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ICE: open drop from non-ADT  #140930

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#140967
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ICE: open drop from non-ADT #140930
#140967
Labels
-Zvalidate-mirUnstable option: MIR validationC-bugCategory: This is a bug.E-needs-mcveCall for participation: This issue has a repro, but needs a Minimal Complete and Verifiable ExampleF-async_drop`#![feature(async_drop)]`I-ICEIssue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️S-has-bisectionStatus: A bisection has been found for this issueT-compilerRelevant to the compiler team, which will review and decide on the PR/issue.requires-incomplete-featuresThis issue requires the use of incomplete features.
@matthiaskrgr

Description

@matthiaskrgr
matthiaskrgr
opened on May 12, 2025
Member

snippet:

//@compile-flags: -Zvalidate-mir -Zinline-mir=yes
use std::mem::ManuallyDrop;
use std::{
    future::{async_drop_in_place, Future},
    pin::{pin, Pin},
};
fn a() {
    b(bar(0))
}
async fn bar(c: usize);
fn b<d>(e: d) {
    let mut f = pin!(ManuallyDrop::new(e));
    let mut fut = { Pin::map_unchecked_mut(f, |g| &mut **g) };
    let mut context;
    let h = async_drop_in_place(fut.get_unchecked_mut());
    let mut i = pin!(h);
    match i.poll( context) {
                      j }
}

Version information

rustc 1.89.0-nightly (718ddf660 2025-05-12)
binary: rustc
commit-hash: 718ddf660e6a1802c39b4962cf7eaa4db57025ef
commit-date: 2025-05-12
host: x86_64-unknown-linux-gnu
release: 1.89.0-nightly
LLVM version: 20.1.4

Possibly related line of code:

rust/compiler/rustc_mir_transform/src/elaborate_drop.rs

Lines 1248 to 1260 in 718ddf6

ty::Array(ety, size) => {
let size = size.try_to_target_usize(self.tcx());
self.open_drop_for_array(ty, *ety, size)
}
ty::Slice(ety) => self.drop_loop_trio_for_slice(*ety),
_ => span_bug!(self.source_info.span, "open drop from non-ADT `{:?}`", ty),
}
}
fn complete_drop(&mut self, succ: BasicBlock, unwind: Unwind) -> BasicBlock {
debug!("complete_drop(succ={:?}, unwind={:?})", succ, unwind);

Command:
/home/matthias/.rustup/toolchains/master/bin/rustc -Zvalidate-mir -Zinline-mir=yes

Program output 

error[E0670]: `async fn` is not permitted in Rust 2015
 --> /tmp/icemaker_global_tempdir.tcPGNTRpBJ9s/rustc_testrunner_tmpdir_reporting.XOmIYrPbp6kH/mvce.rs:9:1
  |
9 | async fn bar(c: usize);
  | ^^^^^ to use `async fn`, switch to Rust 2018 or later
  |
  = help: pass `--edition 2024` to `rustc`
  = note: for more on editions, read https://doc.rust-lang.org/edition-guide

error: free function without a body
 --> /tmp/icemaker_global_tempdir.tcPGNTRpBJ9s/rustc_testrunner_tmpdir_reporting.XOmIYrPbp6kH/mvce.rs:9:1
  |
9 | async fn bar(c: usize);
  | ^^^^^^^^^^^^^^^^^^^^^^-
  |                       |
  |                       help: provide a definition for the function: `{ <body> }`

error: `match` arm with no body
  --> /tmp/icemaker_global_tempdir.tcPGNTRpBJ9s/rustc_testrunner_tmpdir_reporting.XOmIYrPbp6kH/mvce.rs:17:23
   |
17 |                       j }
   |                       ^
   |
help: add a body after the pattern
   |
17 |                       j => { todo!() } }
   |                         ++++++++++++++

