ICE: `debuginfo: Trying to create type name for unexpected type: CoroutineWitness`

[matthiaskrgr]

Code

rustc --edition=2021 -Cdebuginfo=2

#![feature(async_closure, noop_waker, async_fn_traits)]

use std::future::Future;
use std::pin::pin;
use std::task::*;

pub fn block_on<T>(fut: impl Future<Output = T>) -> T {
    let mut fut = pin!(fut);
    let ctx = &mut Context::from_waker(Waker::noop());

    loop {
        match fut.as_mut().poll(ctx) {
            Poll::Pending => {}
            Poll::Ready(t) => break t,
        }
    }
}

async fn call_once(f: impl async FnOnce(DropMe)) {
    f(DropMe("world")).await;
}

#[derive(Debug)]
struct DropMe(&'static str);

impl Drop for DropMe {
    fn drop(&mut self) {
        println!("{}", self.0);
    }
}

pub fn main() {
    block_on(async {
        let b = DropMe("hello");
        let async_closure = async move |a: DropMe| {
            println!("{a:?} {b:?}");
        };
        call_once(async_closure).await;
    });
}

Meta

rustc --version --verbose:

rustc 1.82.0-nightly (ac77e88f7 2024-08-28)
binary: rustc
commit-hash: ac77e88f7a84e20311f5518e34c806503d586c1c
commit-date: 2024-08-28
host: x86_64-unknown-linux-gnu
release: 1.82.0-nightly
LLVM version: 19.1.0

Error output

<output>

Backtrace

error: internal compiler error: compiler/rustc_codegen_ssa/src/debuginfo/type_names.rs:447:13: debuginfo: Trying to create type name for unexpected type: CoroutineWitness(DefId(0:15 ~ async_closure_drop[f75a]::main::{closure#0}::{closure#0}::{closure#0}), [])

