ICE: `{OpaqueTypeKey { def_id: DefId .. `

[matthiaskrgr]

code:

#![feature(type_alias_impl_trait)]

#[derive(Copy, Clone)]
struct Foo((u32, u32));

fn main() {
    type T = impl Copy;
    let foo: T = Foo((1u32, 2u32));
    let x = move || {
        let x = move || {
        let Foo((a, b)) = foo;
    };
    };
}

Version information

rustc 1.79.0-nightly (463a11bef 2024-03-28)
binary: rustc
commit-hash: 463a11bef4d6378439afebf2a9543aef36ccf2c1
commit-date: 2024-03-28
host: x86_64-unknown-linux-gnu
release: 1.79.0-nightly
LLVM version: 18.1.2

Command:
/home/matthias/.rustup/toolchains/master/bin/rustc --edition=2021

Program output

warning: unused variable: `x`
  --> 8C6E9F300DC05B0119EFD44A9B65DCB8844EF8D4829A527B3FE069E16DF441EF.rs:10:9
   |
10 |     let x = move || {
   |         ^ help: if this is intentional, prefix it with an underscore: `_x`
   |
   = note: `#[warn(unused_variables)]` on by default

warning: unused variable: `x`
  --> 8C6E9F300DC05B0119EFD44A9B65DCB8844EF8D4829A527B3FE069E16DF441EF.rs:11:13
   |
11 |         let x = move || {
   |             ^ help: if this is intentional, prefix it with an underscore: `_x`
thread 'rustc' panicked at compiler/rustc_mir_build/src/build/expr/as_place.rs:253:31:
called `Option::unwrap()` on a `None` value
stack backtrace:
   0:     0x79d5135622a5 - std::backtrace_rs::backtrace::libunwind::trace::h7884d067d1055777
                               at /rustc/c9f8f3438a8134a413aa5d4903e0196e44e37bbc/library/std/src/../../backtrace/src/backtrace/libunwind.rs:105:5
   1:     0x79d5135622a5 - std::backtrace_rs::backtrace::trace_unsynchronized::h6bc4d647cdcfd833
                               at /rustc/c9f8f3438a8134a413aa5d4903e0196e44e37bbc/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x79d5135622a5 - std::sys_common::backtrace::_print_fmt::hde15b23869dacdeb
                               at /rustc/c9f8f3438a8134a413aa5d4903e0196e44e37bbc/library/std/src/sys_common/backtrace.rs:68:5
   3:     0x79d5135622a5 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h9a7c8ebfe0e5a9ea
                               at /rustc/c9f8f3438a8134a413aa5d4903e0196e44e37bbc/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x79d5135b364b - core::fmt::rt::Argument::fmt::h12ee69ff17c60b9e
                               at /rustc/c9f8f3438a8134a413aa5d4903e0196e44e37bbc/library/core/src/fmt/rt.rs:142:9
   5:     0x79d5135b364b - core::fmt::write::hafeb62294a20d279
                               at /rustc/c9f8f3438a8134a413aa5d4903e0196e44e37bbc/library/core/src/fmt/mod.rs:1153:17
   6:     0x79d513556e8f - std::io::Write::write_fmt::h83162bfc67f19d63
                               at /rustc/c9f8f3438a8134a413aa5d4903e0196e44e37bbc/library/std/src/io/mod.rs:1843:15
   7:     0x79d51356207e - std::sys_common::backtrace::_print::hd55ca7a5e2e3de7e
                               at /rustc/c9f8f3438a8134a413aa5d4903e0196e44e37bbc/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x79d51356207e - std::sys_common::backtrace::print::he94870e87e3768e8
                               at /rustc/c9f8f3438a8134a413aa5d4903e0196e44e37bbc/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x79d513564d29 - std::panicking::default_hook::{{closure}}::hd193b85d1d659c30