warning: type parameter `d` should have an upper camel case name
  --> /tmp/icemaker_global_tempdir.tcPGNTRpBJ9s/rustc_testrunner_tmpdir_reporting.XOmIYrPbp6kH/mvce.rs:10:6
   |
10 | fn b<d>(e: d) {
   |      ^ help: convert the identifier to upper camel case: `D`
   |
   = note: `#[warn(non_camel_case_types)]` on by default

error[E0601]: `main` function not found in crate `mvce`
  --> /tmp/icemaker_global_tempdir.tcPGNTRpBJ9s/rustc_testrunner_tmpdir_reporting.XOmIYrPbp6kH/mvce.rs:18:2
   |
18 | }
   |  ^ consider adding a `main` function to `/tmp/icemaker_global_tempdir.tcPGNTRpBJ9s/rustc_testrunner_tmpdir_reporting.XOmIYrPbp6kH/mvce.rs`

error[E0658]: use of unstable library feature `async_drop`
 --> /tmp/icemaker_global_tempdir.tcPGNTRpBJ9s/rustc_testrunner_tmpdir_reporting.XOmIYrPbp6kH/mvce.rs:3:14
  |
3 |     future::{async_drop_in_place, Future},
  |              ^^^^^^^^^^^^^^^^^^^
  |
  = note: see issue #126482 <https://github.com/rust-lang/rust/issues/126482> for more information
  = help: add `#![feature(async_drop)]` to the crate attributes to enable
  = note: this compiler was built on 2025-05-12; consider upgrading it if it is out of date

error[E0658]: use of unstable library feature `async_drop`
  --> /tmp/icemaker_global_tempdir.tcPGNTRpBJ9s/rustc_testrunner_tmpdir_reporting.XOmIYrPbp6kH/mvce.rs:14:13
   |
14 |     let h = async_drop_in_place(fut.get_unchecked_mut());
   |             ^^^^^^^^^^^^^^^^^^^
   |
   = note: see issue #126482 <https://github.com/rust-lang/rust/issues/126482> for more information
   = help: add `#![feature(async_drop)]` to the crate attributes to enable
   = note: this compiler was built on 2025-05-12; consider upgrading it if it is out of date

warning: unused variable: `j`
  --> /tmp/icemaker_global_tempdir.tcPGNTRpBJ9s/rustc_testrunner_tmpdir_reporting.XOmIYrPbp6kH/mvce.rs:17:23
   |
17 |                       j }
   |                       ^ help: if this is intentional, prefix it with an underscore: `_j`
   |
   = note: `#[warn(unused_variables)]` on by default

error[E0133]: call to unsafe function `Pin::<&'a mut T>::map_unchecked_mut` is unsafe and requires unsafe function or block
  --> /tmp/icemaker_global_tempdir.tcPGNTRpBJ9s/rustc_testrunner_tmpdir_reporting.XOmIYrPbp6kH/mvce.rs:12:21
   |
12 |     let mut fut = { Pin::map_unchecked_mut(f, |g| &mut **g) };
   |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ call to unsafe function
   |
   = note: consult the function's documentation for information on how to avoid undefined behavior

error[E0133]: call to unsafe function `async_drop_in_place` is unsafe and requires unsafe function or block
  --> /tmp/icemaker_global_tempdir.tcPGNTRpBJ9s/rustc_testrunner_tmpdir_reporting.XOmIYrPbp6kH/mvce.rs:14:13
   |
14 |     let h = async_drop_in_place(fut.get_unchecked_mut());
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ call to unsafe function
   |
   = note: consult the function's documentation for information on how to avoid undefined behavior

error[E0133]: call to unsafe function `Pin::<&'a mut T>::get_unchecked_mut` is unsafe and requires unsafe function or block
  --> /tmp/icemaker_global_tempdir.tcPGNTRpBJ9s/rustc_testrunner_tmpdir_reporting.XOmIYrPbp6kH/mvce.rs:14:33
   |
14 |     let h = async_drop_in_place(fut.get_unchecked_mut());
   |                                 ^^^^^^^^^^^^^^^^^^^^^^^ call to unsafe function
   |
   = note: consult the function's documentation for information on how to avoid undefined behavior

