ICE: panicked at 'already borrowed: BorrowMutError' and thread panicked while panicking. aborting.

[chengniansun]

Code

type PairCoupledTypes: Trait<
    [u32; {
        static FOO: usize;
    }],
> = impl Trait<
    [u32; {
        static FOO: usize;
    }],
>;

Meta

rustc --version --verbose:

rustc 1.53.0-nightly (07e0e2ec2 2021-03-24)
binary: rustc
commit-hash: 07e0e2ec268c140e607e1ac7f49f145612d0f597
commit-date: 2021-03-24
host: x86_64-unknown-linux-gnu
release: 1.53.0-nightly
LLVM version: 12.0.0

Error output

error: bounds on `type`s in this context have no effect
 --> perses_node_priority_with_dfs_delta_reduced_mutant.rs:1:24
  |
1 |   type PairCoupledTypes: Trait<
  |  ________________________^
2 | |     [u32; {
3 | |         static FOO: usize;
4 | |     }],
5 | | > = impl Trait<
  | |_^

error: free static item without body
 --> perses_node_priority_with_dfs_delta_reduced_mutant.rs:3:9
  |
3 |         static FOO: usize;
  |         ^^^^^^^^^^^^^^^^^-
  |                          |
  |                          help: provide a definition for the static: `= <expr>;`

error: free static item without body
 --> perses_node_priority_with_dfs_delta_reduced_mutant.rs:7:9
  |
7 |         static FOO: usize;
  |         ^^^^^^^^^^^^^^^^^-
  |                          |
  |                          help: provide a definition for the static: `= <expr>;`

error[E0405]: cannot find trait `Trait` in this scope
 --> perses_node_priority_with_dfs_delta_reduced_mutant.rs:1:24
  |
1 | type PairCoupledTypes: Trait<
  |                        ^^^^^ not found in this scope

error[E0405]: cannot find trait `Trait` in this scope
 --> perses_node_priority_with_dfs_delta_reduced_mutant.rs:5:10
  |
5 | > = impl Trait<
  |          ^^^^^ not found in this scope

error[E0658]: `impl Trait` in type aliases is unstable
 --> perses_node_priority_with_dfs_delta_reduced_mutant.rs:5:5
  |
5 |   > = impl Trait<
  |  _____^
6 | |     [u32; {
7 | |         static FOO: usize;
8 | |     }],
9 | | >;
  | |_^
  |
  = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
  = help: add `#![feature(min_type_alias_impl_trait)]` to the crate attributes to enable

thread 'rustc' panicked at 'called `Option::unwrap()` on a `None` value', compiler/rustc_middle/src/hir/map/collector.rs:156:78
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

error: internal compiler error: unexpected panic

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 1.53.0-nightly (07e0e2ec2 2021-03-24) running on x86_64-unknown-linux-gnu

