ICE in mir building with captured value of unresolved type, `None` in `compiler/rustc_mir_build/src/build/expr/as_place.rs`

[conradludgate]

Code

https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=1977129cfed4ad3641190eef3e6ebc97

mod a {
    use crate::B;
    pub fn a() -> B { B }
}
pub struct B;

mod handlers {
    use crate::a::{a, B};
    pub struct C(B);

    pub fn c() -> impl Fn() -> C {
        let a1 = ();
        || C((a(), a1).into())
    }
}

Meta

rustc --version --verbose:

rustc 1.71.0-nightly (d0f204e4d 2023-04-16)
binary: rustc
commit-hash: d0f204e4d750b62f9d6c2593405e828757126832
commit-date: 2023-04-16
host: aarch64-apple-darwin
release: 1.71.0-nightly
LLVM version: 16.0.2

Error output

error[E0603]: struct import `B` is private
  --> src/lib.rs:12:19
   |
12 |     use crate::a::B;
   |                   ^ private struct import
   |
note: the struct import `B` is defined here...
  --> src/lib.rs:2:9
   |
2  |     use crate::B;
   |         ^^^^^^^^
note: ...and refers to the struct `B` which is defined here
  --> src/lib.rs:8:1
   |
8  | pub struct B;
   | ^^^^^^^^^^^^^ consider importing it directly

thread 'rustc' panicked at 'called `Option::unwrap()` on a `None` value', compiler/rustc_mir_build/src/build/expr/as_place.rs:256:31

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: rustc 1.71.0-nightly (d0f204e4d 2023-04-16) running on aarch64-apple-darwin

note: compiler flags: --crate-type lib -C embed-bitcode=no -C codegen-units=1 -C debuginfo=2

note: some of the compiler flags provided by cargo are hidden

query stack during panic:
#0 [mir_built] building MIR for `handlers::c::{closure#0}::{closure#0}`
#1 [unsafety_check_result] unsafety-checking `handlers::c::{closure#0}::{closure#0}`
#2 [unsafety_check_result] unsafety-checking `handlers::c::{closure#0}`
#3 [unsafety_check_result] unsafety-checking `handlers::c`
#4 [mir_const] preparing `handlers::c` for borrow checking
#5 [mir_promoted] processing MIR for `handlers::c`
#6 [mir_borrowck] borrow-checking `handlers::c`
#7 [type_of] computing type of `handlers::c::{opaque#0}`
#8 [check_mod_item_types] checking item types in module `handlers`
#9 [analysis] running analysis passes on this crate
end of query stack
For more information about this error, try `rustc --explain E0603`.