  10:     0x79d513564a93 - std::panicking::default_hook::h6de7d4d748c8b263
                               at /rustc/c9f8f3438a8134a413aa5d4903e0196e44e37bbc/library/std/src/panicking.rs:292:9
  11:     0x79d50fdf741f - std[bbe84908ccbe1712]::panicking::update_hook::<alloc[e8addd69f5f9766a]::boxed::Box<rustc_driver_impl[4a5ef0c71571037d]::install_ice_hook::{closure#0}>>::{closure#0}
  12:     0x79d51356542c - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h98893e692c20b532
                               at /rustc/c9f8f3438a8134a413aa5d4903e0196e44e37bbc/library/alloc/src/boxed.rs:2032:9
  13:     0x79d51356542c - std::panicking::rust_panic_with_hook::ha4c10d4e371025d4
                               at /rustc/c9f8f3438a8134a413aa5d4903e0196e44e37bbc/library/std/src/panicking.rs:793:13
  14:     0x79d51356519d - std::panicking::begin_panic_handler::{{closure}}::h8d8b80cfb6d2af9a
                               at /rustc/c9f8f3438a8134a413aa5d4903e0196e44e37bbc/library/std/src/panicking.rs:650:13
  15:     0x79d513562769 - std::sys_common::backtrace::__rust_end_short_backtrace::hedf50fb5defff019
                               at /rustc/c9f8f3438a8134a413aa5d4903e0196e44e37bbc/library/std/src/sys_common/backtrace.rs:171:18
  16:     0x79d513564f07 - rust_begin_unwind
                               at /rustc/c9f8f3438a8134a413aa5d4903e0196e44e37bbc/library/std/src/panicking.rs:646:5
  17:     0x79d5135afae6 - core::panicking::panic_fmt::hde3e2c796a3a5416
                               at /rustc/c9f8f3438a8134a413aa5d4903e0196e44e37bbc/library/core/src/panicking.rs:72:14
  18:     0x79d5135afb8f - core::panicking::panic::h150613825d1ad83d
                               at /rustc/c9f8f3438a8134a413aa5d4903e0196e44e37bbc/library/core/src/panicking.rs:141:5
  19:     0x79d5135af869 - core::option::unwrap_failed::h83da879f26f94880
                               at /rustc/c9f8f3438a8134a413aa5d4903e0196e44e37bbc/library/core/src/option.rs:1984:5
  20:     0x79d511600ea8 - <rustc_mir_build[81985b26f8ff446]::build::Builder>::expr_into_dest
  21:     0x79d5115fd18e - <rustc_mir_build[81985b26f8ff446]::build::Builder>::expr_into_dest
  22:     0x79d5115f16ba - <rustc_mir_build[81985b26f8ff446]::build::Builder>::as_temp::{closure#0}
  23:     0x79d5115f6714 - <rustc_mir_build[81985b26f8ff446]::build::Builder>::expr_as_place
  24:     0x79d5115f75ad - <rustc_mir_build[81985b26f8ff446]::build::Builder>::expr_as_place
  25:     0x79d5115f75ad - <rustc_mir_build[81985b26f8ff446]::build::Builder>::expr_as_place
  26:     0x79d5115ecfac - <rustc_mir_build[81985b26f8ff446]::build::Builder>::as_rvalue
  27:     0x79d5115f955c - <rustc_mir_build[81985b26f8ff446]::build::Builder>::expr_into_dest
  28:     0x79d5115fb4f6 - <rustc_mir_build[81985b26f8ff446]::build::Builder>::expr_into_dest
  29:     0x79d50e2a8c18 - <rustc_mir_build[81985b26f8ff446]::build::Builder>::ast_block_stmts
  30:     0x79d5115fa347 - <rustc_mir_build[81985b26f8ff446]::build::Builder>::expr_into_dest
  31:     0x79d5115fb4f6 - <rustc_mir_build[81985b26f8ff446]::build::Builder>::expr_into_dest
  32:     0x79d5115c0c6a - rustc_mir_build[81985b26f8ff446]::build::mir_build::{closure#0}
  33:     0x79d5115bcacf - rustc_mir_build[81985b26f8ff446]::build::mir_build