query stack during panic:
thread 'rustc' panicked at 'already borrowed: BorrowMutError', /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/compiler/rustc_data_structures/src/sync.rs:481:16
stack backtrace:
   0:     0x7fd27e03ff80 - std::backtrace_rs::backtrace::libunwind::trace::h4dee703919bfd40a
                               at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/std/src/../../backtrace/src/backtrace/libunwind.rs:90:5
   1:     0x7fd27e03ff80 - std::backtrace_rs::backtrace::trace_unsynchronized::h457e839f1a563e20
                               at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7fd27e03ff80 - std::sys_common::backtrace::_print_fmt::h86a55fb30f8393c8
                               at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/std/src/sys_common/backtrace.rs:67:5
   3:     0x7fd27e03ff80 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h7b3d6cac46d277e1
                               at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/std/src/sys_common/backtrace.rs:46:22
   4:     0x7fd27e0ae8df - core::fmt::write::h127419eb46f2ecc9
                               at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/core/src/fmt/mod.rs:1092:17
   5:     0x7fd27e034505 - std::io::Write::write_fmt::h6010cfbb4726588b
                               at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/std/src/io/mod.rs:1578:15
   6:     0x7fd27e043cbb - std::sys_common::backtrace::_print::h79b4f9652330cc9d
                               at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/std/src/sys_common/backtrace.rs:49:5
   7:     0x7fd27e043cbb - std::sys_common::backtrace::print::h330bb326a76af8cf
                               at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/std/src/sys_common/backtrace.rs:36:9
   8:     0x7fd27e043cbb - std::panicking::default_hook::{{closure}}::heb6a42a7d50a472e
                               at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/std/src/panicking.rs:208:50
   9:     0x7fd27e043783 - std::panicking::default_hook::h17e521ba6d68d6e1
                               at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/std/src/panicking.rs:225:9
  10:     0x7fd27e815f2b - rustc_driver::report_ice::ha40982d59fc75b99
  11:     0x7fd27e0443d0 - std::panicking::rust_panic_with_hook::h70db735e3a6e70cb
                               at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/std/src/panicking.rs:595:17
  12:     0x7fd27e043fa7 - std::panicking::begin_panic_handler::{{closure}}::h777c71c8e5a7e25c
                               at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/std/src/panicking.rs:497:13
  13:     0x7fd27e04043c - std::sys_common::backtrace::__rust_end_short_backtrace::h3e9bf30168899554
                               at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/std/src/sys_common/backtrace.rs:141:18
  14:     0x7fd27e043f09 - rust_begin_unwind
                               at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/std/src/panicking.rs:493:5
  15:     0x7fd27e00af31 - core::panicking::panic_fmt::h5322a082d19786c3
                               at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/core/src/panicking.rs:92:14
  16:     0x7fd27e00ae23 - core::option::expect_none_failed::h354eaa93a51d71b8
                               at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/core/src/option.rs:1329:5
  17:     0x7fd27fd7d6b1 - rustc_query_system::query::plumbing::get_query_impl::h9285eb59969e22c8
  18:     0x7fd27fddd43f - <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::hir_owner::h8cf23765d3e4de6b
  19:     0x7fd2803ebcd9 - rustc_middle::hir::map::Map::find_entry::h29d0e05ce7362da9
  20:     0x7fd2803ee781 - rustc_middle::hir::map::Map::opt_span::h0e633ec6695201db
  21:     0x7fd2803e5bb4 - core::ops::function::FnOnce::call_once::h8e8fc2e78b42ea40
  22:     0x7fd27fdf5fef - rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl::heb66790eab05aa9c
  23:     0x7fd27fd9edc6 - rustc_query_system::query::plumbing::force_query_with_job::hd99723bfec38226e
  24:     0x7fd27fd681aa - rustc_query_system::query::plumbing::get_query_impl::h29f54ecbf531e372
  25:     0x7fd27fddf2ca - <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::def_span::hf8951f7e9bd1bf9c
  26:     0x7fd27ee23f40 - <rustc_span::def_id::DefId as rustc_query_impl::keys::Key>::default_span::h1c3c7dc090c3f014
  27:     0x7fd27ee23e68 - <rustc_span::def_id::LocalDefId as rustc_query_impl::keys::Key>::default_span::heda70f45b0543b34
  28:     0x7fd27ef9f123 - rustc_query_impl::make_query::hir_owner::h3da83ab69db93eaa
  29:     0x7fd27f03f777 - <core::iter::adapters::map::Map<I,F> as core::iter::traits::iterator::Iterator>::fold::hd1991837c2161eb2
  30:     0x7fd27f01bd2e - <hashbrown::map::HashMap<K,V,S,A> as core::iter::traits::collect::Extend<(K,V)>>::extend::hd6666d2b93c8a6ad
  31:     0x7fd27ed91619 - rustc_query_system::query::plumbing::QueryState<D,K>::try_collect_active_jobs::h9e1d046a9d6f2a48
  32:     0x7fd27eed6215 - rustc_query_impl::Queries::try_collect_active_jobs::hde35c82843c1c977