Backtrace

stack backtrace:
   0:        0x103491894 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hbe6b2e192ca15116
   1:        0x1034e4988 - core::fmt::write::hd6a055451ad3f5fd
   2:        0x10348733c - std::io::Write::write_fmt::h3bd90167a87b98a7
   3:        0x1034916a8 - std::sys_common::backtrace::print::hc24f8cd977e05789
   4:        0x1034940bc - std::panicking::default_hook::{{closure}}::h86be795d87f6f599
   5:        0x103493e7c - std::panicking::default_hook::h33158989e4e670cd
   6:        0x10b98f898 - rustc_driver_impl[2b4a73ce5be55b2]::DEFAULT_HOOK::{closure#0}::{closure#0}
   7:        0x10349477c - std::panicking::rust_panic_with_hook::he1c4ce779ead934c
   8:        0x103494534 - std::panicking::begin_panic_handler::{{closure}}::h8107a332a0a8a016
   9:        0x103491cb4 - std::sys_common::backtrace::__rust_end_short_backtrace::hfd6621bf0e44821e
  10:        0x103494308 - _rust_begin_unwind
  11:        0x103510430 - core::panicking::panic_fmt::h68c357d89a917539
  12:        0x1035104a0 - core::panicking::panic::hb3c8208af4dcc4f1
  13:        0x10e69c964 - <rustc_mir_build[17ef53cc3e5b72c9]::build::Builder>::expr_into_dest
  14:        0x10e6999cc - <rustc_mir_build[17ef53cc3e5b72c9]::build::Builder>::as_temp_inner
  15:        0x10e6990d4 - <rustc_mir_build[17ef53cc3e5b72c9]::build::Builder>::as_operand
  16:        0x10e699274 - <rustc_mir_build[17ef53cc3e5b72c9]::build::Builder>::as_operand
  17:        0x10e6aa2ac - <alloc[f4f0542297ee9225]::vec::Vec<rustc_middle[9da08aa6ecd6d5c0]::mir::syntax::Operand> as alloc[f4f0542297ee9225]::vec::spec_from_iter::SpecFromIter<rustc_middle[9da08aa6ecd6d5c0]::mir::syntax::Operand, core[504f2899fffd0de7]::iter::adapters::map::Map<core[504f2899fffd0de7]::iter::adapters::copied::Copied<core[504f2899fffd0de7]::slice::iter::Iter<rustc_middle[9da08aa6ecd6d5c0]::thir::ExprId>>, <rustc_mir_build[17ef53cc3e5b72c9]::build::Builder>::as_rvalue::{closure#3}>>>::from_iter
  18:        0x10e689e78 - <rustc_mir_build[17ef53cc3e5b72c9]::build::Builder>::as_rvalue
  19:        0x10e699c18 - <rustc_mir_build[17ef53cc3e5b72c9]::build::Builder>::expr_into_dest
  20:        0x10e6999cc - <rustc_mir_build[17ef53cc3e5b72c9]::build::Builder>::as_temp_inner
  21:        0x10e6990d4 - <rustc_mir_build[17ef53cc3e5b72c9]::build::Builder>::as_operand
  22:        0x10e687b28 - <rustc_mir_build[17ef53cc3e5b72c9]::build::Builder>::as_call_operand
  23:        0x10e687ca8 - <rustc_mir_build[17ef53cc3e5b72c9]::build::Builder>::as_call_operand
  24:        0x10e6cea24 - <core[504f2899fffd0de7]::iter::adapters::copied::Copied<core[504f2899fffd0de7]::slice::iter::Iter<rustc_middle[9da08aa6ecd6d5c0]::thir::ExprId>> as core[504f2899fffd0de7]::iter::traits::iterator::Iterator>::fold::<(), core[504f2899fffd0de7]::iter::adapters::map::map_fold<rustc_middle[9da08aa6ecd6d5c0]::thir::ExprId, rustc_middle[9da08aa6ecd6d5c0]::mir::syntax::Operand, (), <rustc_mir_build[17ef53cc3e5b72c9]::build::Builder>::expr_into_dest::{closure#3}, core[504f2899fffd0de7]::iter::traits::iterator::Iterator::for_each::call<rustc_middle[9da08aa6ecd6d5c0]::mir::syntax::Operand, <alloc[f4f0542297ee9225]::vec::Vec<rustc_middle[9da08aa6ecd6d5c0]::mir::syntax::Operand>>::extend_trusted<core[504f2899fffd0de7]::iter::adapters::map::Map<core[504f2899fffd0de7]::iter::adapters::copied::Copied<core[504f2899fffd0de7]::slice::iter::Iter<rustc_middle[9da08aa6ecd6d5c0]::thir::ExprId>>, <rustc_mir_build[17ef53cc3e5b72c9]::build::Builder>::expr_into_dest::{closure#3}>>::{closure#0}>::{closure#0}>::{closure#0}>