  34:     0x79d5115bbda8 - rustc_query_impl[2599229a2d608fd]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[2599229a2d608fd]::query_impl::mir_built::dynamic_query::{closure#2}::{closure#0}, rustc_middle[dd9835c0f7faa91c]::query::erase::Erased<[u8; 8usize]>>
  35:     0x79d5113e06f1 - rustc_query_system[b3fe5c7fa928b55c]::query::plumbing::try_execute_query::<rustc_query_impl[2599229a2d608fd]::DynamicConfig<rustc_query_system[b3fe5c7fa928b55c]::query::caches::VecCache<rustc_span[8fc22c8c557be2fa]::def_id::LocalDefId, rustc_middle[dd9835c0f7faa91c]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[2599229a2d608fd]::plumbing::QueryCtxt, false>
  36:     0x79d5113e02cc - rustc_query_impl[2599229a2d608fd]::query_impl::mir_built::get_query_non_incr::__rust_end_short_backtrace
  37:     0x79d511941908 - rustc_mir_transform[9bd419f3396e628a]::ffi_unwind_calls::has_ffi_unwind_calls
  38:     0x79d511941417 - rustc_query_impl[2599229a2d608fd]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[2599229a2d608fd]::query_impl::has_ffi_unwind_calls::dynamic_query::{closure#2}::{closure#0}, rustc_middle[dd9835c0f7faa91c]::query::erase::Erased<[u8; 1usize]>>
  39:     0x79d511940b7e - rustc_query_system[b3fe5c7fa928b55c]::query::plumbing::try_execute_query::<rustc_query_impl[2599229a2d608fd]::DynamicConfig<rustc_query_system[b3fe5c7fa928b55c]::query::caches::VecCache<rustc_span[8fc22c8c557be2fa]::def_id::LocalDefId, rustc_middle[dd9835c0f7faa91c]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[2599229a2d608fd]::plumbing::QueryCtxt, false>
  40:     0x79d51194077f - rustc_query_impl[2599229a2d608fd]::query_impl::has_ffi_unwind_calls::get_query_non_incr::__rust_end_short_backtrace
  41:     0x79d50ed211e3 - rustc_mir_transform[9bd419f3396e628a]::mir_promoted
  42:     0x79d511503b9a - rustc_query_impl[2599229a2d608fd]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[2599229a2d608fd]::query_impl::mir_promoted::dynamic_query::{closure#2}::{closure#0}, rustc_middle[dd9835c0f7faa91c]::query::erase::Erased<[u8; 16usize]>>
  43:     0x79d511503e5b - rustc_query_system[b3fe5c7fa928b55c]::query::plumbing::try_execute_query::<rustc_query_impl[2599229a2d608fd]::DynamicConfig<rustc_query_system[b3fe5c7fa928b55c]::query::caches::VecCache<rustc_span[8fc22c8c557be2fa]::def_id::LocalDefId, rustc_middle[dd9835c0f7faa91c]::query::erase::Erased<[u8; 16usize]>>, false, false, false>, rustc_query_impl[2599229a2d608fd]::plumbing::QueryCtxt, false>
  44:     0x79d511503aa3 - rustc_query_impl[2599229a2d608fd]::query_impl::mir_promoted::get_query_non_incr::__rust_end_short_backtrace
  45:     0x79d5113de850 - rustc_borrowck[734a863cae5ae9c]::mir_borrowck
  46:     0x79d5113de797 - rustc_query_impl[2599229a2d608fd]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[2599229a2d608fd]::query_impl::mir_borrowck::dynamic_query::{closure#2}::{closure#0}, rustc_middle[dd9835c0f7faa91c]::query::erase::Erased<[u8; 8usize]>>
  47:     0x79d5113e06f1 - rustc_query_system[b3fe5c7fa928b55c]::query::plumbing::try_execute_query::<rustc_query_impl[2599229a2d608fd]::DynamicConfig<rustc_query_system[b3fe5c7fa928b55c]::query::caches::VecCache<rustc_span[8fc22c8c557be2fa]::def_id::LocalDefId, rustc_middle[dd9835c0f7faa91c]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[2599229a2d608fd]::plumbing::QueryCtxt, false>
