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ICE: dereferencing Adt(..) #115789

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matthiaskrgr opened this issue Sep 12, 2023 · 1 comment · Fixed by #115794
Closed

ICE: dereferencing Adt(..) #115789

matthiaskrgr opened this issue Sep 12, 2023 · 1 comment · Fixed by #115794
Labels
A-mir-opt Area: MIR optimizations C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.

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Code

rustc -Zmir-opt-level=3

#[derive(Default)]
struct A {
    foo: Box<[bool]>,
}

pub fn main() {
    let a: A = Default::default();
}

Meta

rustc --version --verbose:

rustc 1.74.0-nightly (5f6ee65f5 2023-09-12)
binary: rustc
commit-hash: 5f6ee65f594f59f64c7957dcad90edc0b8830284
commit-date: 2023-09-12
host: x86_64-unknown-linux-gnu
release: 1.74.0-nightly
LLVM version: 17.0.0

Error output

warning: unused variable: `a`
 --> deriving-default-box.rs:7:9
  |
7 |     let a: A = Default::default();
  |         ^ help: if this is intentional, prefix it with an underscore: `_a`
  |
  = note: `#[warn(unused_variables)]` on by default

warning: field `foo` is never read
 --> deriving-default-box.rs:3:5
  |
2 | struct A {
  |        - field in this struct
3 |     foo: Box<[bool]>,
  |     ^^^
  |
  = note: `#[warn(dead_code)]` on by default
Backtrace 

error: internal compiler error: /rustc/5f6ee65f594f59f64c7957dcad90edc0b8830284/compiler/rustc_const_eval/src/interpret/place.rs:459:13: dereferencing Adt(std::boxed::Box, [[bool], Adt(std::alloc::Global, [])])