  25:        0x10e6a9ffc - <alloc[f4f0542297ee9225]::vec::Vec<rustc_middle[9da08aa6ecd6d5c0]::mir::syntax::Operand> as alloc[f4f0542297ee9225]::vec::spec_from_iter::SpecFromIter<rustc_middle[9da08aa6ecd6d5c0]::mir::syntax::Operand, core[504f2899fffd0de7]::iter::adapters::map::Map<core[504f2899fffd0de7]::iter::adapters::copied::Copied<core[504f2899fffd0de7]::slice::iter::Iter<rustc_middle[9da08aa6ecd6d5c0]::thir::ExprId>>, <rustc_mir_build[17ef53cc3e5b72c9]::build::Builder>::expr_into_dest::{closure#3}>>>::from_iter
  26:        0x10e69ad6c - <rustc_mir_build[17ef53cc3e5b72c9]::build::Builder>::expr_into_dest
  27:        0x10e69f25c - <rustc_mir_build[17ef53cc3e5b72c9]::build::Builder>::in_scope::<<rustc_mir_build[17ef53cc3e5b72c9]::build::Builder>::expr_into_dest::{closure#0}::{closure#0}, ()>
  28:        0x10e69d12c - <rustc_mir_build[17ef53cc3e5b72c9]::build::Builder>::expr_into_dest::{closure#0}
  29:        0x10e69accc - <rustc_mir_build[17ef53cc3e5b72c9]::build::Builder>::expr_into_dest
  30:        0x10e69f25c - <rustc_mir_build[17ef53cc3e5b72c9]::build::Builder>::in_scope::<<rustc_mir_build[17ef53cc3e5b72c9]::build::Builder>::expr_into_dest::{closure#0}::{closure#0}, ()>
  31:        0x10e69d12c - <rustc_mir_build[17ef53cc3e5b72c9]::build::Builder>::expr_into_dest::{closure#0}
  32:        0x10e69accc - <rustc_mir_build[17ef53cc3e5b72c9]::build::Builder>::expr_into_dest
  33:        0x10e68315c - rustc_mir_build[17ef53cc3e5b72c9]::build::mir_build
  34:        0x10e68119c - rustc_mir_build[17ef53cc3e5b72c9]::build::mir_built
  35:        0x10ec64cf0 - <std[aa9a5926a012de0d]::thread::local::LocalKey<core[504f2899fffd0de7]::cell::Cell<*const ()>>>::with::<rustc_middle[9da08aa6ecd6d5c0]::ty::context::tls::enter_context<rustc_query_system[72e7dbc91c3512cd]::query::plumbing::execute_job_incr<rustc_query_impl[60724b15931b629e]::queries::mir_built, rustc_query_impl[60724b15931b629e]::plumbing::QueryCtxt>::{closure#2}, (rustc_middle[9da08aa6ecd6d5c0]::query::erase::Erased<[u8; 8usize]>, rustc_query_system[72e7dbc91c3512cd]::dep_graph::graph::DepNodeIndex)>::{closure#0}, (rustc_middle[9da08aa6ecd6d5c0]::query::erase::Erased<[u8; 8usize]>, rustc_query_system[72e7dbc91c3512cd]::dep_graph::graph::DepNodeIndex)>
  36:        0x10eb6a160 - rustc_query_system[72e7dbc91c3512cd]::query::plumbing::try_execute_query::<rustc_query_impl[60724b15931b629e]::queries::mir_built, rustc_query_impl[60724b15931b629e]::plumbing::QueryCtxt>
  37:        0x10ed5cccc - <rustc_query_impl[60724b15931b629e]::Queries as rustc_middle[9da08aa6ecd6d5c0]::ty::query::QueryEngine>::mir_built
  38:        0x10e14dff4 - rustc_mir_transform[2f1f3373e510a36a]::check_unsafety::unsafety_check_result
  39:        0x10e14aac0 - <rustc_mir_transform[2f1f3373e510a36a]::check_unsafety::provide::{closure#0} as core[504f2899fffd0de7]::ops::function::FnOnce<(rustc_middle[9da08aa6ecd6d5c0]::ty::context::TyCtxt, rustc_span[219dcf8acbb1c73e]::def_id::LocalDefId)>>::call_once
  40:        0x10ec24658 - <std[aa9a5926a012de0d]::thread::local::LocalKey<core[504f2899fffd0de7]::cell::Cell<*const ()>>>::with::<rustc_middle[9da08aa6ecd6d5c0]::ty::context::tls::enter_context<rustc_query_system[72e7dbc91c3512cd]::query::plumbing::execute_job_incr<rustc_query_impl[60724b15931b629e]::queries::unsafety_check_result, rustc_query_impl[60724b15931b629e]::plumbing::QueryCtxt>::{closure#2}, (rustc_middle[9da08aa6ecd6d5c0]::query::erase::Erased<[u8; 8usize]>, rustc_query_system[72e7dbc91c3512cd]::dep_graph::graph::DepNodeIndex)>::{closure#0}, (rustc_middle[9da08aa6ecd6d5c0]::query::erase::Erased<[u8; 8usize]>, rustc_query_system[72e7dbc91c3512cd]::dep_graph::graph::DepNodeIndex)>