warning: variable does not need to be mutable
  --> /tmp/icemaker_global_tempdir.tcPGNTRpBJ9s/rustc_testrunner_tmpdir_reporting.XOmIYrPbp6kH/mvce.rs:11:9
   |
11 |     let mut f = pin!(ManuallyDrop::new(e));
   |         ----^
   |         |
   |         help: remove this `mut`
   |
   = note: `#[warn(unused_mut)]` on by default

warning: variable does not need to be mutable
  --> /tmp/icemaker_global_tempdir.tcPGNTRpBJ9s/rustc_testrunner_tmpdir_reporting.XOmIYrPbp6kH/mvce.rs:12:9
   |
12 |     let mut fut = { Pin::map_unchecked_mut(f, |g| &mut **g) };
   |         ----^^^
   |         |
   |         help: remove this `mut`

warning: variable does not need to be mutable
  --> /tmp/icemaker_global_tempdir.tcPGNTRpBJ9s/rustc_testrunner_tmpdir_reporting.XOmIYrPbp6kH/mvce.rs:15:9
   |
15 |     let mut i = pin!(h);
   |         ----^
   |         |
   |         help: remove this `mut`

error[E0381]: used binding `context` isn't initialized
  --> /tmp/icemaker_global_tempdir.tcPGNTRpBJ9s/rustc_testrunner_tmpdir_reporting.XOmIYrPbp6kH/mvce.rs:16:19
   |
13 |     let mut context;
   |         ----------- binding declared here but left uninitialized
...
16 |     match i.poll( context) {
   |                   ^^^^^^^ `context` used here but it isn't initialized
   |
help: consider assigning a value
   |
13 |     let mut context = &mut /* value */;
   |                     ++++++++++++++++++

error: internal compiler error: compiler/rustc_mir_transform/src/elaborate_drop.rs:1254:18: open drop from non-ADT `{type error}`
  --> /home/matthias/.rustup/toolchains/master/lib/rustlib/src/rust/library/core/src/future/async_drop.rs:48:70
   |
48 |   pub async unsafe fn async_drop_in_place<T: ?Sized>(_to_drop: *mut T) {
   |  ______________________________________________________________________^
...  |
51 | | }
   | |_^