thread 'rustc' panicked at /rustc/5f6ee65f594f59f64c7957dcad90edc0b8830284/compiler/rustc_errors/src/lib.rs:1651:9:
Box<dyn Any>
stack backtrace:
   0:     0x7f9293762efc - std::backtrace_rs::backtrace::libunwind::trace::h55359a43d1951496
                               at /rustc/5f6ee65f594f59f64c7957dcad90edc0b8830284/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7f9293762efc - std::backtrace_rs::backtrace::trace_unsynchronized::hda60d3b694a048da
                               at /rustc/5f6ee65f594f59f64c7957dcad90edc0b8830284/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f9293762efc - std::sys_common::backtrace::_print_fmt::hcaa923c54f0b748c
                               at /rustc/5f6ee65f594f59f64c7957dcad90edc0b8830284/library/std/src/sys_common/backtrace.rs:67:5
   3:     0x7f9293762efc - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hca7b9c7634bb6a2d
                               at /rustc/5f6ee65f594f59f64c7957dcad90edc0b8830284/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f92937c915c - core::fmt::rt::Argument::fmt::h7e480ad4000d1ede
                               at /rustc/5f6ee65f594f59f64c7957dcad90edc0b8830284/library/core/src/fmt/rt.rs:138:9
   5:     0x7f92937c915c - core::fmt::write::h40ba427150be4d5d
                               at /rustc/5f6ee65f594f59f64c7957dcad90edc0b8830284/library/core/src/fmt/mod.rs:1094:21
   6:     0x7f929375593e - std::io::Write::write_fmt::h07c5cdbac563b1a2
                               at /rustc/5f6ee65f594f59f64c7957dcad90edc0b8830284/library/std/src/io/mod.rs:1714:15
   7:     0x7f9293762ce4 - std::sys_common::backtrace::_print::h8043b2171f37ee3c
                               at /rustc/5f6ee65f594f59f64c7957dcad90edc0b8830284/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7f9293762ce4 - std::sys_common::backtrace::print::hf8d132542a9b3f6f
                               at /rustc/5f6ee65f594f59f64c7957dcad90edc0b8830284/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7f9293765dda - std::panicking::panic_hook_with_disk_dump::{{closure}}::hdcac91a615e070a2
                               at /rustc/5f6ee65f594f59f64c7957dcad90edc0b8830284/library/std/src/panicking.rs:280:22
  10:     0x7f9293765ad5 - std::panicking::panic_hook_with_disk_dump::hbcae72cec2baf967
                               at /rustc/5f6ee65f594f59f64c7957dcad90edc0b8830284/library/std/src/panicking.rs:314:9
  11:     0x7f929693b599 - rustc_driver_impl[43bd6da197b49f55]::install_ice_hook::{closure#0}
  12:     0x7f9293766693 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::hc4f47c97a460cd11
                               at /rustc/5f6ee65f594f59f64c7957dcad90edc0b8830284/library/alloc/src/boxed.rs:2021:9
  13:     0x7f9293766693 - std::panicking::rust_panic_with_hook::h109420236226f3ee
                               at /rustc/5f6ee65f594f59f64c7957dcad90edc0b8830284/library/std/src/panicking.rs:757:13
  14:     0x7f9296ea4734 - std[7db58085941d9bac]::panicking::begin_panic::<rustc_errors[c1b6cc29bebdb6ab]::ExplicitBug>::{closure#0}
  15:     0x7f9296ea2f96 - std[7db58085941d9bac]::sys_common::backtrace::__rust_end_short_backtrace::<std[7db58085941d9bac]::panicking::begin_panic<rustc_errors[c1b6cc29bebdb6ab]::ExplicitBug>::{closure#0}, !>
  16:     0x7f9296e441b6 - std[7db58085941d9bac]::panicking::begin_panic::<rustc_errors[c1b6cc29bebdb6ab]::ExplicitBug>
  17:     0x7f9296ebc884 - <rustc_errors[c1b6cc29bebdb6ab]::HandlerInner>::bug::<alloc[1d0d6505afdbca5c]::string::String>
  18:     0x7f9296ebc744 - <rustc_errors[c1b6cc29bebdb6ab]::Handler>::bug::<alloc[1d0d6505afdbca5c]::string::String>
  19:     0x7f9296f006cc - rustc_middle[29c00dc8642989c6]::util::bug::opt_span_bug_fmt::<rustc_span[30e21d5074f476ed]::span_encoding::Span>::{closure#0}