  41:        0x10eb348bc - rustc_query_system[72e7dbc91c3512cd]::query::plumbing::try_execute_query::<rustc_query_impl[60724b15931b629e]::queries::unsafety_check_result, rustc_query_impl[60724b15931b629e]::plumbing::QueryCtxt>
  42:        0x10ed623a0 - <rustc_query_impl[60724b15931b629e]::Queries as rustc_middle[9da08aa6ecd6d5c0]::ty::query::QueryEngine>::unsafety_check_result
  43:        0x10e14c6dc - <rustc_mir_transform[2f1f3373e510a36a]::check_unsafety::UnsafetyChecker as rustc_middle[9da08aa6ecd6d5c0]::mir::visit::Visitor>::visit_rvalue
  44:        0x10e14e19c - rustc_mir_transform[2f1f3373e510a36a]::check_unsafety::unsafety_check_result
  45:        0x10e14aac0 - <rustc_mir_transform[2f1f3373e510a36a]::check_unsafety::provide::{closure#0} as core[504f2899fffd0de7]::ops::function::FnOnce<(rustc_middle[9da08aa6ecd6d5c0]::ty::context::TyCtxt, rustc_span[219dcf8acbb1c73e]::def_id::LocalDefId)>>::call_once
  46:        0x10ec24658 - <std[aa9a5926a012de0d]::thread::local::LocalKey<core[504f2899fffd0de7]::cell::Cell<*const ()>>>::with::<rustc_middle[9da08aa6ecd6d5c0]::ty::context::tls::enter_context<rustc_query_system[72e7dbc91c3512cd]::query::plumbing::execute_job_incr<rustc_query_impl[60724b15931b629e]::queries::unsafety_check_result, rustc_query_impl[60724b15931b629e]::plumbing::QueryCtxt>::{closure#2}, (rustc_middle[9da08aa6ecd6d5c0]::query::erase::Erased<[u8; 8usize]>, rustc_query_system[72e7dbc91c3512cd]::dep_graph::graph::DepNodeIndex)>::{closure#0}, (rustc_middle[9da08aa6ecd6d5c0]::query::erase::Erased<[u8; 8usize]>, rustc_query_system[72e7dbc91c3512cd]::dep_graph::graph::DepNodeIndex)>
  47:        0x10eb348bc - rustc_query_system[72e7dbc91c3512cd]::query::plumbing::try_execute_query::<rustc_query_impl[60724b15931b629e]::queries::unsafety_check_result, rustc_query_impl[60724b15931b629e]::plumbing::QueryCtxt>
  48:        0x10ed623a0 - <rustc_query_impl[60724b15931b629e]::Queries as rustc_middle[9da08aa6ecd6d5c0]::ty::query::QueryEngine>::unsafety_check_result
  49:        0x10e14c6dc - <rustc_mir_transform[2f1f3373e510a36a]::check_unsafety::UnsafetyChecker as rustc_middle[9da08aa6ecd6d5c0]::mir::visit::Visitor>::visit_rvalue
  50:        0x10e14e19c - rustc_mir_transform[2f1f3373e510a36a]::check_unsafety::unsafety_check_result
  51:        0x10e14aac0 - <rustc_mir_transform[2f1f3373e510a36a]::check_unsafety::provide::{closure#0} as core[504f2899fffd0de7]::ops::function::FnOnce<(rustc_middle[9da08aa6ecd6d5c0]::ty::context::TyCtxt, rustc_span[219dcf8acbb1c73e]::def_id::LocalDefId)>>::call_once
  52:        0x10ec24658 - <std[aa9a5926a012de0d]::thread::local::LocalKey<core[504f2899fffd0de7]::cell::Cell<*const ()>>>::with::<rustc_middle[9da08aa6ecd6d5c0]::ty::context::tls::enter_context<rustc_query_system[72e7dbc91c3512cd]::query::plumbing::execute_job_incr<rustc_query_impl[60724b15931b629e]::queries::unsafety_check_result, rustc_query_impl[60724b15931b629e]::plumbing::QueryCtxt>::{closure#2}, (rustc_middle[9da08aa6ecd6d5c0]::query::erase::Erased<[u8; 8usize]>, rustc_query_system[72e7dbc91c3512cd]::dep_graph::graph::DepNodeIndex)>::{closure#0}, (rustc_middle[9da08aa6ecd6d5c0]::query::erase::Erased<[u8; 8usize]>, rustc_query_system[72e7dbc91c3512cd]::dep_graph::graph::DepNodeIndex)>
  53:        0x10eb348bc - rustc_query_system[72e7dbc91c3512cd]::query::plumbing::try_execute_query::<rustc_query_impl[60724b15931b629e]::queries::unsafety_check_result, rustc_query_impl[60724b15931b629e]::plumbing::QueryCtxt>
