ICE array-size-in-generic-struct-param.rs: const parameter `CFG/#0` (Const { ty: Config, val: Param(CFG/#0) }/0) out of range when substituting substs=[]

[matthiaskrgr]

Code

code from ./src/test/ui/const-generics/array-size-in-generic-struct-param.rs

// Tests that array sizes that depend on const-params are checked using `ConstEvaluatable`.
// revisions: full min

#![cfg_attr(full, feature(const_generics))]
#![cfg_attr(full, allow(incomplete_features))]
#![cfg_attr(min, feature(min_const_generics))]

#[allow(dead_code)]
struct ArithArrayLen<const N: usize>([u32; 0 + N]);

#[derive(PartialEq, Eq)]
struct Config {
    arr_size: usize,
}

struct B<const CFG: Config> {
    arr: [u8; CFG.arr_size],
}

const C: Config = Config { arr_size: 5 };

fn main() {
    let b = B::<C> { arr: [1, 2, 3, 4, 5] };
    assert_eq!(b.arr.len(), 5);
}

Meta

repo @ 5e3f1b1

Error output

error[E0658]: const generics are unstable
 --> ./src/test/ui/const-generics/array-size-in-generic-struct-param.rs:9:28
  |
9 | struct ArithArrayLen<const N: usize>([u32; 0 + N]);
  |                            ^
  |
  = note: see issue #74878 <https://github.com/rust-lang/rust/issues/74878> for more information
  = help: add `#![feature(min_const_generics)]` to the crate attributes to enable

error[E0658]: const generics are unstable
  --> ./src/test/ui/const-generics/array-size-in-generic-struct-param.rs:16:16
   |
16 | struct B<const CFG: Config> {
   |                ^^^
   |
   = note: see issue #74878 <https://github.com/rust-lang/rust/issues/74878> for more information
   = help: add `#![feature(min_const_generics)]` to the crate attributes to enable

error: internal compiler error: src/librustc_middle/ty/subst.rs:569:17: const parameter `N/#0` (Const { ty: usize, val: Param(N/#0) }/0) out of range when substituting substs=[]

thread 'rustc' panicked at 'Box<Any>', /home/matthias/vcs/github/rust/library/std/src/macros.rs:13:23
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

note: the compiler unexpectedly panicked. this is a bug.

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 1.47.0-dev running on x86_64-unknown-linux-gnu

error: internal compiler error: src/librustc_middle/ty/subst.rs:569:17: const parameter `CFG/#0` (Const { ty: Config, val: Param(CFG/#0) }/0) out of range when substituting substs=[]

thread 'rustc' panicked at 'Box<Any>', /home/matthias/vcs/github/rust/library/std/src/macros.rs:13:23

note: the compiler unexpectedly panicked. this is a bug.

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 1.47.0-dev running on x86_64-unknown-linux-gnu

error: aborting due to 4 previous errors

For more information about this error, try `rustc --explain E0658`.

Backtrace

error[E0658]: const generics are unstable
 --> ./src/test/ui/const-generics/array-size-in-generic-struct-param.rs:9:28
  |
9 | struct ArithArrayLen<const N: usize>([u32; 0 + N]);
  |                            ^
  |
  = note: see issue #74878 <https://github.com/rust-lang/rust/issues/74878> for more information
  = help: add `#![feature(min_const_generics)]` to the crate attributes to enable

error[E0658]: const generics are unstable
  --> ./src/test/ui/const-generics/array-size-in-generic-struct-param.rs:16:16
   |
16 | struct B<const CFG: Config> {
   |                ^^^
   |
   = note: see issue #74878 <https://github.com/rust-lang/rust/issues/74878> for more information
   = help: add `#![feature(min_const_generics)]` to the crate attributes to enable

error: internal compiler error: src/librustc_middle/ty/subst.rs:569:17: const parameter `N/#0` (Const { ty: usize, val: Param(N/#0) }/0) out of range when substituting substs=[]