  33:     0x7fd27ef9de10 - <rustc_query_impl::plumbing::QueryCtxt as rustc_query_system::query::QueryContext>::try_collect_active_jobs::h074fbdf881b5d394
  34:     0x7fd27edf4efc - rustc_query_system::query::job::print_query_stack::hc8bd6fa9da6896ed
  35:     0x7fd27e8e8018 - rustc_interface::interface::try_print_query_stack::h52edfe36792d8caa
  36:     0x7fd27e816338 - rustc_driver::report_ice::ha40982d59fc75b99
  37:     0x7fd27e0443d0 - std::panicking::rust_panic_with_hook::h70db735e3a6e70cb
                               at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/std/src/panicking.rs:595:17
  38:     0x7fd27e043f77 - std::panicking::begin_panic_handler::{{closure}}::h777c71c8e5a7e25c
                               at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/std/src/panicking.rs:495:13
  39:     0x7fd27e04043c - std::sys_common::backtrace::__rust_end_short_backtrace::h3e9bf30168899554
                               at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/std/src/sys_common/backtrace.rs:141:18
  40:     0x7fd27e043f09 - rust_begin_unwind
                               at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/std/src/panicking.rs:493:5
  41:     0x7fd27e00af31 - core::panicking::panic_fmt::h5322a082d19786c3
                               at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/core/src/panicking.rs:92:14
  42:     0x7fd27e00ae7d - core::panicking::panic::haebb15b6842d6229
                               at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/core/src/panicking.rs:50:5
  43:     0x7fd2803848f3 - rustc_middle::hir::map::collector::NodeCollector::finalize_and_compute_crate_hash::ha4f7aa4c32ef1fb5
  44:     0x7fd280d97e48 - rustc_middle::hir::map::index_hir::h8d13710fbf6ecbc7
  45:     0x7fd280909f75 - rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl::hb443d6bb581e91b6
  46:     0x7fd280966f17 - rustc_data_structures::stack::ensure_sufficient_stack::he0c6c8cfc8bd647a
  47:     0x7fd28083d5c1 - rustc_query_system::query::plumbing::force_query_with_job::h961a1a8f48ff034b
  48:     0x7fd2807f09af - rustc_query_system::query::plumbing::get_query_impl::h5cd26487eff2131e
  49:     0x7fd2808e35cf - <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::index_hir::hf2b2ac559a14a0d9
  50:     0x7fd2803e6487 - core::ops::function::FnOnce::call_once::hff88764e303a68c4
  51:     0x7fd27fdf30b5 - rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl::hc0460b29df8a668f
  52:     0x7fd27fd997ee - rustc_query_system::query::plumbing::force_query_with_job::h8d24115ee3a536a8
  53:     0x7fd27fd7d390 - rustc_query_system::query::plumbing::get_query_impl::h9285eb59969e22c8
  54:     0x7fd27fddd43f - <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::hir_owner::h8cf23765d3e4de6b
  55:     0x7fd2803ebcd9 - rustc_middle::hir::map::Map::find_entry::h29d0e05ce7362da9
  56:     0x7fd2803ec136 - <rustc_middle::hir::map::Map as rustc_hir::intravisit::Map>::item::h5a1c6a1d862795bc
  57:     0x7fd27fe7c2c0 - rustc_middle::hir::map::Map::visit_item_likes_in_module::hf01ac21b956183d6
  58:     0x7fd2809c6294 - rustc_passes::hir_id_validator::check_crate::hb29522cb7117c68c
  59:     0x7fd28048ff76 - rustc_interface::passes::analysis::h84e230aa18168bec
  60:     0x7fd2809076b5 - rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl::ha9ecb0a4a5f74d0a
  61:     0x7fd280969b87 - rustc_data_structures::stack::ensure_sufficient_stack::hfc73cb57dd5c4995
  62:     0x7fd280834161 - rustc_query_system::query::plumbing::force_query_with_job::h3b03867f47f56f3f
  63:     0x7fd28080aeff - rustc_query_system::query::plumbing::get_query_impl::hb5cdf9a8bb6380d7
  64:     0x7fd2808e372f - <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::analysis::he7fb436d5ea44844
  65:     0x7fd28047da6b - rustc_interface::passes::QueryContext::enter::h6632cc7bc285eb19
  66:     0x7fd280449425 - rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter::h2731ac3c02105c7c
  67:     0x7fd28047e071 - rustc_span::with_source_map::h94d38a1c3089ae35
  68:     0x7fd28044a3ee - rustc_interface::interface::create_compiler_and_run::h2bc2789fb7dc8d5b
  69:     0x7fd280444b78 - scoped_tls::ScopedKey<T>::set::hc4c30e2561747f9c
  70:     0x7fd28044a7c4 - std::sys_common::backtrace::__rust_begin_short_backtrace::h904e8f4f3fa6a302
  71:     0x7fd28046c0f5 - core::ops::function::FnOnce::call_once{{vtable.shim}}::he1a228660be11f81
  72:     0x7fd27e053cf3 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h7f7bdfc757a1add0
                               at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/alloc/src/boxed.rs:1546:9
  73:     0x7fd27e053cf3 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::ha294ad0fb99e9b3a
                               at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/alloc/src/boxed.rs:1546:9
  74:     0x7fd27e053cf3 - std::sys::unix::thread::Thread::new::thread_start::h4614854ae73cd6b0
                               at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/std/src/sys/unix/thread.rs:71:17
  75:     0x7fd27df7e609 - start_thread
  76:     0x7fd27de92293 - clone
  77:                0x0 - <unknown>