  54:        0x10ed623a0 - <rustc_query_impl[60724b15931b629e]::Queries as rustc_middle[9da08aa6ecd6d5c0]::ty::query::QueryEngine>::unsafety_check_result
  55:        0x10e1744d4 - rustc_mir_transform[2f1f3373e510a36a]::mir_const
  56:        0x10ec6567c - <std[aa9a5926a012de0d]::thread::local::LocalKey<core[504f2899fffd0de7]::cell::Cell<*const ()>>>::with::<rustc_middle[9da08aa6ecd6d5c0]::ty::context::tls::enter_context<rustc_query_system[72e7dbc91c3512cd]::query::plumbing::execute_job_incr<rustc_query_impl[60724b15931b629e]::queries::mir_const, rustc_query_impl[60724b15931b629e]::plumbing::QueryCtxt>::{closure#2}, (rustc_middle[9da08aa6ecd6d5c0]::query::erase::Erased<[u8; 8usize]>, rustc_query_system[72e7dbc91c3512cd]::dep_graph::graph::DepNodeIndex)>::{closure#0}, (rustc_middle[9da08aa6ecd6d5c0]::query::erase::Erased<[u8; 8usize]>, rustc_query_system[72e7dbc91c3512cd]::dep_graph::graph::DepNodeIndex)>
  57:        0x10eb6a83c - rustc_query_system[72e7dbc91c3512cd]::query::plumbing::try_execute_query::<rustc_query_impl[60724b15931b629e]::queries::mir_const, rustc_query_impl[60724b15931b629e]::plumbing::QueryCtxt>
  58:        0x10ed5ce8c - <rustc_query_impl[60724b15931b629e]::Queries as rustc_middle[9da08aa6ecd6d5c0]::ty::query::QueryEngine>::mir_const
  59:        0x10e174e10 - rustc_mir_transform[2f1f3373e510a36a]::mir_promoted
  60:        0x10ebd1ff4 - <std[aa9a5926a012de0d]::thread::local::LocalKey<core[504f2899fffd0de7]::cell::Cell<*const ()>>>::with::<rustc_middle[9da08aa6ecd6d5c0]::ty::context::tls::enter_context<rustc_query_system[72e7dbc91c3512cd]::query::plumbing::execute_job_incr<rustc_query_impl[60724b15931b629e]::queries::mir_promoted, rustc_query_impl[60724b15931b629e]::plumbing::QueryCtxt>::{closure#2}, (rustc_middle[9da08aa6ecd6d5c0]::query::erase::Erased<[u8; 16usize]>, rustc_query_system[72e7dbc91c3512cd]::dep_graph::graph::DepNodeIndex)>::{closure#0}, (rustc_middle[9da08aa6ecd6d5c0]::query::erase::Erased<[u8; 16usize]>, rustc_query_system[72e7dbc91c3512cd]::dep_graph::graph::DepNodeIndex)>
  61:        0x10eaf2d78 - rustc_query_system[72e7dbc91c3512cd]::query::plumbing::try_execute_query::<rustc_query_impl[60724b15931b629e]::queries::mir_promoted, rustc_query_impl[60724b15931b629e]::plumbing::QueryCtxt>
  62:        0x10ed5d920 - <rustc_query_impl[60724b15931b629e]::Queries as rustc_middle[9da08aa6ecd6d5c0]::ty::query::QueryEngine>::mir_promoted
  63:        0x10e78017c - rustc_borrowck[f3efb053a40a8e7a]::mir_borrowck
  64:        0x10e76464c - <rustc_borrowck[f3efb053a40a8e7a]::provide::{closure#0} as core[504f2899fffd0de7]::ops::function::FnOnce<(rustc_middle[9da08aa6ecd6d5c0]::ty::context::TyCtxt, rustc_span[219dcf8acbb1c73e]::def_id::LocalDefId)>>::call_once
  65:        0x10ebd07a0 - <std[aa9a5926a012de0d]::thread::local::LocalKey<core[504f2899fffd0de7]::cell::Cell<*const ()>>>::with::<rustc_middle[9da08aa6ecd6d5c0]::ty::context::tls::enter_context<rustc_query_system[72e7dbc91c3512cd]::query::plumbing::execute_job_incr<rustc_query_impl[60724b15931b629e]::queries::mir_borrowck, rustc_query_impl[60724b15931b629e]::plumbing::QueryCtxt>::{closure#2}, (rustc_middle[9da08aa6ecd6d5c0]::query::erase::Erased<[u8; 8usize]>, rustc_query_system[72e7dbc91c3512cd]::dep_graph::graph::DepNodeIndex)>::{closure#0}, (rustc_middle[9da08aa6ecd6d5c0]::query::erase::Erased<[u8; 8usize]>, rustc_query_system[72e7dbc91c3512cd]::dep_graph::graph::DepNodeIndex)>