  20:     0x7f9296efd00a - rustc_middle[29c00dc8642989c6]::ty::context::tls::with_opt::<rustc_middle[29c00dc8642989c6]::util::bug::opt_span_bug_fmt<rustc_span[30e21d5074f476ed]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  21:     0x7f9296efcfd8 - rustc_middle[29c00dc8642989c6]::ty::context::tls::with_context_opt::<rustc_middle[29c00dc8642989c6]::ty::context::tls::with_opt<rustc_middle[29c00dc8642989c6]::util::bug::opt_span_bug_fmt<rustc_span[30e21d5074f476ed]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  22:     0x7f929536fdd0 - rustc_middle[29c00dc8642989c6]::util::bug::bug_fmt
  23:     0x7f92970f4dd8 - <rustc_const_eval[359a46a105bbed5a]::interpret::eval_context::InterpCx<rustc_mir_transform[95c4ccea1ed9f734]::dataflow_const_prop::DummyMachine>>::deref_pointer::<rustc_const_eval[359a46a105bbed5a]::interpret::operand::OpTy>
  24:     0x7f92970b0af5 - <rustc_mir_transform[95c4ccea1ed9f734]::dataflow_const_prop::ConstAnalysis>::assign_constant::{closure#0}
  25:     0x7f92970a1bc2 - <rustc_mir_dataflow[1ae8acabcb9c35eb]::value_analysis::Map>::for_each_projection_value::<rustc_const_eval[359a46a105bbed5a]::interpret::operand::OpTy, <rustc_mir_transform[95c4ccea1ed9f734]::dataflow_const_prop::ConstAnalysis>::assign_constant::{closure#0}, <rustc_mir_transform[95c4ccea1ed9f734]::dataflow_const_prop::ConstAnalysis>::assign_constant::{closure#1}>
  26:     0x7f92970e6990 - <rustc_mir_transform[95c4ccea1ed9f734]::dataflow_const_prop::ConstAnalysis>::assign_constant
  27:     0x7f92970e3c85 - <rustc_mir_transform[95c4ccea1ed9f734]::dataflow_const_prop::ConstAnalysis>::assign_operand
  28:     0x7f92970b675a - <rustc_mir_dataflow[1ae8acabcb9c35eb]::framework::engine::Engine<rustc_mir_dataflow[1ae8acabcb9c35eb]::value_analysis::ValueAnalysisWrapper<rustc_mir_transform[95c4ccea1ed9f734]::dataflow_const_prop::ConstAnalysis>>>::iterate_to_fixpoint
  29:     0x7f929704c9d5 - <tracing[f2b2d97559c71f19]::span::Span>::in_scope::<<rustc_mir_transform[95c4ccea1ed9f734]::dataflow_const_prop::DataflowConstProp as rustc_middle[29c00dc8642989c6]::mir::MirPass>::run_pass::{closure#0}, rustc_mir_dataflow[1ae8acabcb9c35eb]::framework::engine::Results<rustc_mir_dataflow[1ae8acabcb9c35eb]::value_analysis::ValueAnalysisWrapper<rustc_mir_transform[95c4ccea1ed9f734]::dataflow_const_prop::ConstAnalysis>, rustc_index[ee8d55f91f439666]::vec::IndexVec<rustc_middle[29c00dc8642989c6]::mir::BasicBlock, rustc_mir_dataflow[1ae8acabcb9c35eb]::value_analysis::State<rustc_mir_dataflow[1ae8acabcb9c35eb]::framework::lattice::FlatSet<rustc_middle[29c00dc8642989c6]::mir::interpret::value::Scalar>>>>>
  30:     0x7f92970e6620 - <rustc_mir_transform[95c4ccea1ed9f734]::dataflow_const_prop::DataflowConstProp as rustc_middle[29c00dc8642989c6]::mir::MirPass>::run_pass
  31:     0x7f9295875b0d - rustc_mir_transform[95c4ccea1ed9f734]::pass_manager::run_passes
  32:     0x7f9295875147 - rustc_mir_transform[95c4ccea1ed9f734]::optimized_mir
  33:     0x7f9294a97618 - rustc_query_impl[bf10786a05429046]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[bf10786a05429046]::query_impl::optimized_mir::dynamic_query::{closure#2}::{closure#0}, rustc_middle[29c00dc8642989c6]::query::erase::Erased<[u8; 8usize]>>
  34:     0x7f9294a975e1 - <rustc_query_impl[bf10786a05429046]::query_impl::optimized_mir::dynamic_query::{closure#2} as core[22cc6ecfdb6bcca5]::ops::function::FnOnce<(rustc_middle[29c00dc8642989c6]::ty::context::TyCtxt, rustc_span[30e21d5074f476ed]::def_id::DefId)>>::call_once
  35:     0x7f9294a4d160 - rustc_query_system[9effd60937474be5]::query::plumbing::try_execute_query::<rustc_query_impl[bf10786a05429046]::DynamicConfig<rustc_query_system[9effd60937474be5]::query::caches::DefaultCache<rustc_span[30e21d5074f476ed]::def_id::DefId, rustc_middle[29c00dc8642989c6]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[bf10786a05429046]::plumbing::QueryCtxt, false>
  36:     0x7f92962c7682 - rustc_query_impl[bf10786a05429046]::query_impl::optimized_mir::get_query_non_incr::__rust_end_short_backtrace