error: internal compiler error: unexpected panic

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 1.53.0-nightly (07e0e2ec2 2021-03-24) running on x86_64-unknown-linux-gnu

query stack during panic:
end of query stack
thread panicked while panicking. aborting.
Illegal instruction (core dumped)

Backtrace

``` error: bounds on `type`s in this context have no effect --> perses_node_priority_with_dfs_delta_reduced_mutant.rs:1:24 | 1 | type PairCoupledTypes: Trait< | ________________________^ 2 | | [u32; { 3 | | static FOO: usize; 4 | | }], 5 | | > = impl Trait< | |_^ error: free static item without body --> perses_node_priority_with_dfs_delta_reduced_mutant.rs:3:9 | 3 | static FOO: usize; | ^^^^^^^^^^^^^^^^^- | | | help: provide a definition for the static: `= ;` error: free static item without body --> perses_node_priority_with_dfs_delta_reduced_mutant.rs:7:9 | 7 | static FOO: usize; | ^^^^^^^^^^^^^^^^^- | | | help: provide a definition for the static: `= ;` error[E0405]: cannot find trait `Trait` in this scope --> perses_node_priority_with_dfs_delta_reduced_mutant.rs:1:24 | 1 | type PairCoupledTypes: Trait< | ^^^^^ not found in this scope error[E0405]: cannot find trait `Trait` in this scope --> perses_node_priority_with_dfs_delta_reduced_mutant.rs:5:10 | 5 | > = impl Trait< | ^^^^^ not found in this scope error[E0658]: `impl Trait` in type aliases is unstable --> perses_node_priority_with_dfs_delta_reduced_mutant.rs:5:5 | 5 | > = impl Trait< | _____^ 6 | | [u32; { 7 | | static FOO: usize; 8 | | }], 9 | | >; | |_^ | = note: see issue #63063 for more information = help: add `#![feature(min_type_alias_impl_trait)]` to the crate attributes to enable thread 'rustc' panicked at 'called `Option::unwrap()` on a `None` value', compiler/rustc_middle/src/hir/map/collector.rs:156:78 stack backtrace: 0: rust_begin_unwind at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/std/src/panicking.rs:493:5 1: core::panicking::panic_fmt at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/core/src/panicking.rs:92:14 2: core::panicking::panic at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/core/src/panicking.rs:50:5 3: rustc_middle::hir::map::collector::NodeCollector::finalize_and_compute_crate_hash 4: rustc_middle::hir::map::index_hir 5: rustc_query_system::dep_graph::graph::DepGraph::with_task_impl 6: rustc_data_structures::stack::ensure_sufficient_stack 7: rustc_query_system::query::plumbing::force_query_with_job 8: rustc_query_system::query::plumbing::get_query_impl 9: ::index_hir 10: core::ops::function::FnOnce::call_once 11: rustc_query_system::dep_graph::graph::DepGraph::with_task_impl 12: rustc_query_system::query::plumbing::force_query_with_job 13: rustc_query_system::query::plumbing::get_query_impl 14: ::hir_owner 15: rustc_middle::hir::map::Map::find_entry 16: ::item 17: rustc_middle::hir::map::Map::visit_item_likes_in_module 18: rustc_passes::hir_id_validator::check_crate 19: rustc_interface::passes::analysis 20: rustc_query_system::dep_graph::graph::DepGraph::with_task_impl 21: rustc_data_structures::stack::ensure_sufficient_stack 22: rustc_query_system::query::plumbing::force_query_with_job 23: rustc_query_system::query::plumbing::get_query_impl 24: ::analysis 