd0f9d - <rustc_driver::args::Error as core::fmt::Debug>::fmt::hac2312e292f84c23
  40:     0x7ff91e7c92dc - std::sys::windows::thread::Thread::new::hd7a080f67ca1d43d
  41:     0x7ff95df17034 - BaseThreadInitThunk
  42:     0x7ff95e582651 - RtlUserThreadStart

[workingjubilee]

Appears to be resolved upstream.