  48:     0x79d5113e020c - rustc_query_impl[2599229a2d608fd]::query_impl::mir_borrowck::get_query_non_incr::__rust_end_short_backtrace
  49:     0x79d511c2769c - rustc_middle[dd9835c0f7faa91c]::query::plumbing::query_get_at::<rustc_query_system[b3fe5c7fa928b55c]::query::caches::VecCache<rustc_span[8fc22c8c557be2fa]::def_id::LocalDefId, rustc_middle[dd9835c0f7faa91c]::query::erase::Erased<[u8; 8usize]>>>
  50:     0x79d511c2770e - <rustc_borrowck[734a863cae5ae9c]::type_check::TypeChecker>::prove_closure_bounds
  51:     0x79d5116d8e55 - <rustc_borrowck[734a863cae5ae9c]::type_check::TypeChecker>::typeck_mir
  52:     0x79d50e8e0e63 - rustc_borrowck[734a863cae5ae9c]::type_check::type_check
  53:     0x79d50e91ac0a - rustc_borrowck[734a863cae5ae9c]::nll::compute_regions
  54:     0x79d5121fd925 - rustc_borrowck[734a863cae5ae9c]::do_mir_borrowck
  55:     0x79d5113deca8 - rustc_borrowck[734a863cae5ae9c]::mir_borrowck
  56:     0x79d5113de797 - rustc_query_impl[2599229a2d608fd]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[2599229a2d608fd]::query_impl::mir_borrowck::dynamic_query::{closure#2}::{closure#0}, rustc_middle[dd9835c0f7faa91c]::query::erase::Erased<[u8; 8usize]>>
  57:     0x79d5113e06f1 - rustc_query_system[b3fe5c7fa928b55c]::query::plumbing::try_execute_query::<rustc_query_impl[2599229a2d608fd]::DynamicConfig<rustc_query_system[b3fe5c7fa928b55c]::query::caches::VecCache<rustc_span[8fc22c8c557be2fa]::def_id::LocalDefId, rustc_middle[dd9835c0f7faa91c]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[2599229a2d608fd]::plumbing::QueryCtxt, false>
  58:     0x79d5113e020c - rustc_query_impl[2599229a2d608fd]::query_impl::mir_borrowck::get_query_non_incr::__rust_end_short_backtrace
  59:     0x79d51186236f - rustc_middle[dd9835c0f7faa91c]::query::plumbing::query_get_at::<rustc_query_system[b3fe5c7fa928b55c]::query::caches::VecCache<rustc_span[8fc22c8c557be2fa]::def_id::LocalDefId, rustc_middle[dd9835c0f7faa91c]::query::erase::Erased<[u8; 8usize]>>>
  60:     0x79d50ff3c386 - <rustc_hir_analysis[6376f4166c2cb7c6]::collect::type_of::opaque::TaitConstraintLocator>::check
  61:     0x79d50ff2df52 - <rustc_hir_analysis[6376f4166c2cb7c6]::collect::type_of::opaque::TaitConstraintLocator as rustc_hir[ce6c89b18b0ff310]::intravisit::Visitor>::visit_item
  62:     0x79d51200e9f0 - rustc_hir_analysis[6376f4166c2cb7c6]::collect::type_of::type_of_opaque
  63:     0x79d51200e1d3 - rustc_query_impl[2599229a2d608fd]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[2599229a2d608fd]::query_impl::type_of_opaque::dynamic_query::{closure#2}::{closure#0}, rustc_middle[dd9835c0f7faa91c]::query::erase::Erased<[u8; 8usize]>>
  64:     0x79d5113c6fde - rustc_query_system[b3fe5c7fa928b55c]::query::plumbing::try_execute_query::<rustc_query_impl[2599229a2d608fd]::DynamicConfig<rustc_query_system[b3fe5c7fa928b55c]::query::caches::DefIdCache<rustc_middle[dd9835c0f7faa91c]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[2599229a2d608fd]::plumbing::QueryCtxt, false>
  65:     0x79d5121cba9e - rustc_query_impl[2599229a2d608fd]::query_impl::type_of_opaque::get_query_non_incr::__rust_end_short_backtrace
  66:     0x79d511864bd6 - rustc_middle[dd9835c0f7faa91c]::query::plumbing::query_get_at::<rustc_query_system[b3fe5c7fa928b55c]::query::caches::DefIdCache<rustc_middle[dd9835c0f7faa91c]::query::erase::Erased<[u8; 8usize]>>>
