ICE: `compiler/rustc_mir_build/src/build/expr/as_place.rs` `fn to_place` None

[cushionbadak]

Code

(slightly reduced)

#![crate_type = "lib"]

pub fn a() {}

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

(original code)

Code

// ICE in mir building with captured value of unresolved type
// None in compiler/rustc_mir_build/src/build/expr/as_place.rs
// issue: rust-lang/rust#110453
//@ edition:2021

#![crate_type="lib"]

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

mod handlers {
    pub struct C(&'a ());
    //~^ ERROR cannot find type `B` in this scope
    pub fn c() -> impl Fn() -> C {
        let a1 = ();
        || C((crate::a(), a1).into())
    }
}

Note

• I guess the ICE-causing original code is mutated from rustc mir-build testscase,
  • where the original struct definition pub struct C(B); has been modified to pub struct C(&'a ());.

Meta

rustc --version --verbose:

rustc 1.79.0-nightly (8df7e723e 2024-03-30)
binary: rustc
commit-hash: 8df7e723ea729a7f917501cc2d91d640b7021373
commit-date: 2024-03-30
host: x86_64-apple-darwin
release: 1.79.0-nightly
LLVM version: 18.1.2

Command

rustc --edition=2021

Error output

error[E0106]: missing lifetime specifier
 --> reduced_66B4F29C3A73E1402A5F012317DC752A09758EA84D1682C6AA92AEB993764FAA.rs:6:18
  |
6 |     pub struct C(&());
  |                  ^ expected named lifetime parameter
  |
help: consider introducing a named lifetime parameter
  |
6 |     pub struct C<'a>(&'a ());
  |                 ++++  ++

Backtrace

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: _rust_begin_unwind
   1: core::panicking::panic_fmt
   2: core::panicking::panic
   3: core::option::unwrap_failed
   4: <rustc_mir_build::build::Builder>::expr_into_dest
   5: <rustc_mir_build::build::Builder>::as_temp_inner
   6: <rustc_mir_build::build::Builder>::as_operand
   7: <rustc_mir_build::build::Builder>::as_operand
   8: <rustc_mir_build::build::Builder>::as_rvalue
   9: <rustc_mir_build::build::Builder>::expr_into_dest
  10: <rustc_mir_build::build::Builder>::as_temp_inner
  11: <rustc_mir_build::build::Builder>::as_operand
  12: <rustc_mir_build::build::Builder>::as_call_operand
  13: <rustc_mir_build::build::Builder>::as_call_operand
  14: <rustc_mir_build::build::Builder>::expr_into_dest
  15: <rustc_mir_build::build::Builder>::as_temp_inner
  16: <rustc_mir_build::build::Builder>::as_operand
  17: <rustc_mir_build::build::Builder>::as_operand
  18: <rustc_mir_build::build::Builder>::expr_into_dest
  19: <rustc_mir_build::build::Builder>::expr_into_dest::{closure#0}
  20: <rustc_mir_build::build::Builder>::expr_into_dest
  21: rustc_mir_build::build::construct_fn
  22: rustc_mir_build::build::mir_build
  23: rustc_mir_transform::mir_built
      [... omitted 1 frame ...]
  24: 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]>>>
  25: rustc_mir_transform::ffi_unwind_calls::has_ffi_unwind_calls
      [... omitted 1 frame ...]
  26: rustc_mir_transform::mir_promoted
      [... omitted 2 frames ...]
  27: rustc_middle::query::plumbing::query_get_at::<rustc_query_system::query::caches::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::Erased<[u8; 16]>>>
  28: rustc_borrowck::mir_borrowck
      [... omitted 1 frame ...]
  29: 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]>>>
  30: <rustc_borrowck::type_check::TypeChecker>::prove_closure_bounds
  31: <rustc_borrowck::type_check::TypeChecker>::check_rvalue
  32: <rustc_borrowck::type_check::TypeChecker>::typeck_mir
  33: rustc_borrowck::type_check::type_check
  34: rustc_borrowck::nll::compute_regions
  35: rustc_borrowck::do_mir_borrowck
  36: rustc_borrowck::mir_borrowck
      [... omitted 1 frame ...]
  37: 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]>>>
  38: rustc_hir_analysis::collect::type_of::type_of_opaque
      [... omitted 1 frame ...]
  39: rustc_middle::query::plumbing::query_get_at::<rustc_query_system::query::caches::DefIdCache<rustc_middle::query::erase::Erased<[u8; 8]>>>
  40: rustc_hir_analysis::collect::type_of::type_of
      [... omitted 1 frame ...]
  41: rustc_middle::query::plumbing::query_get_at::<rustc_query_system::query::caches::DefIdCache<rustc_middle::query::erase::Erased<[u8; 8]>>>
  42: rustc_hir_analysis::check::check::check_item_type
  43: rustc_hir_analysis::check::wfcheck::check_well_formed
      [... omitted 1 frame ...]
  44: rustc_middle::query::plumbing::query_ensure_error_guaranteed::<rustc_query_system::query::caches::VecCache<rustc_hir::hir_id::OwnerId, rustc_middle::query::erase::Erased<[u8; 1]>>, ()>
  45: rustc_hir_analysis::check::wfcheck::check_mod_type_wf
      [... omitted 1 frame ...]
  46: rustc_hir_analysis::check_crate
  47: rustc_interface::passes::analysis
      [... omitted 1 frame ...]
  48: <rustc_interface::queries::QueryResult<&rustc_middle::ty::context::GlobalCtxt>>::enter::<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#0}::{closure#1}::{closure#3}>
  49: rustc_interface::interface::run_compiler::<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#0}>::{closure#0}
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

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 `/Volumes/T7/workspace/placeholder_rustexec/0329/rustc-ice-2024-03-31T03_52_25-27883.txt` to your bug report

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

For more information about this error, try `rustc --explain E0106`.

Related Issues

• This issue's ICE-loc
• Pruning a dependency results in a confused compiler #118468 (ICE-loc) linked to the same ICE location, currently lacks an MCVE and has not seen updates for a while. (and has different query stack)
• ICE: called Option::unwrap() on a None value #115658 (ICE-loc) also points to the same ICE location.

[matthiaskrgr]

Looks like a duplicate of #123157

[cushionbadak]

Looks like a duplicate of #123157

Oh, I missed that one 😅
Should I close this issue as not-planned?