thread 'rustc' panicked at 'Box<Any>', /home/matthias/vcs/github/rust/library/std/src/macros.rs:13:23
stack backtrace:
   0:     0x7f62b2fb3d91 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h9a65342185cb7022
   1:     0x7f62b30222cd - core::fmt::write::hc3de054a6627b208
   2:     0x7f62b2f93ab3 - std::io::Write::write_fmt::h64bd8d8dca95fd5c
   3:     0x7f62b2f8cb10 - std::panicking::default_hook::{{closure}}::ha9c6947a872dc513
   4:     0x7f62b2f8c74d - std::panicking::default_hook::h3e5e46d076456208
   5:     0x7f62b4071269 - rustc_driver::report_ice::he0572c9ff71e0a8c
   6:     0x7f62b2f8d156 - std::panicking::rust_panic_with_hook::h30c558028146672c
   7:     0x7f62b652656d - std::panicking::begin_panic::{{closure}}::h96c5d8b23c10b36a
   8:     0x7f62b6526356 - std::sys_common::backtrace::__rust_end_short_backtrace::h98f679cf3c561f3c
   9:     0x7f62b633111f - std::panicking::begin_panic::h65c51a53a81437fd
  10:     0x7f62b669cbec - rustc_errors::HandlerInner::span_bug::ha07457fa25949e84
  11:     0x7f62b669d2f0 - rustc_errors::Handler::span_bug::hbb74711f3db8ebf3
  12:     0x7f62b6624018 - rustc_middle::util::bug::opt_span_bug_fmt::{{closure}}::h4a7f07794a96b9b2
  13:     0x7f62b660a703 - rustc_middle::ty::context::tls::with_opt::{{closure}}::h19e60cd4fc7d8059
  14:     0x7f62b660a669 - rustc_middle::ty::context::tls::with_opt::h346f3e655bc513dc
  15:     0x7f62b6623f17 - rustc_middle::util::bug::opt_span_bug_fmt::h35bf29c4eb538873
  16:     0x7f62b6623ed1 - rustc_middle::util::bug::span_bug_fmt::h280140fbfd3b6cca
  17:     0x7f62b65f48a3 - <rustc_middle::ty::subst::SubstFolder as rustc_middle::ty::fold::TypeFolder>::fold_const::h7a50de3c95311e03
  18:     0x7f62b5544add - rustc_middle::ty::normalize_erasing_regions::<impl rustc_middle::ty::context::TyCtxt>::subst_and_normalize_erasing_regions::h79e6d568f2bee0ca
  19:     0x7f62b5273fbb - rustc_mir::interpret::operand::<impl rustc_mir::interpret::eval_context::InterpCx<M>>::eval_operand::hccef71beb839ca33
  20:     0x7f62b529ed29 - rustc_mir::interpret::step::<impl rustc_mir::interpret::eval_context::InterpCx<M>>::eval_rvalue_into_place::hbc3e67db53b60802
  21:     0x7f62b5290dad - rustc_mir::interpret::step::<impl rustc_mir::interpret::eval_context::InterpCx<M>>::run::h4e302c3d25a3f08c
  22:     0x7f62b53a592f - rustc_mir::const_eval::eval_queries::const_eval_raw_provider::h105f922d09dd2652
  23:     0x7f62b5317524 - rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::const_eval_raw>::compute::h04b2e5889c7d6d53
  24:     0x7f62b5174949 - rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl::h3dd8792e6d237967
  25:     0x7f62b532777e - rustc_data_structures::stack::ensure_sufficient_stack::h2228541d95921492
  26:     0x7f62b5575cb3 - rustc_query_system::query::plumbing::get_query_impl::h240b503fbcb2e001
  27:     0x7f62b53a3677 - rustc_mir::const_eval::eval_queries::const_eval_validated_provider::h98bdfd50fd8392b3
  28:     0x7f62b5318274 - rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::const_eval_validated>::compute::he4d9d5d8296e782d
  29:     0x7f62b51814a9 - rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl::hc6404f0b5657110e
  30:     0x7f62b53264ee - rustc_data_structures::stack::ensure_sufficient_stack::h0172bed68fd28962
  31:     0x7f62b5596e2c - rustc_query_system::query::plumbing::get_query_impl::h6cf806f9a2b220d0
  32:     0x7f62b53a3435 - rustc_mir::const_eval::eval_queries::const_eval_validated_provider::h98bdfd50fd8392b3
  33:     0x7f62b664d988 - rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::const_eval_validated>::compute::he4d9d5d8296e782d
  34:     0x7f62b6827323 - rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl::h17ccf27999cdbfda