thread 'rustc' panicked at compiler/rustc_mir_transform/src/elaborate_drop.rs:1254:18:
Box<dyn Any>
stack backtrace:
   0:     0x78a0ab959fb3 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::hd03fa4624d6a43ff
   1:     0x78a0ac005987 - core::fmt::write::h99c6bd700e41fe5b
   2:     0x78a0ad0b4091 - std::io::Write::write_fmt::h8fdba04fd8ac1437
   3:     0x78a0ab959e12 - std::sys::backtrace::BacktraceLock::print::ha37796b30caa3dee
   4:     0x78a0ab95da0a - std::panicking::default_hook::{{closure}}::h2be5a8e7cd709dcc
   5:     0x78a0ab95d58f - std::panicking::default_hook::h652a4375123f2a56
   6:     0x78a0aa98c873 - std[56b07bdfd6b41829]::panicking::update_hook::<alloc[763664f815bf0fa8]::boxed::Box<rustc_driver_impl[fb64ae308f02562]::install_ice_hook::{closure#1}>>::{closure#0}
   7:     0x78a0ab95e283 - std::panicking::rust_panic_with_hook::h4f131a958fbdba61
   8:     0x78a0aa9c85f1 - std[56b07bdfd6b41829]::panicking::begin_panic::<rustc_errors[b8a92ed9b61c1989]::ExplicitBug>::{closure#0}
   9:     0x78a0aa9bc626 - std[56b07bdfd6b41829]::sys::backtrace::__rust_end_short_backtrace::<std[56b07bdfd6b41829]::panicking::begin_panic<rustc_errors[b8a92ed9b61c1989]::ExplicitBug>::{closure#0}, !>
  10:     0x78a0aa9b8ce9 - std[56b07bdfd6b41829]::panicking::begin_panic::<rustc_errors[b8a92ed9b61c1989]::ExplicitBug>
  11:     0x78a0aa9d2c71 - <rustc_errors[b8a92ed9b61c1989]::diagnostic::BugAbort as rustc_errors[b8a92ed9b61c1989]::diagnostic::EmissionGuarantee>::emit_producing_guarantee
  12:     0x78a0aafa0adc - <rustc_errors[b8a92ed9b61c1989]::DiagCtxtHandle>::span_bug::<rustc_span[d026ac1b2b8daa7c]::span_encoding::Span, alloc[763664f815bf0fa8]::string::String>
  13:     0x78a0ab03ecb7 - rustc_middle[60b471758888797e]::util::bug::opt_span_bug_fmt::<rustc_span[d026ac1b2b8daa7c]::span_encoding::Span>::{closure#0}
  14:     0x78a0ab01723a - rustc_middle[60b471758888797e]::ty::context::tls::with_opt::<rustc_middle[60b471758888797e]::util::bug::opt_span_bug_fmt<rustc_span[d026ac1b2b8daa7c]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  15:     0x78a0ab0170ab - rustc_middle[60b471758888797e]::ty::context::tls::with_context_opt::<rustc_middle[60b471758888797e]::ty::context::tls::with_opt<rustc_middle[60b471758888797e]::util::bug::opt_span_bug_fmt<rustc_span[d026ac1b2b8daa7c]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  16:     0x78a0a93f14c7 - rustc_middle[60b471758888797e]::util::bug::span_bug_fmt::<rustc_span[d026ac1b2b8daa7c]::span_encoding::Span>
  17:     0x78a0ac897c24 - <rustc_mir_transform[4a4e9cf23a9606fd]::elaborate_drop::DropCtxt<rustc_mir_transform[4a4e9cf23a9606fd]::shim::DropShimElaborator>>::elaborate_drop
  18:     0x78a0ac891851 - rustc_mir_transform[4a4e9cf23a9606fd]::shim::make_shim
  19:     0x78a0ac88f82f - rustc_query_impl[cf6f12f07b5d9141]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[cf6f12f07b5d9141]::query_impl::mir_shims::dynamic_query::{closure#2}::{closure#0}, rustc_middle[60b471758888797e]::query::erase::Erased<[u8; 8usize]>>
  20:     0x78a0ac88f7e3 - <rustc_query_impl[cf6f12f07b5d9141]::query_impl::mir_shims::dynamic_query::{closure#2} as core[604f71d46da0bdba]::ops::function::FnOnce<(rustc_middle[60b471758888797e]::ty::context::TyCtxt, rustc_middle[60b471758888797e]::ty::instance::InstanceKind)>>::call_once
  21:     0x78a0ac852d8c - rustc_query_system[620f1d082c8e701b]::query::plumbing::try_execute_query::<rustc_query_impl[cf6f12f07b5d9141]::DynamicConfig<rustc_query_system[620f1d082c8e701b]::query::caches::DefaultCache<rustc_middle[60b471758888797e]::ty::instance::InstanceKind, rustc_middle[60b471758888797e]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[cf6f12f07b5d9141]::plumbing::QueryCtxt, false>