25: rustc_interface::passes::QueryContext::enter 26: rustc_interface::queries::::enter 27: rustc_span::with_source_map 28: rustc_interface::interface::create_compiler_and_run 29: scoped_tls::ScopedKey::set note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace. error: internal compiler error: unexpected panic 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 1.53.0-nightly (07e0e2ec2 2021-03-24) running on x86_64-unknown-linux-gnu query stack during panic: thread 'rustc' panicked at 'already borrowed: BorrowMutError', /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/compiler/rustc_data_structures/src/sync.rs:481:16 stack backtrace: 0: 0x7f249c32ff80 - std::backtrace_rs::backtrace::libunwind::trace::h4dee703919bfd40a at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/std/src/../../backtrace/src/backtrace/libunwind.rs:90:5 1: 0x7f249c32ff80 - std::backtrace_rs::backtrace::trace_unsynchronized::h457e839f1a563e20 at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5 2: 0x7f249c32ff80 - std::sys_common::backtrace::_print_fmt::h86a55fb30f8393c8 at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/std/src/sys_common/backtrace.rs:67:5 3: 0x7f249c32ff80 - ::fmt::h7b3d6cac46d277e1 at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/std/src/sys_common/backtrace.rs:46:22 4: 0x7f249c39e8df - core::fmt::write::h127419eb46f2ecc9 at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/core/src/fmt/mod.rs:1092:17 5: 0x7f249c324505 - std::io::Write::write_fmt::h6010cfbb4726588b at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/std/src/io/mod.rs:1578:15 6: 0x7f249c333cbb - std::sys_common::backtrace::_print::h79b4f9652330cc9d at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/std/src/sys_common/backtrace.rs:49:5 7: 0x7f249c333cbb - std::sys_common::backtrace::print::h330bb326a76af8cf at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/std/src/sys_common/backtrace.rs:36:9 8: 0x7f249c333cbb - std::panicking::default_hook::{{closure}}::heb6a42a7d50a472e at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/std/src/panicking.rs:208:50 9: 0x7f249c333783 - std::panicking::default_hook::h17e521ba6d68d6e1 at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/std/src/panicking.rs:225:9 10: 0x7f249cb05f2b - rustc_driver::report_ice::ha40982d59fc75b99 11: 0x7f249c3343d0 - std::panicking::rust_panic_with_hook::h70db735e3a6e70cb at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/std/src/panicking.rs:595:17 12: 0x7f249c333fa7 - std::panicking::begin_panic_handler::{{closure}}::h777c71c8e5a7e25c at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/std/src/panicking.rs:497:13 13: 0x7f249c33043c - std::sys_common::backtrace::__rust_end_short_backtrace::h3e9bf30168899554 at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/std/src/sys_common/backtrace.rs:141:18 14: 0x7f249c333f09 - rust_begin_unwind at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/std/src/panicking.rs:493:5 15: 0x7f249c2faf31 - core::panicking::panic_fmt::h5322a082d19786c3 at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/core/src/panicking.rs:92:14 16: 0x7f249c2fae23 - core::option::expect_none_failed::h354eaa93a51d71b8 at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/core/src/option.rs:1329:5 