  35:     0x7f62b650de78 - rustc_data_structures::stack::ensure_sufficient_stack::hc7371369bc18827b
  36:     0x7f62b66ae4ec - rustc_query_system::query::plumbing::get_query_impl::h15cc98afa5331b5b
  37:     0x7f62b65ca3bc - rustc_middle::mir::interpret::queries::<impl rustc_middle::ty::context::TyCtxt>::const_eval_global_id::hfa304b68111680d4
  38:     0x7f62b65ca106 - rustc_middle::mir::interpret::queries::<impl rustc_middle::ty::context::TyCtxt>::const_eval_resolve::hb1504079523452e5
  39:     0x7f62b6062576 - <rustc_trait_selection::traits::project::AssocTypeNormalizer as rustc_middle::ty::fold::TypeFolder>::fold_const::h65300d88b63174b3
  40:     0x7f62b5f85dd3 - rustc_middle::ty::structural_impls::<impl rustc_middle::ty::fold::TypeFoldable for &rustc_middle::ty::TyS>::super_fold_with::he97e902ca453e8c0
  41:     0x7f62b6061d6e - <rustc_trait_selection::traits::project::AssocTypeNormalizer as rustc_middle::ty::fold::TypeFolder>::fold_ty::hee19f5e41aedb6b5
  42:     0x7f62b499ca0a - rustc_data_structures::stack::ensure_sufficient_stack::hbe260e288157ed57
  43:     0x7f62b4bf9000 - rustc_trait_selection::traits::project::normalize::h5613c8bfc5d74e91
  44:     0x7f62b4ae185a - rustc_typeck::check::Inherited::normalize_associated_types_in::hca1c0f4febcd9d20
  45:     0x7f62b4c31e72 - <alloc::vec::Vec<T> as alloc::vec::SpecExtend<T,I>>::from_iter::h2e262052cec849ed
  46:     0x7f62b4addcb8 - rustc_typeck::check::InheritedBuilder::enter::h82ba0d79645e3160
  47:     0x7f62b49f5d01 - rustc_typeck::check::wfcheck::check_item_well_formed::hee3ec82e08558fbf
  48:     0x7f62b4947a4e - rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::check_item_well_formed>::compute::h2ec5d177707c5676
  49:     0x7f62b496f260 - rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl::h9a8f7b2c07d7db3d
  50:     0x7f62b4982a69 - rustc_data_structures::stack::ensure_sufficient_stack::h0d95f890c0ba21cd
  51:     0x7f62b4bbe0aa - rustc_query_system::query::plumbing::get_query_impl::haac35b1fc122feea
  52:     0x7f62b4beb36e - rustc_query_system::query::plumbing::ensure_query_impl::hfe7107aa10bc6206
  53:     0x7f62b4b2bedf - <std::panic::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::h4a1ab70d40d9ace6
  54:     0x7f62b4c576c0 - rustc_hir::hir::Crate::par_visit_all_item_likes::hfb0c04483e676c08
  55:     0x7f62b4b560f8 - rustc_session::session::Session::track_errors::hf65fd8ea70fab05a
  56:     0x7f62b4b257ad - rustc_typeck::check_crate::h129f49e683dec6ca
  57:     0x7f62b43a5d7b - rustc_interface::passes::analysis::haed903c33956c28b
  58:     0x7f62b3ea0d92 - rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::analysis>::compute::h407a9953b5b74ba9
  59:     0x7f62b3ebc2a5 - rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl::he7b6136bd92b8766
  60:     0x7f62b3ea1e25 - rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query::{{closure}}::{{closure}}::{{closure}}::hec9f59b817102522
  61:     0x7f62b3eb62fb - rustc_query_system::query::plumbing::get_query_impl::h42739219882a3165
  62:     0x7f62b3ea4095 - rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter::h136cd37fe00c7049
  63:     0x7f62b402d96d - rustc_span::with_source_map::hdfa547cd4d1341a2
  64:     0x7f62b3ea5038 - rustc_interface::interface::create_compiler_and_run::h10b475d531695c0e
  65:     0x7f62b4038bfd - std::sys_common::backtrace::__rust_begin_short_backtrace::h4c9162f49c0dc935
  66:     0x7f62b403b9be - core::ops::function::FnOnce::call_once{{vtable.shim}}::hbba71a1842b71242
  67:     0x7f62b2f8ec3a - std::sys::unix::thread::Thread::new::thread_start::hdc96d124dc384f80
  68:     0x7f62afd8d422 - start_thread
  69:     0x7f62b2d90bf3 - __clone
  70:                0x0 - <unknown>

