Closed
Description
Code
//@ compile-flags: --edition=2021 --crate-type lib
fn closure() -> impl AsyncFn() {
async || {
use std::ptr::null;
use std::task::{RawWaker, RawWakerVTable};
RawWaker::new(
null(),
&RawWakerVTable::new(|_| todo!(), |_| (), |_| (), |_| ()),
);
}
}Meta
rustc --version --verbose:
rustc 1.89.0-nightly (e88e85463 2025-05-23)
binary: rustc
commit-hash: e88e85463468ce5d5ce468414eb69e3b15fa8d42
commit-date: 2025-05-23
host: x86_64-unknown-linux-gnu
release: 1.89.0-nightly
LLVM version: 20.1.5
Error output
warning: function `closure` is never used
--> code.rs:1:4
|
1 | fn closure() -> impl AsyncFn() {
| ^^^^^^^
|
= note: `#[warn(dead_code)]` on by default
warning: unused return value of `RawWaker::new` that must be used
--> code.rs:5:9
|
5 | / RawWaker::new(
6 | | null(),
7 | | &RawWakerVTable::new(|_| todo!(), |_| (), |_| (), |_| ()),
8 | | );
| |_________^
|
= note: `#[warn(unused_must_use)]` on by default
help: use `let _ = ...` to ignore the resulting value
|
5 | let _ = RawWaker::new(
| +++++++
Backtrace
error: internal compiler error: compiler/rustc_ty_utils/src/opaque_types.rs:348:13: `opaque_types_defined_by` not defined for synthetic mir body `DefId(0:15 ~ code[6e65]::closure::{closure#0}::{synthetic#0})`
--> code.rs:2:14
|
2 | async || {
| ______________^
3 | | use std::ptr::null;
4 | | use std::task::{RawWaker, RawWakerVTable};
5 | | RawWaker::new(
... |
8 | | );
9 | | }
| |_____^
thread 'rustc' panicked at compiler/rustc_ty_utils/src/opaque_types.rs:348:13:
Box<dyn Any>
stack backtrace:
0: 0x7e50f756e073 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::h03779a6f0d0528fb
1: 0x7e50f7c05ab7 - core::fmt::write::h37188b143c8299db
2: 0x7e50f9066fd1 - std::io::Write::write_fmt::hf33b730412790e29
3: 0x7e50f756ded2 - std::sys::backtrace::BacktraceLock::print::hbc62909c49e926d5
4: 0x7e50f7571aca - std::panicking::default_hook::{{closure}}::h30d9b30f64bce3ec
5: 0x7e50f757164f - std::panicking::default_hook::hc1d74f335a317740
6: 0x7e50f659a363 - std[72f0f555f0ececc7]::panicking::update_hook::<alloc[3d9b53f579cadf77]::boxed::Box<rustc_driver_impl[52f955853b1bdd09]::install_ice_hook::{closure#1}>>::{closure#0}
7: 0x7e50f7572343 - std::panicking::rust_panic_with_hook::hd85f4b59c2a8b76a
8: 0x7e50f65d61b1 - std[72f0f555f0ececc7]::panicking::begin_panic::<rustc_errors[58cd91a829d19a54]::ExplicitBug>::{closure#0}
9: 0x7e50f65ca1e6 - std[72f0f555f0ececc7]::sys::backtrace::__rust_end_short_backtrace::<std[72f0f555f0ececc7]::panicking::begin_panic<rustc_errors[58cd91a829d19a54]::ExplicitBug>::{closure#0}, !>
10: 0x7e50f65ca077 - std[72f0f555f0ececc7]::panicking::begin_panic::<rustc_errors[58cd91a829d19a54]::ExplicitBug>
11: 0x7e50f65e0921 - <rustc_errors[58cd91a829d19a54]::diagnostic::BugAbort as rustc_errors[58cd91a829d19a54]::diagnostic::EmissionGuarantee>::emit_producing_guarantee
12: 0x7e50f6baff1c - <rustc_errors[58cd91a829d19a54]::DiagCtxtHandle>::span_bug::<rustc_span[5d0591bc0b087f3b]::span_encoding::Span, alloc[3d9b53f579cadf77]::string::String>