  66:        0x10eaf1f5c - rustc_query_system[72e7dbc91c3512cd]::query::plumbing::try_execute_query::<rustc_query_impl[60724b15931b629e]::queries::mir_borrowck, rustc_query_impl[60724b15931b629e]::plumbing::QueryCtxt>
  67:        0x10ed64ff8 - <rustc_query_impl[60724b15931b629e]::Queries as rustc_middle[9da08aa6ecd6d5c0]::ty::query::QueryEngine>::mir_borrowck
  68:        0x10e0509fc - rustc_hir_analysis[480d2d1e8c0c78d3]::collect::type_of::find_opaque_ty_constraints_for_rpit
  69:        0x10e04ffc4 - rustc_hir_analysis[480d2d1e8c0c78d3]::collect::type_of::type_of
  70:        0x10ec5df28 - <std[aa9a5926a012de0d]::thread::local::LocalKey<core[504f2899fffd0de7]::cell::Cell<*const ()>>>::with::<rustc_middle[9da08aa6ecd6d5c0]::ty::context::tls::enter_context<rustc_query_system[72e7dbc91c3512cd]::query::plumbing::execute_job_incr<rustc_query_impl[60724b15931b629e]::queries::type_of, rustc_query_impl[60724b15931b629e]::plumbing::QueryCtxt>::{closure#2}, (rustc_middle[9da08aa6ecd6d5c0]::query::erase::Erased<[u8; 8usize]>, rustc_query_system[72e7dbc91c3512cd]::dep_graph::graph::DepNodeIndex)>::{closure#0}, (rustc_middle[9da08aa6ecd6d5c0]::query::erase::Erased<[u8; 8usize]>, rustc_query_system[72e7dbc91c3512cd]::dep_graph::graph::DepNodeIndex)>
  71:        0x10eb645bc - rustc_query_system[72e7dbc91c3512cd]::query::plumbing::try_execute_query::<rustc_query_impl[60724b15931b629e]::queries::type_of, rustc_query_impl[60724b15931b629e]::plumbing::QueryCtxt>
  72:        0x10ed5a2f0 - <rustc_query_impl[60724b15931b629e]::Queries as rustc_middle[9da08aa6ecd6d5c0]::ty::query::QueryEngine>::type_of
  73:        0x10e014d84 - rustc_hir_analysis[480d2d1e8c0c78d3]::check::check::check_item_type
  74:        0x10e01cdf4 - rustc_hir_analysis[480d2d1e8c0c78d3]::check::check::check_mod_item_types
  75:        0x10ec152e4 - <std[aa9a5926a012de0d]::thread::local::LocalKey<core[504f2899fffd0de7]::cell::Cell<*const ()>>>::with::<rustc_middle[9da08aa6ecd6d5c0]::ty::context::tls::enter_context<rustc_query_system[72e7dbc91c3512cd]::query::plumbing::execute_job_incr<rustc_query_impl[60724b15931b629e]::queries::check_mod_item_types, rustc_query_impl[60724b15931b629e]::plumbing::QueryCtxt>::{closure#2}, (rustc_middle[9da08aa6ecd6d5c0]::query::erase::Erased<[u8; 0usize]>, rustc_query_system[72e7dbc91c3512cd]::dep_graph::graph::DepNodeIndex)>::{closure#0}, (rustc_middle[9da08aa6ecd6d5c0]::query::erase::Erased<[u8; 0usize]>, rustc_query_system[72e7dbc91c3512cd]::dep_graph::graph::DepNodeIndex)>
  76:        0x10eb28dd8 - rustc_query_system[72e7dbc91c3512cd]::query::plumbing::try_execute_query::<rustc_query_impl[60724b15931b629e]::queries::check_mod_item_types, rustc_query_impl[60724b15931b629e]::plumbing::QueryCtxt>
  77:        0x10ed636c0 - <rustc_query_impl[60724b15931b629e]::Queries as rustc_middle[9da08aa6ecd6d5c0]::ty::query::QueryEngine>::check_mod_item_types
  78:        0x10dff3480 - <rustc_session[6471261595ef6f64]::session::Session>::time::<(), rustc_hir_analysis[480d2d1e8c0c78d3]::check_crate::{closure#6}>
  79:        0x10dfb37f0 - rustc_hir_analysis[480d2d1e8c0c78d3]::check_crate
  80:        0x10baab610 - rustc_interface[4abc9379261c4bab]::passes::analysis
  81:        0x10ec5eb54 - <std[aa9a5926a012de0d]::thread::local::LocalKey<core[504f2899fffd0de7]::cell::Cell<*const ()>>>::with::<rustc_middle[9da08aa6ecd6d5c0]::ty::context::tls::enter_context<rustc_query_system[72e7dbc91c3512cd]::query::plumbing::execute_job_incr<rustc_query_impl[60724b15931b629e]::queries::analysis, rustc_query_impl[60724b15931b629e]::plumbing::QueryCtxt>::{closure#2}, (rustc_middle[9da08aa6ecd6d5c0]::query::erase::Erased<[u8; 1usize]>, rustc_query_system[72e7dbc91c3512cd]::dep_graph::graph::DepNodeIndex)>::{closure#0}, (rustc_middle[9da08aa6ecd6d5c0]::query::erase::Erased<[u8; 1usize]>, rustc_query_system[72e7dbc91c3512cd]::dep_graph::graph::DepNodeIndex)>