  37:     0x7f9294d0e190 - <rustc_middle[29c00dc8642989c6]::ty::context::TyCtxt>::instance_mir
  38:     0x7f9295967087 - <rustc_mir_transform[95c4ccea1ed9f734]::inline::Inliner>::try_inlining
  39:     0x7f9295966513 - <rustc_mir_transform[95c4ccea1ed9f734]::inline::Inliner>::process_blocks
  40:     0x7f9295965f04 - <rustc_mir_transform[95c4ccea1ed9f734]::inline::Inline as rustc_middle[29c00dc8642989c6]::mir::MirPass>::run_pass
  41:     0x7f9295875b0d - rustc_mir_transform[95c4ccea1ed9f734]::pass_manager::run_passes
  42:     0x7f9295875147 - rustc_mir_transform[95c4ccea1ed9f734]::optimized_mir
  43:     0x7f9294a97618 - rustc_query_impl[bf10786a05429046]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[bf10786a05429046]::query_impl::optimized_mir::dynamic_query::{closure#2}::{closure#0}, rustc_middle[29c00dc8642989c6]::query::erase::Erased<[u8; 8usize]>>
  44:     0x7f9294a975e1 - <rustc_query_impl[bf10786a05429046]::query_impl::optimized_mir::dynamic_query::{closure#2} as core[22cc6ecfdb6bcca5]::ops::function::FnOnce<(rustc_middle[29c00dc8642989c6]::ty::context::TyCtxt, rustc_span[30e21d5074f476ed]::def_id::DefId)>>::call_once
  45:     0x7f9294a4d160 - rustc_query_system[9effd60937474be5]::query::plumbing::try_execute_query::<rustc_query_impl[bf10786a05429046]::DynamicConfig<rustc_query_system[9effd60937474be5]::query::caches::DefaultCache<rustc_span[30e21d5074f476ed]::def_id::DefId, rustc_middle[29c00dc8642989c6]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[bf10786a05429046]::plumbing::QueryCtxt, false>
  46:     0x7f92962c7682 - rustc_query_impl[bf10786a05429046]::query_impl::optimized_mir::get_query_non_incr::__rust_end_short_backtrace
  47:     0x7f9294d0e190 - <rustc_middle[29c00dc8642989c6]::ty::context::TyCtxt>::instance_mir
  48:     0x7f92954aea02 - rustc_monomorphize[7ba1c9e625a37714]::collector::collect_used_items
  49:     0x7f92954abdde - rustc_monomorphize[7ba1c9e625a37714]::collector::collect_items_rec
  50:     0x7f9295d213e1 - <rustc_data_structures[b259781372983027]::sync::parallel::ParallelGuard>::run::<(), rustc_data_structures[b259781372983027]::sync::parallel::disabled::par_for_each_in<alloc[1d0d6505afdbca5c]::vec::Vec<rustc_middle[29c00dc8642989c6]::mir::mono::MonoItem>, rustc_monomorphize[7ba1c9e625a37714]::collector::collect_crate_mono_items::{closure#1}::{closure#0}>::{closure#0}::{closure#0}::{closure#0}>
  51:     0x7f9295d212fb - rustc_data_structures[b259781372983027]::sync::parallel::disabled::par_for_each_in::<alloc[1d0d6505afdbca5c]::vec::Vec<rustc_middle[29c00dc8642989c6]::mir::mono::MonoItem>, rustc_monomorphize[7ba1c9e625a37714]::collector::collect_crate_mono_items::{closure#1}::{closure#0}>
  52:     0x7f9295d21189 - <rustc_session[797cecdacaf7bd8a]::session::Session>::time::<(), rustc_monomorphize[7ba1c9e625a37714]::collector::collect_crate_mono_items::{closure#1}>
  53:     0x7f9295d20de8 - rustc_monomorphize[7ba1c9e625a37714]::collector::collect_crate_mono_items
  54:     0x7f9295d1f118 - rustc_monomorphize[7ba1c9e625a37714]::partitioning::collect_and_partition_mono_items
  55:     0x7f9295f142f9 - rustc_query_impl[bf10786a05429046]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[bf10786a05429046]::query_impl::collect_and_partition_mono_items::dynamic_query::{closure#2}::{closure#0}, rustc_middle[29c00dc8642989c6]::query::erase::Erased<[u8; 24usize]>>
  56:     0x7f9295f142cd - <rustc_query_impl[bf10786a05429046]::query_impl::collect_and_partition_mono_items::dynamic_query::{closure#2} as core[22cc6ecfdb6bcca5]::ops::function::FnOnce<(rustc_middle[29c00dc8642989c6]::ty::context::TyCtxt, ())>>::call_once