note: the compiler unexpectedly panicked. this is a bug.

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 1.47.0-dev running on x86_64-unknown-linux-gnu

query stack during panic:
#0 [const_eval_raw] const-evaluating `ArithArrayLen::0::{{constant}}#0`
#1 [const_eval_validated] const-evaluating + checking `ArithArrayLen::0::{{constant}}#0`
#2 [const_eval_validated] const-evaluating + checking `ArithArrayLen::0::{{constant}}#0`
#3 [check_item_well_formed] checking that `ArithArrayLen` is well-formed
#4 [analysis] running analysis passes on this crate
end of query stack
error: internal compiler error: src/librustc_middle/ty/subst.rs:569:17: const parameter `CFG/#0` (Const { ty: Config, val: Param(CFG/#0) }/0) out of range when substituting substs=[]

thread 'rustc' panicked at 'Box<Any>', /home/matthias/vcs/github/rust/library/std/src/macros.rs:13:23
stack backtrace:
   0:     0x7f62b2fb3d91 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h9a65342185cb7022
   1:     0x7f62b30222cd - core::fmt::write::hc3de054a6627b208
   2:     0x7f62b2f93ab3 - std::io::Write::write_fmt::h64bd8d8dca95fd5c
   3:     0x7f62b2f8cb10 - std::panicking::default_hook::{{closure}}::ha9c6947a872dc513
   4:     0x7f62b2f8c74d - std::panicking::default_hook::h3e5e46d076456208
   5:     0x7f62b4071269 - rustc_driver::report_ice::he0572c9ff71e0a8c
   6:     0x7f62b2f8d156 - std::panicking::rust_panic_with_hook::h30c558028146672c
   7:     0x7f62b652656d - std::panicking::begin_panic::{{closure}}::h96c5d8b23c10b36a
   8:     0x7f62b6526356 - std::sys_common::backtrace::__rust_end_short_backtrace::h98f679cf3c561f3c
   9:     0x7f62b633111f - std::panicking::begin_panic::h65c51a53a81437fd
  10:     0x7f62b669cbec - rustc_errors::HandlerInner::span_bug::ha07457fa25949e84
  11:     0x7f62b669d2f0 - rustc_errors::Handler::span_bug::hbb74711f3db8ebf3
  12:     0x7f62b6624018 - rustc_middle::util::bug::opt_span_bug_fmt::{{closure}}::h4a7f07794a96b9b2
  13:     0x7f62b660a703 - rustc_middle::ty::context::tls::with_opt::{{closure}}::h19e60cd4fc7d8059
  14:     0x7f62b660a669 - rustc_middle::ty::context::tls::with_opt::h346f3e655bc513dc
  15:     0x7f62b6623f17 - rustc_middle::util::bug::opt_span_bug_fmt::h35bf29c4eb538873
  16:     0x7f62b6623ed1 - rustc_middle::util::bug::span_bug_fmt::h280140fbfd3b6cca
  17:     0x7f62b65f48a3 - <rustc_middle::ty::subst::SubstFolder as rustc_middle::ty::fold::TypeFolder>::fold_const::h7a50de3c95311e03
  18:     0x7f62b5544add - rustc_middle::ty::normalize_erasing_regions::<impl rustc_middle::ty::context::TyCtxt>::subst_and_normalize_erasing_regions::h79e6d568f2bee0ca
  19:     0x7f62b5273fbb - rustc_mir::interpret::operand::<impl rustc_mir::interpret::eval_context::InterpCx<M>>::eval_operand::hccef71beb839ca33
  20:     0x7f62b529dcfc - rustc_mir::interpret::step::<impl rustc_mir::interpret::eval_context::InterpCx<M>>::eval_rvalue_into_place::hbc3e67db53b60802