  82:        0x10eb64b5c - rustc_query_system[72e7dbc91c3512cd]::query::plumbing::try_execute_query::<rustc_query_impl[60724b15931b629e]::queries::analysis, rustc_query_impl[60724b15931b629e]::plumbing::QueryCtxt>
  83:        0x10ed5a978 - <rustc_query_impl[60724b15931b629e]::Queries as rustc_middle[9da08aa6ecd6d5c0]::ty::query::QueryEngine>::analysis
  84:        0x10b9a5b3c - <rustc_interface[4abc9379261c4bab]::queries::QueryResult<&rustc_middle[9da08aa6ecd6d5c0]::ty::context::GlobalCtxt>>::enter::<core[504f2899fffd0de7]::result::Result<(), rustc_span[219dcf8acbb1c73e]::ErrorGuaranteed>, rustc_driver_impl[2b4a73ce5be55b2]::run_compiler::{closure#1}::{closure#2}::{closure#4}>
  85:        0x10b9e1ab8 - <rustc_interface[4abc9379261c4bab]::interface::Compiler>::enter::<rustc_driver_impl[2b4a73ce5be55b2]::run_compiler::{closure#1}::{closure#2}, core[504f2899fffd0de7]::result::Result<core[504f2899fffd0de7]::option::Option<rustc_interface[4abc9379261c4bab]::queries::Linker>, rustc_span[219dcf8acbb1c73e]::ErrorGuaranteed>>
  86:        0x10b9987ec - rustc_span[219dcf8acbb1c73e]::set_source_map::<core[504f2899fffd0de7]::result::Result<(), rustc_span[219dcf8acbb1c73e]::ErrorGuaranteed>, rustc_interface[4abc9379261c4bab]::interface::run_compiler<core[504f2899fffd0de7]::result::Result<(), rustc_span[219dcf8acbb1c73e]::ErrorGuaranteed>, rustc_driver_impl[2b4a73ce5be55b2]::run_compiler::{closure#1}>::{closure#0}::{closure#0}>
  87:        0x10b9a6cfc - <scoped_tls[b7e4fed238ec6414]::ScopedKey<rustc_span[219dcf8acbb1c73e]::SessionGlobals>>::set::<rustc_interface[4abc9379261c4bab]::interface::run_compiler<core[504f2899fffd0de7]::result::Result<(), rustc_span[219dcf8acbb1c73e]::ErrorGuaranteed>, rustc_driver_impl[2b4a73ce5be55b2]::run_compiler::{closure#1}>::{closure#0}, core[504f2899fffd0de7]::result::Result<(), rustc_span[219dcf8acbb1c73e]::ErrorGuaranteed>>
  88:        0x10b997bb8 - std[aa9a5926a012de0d]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[4abc9379261c4bab]::util::run_in_thread_pool_with_globals<rustc_interface[4abc9379261c4bab]::interface::run_compiler<core[504f2899fffd0de7]::result::Result<(), rustc_span[219dcf8acbb1c73e]::ErrorGuaranteed>, rustc_driver_impl[2b4a73ce5be55b2]::run_compiler::{closure#1}>::{closure#0}, core[504f2899fffd0de7]::result::Result<(), rustc_span[219dcf8acbb1c73e]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[504f2899fffd0de7]::result::Result<(), rustc_span[219dcf8acbb1c73e]::ErrorGuaranteed>>
  89:        0x10b99cf98 - <<std[aa9a5926a012de0d]::thread::Builder>::spawn_unchecked_<rustc_interface[4abc9379261c4bab]::util::run_in_thread_pool_with_globals<rustc_interface[4abc9379261c4bab]::interface::run_compiler<core[504f2899fffd0de7]::result::Result<(), rustc_span[219dcf8acbb1c73e]::ErrorGuaranteed>, rustc_driver_impl[2b4a73ce5be55b2]::run_compiler::{closure#1}>::{closure#0}, core[504f2899fffd0de7]::result::Result<(), rustc_span[219dcf8acbb1c73e]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[504f2899fffd0de7]::result::Result<(), rustc_span[219dcf8acbb1c73e]::ErrorGuaranteed>>::{closure#1} as core[504f2899fffd0de7]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  90:        0x10349ce24 - std::sys::unix::thread::Thread::new::thread_start::heeaa880b39b03cd7
  91:        0x1a79f026c - __pthread_deallocate