  67:     0x79d50ee4bb4c - rustc_hir_analysis[6376f4166c2cb7c6]::collect::type_of::type_of
  68:     0x79d5113c83a2 - rustc_query_impl[2599229a2d608fd]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[2599229a2d608fd]::query_impl::type_of::dynamic_query::{closure#2}::{closure#0}, rustc_middle[dd9835c0f7faa91c]::query::erase::Erased<[u8; 8usize]>>
  69:     0x79d5113c6fde - rustc_query_system[b3fe5c7fa928b55c]::query::plumbing::try_execute_query::<rustc_query_impl[2599229a2d608fd]::DynamicConfig<rustc_query_system[b3fe5c7fa928b55c]::query::caches::DefIdCache<rustc_middle[dd9835c0f7faa91c]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[2599229a2d608fd]::plumbing::QueryCtxt, false>
  70:     0x79d5113c6adb - rustc_query_impl[2599229a2d608fd]::query_impl::type_of::get_query_non_incr::__rust_end_short_backtrace
  71:     0x79d511864bd6 - rustc_middle[dd9835c0f7faa91c]::query::plumbing::query_get_at::<rustc_query_system[b3fe5c7fa928b55c]::query::caches::DefIdCache<rustc_middle[dd9835c0f7faa91c]::query::erase::Erased<[u8; 8usize]>>>
  72:     0x79d51216c641 - rustc_hir_analysis[6376f4166c2cb7c6]::check::check::check_item_type
  73:     0x79d511878712 - rustc_hir_analysis[6376f4166c2cb7c6]::check::wfcheck::check_well_formed
  74:     0x79d5118771eb - rustc_query_impl[2599229a2d608fd]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[2599229a2d608fd]::query_impl::check_well_formed::dynamic_query::{closure#2}::{closure#0}, rustc_middle[dd9835c0f7faa91c]::query::erase::Erased<[u8; 1usize]>>
  75:     0x79d511876980 - rustc_query_system[b3fe5c7fa928b55c]::query::plumbing::try_execute_query::<rustc_query_impl[2599229a2d608fd]::DynamicConfig<rustc_query_system[b3fe5c7fa928b55c]::query::caches::VecCache<rustc_hir[ce6c89b18b0ff310]::hir_id::OwnerId, rustc_middle[dd9835c0f7faa91c]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[2599229a2d608fd]::plumbing::QueryCtxt, false>
  76:     0x79d5118766ff - rustc_query_impl[2599229a2d608fd]::query_impl::check_well_formed::get_query_non_incr::__rust_end_short_backtrace
  77:     0x79d51187463a - rustc_hir_analysis[6376f4166c2cb7c6]::check::wfcheck::check_mod_type_wf
  78:     0x79d511874461 - rustc_query_impl[2599229a2d608fd]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[2599229a2d608fd]::query_impl::check_mod_type_wf::dynamic_query::{closure#2}::{closure#0}, rustc_middle[dd9835c0f7faa91c]::query::erase::Erased<[u8; 1usize]>>
  79:     0x79d511c9d870 - rustc_query_system[b3fe5c7fa928b55c]::query::plumbing::try_execute_query::<rustc_query_impl[2599229a2d608fd]::DynamicConfig<rustc_query_system[b3fe5c7fa928b55c]::query::caches::DefaultCache<rustc_span[8fc22c8c557be2fa]::def_id::LocalModDefId, rustc_middle[dd9835c0f7faa91c]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[2599229a2d608fd]::plumbing::QueryCtxt, false>
  80:     0x79d511c9d61b - rustc_query_impl[2599229a2d608fd]::query_impl::check_mod_type_wf::get_query_non_incr::__rust_end_short_backtrace
  81:     0x79d5113dadfb - rustc_hir_analysis[6376f4166c2cb7c6]::check_crate
  82:     0x79d511748e2a - rustc_interface[f35796931ff6d62f]::passes::analysis
