Repository navigation
ICE when using async block form of async closure #121306
Description
Code
#![feature(async_closure)]
#[allow(unused_must_use)]
fn foo(f: impl async FnOnce()) {
f();
}
pub fn main() {
foo(|| async move {});
}Importantly note that the closure passed to foo is || async move {}; async move || {} does not ICE.
Meta
rustc --version --verbose:
rustc 1.78.0-nightly (2bf78d12d 2024-02-18)
binary: rustc
commit-hash: 2bf78d12d33ae02d10010309a0d85dd04e7cff72
commit-date: 2024-02-18
host: x86_64-unknown-linux-gnu
release: 1.78.0-nightly
LLVM version: 18.1.0
Error output
thread 'rustc' panicked at compiler/rustc_ty_utils/src/instance.rs:327:90:
called `Option::unwrap()` on a `None` value
[...]
query stack during panic:
#0 [resolve_instance] resolving instance `<{closure@src/lib.rs:9:10: 9:12} as core::ops::async_function::AsyncFnOnce<()>>::async_call_once`
#1 [collect_and_partition_mono_items] collect_and_partition_mono_items
#2 [exported_symbols] collecting exported symbols for crate `0`
end of query stack
Backtrace
thread 'rustc' panicked at compiler/rustc_ty_utils/src/instance.rs:327:90:
called `Option::unwrap()` on a `None` value
stack backtrace:
0: rust_begin_unwind
at /rustc/2bf78d12d33ae02d10010309a0d85dd04e7cff72/library/std/src/panicking.rs:648:5
1: core::panicking::panic_fmt
at /rustc/2bf78d12d33ae02d10010309a0d85dd04e7cff72/library/core/src/panicking.rs:72:14
2: core::panicking::panic
at /rustc/2bf78d12d33ae02d10010309a0d85dd04e7cff72/library/core/src/panicking.rs:144:5
3: core::option::unwrap_failed
at /rustc/2bf78d12d33ae02d10010309a0d85dd04e7cff72/library/core/src/option.rs:1983:5
4: rustc_ty_utils::instance::resolve_instance
[... omitted 1 frame ...]
5: <rustc_middle::ty::instance::Instance>::expect_resolve
6: rustc_monomorphize::collector::collect_items_rec::{closure#0}
7: rustc_monomorphize::collector::collect_items_rec
8: rustc_monomorphize::collector::collect_items_rec
9: rustc_monomorphize::partitioning::collect_and_partition_mono_items
[... omitted 2 frames ...]
10: rustc_codegen_ssa::back::symbol_export::exported_symbols_provider_local
[... omitted 2 frames ...]
11: rustc_middle::query::plumbing::query_get_at::<rustc_query_system::query::caches::VecCache<rustc_span::def_id::CrateNum, rustc_middle::query::erase::Erased<[u8; 16]>>>
12: <rustc_metadata::rmeta::encoder::EncodeContext>::encode_crate_root
13: rustc_metadata::rmeta::encoder::encode_metadata
14: rustc_metadata::fs::encode_and_write_metadata
15: rustc_interface::passes::start_codegen
16: <rustc_interface::queries::Queries>::codegen_and_build_linker
17: 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 `/home/jpr/ice/rustc-ice-2024-02-19T14_48_02-1138692.txt` to your bug report
note: compiler flags: --crate-type lib -C embed-bitcode=no -C debuginfo=2 -C linker=clang -C incremental=[REDACTED] -C link-arg=-fuse-ld=lld
note: some of the compiler flags provided by cargo are hidden
query stack during panic:
#0 [resolve_instance] resolving instance `<{closure@src/lib.rs:9:10: 9:12} as core::ops::async_function::AsyncFnOnce<()>>::async_call_once`
#1 [collect_and_partition_mono_items] collect_and_partition_mono_items
#2 [exported_symbols] collecting exported symbols for crate `0`
end of query stack
error: could not compile `ice` (lib)
Activity
GrigorenkoPV commentedon Feb 19, 2024
Regression in 757b8ef (#120712)
Rollup merge of rust-lang#121350 - compiler-errors:resolve, r=oli-obk
Unrolled build for rust-lang#121350