17: 0x7f249e06d6b1 - rustc_query_system::query::plumbing::get_query_impl::h9285eb59969e22c8 18: 0x7f249e0cd43f - ::hir_owner::h8cf23765d3e4de6b 19: 0x7f249e6dbcd9 - rustc_middle::hir::map::Map::find_entry::h29d0e05ce7362da9 20: 0x7f249e6de781 - rustc_middle::hir::map::Map::opt_span::h0e633ec6695201db 21: 0x7f249e6d5bb4 - core::ops::function::FnOnce::call_once::h8e8fc2e78b42ea40 22: 0x7f249e0e5fef - rustc_query_system::dep_graph::graph::DepGraph::with_task_impl::heb66790eab05aa9c 23: 0x7f249e08edc6 - rustc_query_system::query::plumbing::force_query_with_job::hd99723bfec38226e 24: 0x7f249e0581aa - rustc_query_system::query::plumbing::get_query_impl::h29f54ecbf531e372 25: 0x7f249e0cf2ca - ::def_span::hf8951f7e9bd1bf9c 26: 0x7f249d113f40 - ::default_span::h1c3c7dc090c3f014 27: 0x7f249d113e68 - ::default_span::heda70f45b0543b34 28: 0x7f249d28f123 - rustc_query_impl::make_query::hir_owner::h3da83ab69db93eaa 29: 0x7f249d32f777 - as core::iter::traits::iterator::Iterator>::fold::hd1991837c2161eb2 30: 0x7f249d30bd2e - as core::iter::traits::collect::Extend<(K,V)>>::extend::hd6666d2b93c8a6ad 31: 0x7f249d081619 - rustc_query_system::query::plumbing::QueryState::try_collect_active_jobs::h9e1d046a9d6f2a48 32: 0x7f249d1c6215 - rustc_query_impl::Queries::try_collect_active_jobs::hde35c82843c1c977 33: 0x7f249d28de10 - ::try_collect_active_jobs::h074fbdf881b5d394 34: 0x7f249d0e4efc - rustc_query_system::query::job::print_query_stack::hc8bd6fa9da6896ed 35: 0x7f249cbd8018 - rustc_interface::interface::try_print_query_stack::h52edfe36792d8caa 36: 0x7f249cb06338 - rustc_driver::report_ice::ha40982d59fc75b99 37: 0x7f249c3343d0 - std::panicking::rust_panic_with_hook::h70db735e3a6e70cb at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/std/src/panicking.rs:595:17 38: 0x7f249c333f77 - std::panicking::begin_panic_handler::{{closure}}::h777c71c8e5a7e25c at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/std/src/panicking.rs:495:13 39: 0x7f249c33043c - std::sys_common::backtrace::__rust_end_short_backtrace::h3e9bf30168899554 at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/std/src/sys_common/backtrace.rs:141:18 40: 0x7f249c333f09 - rust_begin_unwind at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/std/src/panicking.rs:493:5 41: 0x7f249c2faf31 - core::panicking::panic_fmt::h5322a082d19786c3 at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/core/src/panicking.rs:92:14 42: 0x7f249c2fae7d - core::panicking::panic::haebb15b6842d6229 at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/core/src/panicking.rs:50:5 43: 0x7f249e6748f3 - rustc_middle::hir::map::collector::NodeCollector::finalize_and_compute_crate_hash::ha4f7aa4c32ef1fb5 44: 0x7f249f087e48 - rustc_middle::hir::map::index_hir::h8d13710fbf6ecbc7 45: 0x7f249ebf9f75 - rustc_query_system::dep_graph::graph::DepGraph::with_task_impl::hb443d6bb581e91b6 46: 0x7f249ec56f17 - rustc_data_structures::stack::ensure_sufficient_stack::he0c6c8cfc8bd647a 47: 0x7f249eb2d5c1 - rustc_query_system::query::plumbing::force_query_with_job::h961a1a8f48ff034b 48: 0x7f249eae09af - rustc_query_system::query::plumbing::get_query_impl::h5cd26487eff2131e 49: 0x7f249ebd35cf - ::index_hir::hf2b2ac559a14a0d9 