[Noratrieb]

rust/compiler/rustc_mir_build/src/build/expr/as_place.rs

Lines 256 to 263 in e49122f

	self.try_to_place(cx).unwrap()
	}
	/// Creates a `Place` or returns `None` if an upvar cannot be resolved
	pub(in crate::build) fn try_to_place(&self, cx: &Builder<'_, 'tcx>) -> Option<Place<'tcx>> {
	let resolved = self.resolve_upvar(cx);
	let builder = resolved.as_ref().unwrap_or(self);
	let PlaceBase::Local(local) = builder.base else { return None };

Looks like it can't resolve the closure upvar in MIR building.

[Noratrieb]

bisection shows that this has been broken since ~forever

[conradludgate]

Seems to require edition 2021 capturing

[matthiaskrgr]

might be related to #108683

[clubby789]

Slightly smaller repro

pub struct B;
pub fn a() -> B { B }

mod handlers {
    pub struct C(B);
    pub fn c() -> impl Fn() -> C {
        let a1 = ();
        || C((crate::a(), a1).into())
    }
}

Moving C out of handlers and importing it prevents the ICE.
Similar symptom as #108683 (2021 closure analysis prevent capture of a variable which needs to be captured) but not the same root cause afaict, as there's no patterns in the closure

[apiraino]

WG-prioritization assigning priority (Zulip discussion).

@rustbot label -I-prioritize +P-medium +T-compiler