13: 0x7e50f6c4b3a7 - rustc_middle[c34ff90c6f2112aa]::util::bug::opt_span_bug_fmt::<rustc_span[5d0591bc0b087f3b]::span_encoding::Span>::{closure#0}
14: 0x7e50f6c25dda - rustc_middle[c34ff90c6f2112aa]::ty::context::tls::with_opt::<rustc_middle[c34ff90c6f2112aa]::util::bug::opt_span_bug_fmt<rustc_span[5d0591bc0b087f3b]::span_encoding::Span>::{closure#0}, !>::{closure#0}
15: 0x7e50f6c25c4b - rustc_middle[c34ff90c6f2112aa]::ty::context::tls::with_context_opt::<rustc_middle[c34ff90c6f2112aa]::ty::context::tls::with_opt<rustc_middle[c34ff90c6f2112aa]::util::bug::opt_span_bug_fmt<rustc_span[5d0591bc0b087f3b]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
16: 0x7e50f56e1b37 - rustc_middle[c34ff90c6f2112aa]::util::bug::span_bug_fmt::<rustc_span[5d0591bc0b087f3b]::span_encoding::Span>
17: 0x7e50f80f830f - rustc_ty_utils[906cc961ec565acf]::opaque_types::opaque_types_defined_by
18: 0x7e50f80f7b9b - rustc_query_impl[a210f1cfd61f5ef1]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[a210f1cfd61f5ef1]::query_impl::opaque_types_defined_by::dynamic_query::{closure#2}::{closure#0}, rustc_middle[c34ff90c6f2112aa]::query::erase::Erased<[u8; 8usize]>>
19: 0x7e50f7dd7b66 - rustc_query_system[26848a8fb0a689fb]::query::plumbing::try_execute_query::<rustc_query_impl[a210f1cfd61f5ef1]::DynamicConfig<rustc_data_structures[b478411c3a8316d9]::vec_cache::VecCache<rustc_span[5d0591bc0b087f3b]::def_id::LocalDefId, rustc_middle[c34ff90c6f2112aa]::query::erase::Erased<[u8; 8usize]>, rustc_query_system[26848a8fb0a689fb]::dep_graph::graph::DepNodeIndex>, false, false, false>, rustc_query_impl[a210f1cfd61f5ef1]::plumbing::QueryCtxt, false>
20: 0x7e50f7dd7752 - rustc_query_impl[a210f1cfd61f5ef1]::query_impl::opaque_types_defined_by::get_query_non_incr::__rust_end_short_backtrace
21: 0x7e50f99d2f1b - <rustc_middle[c34ff90c6f2112aa]::ty::context::TyCtxt as rustc_type_ir[eb6680b263ba7d43]::interner::Interner>::opaque_types_defined_by.cold
22: 0x7e50f7c28753 - <rustc_const_eval[c28c0ff2b603dd2d]::check_consts::qualifs::HasMutInterior as rustc_const_eval[c28c0ff2b603dd2d]::check_consts::qualifs::Qualif>::in_any_value_of_ty
23: 0x7e50f8508120 - <alloc[3d9b53f579cadf77]::vec::Vec<rustc_mir_transform[a6343ba8374f461]::promote_consts::Candidate>>::retain::<rustc_mir_transform[a6343ba8374f461]::promote_consts::validate_candidates::{closure#0}>::{closure#0}
24: 0x7e50f514886a - <rustc_mir_transform[a6343ba8374f461]::promote_consts::PromoteTemps as rustc_mir_transform[a6343ba8374f461]::pass_manager::MirPass>::run_pass
25: 0x7e50f51bb7ee - rustc_mir_transform[a6343ba8374f461]::mir_promoted
26: 0x7e50f7fdcb12 - rustc_query_impl[a210f1cfd61f5ef1]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[a210f1cfd61f5ef1]::query_impl::mir_promoted::dynamic_query::{closure#2}::{closure#0}, rustc_middle[c34ff90c6f2112aa]::query::erase::Erased<[u8; 16usize]>>