50: 0x7f249e6d6487 - core::ops::function::FnOnce::call_once::hff88764e303a68c4 51: 0x7f249e0e30b5 - rustc_query_system::dep_graph::graph::DepGraph::with_task_impl::hc0460b29df8a668f 52: 0x7f249e0897ee - rustc_query_system::query::plumbing::force_query_with_job::h8d24115ee3a536a8 53: 0x7f249e06d390 - rustc_query_system::query::plumbing::get_query_impl::h9285eb59969e22c8 54: 0x7f249e0cd43f - ::hir_owner::h8cf23765d3e4de6b 55: 0x7f249e6dbcd9 - rustc_middle::hir::map::Map::find_entry::h29d0e05ce7362da9 56: 0x7f249e6dc136 - ::item::h5a1c6a1d862795bc 57: 0x7f249e16c2c0 - rustc_middle::hir::map::Map::visit_item_likes_in_module::hf01ac21b956183d6 58: 0x7f249ecb6294 - rustc_passes::hir_id_validator::check_crate::hb29522cb7117c68c 59: 0x7f249e77ff76 - rustc_interface::passes::analysis::h84e230aa18168bec 60: 0x7f249ebf76b5 - rustc_query_system::dep_graph::graph::DepGraph::with_task_impl::ha9ecb0a4a5f74d0a 61: 0x7f249ec59b87 - rustc_data_structures::stack::ensure_sufficient_stack::hfc73cb57dd5c4995 62: 0x7f249eb24161 - rustc_query_system::query::plumbing::force_query_with_job::h3b03867f47f56f3f 63: 0x7f249eafaeff - rustc_query_system::query::plumbing::get_query_impl::hb5cdf9a8bb6380d7 64: 0x7f249ebd372f - ::analysis::he7fb436d5ea44844 65: 0x7f249e76da6b - rustc_interface::passes::QueryContext::enter::h6632cc7bc285eb19 66: 0x7f249e739425 - rustc_interface::queries::::enter::h2731ac3c02105c7c 67: 0x7f249e76e071 - rustc_span::with_source_map::h94d38a1c3089ae35 68: 0x7f249e73a3ee - rustc_interface::interface::create_compiler_and_run::h2bc2789fb7dc8d5b 69: 0x7f249e734b78 - scoped_tls::ScopedKey::set::hc4c30e2561747f9c 70: 0x7f249e73a7c4 - std::sys_common::backtrace::__rust_begin_short_backtrace::h904e8f4f3fa6a302 71: 0x7f249e75c0f5 - core::ops::function::FnOnce::call_once{{vtable.shim}}::he1a228660be11f81 72: 0x7f249c343cf3 - as core::ops::function::FnOnce>::call_once::h7f7bdfc757a1add0 at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/alloc/src/boxed.rs:1546:9 73: 0x7f249c343cf3 - as core::ops::function::FnOnce>::call_once::ha294ad0fb99e9b3a at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/alloc/src/boxed.rs:1546:9 74: 0x7f249c343cf3 - std::sys::unix::thread::Thread::new::thread_start::h4614854ae73cd6b0 at /rustc/07e0e2ec268c140e607e1ac7f49f145612d0f597/library/std/src/sys/unix/thread.rs:71:17 75: 0x7f249c26e609 - start_thread 76: 0x7f249c182293 - clone 77: 0x0 - error: internal compiler error: unexpected panic 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 1.53.0-nightly (07e0e2ec2 2021-03-24) running on x86_64-unknown-linux-gnu query stack during panic: end of query stack thread panicked while panicking. aborting. Illegal instruction (core dumped) ```

[chengniansun]

A duplicate

mod a {
    pub mod b {
        pub mod c {
            pub struct S<T>;
        }
    }
}
macro_rules! import {
    ( $ p : path ) => {
        use $p;
    };
}
fn f1() {
    import! { a :: b :: c :: S < u8 > }
}
fn f2() {}
fn main() {}

[Alexendoo]

No longer ICEs since #89124

[JohnTitor]

The minimized second example fails to debug-assert here:

https://github.com/rust-lang/rust/blob/42983a28ab3c70728da7a9b932b667c978dd898d/compiler/rustc_ast_lowering/src/index.rs#L77

Backtrace

