rustc_codegen_cranelift
rustc_codegen_cranelift copied to clipboard
rust-lang
ICE `ArgAbi left behind`
[31mICE[0m: Rustc ./a.rs '--edition=2024 -Zcodegen-backend=cranelift -Clink-dead-code=true -Zcrate-attr=feature(async_drop) -Zcrate-attr=feature(gen_blocks) -ooutputfile -Zdump-mir-dir=dir' 'thread 'rustc' ($TID) panicked at compiler/rustc_codegen_cranelift/src/abi/mod.rs:299:5: 'ArgAbi left behind'', 'thread 'rustc' ($TID) panicked at compiler/rustc_codegen_cranelift/src/abi/mod.rs:299:5: 'ArgAbi left behind'' File: /tmp/im/a.rs -->
auto-reduced (treereduce-rust):
//@compile-flags: --edition=2024 -Zcodegen-backend=cranelift -Clink-dead-code=true
#![feature(async_drop)]
#![feature(gen_blocks)]
fn main() {
let _ = async {
let mut gn = gen {
yield 1;
2.yield;
};
};
}
original:
//@ incremental
//@ edition:2021
fn main() {
let _ = async {
let mut gn = gen {
yield 1;
2.yield;
};
//~^ ERROR `[(); _]` is not a future
};
}
Version information
rustc 1.91.0-nightly (8e3710ef3 2025-08-21)
binary: rustc
commit-hash: 8e3710ef31a0b2cdf5a1c2f3929b7735d1e28c20
commit-date: 2025-08-21
host: x86_64-unknown-linux-gnu
release: 1.91.0-nightly
LLVM version: 21.1.0
Possibly related line of code: https://github.com/rust-lang/rust/blob/8e3710ef31a0b2cdf5a1c2f3929b7735d1e28c20/compiler/rustc_codegen_cranelift/src/abi/mod.rs#L293-L305
Command:
/home/matthias/.rustup/toolchains/master/bin/rustc --edition=2024 -Zcodegen-backend=cranelift -Clink-dead-code=true -Zcrate-attr=feature(async_drop) -Zcrate-attr=feature(gen_blocks)
Program output
warning: the feature `async_drop` is incomplete and may not be safe to use and/or cause compiler crashes
--> <crate attribute>:1:12
|
1 | #![feature(async_drop)]
| ^^^^^^^^^^
|
= note: see issue #126482 <https://github.com/rust-lang/rust/issues/126482> for more information
= note: `#[warn(incomplete_features)]` on by default
warning: unused variable: `gn`
--> /tmp/icemaker_global_tempdir.XM6ODE5Hjm0Y/rustc_testrunner_tmpdir_reporting.12FJUATdHBlM/mvce.rs:6:17
|
6 | let mut gn = gen {
| ^^ help: if this is intentional, prefix it with an underscore: `_gn`
|
= note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
warning: variable does not need to be mutable
--> /tmp/icemaker_global_tempdir.XM6ODE5Hjm0Y/rustc_testrunner_tmpdir_reporting.12FJUATdHBlM/mvce.rs:6:13
|
6 | let mut gn = gen {
| ----^^
| |
| help: remove this `mut`
|
= note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
thread 'rustc' (29598) panicked at compiler/rustc_codegen_cranelift/src/abi/mod.rs:299:5:
ArgAbi left behind
stack backtrace:
0: 0x7fca4022f453 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::h29956387916c7786
1: 0x7fca40a019d8 - core::fmt::write::hc643e33fb3701c04
2: 0x7fca40219d23 - std::io::Write::write_fmt::hd8aafd7e0cfa4df0
3: 0x7fca4022ee02 - std::sys::backtrace::BacktraceLock::print::h7b608780239e41bb
4: 0x7fca4020fe8e - std::panicking::default_hook::{{closure}}::hb985d7a9c8441027
5: 0x7fca4020f9b8 - std::panicking::default_hook::h21dd4ceb358d35d5
6: 0x7fca3f283575 - std[7bbd1c520933e2ca]::panicking::update_hook::<alloc[d048b985160d5cb3]::boxed::Box<rustc_driver_impl[43f25b9ba173297b]::install_ice_hook::{closure#1}>>::{closure#0}
7: 0x7fca4020f784 - std::panicking::panic_with_hook::h9e10def7ecb801dd
8: 0x7fca4022f226 - std::panicking::panic_handler::{{closure}}::hcae2f26048275696
9: 0x7fca4022f1b9 - std::sys::backtrace::__rust_end_short_backtrace::h391fe1ff395ba1e0
10: 0x7fca4020f8ed - __rustc[27a96dd388c4db29]::rust_begin_unwind
11: 0x7fca3c8d9840 - core::panicking::panic_fmt::hae068153d2f804a4
12: 0x7fca2ea3169f - rustc_codegen_cranelift[72d6c50d52a4b85d]::base::codegen_fn_body
13: 0x7fca2ea51409 - rustc_codegen_cranelift[72d6c50d52a4b85d]::driver::aot::codegen_cgu_content
14: 0x7fca2ea5e4fc - rustc_codegen_cranelift[72d6c50d52a4b85d]::driver::aot::module_codegen