  83:     0x79d511748993 - rustc_query_impl[2599229a2d608fd]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[2599229a2d608fd]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[dd9835c0f7faa91c]::query::erase::Erased<[u8; 1usize]>>
  84:     0x79d512000525 - rustc_query_system[b3fe5c7fa928b55c]::query::plumbing::try_execute_query::<rustc_query_impl[2599229a2d608fd]::DynamicConfig<rustc_query_system[b3fe5c7fa928b55c]::query::caches::SingleCache<rustc_middle[dd9835c0f7faa91c]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[2599229a2d608fd]::plumbing::QueryCtxt, false>
  85:     0x79d512000289 - rustc_query_impl[2599229a2d608fd]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  86:     0x79d511ea2885 - rustc_interface[f35796931ff6d62f]::interface::run_compiler::<core[e11ba6fe20ece5aa]::result::Result<(), rustc_span[8fc22c8c557be2fa]::ErrorGuaranteed>, rustc_driver_impl[4a5ef0c71571037d]::run_compiler::{closure#0}>::{closure#0}
  87:     0x79d511f71845 - std[bbe84908ccbe1712]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[f35796931ff6d62f]::util::run_in_thread_with_globals<rustc_interface[f35796931ff6d62f]::util::run_in_thread_pool_with_globals<rustc_interface[f35796931ff6d62f]::interface::run_compiler<core[e11ba6fe20ece5aa]::result::Result<(), rustc_span[8fc22c8c557be2fa]::ErrorGuaranteed>, rustc_driver_impl[4a5ef0c71571037d]::run_compiler::{closure#0}>::{closure#0}, core[e11ba6fe20ece5aa]::result::Result<(), rustc_span[8fc22c8c557be2fa]::ErrorGuaranteed>>::{closure#0}, core[e11ba6fe20ece5aa]::result::Result<(), rustc_span[8fc22c8c557be2fa]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[e11ba6fe20ece5aa]::result::Result<(), rustc_span[8fc22c8c557be2fa]::ErrorGuaranteed>>
  88:     0x79d511f71672 - <<std[bbe84908ccbe1712]::thread::Builder>::spawn_unchecked_<rustc_interface[f35796931ff6d62f]::util::run_in_thread_with_globals<rustc_interface[f35796931ff6d62f]::util::run_in_thread_pool_with_globals<rustc_interface[f35796931ff6d62f]::interface::run_compiler<core[e11ba6fe20ece5aa]::result::Result<(), rustc_span[8fc22c8c557be2fa]::ErrorGuaranteed>, rustc_driver_impl[4a5ef0c71571037d]::run_compiler::{closure#0}>::{closure#0}, core[e11ba6fe20ece5aa]::result::Result<(), rustc_span[8fc22c8c557be2fa]::ErrorGuaranteed>>::{closure#0}, core[e11ba6fe20ece5aa]::result::Result<(), rustc_span[8fc22c8c557be2fa]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[e11ba6fe20ece5aa]::result::Result<(), rustc_span[8fc22c8c557be2fa]::ErrorGuaranteed>>::{closure#1} as core[e11ba6fe20ece5aa]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  89:     0x79d51356ed89 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h7ab391504a3969f1
                               at /rustc/c9f8f3438a8134a413aa5d4903e0196e44e37bbc/library/alloc/src/boxed.rs:2018:9
  90:     0x79d51356ed89 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h39323d8edfd154a5
                               at /rustc/c9f8f3438a8134a413aa5d4903e0196e44e37bbc/library/alloc/src/boxed.rs:2018:9
  91:     0x79d51356ed89 - std::sys::pal::unix::thread::Thread::new::thread_start::h2dd21aff3b4d0913
                               at /rustc/c9f8f3438a8134a413aa5d4903e0196e44e37bbc/library/std/src/sys/pal/unix/thread.rs:108:17
  92:     0x79d51330e55a - <unknown>
  93:     0x79d51338ba3c - <unknown>
  94:                0x0 - <unknown>