``` thread 'rustc' panicked at 'assertion failed: `(left == right)` left: `DefId(0:8)`, right: `DefId(0:9)`', compiler/rustc_ast_lowering/src/index.rs:77:9 stack backtrace: 0: rust_begin_unwind at ./library/std/src/panicking.rs:495:5 1: core::panicking::panic_fmt at ./library/core/src/panicking.rs:107:14 2: core::panicking::assert_failed_inner 3: core::panicking::assert_failed at ./library/core/src/panicking.rs:145:5 4: rustc_ast_lowering::index::NodeCollector::insert at ./compiler/rustc_ast_lowering/src/index.rs:77:9 5: ::visit_ty at ./compiler/rustc_ast_lowering/src/index.rs:257:9 6: rustc_hir::intravisit::walk_generic_args at ./compiler/rustc_hir/src/intravisit.rs:804:5 7: rustc_hir::intravisit::walk_path at ./compiler/rustc_hir/src/intravisit.rs:783:9 8: rustc_hir::intravisit::Visitor::visit_path at ./compiler/rustc_hir/src/intravisit.rs:478:9 9: rustc_hir::intravisit::walk_use at ./compiler/rustc_hir/src/intravisit.rs:687:5 10: rustc_hir::intravisit::Visitor::visit_use at ./compiler/rustc_hir/src/intravisit.rs:406:9 11: rustc_hir::intravisit::walk_item at ./compiler/rustc_hir/src/intravisit.rs:576:13 12: ::visit_item::{{closure}} at ./compiler/rustc_ast_lowering/src/index.rs:169:13 13: rustc_ast_lowering::index::NodeCollector::with_parent at ./compiler/rustc_ast_lowering/src/index.rs:108:9 14: ::visit_item at ./compiler/rustc_ast_lowering/src/index.rs:162:9 15: rustc_ast_lowering::index::index_hir at ./compiler/rustc_ast_lowering/src/index.rs:66:34 16: rustc_ast_lowering::LoweringContext::make_owner_info at ./compiler/rustc_ast_lowering/src/lib.rs:502:13 17: rustc_ast_lowering::LoweringContext::with_hir_id_owner at ./compiler/rustc_ast_lowering/src/lib.rs:465:20 18: ::visit_item at ./compiler/rustc_ast_lowering/src/item.rs:44:22 19: rustc_ast::visit::walk_stmt at ./compiler/rustc_ast/src/visit.rs:692:37 20: rustc_ast::visit::Visitor::visit_stmt at ./compiler/rustc_ast/src/visit.rs:103:9 21: rustc_ast::visit::walk_block at ./compiler/rustc_ast/src/visit.rs:686:5 22: rustc_ast::visit::Visitor::visit_block at ./compiler/rustc_ast/src/visit.rs:100:9 23: rustc_ast::visit::walk_fn at ./compiler/rustc_ast/src/visit.rs:637:13 24: ::visit_fn at ./compiler/rustc_ast_lowering/src/item.rs:68:18 25: rustc_ast::visit::walk_item at ./compiler/rustc_ast/src/visit.rs:291:13 26: ::visit_item::{{closure}} at ./compiler/rustc_ast_lowering/src/item.rs:55:22 27: rustc_ast_lowering::item::::with_parent_item_lifetime_defs at ./compiler/rustc_ast_lowering/src/item.rs:115:19 28: ::visit_item at ./compiler/rustc_ast_lowering/src/item.rs:49:9 29: rustc_ast::visit::walk_crate at ./compiler/rustc_ast/src/visit.rs:235:5 30: rustc_ast_lowering::LoweringContext::lower_crate at ./compiler/rustc_ast_lowering/src/lib.rs:396:9 31: rustc_ast_lowering::lower_crate at ./compiler/rustc_ast_lowering/src/lib.rs:297:5 32: rustc_interface::passes::lower_to_hir at ./compiler/rustc_interface/src/passes.rs:464:21 33: rustc_interface::passes::create_global_ctxt at ./compiler/rustc_interface/src/passes.rs:807:17 34: rustc_interface::queries::Queries::global_ctxt::{{closure}} at ./compiler/rustc_interface/src/queries.rs:226:16 35: rustc_interface::queries::Query::compute at ./compiler/rustc_interface/src/queries.rs:38:28 36: rustc_driver::run_compiler::{{closure}}::{{closure}} at ./compiler/rustc_driver/src/lib.rs:377:13 37: rustc_interface::queries::::enter at ./compiler/rustc_interface/src/queries.rs:390:19 38: rustc_driver::run_compiler::{{closure}} at ./compiler/rustc_driver/src/lib.rs:312:22 39: rustc_interface::interface::create_compiler_and_run::{{closure}} at ./compiler/rustc_interface/src/interface.rs:203:13 40: rustc_span::with_source_map at ./compiler/rustc_span/src/lib.rs:976:5 41: rustc_interface::interface::create_compiler_and_run at ./compiler/rustc_interface/src/interface.rs:197:5 42: rustc_interface::interface::run_compiler::{{closure}} at ./compiler/rustc_interface/src/interface.rs:219:12 43: rustc_interface::util::setup_callbacks_and_run_in_thread_pool_with_globals::{{closure}}::{{closure}} at ./compiler/rustc_interface/src/util.rs:145:13 44: scoped_tls::ScopedKey::set at .cargo/registry/src/github.com-1ecc6299db9ec823/scoped-tls-1.0.0/src/lib.rs:137:9 45: rustc_span::create_session_globals_then at ./compiler/rustc_span/src/lib.rs:109:5 46: rustc_interface::util::setup_callbacks_and_run_in_thread_pool_with_globals::{{closure}} at ./compiler/rustc_interface/src/util.rs:143:9 ```