27: 0x7e50f7fdcdb6 - rustc_query_system[26848a8fb0a689fb]::query::plumbing::try_execute_query::<rustc_query_impl[a210f1cfd61f5ef1]::DynamicConfig<rustc_data_structures[b478411c3a8316d9]::vec_cache::VecCache<rustc_span[5d0591bc0b087f3b]::def_id::LocalDefId, rustc_middle[c34ff90c6f2112aa]::query::erase::Erased<[u8; 16usize]>, rustc_query_system[26848a8fb0a689fb]::dep_graph::graph::DepNodeIndex>, false, false, false>, rustc_query_impl[a210f1cfd61f5ef1]::plumbing::QueryCtxt, false>
28: 0x7e50f7fdc952 - rustc_query_impl[a210f1cfd61f5ef1]::query_impl::mir_promoted::get_query_non_incr::__rust_end_short_backtrace
29: 0x7e50f6e42eed - rustc_mir_transform[a6343ba8374f461]::coroutine::mir_coroutine_witnesses
30: 0x7e50f704ba7f - rustc_query_impl[a210f1cfd61f5ef1]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[a210f1cfd61f5ef1]::query_impl::mir_coroutine_witnesses::dynamic_query::{closure#2}::{closure#0}, rustc_middle[c34ff90c6f2112aa]::query::erase::Erased<[u8; 8usize]>>
31: 0x7e50f809603f - rustc_query_system[26848a8fb0a689fb]::query::plumbing::try_execute_query::<rustc_query_impl[a210f1cfd61f5ef1]::DynamicConfig<rustc_query_system[26848a8fb0a689fb]::query::caches::DefIdCache<rustc_middle[c34ff90c6f2112aa]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[a210f1cfd61f5ef1]::plumbing::QueryCtxt, false>
32: 0x7e50f7054bb8 - rustc_query_impl[a210f1cfd61f5ef1]::query_impl::mir_coroutine_witnesses::get_query_non_incr::__rust_end_short_backtrace
33: 0x7e50f7dc5e39 - rustc_mir_transform[a6343ba8374f461]::mir_drops_elaborated_and_const_checked
34: 0x7e50f7dc5119 - rustc_query_impl[a210f1cfd61f5ef1]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[a210f1cfd61f5ef1]::query_impl::mir_drops_elaborated_and_const_checked::dynamic_query::{closure#2}::{closure#0}, rustc_middle[c34ff90c6f2112aa]::query::erase::Erased<[u8; 8usize]>>
35: 0x7e50f7dd7b66 - rustc_query_system[26848a8fb0a689fb]::query::plumbing::try_execute_query::<rustc_query_impl[a210f1cfd61f5ef1]::DynamicConfig<rustc_data_structures[b478411c3a8316d9]::vec_cache::VecCache<rustc_span[5d0591bc0b087f3b]::def_id::LocalDefId, rustc_middle[c34ff90c6f2112aa]::query::erase::Erased<[u8; 8usize]>, rustc_query_system[26848a8fb0a689fb]::dep_graph::graph::DepNodeIndex>, false, false, false>, rustc_query_impl[a210f1cfd61f5ef1]::plumbing::QueryCtxt, false>
36: 0x7e50f7dd69d2 - rustc_query_impl[a210f1cfd61f5ef1]::query_impl::mir_drops_elaborated_and_const_checked::get_query_non_incr::__rust_end_short_backtrace
37: 0x7e50f86d8e51 - rustc_mir_transform[a6343ba8374f461]::optimized_mir
38: 0x7e50f86d87bb - rustc_query_impl[a210f1cfd61f5ef1]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[a210f1cfd61f5ef1]::query_impl::optimized_mir::dynamic_query::{closure#2}::{closure#0}, rustc_middle[c34ff90c6f2112aa]::query::erase::Erased<[u8; 8usize]>>
39: 0x7e50f809603f - rustc_query_system[26848a8fb0a689fb]::query::plumbing::try_execute_query::<rustc_query_impl[a210f1cfd61f5ef1]::DynamicConfig<rustc_query_system[26848a8fb0a689fb]::query::caches::DefIdCache<rustc_middle[c34ff90c6f2112aa]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[a210f1cfd61f5ef1]::plumbing::QueryCtxt, false>