thread 'rustc' panicked at compiler/rustc_codegen_ssa/src/debuginfo/type_names.rs:447:13:
Box<dyn Any>
stack backtrace:
   0:     0x731b947eb32d - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::h7db77851e9ebb774
   1:     0x731b950031d7 - core::fmt::write::h9cfbdc571e0dc2eb
   2:     0x731b95fd9c91 - std::io::Write::write_fmt::h3ab32c8206ff30b6
   3:     0x731b947eda0b - std::panicking::default_hook::{{closure}}::h38e1e6aafa3385ea
   4:     0x731b947ed67e - std::panicking::default_hook::h128e065af5edc5f1
   5:     0x731b9394ff99 - std[1420b3a934c096b7]::panicking::update_hook::<alloc[e966b72f101d6e3b]::boxed::Box<rustc_driver_impl[bb501fee5761e404]::install_ice_hook::{closure#0}>>::{closure#0}
   6:     0x731b947ee327 - std::panicking::rust_panic_with_hook::h3da31308f8371ddd
   7:     0x731b9398a1e1 - std[1420b3a934c096b7]::panicking::begin_panic::<rustc_errors[975dcf607b16fe9a]::ExplicitBug>::{closure#0}
   8:     0x731b9397d8a6 - std[1420b3a934c096b7]::sys::backtrace::__rust_end_short_backtrace::<std[1420b3a934c096b7]::panicking::begin_panic<rustc_errors[975dcf607b16fe9a]::ExplicitBug>::{closure#0}, !>
   9:     0x731b93978bf6 - std[1420b3a934c096b7]::panicking::begin_panic::<rustc_errors[975dcf607b16fe9a]::ExplicitBug>
  10:     0x731b93993401 - <rustc_errors[975dcf607b16fe9a]::diagnostic::BugAbort as rustc_errors[975dcf607b16fe9a]::diagnostic::EmissionGuarantee>::emit_producing_guarantee
  11:     0x731b93f5b064 - rustc_middle[8198af3142fd3a9]::util::bug::opt_span_bug_fmt::<rustc_span[b2ae2de433ea6577]::span_encoding::Span>::{closure#0}
  12:     0x731b93f412ea - rustc_middle[8198af3142fd3a9]::ty::context::tls::with_opt::<rustc_middle[8198af3142fd3a9]::util::bug::opt_span_bug_fmt<rustc_span[b2ae2de433ea6577]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  13:     0x731b93f4119b - rustc_middle[8198af3142fd3a9]::ty::context::tls::with_context_opt::<rustc_middle[8198af3142fd3a9]::ty::context::tls::with_opt<rustc_middle[8198af3142fd3a9]::util::bug::opt_span_bug_fmt<rustc_span[b2ae2de433ea6577]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  14:     0x731b91ac8f80 - rustc_middle[8198af3142fd3a9]::util::bug::bug_fmt
  15:     0x731b957a3293 - rustc_codegen_ssa[6619af2d2b318611]::debuginfo::type_names::push_debuginfo_type_name
  16:     0x731b9579cde5 - rustc_codegen_ssa[6619af2d2b318611]::debuginfo::type_names::push_generic_params
  17:     0x731b9192005b - <rustc_codegen_llvm[36125070fdede679]::context::CodegenCx as rustc_codegen_ssa[6619af2d2b318611]::traits::debuginfo::DebugInfoMethods>::dbg_scope_fn
  18:     0x731b95edcf7c - rustc_codegen_ssa[6619af2d2b318611]::mir::codegen_mir::<rustc_codegen_llvm[36125070fdede679]::builder::Builder>
  19:     0x731b95edacb5 - rustc_codegen_llvm[36125070fdede679]::base::compile_codegen_unit::module_codegen
  20:     0x731b95f874d3 - <rustc_codegen_llvm[36125070fdede679]::LlvmCodegenBackend as rustc_codegen_ssa[6619af2d2b318611]::traits::backend::ExtraBackendMethods>::compile_codegen_unit
  21:     0x731b95f83ec4 - <rustc_codegen_llvm[36125070fdede679]::LlvmCodegenBackend as rustc_codegen_ssa[6619af2d2b318611]::traits::backend::CodegenBackend>::codegen_crate
  22:     0x731b9617c070 - <rustc_interface[7fb29fbff936f0be]::queries::Linker>::codegen_and_build_linker
  23:     0x731b95dc0a97 - rustc_interface[7fb29fbff936f0be]::interface::run_compiler::<core[d1ee7ab0152fc8ae]::result::Result<(), rustc_span[b2ae2de433ea6577]::ErrorGuaranteed>, rustc_driver_impl[bb501fee5761e404]::run_compiler::{closure#0}>::{closure#1}
  24:     0x731b95e509d0 - std[1420b3a934c096b7]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[7fb29fbff936f0be]::util::run_in_thread_with_globals<rustc_interface[7fb29fbff936f0be]::util::run_in_thread_pool_with_globals<rustc_interface[7fb29fbff936f0be]::interface::run_compiler<core[d1ee7ab0152fc8ae]::result::Result<(), rustc_span[b2ae2de433ea6577]::ErrorGuaranteed>, rustc_driver_impl[bb501fee5761e404]::run_compiler::{closure#0}>::{closure#1}, core[d1ee7ab0152fc8ae]::result::Result<(), rustc_span[b2ae2de433ea6577]::ErrorGuaranteed>>::{closure#0}, core[d1ee7ab0152fc8ae]::result::Result<(), rustc_span[b2ae2de433ea6577]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[d1ee7ab0152fc8ae]::result::Result<(), rustc_span[b2ae2de433ea6577]::ErrorGuaranteed>>
  25:     0x731b95e5103a - <<std[1420b3a934c096b7]::thread::Builder>::spawn_unchecked_<rustc_interface[7fb29fbff936f0be]::util::run_in_thread_with_globals<rustc_interface[7fb29fbff936f0be]::util::run_in_thread_pool_with_globals<rustc_interface[7fb29fbff936f0be]::interface::run_compiler<core[d1ee7ab0152fc8ae]::result::Result<(), rustc_span[b2ae2de433ea6577]::ErrorGuaranteed>, rustc_driver_impl[bb501fee5761e404]::run_compiler::{closure#0}>::{closure#1}, core[d1ee7ab0152fc8ae]::result::Result<(), rustc_span[b2ae2de433ea6577]::ErrorGuaranteed>>::{closure#0}, core[d1ee7ab0152fc8ae]::result::Result<(), rustc_span[b2ae2de433ea6577]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[d1ee7ab0152fc8ae]::result::Result<(), rustc_span[b2ae2de433ea6577]::ErrorGuaranteed>>::{closure#1} as core[d1ee7ab0152fc8ae]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  26:     0x731b95e513ab - std::sys::pal::unix::thread::Thread::new::thread_start::h2097b27b23ed513c
  27:     0x731b9761439d - <unknown>
  28:     0x731b9769949c - <unknown>
  29:                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/rust/rustc-ice-2024-08-28T19_34_10-1810605.txt` to your bug report

note: compiler flags: -C debuginfo=2

query stack during panic:
end of query stack
error: aborting due to 1 previous error