  21:     0x7f62b5290dad - rustc_mir::interpret::step::<impl rustc_mir::interpret::eval_context::InterpCx<M>>::run::h4e302c3d25a3f08c
  22:     0x7f62b53a592f - rustc_mir::const_eval::eval_queries::const_eval_raw_provider::h105f922d09dd2652
  23:     0x7f62b5317524 - rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::const_eval_raw>::compute::h04b2e5889c7d6d53
  24:     0x7f62b5174949 - rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl::h3dd8792e6d237967
  25:     0x7f62b532777e - rustc_data_structures::stack::ensure_sufficient_stack::h2228541d95921492
  26:     0x7f62b5575cb3 - rustc_query_system::query::plumbing::get_query_impl::h240b503fbcb2e001
  27:     0x7f62b53a3677 - rustc_mir::const_eval::eval_queries::const_eval_validated_provider::h98bdfd50fd8392b3
  28:     0x7f62b5318274 - rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::const_eval_validated>::compute::he4d9d5d8296e782d
  29:     0x7f62b51814a9 - rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl::hc6404f0b5657110e
  30:     0x7f62b53264ee - rustc_data_structures::stack::ensure_sufficient_stack::h0172bed68fd28962
  31:     0x7f62b5596e2c - rustc_query_system::query::plumbing::get_query_impl::h6cf806f9a2b220d0
  32:     0x7f62b53a3435 - rustc_mir::const_eval::eval_queries::const_eval_validated_provider::h98bdfd50fd8392b3
  33:     0x7f62b664d988 - rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::const_eval_validated>::compute::he4d9d5d8296e782d
  34:     0x7f62b6827323 - rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl::h17ccf27999cdbfda
  35:     0x7f62b650de78 - rustc_data_structures::stack::ensure_sufficient_stack::hc7371369bc18827b
  36:     0x7f62b66ae4ec - rustc_query_system::query::plumbing::get_query_impl::h15cc98afa5331b5b
  37:     0x7f62b65ca3bc - rustc_middle::mir::interpret::queries::<impl rustc_middle::ty::context::TyCtxt>::const_eval_global_id::hfa304b68111680d4
  38:     0x7f62b65ca106 - rustc_middle::mir::interpret::queries::<impl rustc_middle::ty::context::TyCtxt>::const_eval_resolve::hb1504079523452e5
  39:     0x7f62b6062576 - <rustc_trait_selection::traits::project::AssocTypeNormalizer as rustc_middle::ty::fold::TypeFolder>::fold_const::h65300d88b63174b3
  40:     0x7f62b5f85dd3 - rustc_middle::ty::structural_impls::<impl rustc_middle::ty::fold::TypeFoldable for &rustc_middle::ty::TyS>::super_fold_with::he97e902ca453e8c0
  41:     0x7f62b6061d6e - <rustc_trait_selection::traits::project::AssocTypeNormalizer as rustc_middle::ty::fold::TypeFolder>::fold_ty::hee19f5e41aedb6b5
  42:     0x7f62b499ca0a - rustc_data_structures::stack::ensure_sufficient_stack::hbe260e288157ed57
  43:     0x7f62b4bf9000 - rustc_trait_selection::traits::project::normalize::h5613c8bfc5d74e91
  44:     0x7f62b4ae185a - rustc_typeck::check::Inherited::normalize_associated_types_in::hca1c0f4febcd9d20
  45:     0x7f62b4c31e72 - <alloc::vec::Vec<T> as alloc::vec::SpecExtend<T,I>>::from_iter::h2e262052cec849ed
  46:     0x7f62b4addcb8 - rustc_typeck::check::InheritedBuilder::enter::h82ba0d79645e3160