40: 0x7e50f8095462 - rustc_query_impl[a210f1cfd61f5ef1]::query_impl::optimized_mir::get_query_non_incr::__rust_end_short_backtrace
41: 0x7e50f817e6d7 - <rustc_metadata[b94d7ace3b1283ef]::rmeta::encoder::EncodeContext>::encode_crate_root
42: 0x7e50f8bb9994 - rustc_metadata[b94d7ace3b1283ef]::rmeta::encoder::encode_metadata
43: 0x7e50f89fba73 - rustc_metadata[b94d7ace3b1283ef]::fs::encode_and_write_metadata
44: 0x7e50f8d51444 - <rustc_interface[683f45d0a04ac5b6]::queries::Linker>::codegen_and_build_linker
45: 0x7e50f8d4f0b8 - rustc_interface[683f45d0a04ac5b6]::passes::create_and_enter_global_ctxt::<core[5de45699eb5b5ad3]::option::Option<rustc_interface[683f45d0a04ac5b6]::queries::Linker>, rustc_driver_impl[52f955853b1bdd09]::run_compiler::{closure#0}::{closure#2}>::{closure#2}::{closure#0}
46: 0x7e50f8caa28f - rustc_interface[683f45d0a04ac5b6]::interface::run_compiler::<(), rustc_driver_impl[52f955853b1bdd09]::run_compiler::{closure#0}>::{closure#1}
47: 0x7e50f8c64986 - std[72f0f555f0ececc7]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[683f45d0a04ac5b6]::util::run_in_thread_with_globals<rustc_interface[683f45d0a04ac5b6]::util::run_in_thread_pool_with_globals<rustc_interface[683f45d0a04ac5b6]::interface::run_compiler<(), rustc_driver_impl[52f955853b1bdd09]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
48: 0x7e50f8c6462b - <<std[72f0f555f0ececc7]::thread::Builder>::spawn_unchecked_<rustc_interface[683f45d0a04ac5b6]::util::run_in_thread_with_globals<rustc_interface[683f45d0a04ac5b6]::util::run_in_thread_pool_with_globals<rustc_interface[683f45d0a04ac5b6]::interface::run_compiler<(), rustc_driver_impl[52f955853b1bdd09]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core[5de45699eb5b5ad3]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
49: 0x7e50f8c6597d - std::sys::pal::unix::thread::Thread::new::thread_start::hb186a50e9c63d629
50: 0x7e50f2aa57eb - <unknown>
51: 0x7e50f2b2918c - <unknown>
52: 0x0 - <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 make sure that you have updated to the latest nightly
note: please attach the file at `/home/matthias/vcs/github/CRED/rustc-ice-2025-05-23T19_15_30-3104862.txt` to your bug report
note: compiler flags: --crate-type lib
query stack during panic:
#0 [opaque_types_defined_by] computing the opaque types defined by `closure::{closure#0}::{synthetic#0}`
#1 [mir_promoted] promoting constants in MIR for `closure::{closure#0}::{synthetic#0}`
#2 [mir_coroutine_witnesses] coroutine witness types for `closure::{closure#0}::{synthetic#0}`
#3 [mir_drops_elaborated_and_const_checked] elaborating drops for `closure::{closure#0}::{synthetic#0}`
#4 [optimized_mir] optimizing MIR for `closure::{closure#0}::{synthetic#0}`
end of query stack
error: aborting due to 1 previous error; 2 warnings emitted