15: 0x7fca2eaa9ad9 - rustc_codegen_cranelift[72d6c50d52a4b85d]::driver::aot::run_aot::{closure#3}::{closure#0}
16: 0x7fca2ea16c89 - <core[944e8f57fc60541e]::iter::adapters::filter_map::FilterMap<alloc[d048b985160d5cb3]::vec::into_iter::IntoIter<(usize, &rustc_middle[984f359684f14d51]::mir::mono::CodegenUnit)>, rustc_data_structures[1992400ef1c04f10]::sync::parallel::par_map<(usize, &rustc_middle[984f359684f14d51]::mir::mono::CodegenUnit), alloc[d048b985160d5cb3]::vec::Vec<(usize, &rustc_middle[984f359684f14d51]::mir::mono::CodegenUnit)>, rustc_data_structures[1992400ef1c04f10]::marker::IntoDynSyncSend<rustc_codegen_cranelift[72d6c50d52a4b85d]::driver::aot::OngoingModuleCodegen>, alloc[d048b985160d5cb3]::vec::Vec<rustc_data_structures[1992400ef1c04f10]::marker::IntoDynSyncSend<rustc_codegen_cranelift[72d6c50d52a4b85d]::driver::aot::OngoingModuleCodegen>>, rustc_codegen_cranelift[72d6c50d52a4b85d]::driver::aot::run_aot::{closure#3}::{closure#0}>::{closure#0}::{closure#3}> as core[944e8f57fc60541e]::iter::traits::iterator::Iterator>::next
17: 0x7fca2ea59413 - rustc_codegen_cranelift[72d6c50d52a4b85d]::driver::aot::run_aot
18: 0x7fca2ea7139e - <rustc_codegen_cranelift[72d6c50d52a4b85d]::CraneliftCodegenBackend as rustc_codegen_ssa[8c7a150851651b0c]::traits::backend::CodegenBackend>::codegen_crate
19: 0x7fca41dacd30 - <rustc_interface[7f26a336caf35539]::queries::Linker>::codegen_and_build_linker
20: 0x7fca41daa8bc - rustc_interface[7f26a336caf35539]::passes::create_and_enter_global_ctxt::<core[944e8f57fc60541e]::option::Option<rustc_interface[7f26a336caf35539]::queries::Linker>, rustc_driver_impl[43f25b9ba173297b]::run_compiler::{closure#0}::{closure#2}>::{closure#2}::{closure#0}
21: 0x7fca41bb8fdf - rustc_interface[7f26a336caf35539]::interface::run_compiler::<(), rustc_driver_impl[43f25b9ba173297b]::run_compiler::{closure#0}>::{closure#1}
22: 0x7fca41b2c638 - std[7bbd1c520933e2ca]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[7f26a336caf35539]::util::run_in_thread_with_globals<rustc_interface[7f26a336caf35539]::util::run_in_thread_pool_with_globals<rustc_interface[7f26a336caf35539]::interface::run_compiler<(), rustc_driver_impl[43f25b9ba173297b]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
23: 0x7fca41b2c31c - <<std[7bbd1c520933e2ca]::thread::Builder>::spawn_unchecked_<rustc_interface[7f26a336caf35539]::util::run_in_thread_with_globals<rustc_interface[7f26a336caf35539]::util::run_in_thread_pool_with_globals<rustc_interface[7f26a336caf35539]::interface::run_compiler<(), rustc_driver_impl[43f25b9ba173297b]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core[944e8f57fc60541e]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
24: 0x7fca41b3238d - std::sys::pal::unix::thread::Thread::new::thread_start::h67ffc5859d05944d
25: 0x7fca3b2969cb - <unknown>
26: 0x7fca3b31aa4c - <unknown>
27: 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 make sure that you have updated to the latest nightly
note: rustc 1.91.0-nightly (8e3710ef3 2025-08-21) running on x86_64-unknown-linux-gnu
note: compiler flags: -Z codegen-backend=cranelift -C link-dead-code=true -Z crate-attr=feature(async_drop) -Z crate-attr=feature(gen_blocks) -Z dump-mir-dir=dir
query stack during panic:
end of query stack
warning: 3 warnings emitted
@rustbot label +F-async_drop +F-gen_blocks
Error: The feature relabel is not enabled in this repository.
To enable it add its section in the triagebot.toml in the root of the repository.
Please file an issue on GitHub at triagebot if there's a problem with this bot, or reach out on #triagebot on Zulip.
#![feature(async_drop)]
#![feature(gen_blocks)]
fn main() {
let mut gn = gen {
yield 1;
};
let _ = std::pin::pin!(unsafe { std::future::async_drop_in_place(&mut gn) })
.poll(&mut std::task::Context::from_waker(std::task::Waker::noop()));
}
reproduces this without -Clink-dead-code=yes.