  57:     0x7f92960d6557 - rustc_query_system[9effd60937474be5]::query::plumbing::try_execute_query::<rustc_query_impl[bf10786a05429046]::DynamicConfig<rustc_query_system[9effd60937474be5]::query::caches::SingleCache<rustc_middle[29c00dc8642989c6]::query::erase::Erased<[u8; 24usize]>>, false, false, false>, rustc_query_impl[bf10786a05429046]::plumbing::QueryCtxt, false>
  58:     0x7f92962e31a2 - rustc_query_impl[bf10786a05429046]::query_impl::collect_and_partition_mono_items::get_query_non_incr::__rust_end_short_backtrace
  59:     0x7f9295f4557b - rustc_codegen_ssa[6f94cf36afb6d0d8]::base::codegen_crate::<rustc_codegen_llvm[d1d947d70c71a977]::LlvmCodegenBackend>
  60:     0x7f9295f4537f - <rustc_codegen_llvm[d1d947d70c71a977]::LlvmCodegenBackend as rustc_codegen_ssa[6f94cf36afb6d0d8]::traits::backend::CodegenBackend>::codegen_crate
  61:     0x7f9295e69812 - <rustc_session[797cecdacaf7bd8a]::session::Session>::time::<alloc[1d0d6505afdbca5c]::boxed::Box<dyn core[22cc6ecfdb6bcca5]::any::Any>, rustc_interface[dab9391c2a8d484a]::passes::start_codegen::{closure#0}>
  62:     0x7f9295e6936b - rustc_interface[dab9391c2a8d484a]::passes::start_codegen
  63:     0x7f9295e63cba - <rustc_middle[29c00dc8642989c6]::ty::context::GlobalCtxt>::enter::<<rustc_interface[dab9391c2a8d484a]::queries::Queries>::ongoing_codegen::{closure#0}, core[22cc6ecfdb6bcca5]::result::Result<alloc[1d0d6505afdbca5c]::boxed::Box<dyn core[22cc6ecfdb6bcca5]::any::Any>, rustc_span[30e21d5074f476ed]::ErrorGuaranteed>>
  64:     0x7f9295e630c2 - <rustc_interface[dab9391c2a8d484a]::interface::Compiler>::enter::<rustc_driver_impl[43bd6da197b49f55]::run_compiler::{closure#1}::{closure#2}, core[22cc6ecfdb6bcca5]::result::Result<core[22cc6ecfdb6bcca5]::option::Option<rustc_interface[dab9391c2a8d484a]::queries::Linker>, rustc_span[30e21d5074f476ed]::ErrorGuaranteed>>
  65:     0x7f9295e5c334 - std[7db58085941d9bac]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[dab9391c2a8d484a]::util::run_in_thread_with_globals<rustc_interface[dab9391c2a8d484a]::interface::run_compiler<core[22cc6ecfdb6bcca5]::result::Result<(), rustc_span[30e21d5074f476ed]::ErrorGuaranteed>, rustc_driver_impl[43bd6da197b49f55]::run_compiler::{closure#1}>::{closure#0}, core[22cc6ecfdb6bcca5]::result::Result<(), rustc_span[30e21d5074f476ed]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[22cc6ecfdb6bcca5]::result::Result<(), rustc_span[30e21d5074f476ed]::ErrorGuaranteed>>
  66:     0x7f9295e5ba8e - <<std[7db58085941d9bac]::thread::Builder>::spawn_unchecked_<rustc_interface[dab9391c2a8d484a]::util::run_in_thread_with_globals<rustc_interface[dab9391c2a8d484a]::interface::run_compiler<core[22cc6ecfdb6bcca5]::result::Result<(), rustc_span[30e21d5074f476ed]::ErrorGuaranteed>, rustc_driver_impl[43bd6da197b49f55]::run_compiler::{closure#1}>::{closure#0}, core[22cc6ecfdb6bcca5]::result::Result<(), rustc_span[30e21d5074f476ed]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[22cc6ecfdb6bcca5]::result::Result<(), rustc_span[30e21d5074f476ed]::ErrorGuaranteed>>::{closure#1} as core[22cc6ecfdb6bcca5]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  67:     0x7f9293771075 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h6e391959b1043522
                               at /rustc/5f6ee65f594f59f64c7957dcad90edc0b8830284/library/alloc/src/boxed.rs:2007:9
  68:     0x7f9293771075 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h80e392a53addb656
                               at /rustc/5f6ee65f594f59f64c7957dcad90edc0b8830284/library/alloc/src/boxed.rs:2007:9
  69:     0x7f9293771075 - std::sys::unix::thread::Thread::new::thread_start::h8c6721ffb353e658
                               at /rustc/5f6ee65f594f59f64c7957dcad90edc0b8830284/library/std/src/sys/unix/thread.rs:108:17
  70:     0x7f929348c9eb - <unknown>
  71:     0x7f9293510dfc - <unknown>
  72:                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: please attach the file at `/tmp/2/icemaker_reduced/rustc-ice-2023-09-12T15:53:40.73879349Z-2966290.txt` to your bug report