error: 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: please attach the file at `/tmp/im/o/rustc-ice-2024-03-28T07_03_39-136795.txt` to your bug report

query stack during panic:
#0 [mir_built] building MIR for `main::{closure#0}`
#1 [has_ffi_unwind_calls] checking if `main::{closure#0}` contains FFI-unwind calls
#2 [mir_promoted] promoting constants in MIR for `main::{closure#0}`
#3 [mir_borrowck] borrow-checking `main::{closure#0}`
#4 [mir_borrowck] borrow-checking `main`
#5 [type_of_opaque] computing type of opaque `main::T::{opaque#0}`
#6 [type_of] computing type of `main::T::{opaque#0}`
#7 [check_well_formed] checking that `main::T::{opaque#0}` is well-formed
#8 [check_mod_type_wf] checking that types are well-formed in top-level module
#9 [analysis] running analysis passes on this crate
end of query stack
warning: 2 warnings emitted

note: no errors encountered even though delayed bugs were created

note: those delayed bugs will now be shown as internal compiler errors

error: internal compiler error: {OpaqueTypeKey { def_id: DefId(0:13 ~ 8C6E9F300DC05B0119EFD44A9B65DCB8844EF8D4829A527B3FE069E16DF441EF[8eeb]::main::T::{opaque#0}), args: [] }: OpaqueTypeDecl { hidden_type: OpaqueHiddenType { span: 8C6E9F300DC05B0119EFD44A9B65DCB8844EF8D4829A527B3FE069E16DF441EF.rs:10:13: 14:6 (#0), ty: Foo } }}
  |
  = note: delayed at compiler/rustc_infer/src/infer/opaque_types/table.rs:43:43
             0: <rustc_errors::DiagCtxtInner>::emit_diagnostic
             1: <rustc_errors::DiagCtxt>::emit_diagnostic
             2: <rustc_span::ErrorGuaranteed as rustc_errors::diagnostic::EmissionGuarantee>::emit_producing_guarantee
             3: core::ptr::drop_in_place::<rustc_infer::infer::InferCtxt>
             4: rustc_borrowck::mir_borrowck
             5: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::mir_borrowck::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 8]>>
             6: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::Erased<[u8; 8]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
             7: rustc_query_impl::query_impl::mir_borrowck::get_query_non_incr::__rust_end_short_backtrace
             8: rustc_middle::query::plumbing::query_get_at::<rustc_query_system::query::caches::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::Erased<[u8; 8]>>>
             9: <rustc_hir_analysis::collect::type_of::opaque::TaitConstraintLocator>::check
            10: <rustc_hir_analysis::collect::type_of::opaque::TaitConstraintLocator as rustc_hir::intravisit::Visitor>::visit_item
            11: rustc_hir_analysis::collect::type_of::type_of_opaque
            12: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::type_of_opaque::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 8]>>
            13: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::DefIdCache<rustc_middle::query::erase::Erased<[u8; 8]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
            14: rustc_query_impl::query_impl::type_of_opaque::get_query_non_incr::__rust_end_short_backtrace
            15: rustc_middle::query::plumbing::query_get_at::<rustc_query_system::query::caches::DefIdCache<rustc_middle::query::erase::Erased<[u8; 8]>>>
            16: rustc_hir_analysis::collect::type_of::type_of
            17: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::type_of::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 8]>>
            18: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::DefIdCache<rustc_middle::query::erase::Erased<[u8; 8]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
            19: rustc_query_impl::query_impl::type_of::get_query_non_incr::__rust_end_short_backtrace
            20: rustc_middle::query::plumbing::query_get_at::<rustc_query_system::query::caches::DefIdCache<rustc_middle::query::erase::Erased<[u8; 8]>>>
            21: rustc_hir_analysis::check::check::check_item_type
            22: rustc_hir_analysis::check::wfcheck::check_well_formed
            23: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::check_well_formed::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 1]>>
            24: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::VecCache<rustc_hir::hir_id::OwnerId, rustc_middle::query::erase::Erased<[u8; 1]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
            25: rustc_query_impl::query_impl::check_well_formed::get_query_non_incr::__rust_end_short_backtrace
            26: rustc_hir_analysis::check::wfcheck::check_mod_type_wf
            27: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::check_mod_type_wf::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 1]>>
            28: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::DefaultCache<rustc_span::def_id::LocalModDefId, rustc_middle::query::erase::Erased<[u8; 1]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
            29: rustc_query_impl::query_impl::check_mod_type_wf::get_query_non_incr::__rust_end_short_backtrace
            30: rustc_hir_analysis::check_crate
            31: rustc_interface::passes::analysis
            32: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 1]>>
            33: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::SingleCache<rustc_middle::query::erase::Erased<[u8; 1]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
            34: rustc_query_impl::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
            35: rustc_interface::interface::run_compiler::<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#0}>::{closure#0}
            36: std::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#0}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>
            37: <<std::thread::Builder>::spawn_unchecked_<rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#0}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
            38: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
                       at /rustc/c9f8f3438a8134a413aa5d4903e0196e44e37bbc/library/alloc/src/boxed.rs:2018:9
            39: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
                       at /rustc/c9f8f3438a8134a413aa5d4903e0196e44e37bbc/library/alloc/src/boxed.rs:2018:9
            40: std::sys::pal::unix::thread::Thread::new::thread_start
                       at /rustc/c9f8f3438a8134a413aa5d4903e0196e44e37bbc/library/std/src/sys/pal/unix/thread.rs:108:17
            41: <unknown>
            42: <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/im/o/rustc-ice-2024-03-28T07_03_39-136795.txt` to your bug report