  47:     0x7f62b49f5d01 - rustc_typeck::check::wfcheck::check_item_well_formed::hee3ec82e08558fbf
  48:     0x7f62b4947a4e - rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::check_item_well_formed>::compute::h2ec5d177707c5676
  49:     0x7f62b496f260 - rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl::h9a8f7b2c07d7db3d
  50:     0x7f62b4982a69 - rustc_data_structures::stack::ensure_sufficient_stack::h0d95f890c0ba21cd
  51:     0x7f62b4bbe0aa - rustc_query_system::query::plumbing::get_query_impl::haac35b1fc122feea
  52:     0x7f62b4beb36e - rustc_query_system::query::plumbing::ensure_query_impl::hfe7107aa10bc6206
  53:     0x7f62b4b2bedf - <std::panic::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::h4a1ab70d40d9ace6
  54:     0x7f62b4c576c0 - rustc_hir::hir::Crate::par_visit_all_item_likes::hfb0c04483e676c08
  55:     0x7f62b4b560f8 - rustc_session::session::Session::track_errors::hf65fd8ea70fab05a
  56:     0x7f62b4b257ad - rustc_typeck::check_crate::h129f49e683dec6ca
  57:     0x7f62b43a5d7b - rustc_interface::passes::analysis::haed903c33956c28b
  58:     0x7f62b3ea0d92 - rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::analysis>::compute::h407a9953b5b74ba9
  59:     0x7f62b3ebc2a5 - rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl::he7b6136bd92b8766
  60:     0x7f62b3ea1e25 - rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query::{{closure}}::{{closure}}::{{closure}}::hec9f59b817102522
  61:     0x7f62b3eb62fb - rustc_query_system::query::plumbing::get_query_impl::h42739219882a3165
  62:     0x7f62b3ea4095 - rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter::h136cd37fe00c7049
  63:     0x7f62b402d96d - rustc_span::with_source_map::hdfa547cd4d1341a2
  64:     0x7f62b3ea5038 - rustc_interface::interface::create_compiler_and_run::h10b475d531695c0e
  65:     0x7f62b4038bfd - std::sys_common::backtrace::__rust_begin_short_backtrace::h4c9162f49c0dc935
  66:     0x7f62b403b9be - core::ops::function::FnOnce::call_once{{vtable.shim}}::hbba71a1842b71242
  67:     0x7f62b2f8ec3a - std::sys::unix::thread::Thread::new::thread_start::hdc96d124dc384f80
  68:     0x7f62afd8d422 - start_thread
  69:     0x7f62b2d90bf3 - __clone
  70:                0x0 - <unknown>

note: the compiler unexpectedly panicked. this is a bug.

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 1.47.0-dev running on x86_64-unknown-linux-gnu

query stack during panic:
#0 [const_eval_raw] const-evaluating `B::arr::{{constant}}#0`
#1 [const_eval_validated] const-evaluating + checking `B::arr::{{constant}}#0`
#2 [const_eval_validated] const-evaluating + checking `B::arr::{{constant}}#0`
#3 [check_item_well_formed] checking that `B` is well-formed
#4 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 4 previous errors

For more information about this error, try `rustc --explain E0658`.

[lcnr]

this is pretty much a duplicate of #69913, we will hopefully be able to prevent these ICE on stable soon