note: compiler flags: -Z mir-opt-level=3

query stack during panic:
#0 [optimized_mir] optimizing MIR for `<impl at deriving-default-box.rs:1:10: 1:17>::default`
#1 [optimized_mir] optimizing MIR for `main`
#2 [collect_and_partition_mono_items] collect_and_partition_mono_items
end of query stack
error: aborting due to previous error; 2 warnings emitted

@matthiaskrgr matthiaskrgr added I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. C-bug Category: This is a bug. labels Sep 12, 2023
@rustbot rustbot added the needs-triage This issue may need triage. Remove it if it has been sufficiently triaged. label Sep 12, 2023
@matthiaskrgr
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cc7a9d6 #115705 cc @cjgillot

@cjgillot cjgillot mentioned this issue Sep 12, 2023
Merged
@saethlin saethlin added A-mir-opt Area: MIR optimizations and removed needs-triage This issue may need triage. Remove it if it has been sufficiently triaged. labels Sep 12, 2023
bors added a commit to rust-lang-ci/rust that referenced this issue Sep 20, 2023
@bors
Auto merge of rust-lang#115794 - cjgillot:aggregate-no-box, r=davidtwco
4f5d3b9 
Do not create a DerefLen place for `Box<[T]>`.

Fixes rust-lang#115789
matthiaskrgr added a commit to matthiaskrgr/rust that referenced this issue Sep 23, 2023
@matthiaskrgr
Rollup merge of rust-lang#115794 - cjgillot:aggregate-no-box, r=david…
b64bb0d 
…twco

Do not create a DerefLen place for `Box<[T]>`.

Fixes rust-lang#115789
@bors bors closed this as completed in 551c718 Sep 24, 2023
github-actions bot pushed a commit to rust-lang/miri that referenced this issue Sep 27, 2023
@bors
Auto merge of #115794 - cjgillot:aggregate-no-box, r=davidtwco
44d1839 
Do not create a DerefLen place for `Box<[T]>`.

Fixes rust-lang/rust#115789
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A-mir-opt Area: MIR optimizations C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
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Do not create a DerefLen place for Box<[T]>. cjgillot/rust
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