query stack during panic:
end of query stack
thread 'rustc' panicked at library/core/src/panicking.rs:160:5:
panic in a destructor during cleanup

error: 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: please attach the file at `/tmp/im/o/rustc-ice-2024-03-28T07_03_39-136795.txt` to your bug report

query stack during panic:
end of query stack
thread caused non-unwinding panic. aborting.
[1]    136795 IOT instruction  rustc 8C6E9F300DC05B0119EFD44A9B65DCB8844EF8D4829A527B3FE069E16DF441EF.rs

[matthiaskrgr]

Regression in nightly-2022-03-31
fetching (via remote github) commits from max(9c06e1b, 2022-03-28) to c5cf08d
ending github query because we found starting sha: 9c06e1b
get_commits_between returning commits, len: 8
commit[0] 2022-03-29: Auto merge of #95448 - Dylan-DPC:rollup-wpj5yto, r=Dylan-DPC
commit[1] 2022-03-30: Auto merge of #95455 - RalfJung:miri, r=RalfJung
commit[2] 2022-03-30: Auto merge of #94081 - oli-obk:lazy_tait_take_two, r=nikomatsakis
commit[3] 2022-03-30: Auto merge of #95466 - Dylan-DPC:rollup-g7ddr8y, r=Dylan-DPC
commit[4] 2022-03-30: Auto merge of #95241 - Gankra:cleaned-provenance, r=workingjubilee
commit[5] 2022-03-30: Auto merge of #94963 - lcnr:inherent-impls-std, r=oli-obk,m-ou-se
commit[6] 2022-03-30: Auto merge of #95458 - calebcartwright:sync-rustfmt-subtree, r=calebcartwright
commit[7] 2022-03-30: Auto merge of #95425 - nnethercote:yet-more-parse_tt-improvements, r=petrochenkov
ERROR: no CI builds available between 9c06e1b and c5cf08d within last 167 days

could be #94081 ? cc @oli-obk

[oli-obk]

Definitely. This should have been fixed by PlaceElem::OpaqueType, but apparently I missed something