  22:     0x78a0ac852aaa - rustc_query_impl[cf6f12f07b5d9141]::query_impl::mir_shims::get_query_non_incr::__rust_end_short_backtrace
  23:     0x78a0ac84d95e - <rustc_middle[60b471758888797e]::ty::context::TyCtxt>::instance_mir
  24:     0x78a0aca7a70f - rustc_mir_transform[4a4e9cf23a9606fd]::inline::cycle::mir_inliner_callees
  25:     0x78a0aca7a574 - rustc_query_impl[cf6f12f07b5d9141]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[cf6f12f07b5d9141]::query_impl::mir_inliner_callees::dynamic_query::{closure#2}::{closure#0}, rustc_middle[60b471758888797e]::query::erase::Erased<[u8; 16usize]>>
  26:     0x78a0aca7a543 - <rustc_query_impl[cf6f12f07b5d9141]::query_impl::mir_inliner_callees::dynamic_query::{closure#2} as core[604f71d46da0bdba]::ops::function::FnOnce<(rustc_middle[60b471758888797e]::ty::context::TyCtxt, rustc_middle[60b471758888797e]::ty::instance::InstanceKind)>>::call_once
  27:     0x78a0ac853a47 - rustc_query_system[620f1d082c8e701b]::query::plumbing::try_execute_query::<rustc_query_impl[cf6f12f07b5d9141]::DynamicConfig<rustc_query_system[620f1d082c8e701b]::query::caches::DefaultCache<rustc_middle[60b471758888797e]::ty::instance::InstanceKind, rustc_middle[60b471758888797e]::query::erase::Erased<[u8; 16usize]>>, false, false, false>, rustc_query_impl[cf6f12f07b5d9141]::plumbing::QueryCtxt, false>
  28:     0x78a0ac85373b - rustc_query_impl[cf6f12f07b5d9141]::query_impl::mir_inliner_callees::get_query_non_incr::__rust_end_short_backtrace
  29:     0x78a0acff4d76 - rustc_mir_transform[4a4e9cf23a9606fd]::inline::cycle::mir_callgraph_reachable::process
  30:     0x78a0acff519f - rustc_mir_transform[4a4e9cf23a9606fd]::inline::cycle::mir_callgraph_reachable::process
  31:     0x78a0acff4544 - rustc_mir_transform[4a4e9cf23a9606fd]::inline::cycle::mir_callgraph_reachable
  32:     0x78a0acff4369 - rustc_query_impl[cf6f12f07b5d9141]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[cf6f12f07b5d9141]::query_impl::mir_callgraph_reachable::dynamic_query::{closure#2}::{closure#0}, rustc_middle[60b471758888797e]::query::erase::Erased<[u8; 1usize]>>
  33:     0x78a0acff4339 - <rustc_query_impl[cf6f12f07b5d9141]::query_impl::mir_callgraph_reachable::dynamic_query::{closure#2} as core[604f71d46da0bdba]::ops::function::FnOnce<(rustc_middle[60b471758888797e]::ty::context::TyCtxt, (rustc_middle[60b471758888797e]::ty::instance::Instance, rustc_span[d026ac1b2b8daa7c]::def_id::LocalDefId))>>::call_once
  34:     0x78a0ac851dac - rustc_query_system[620f1d082c8e701b]::query::plumbing::try_execute_query::<rustc_query_impl[cf6f12f07b5d9141]::DynamicConfig<rustc_query_system[620f1d082c8e701b]::query::caches::DefaultCache<(rustc_middle[60b471758888797e]::ty::instance::Instance, rustc_span[d026ac1b2b8daa7c]::def_id::LocalDefId), rustc_middle[60b471758888797e]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[cf6f12f07b5d9141]::plumbing::QueryCtxt, false>
  35:     0x78a0ac851aa8 - rustc_query_impl[cf6f12f07b5d9141]::query_impl::mir_callgraph_reachable::get_query_non_incr::__rust_end_short_backtrace
  36:     0x78a0ac8a2a7b - rustc_mir_transform[4a4e9cf23a9606fd]::inline::process_blocks::<rustc_mir_transform[4a4e9cf23a9606fd]::inline::NormalInliner>
  37:     0x78a0ac8cd31a - <rustc_mir_transform[4a4e9cf23a9606fd]::inline::Inline as rustc_mir_transform[4a4e9cf23a9606fd]::pass_manager::MirPass>::run_pass
  38:     0x78a0ac00383d - rustc_mir_transform[4a4e9cf23a9606fd]::pass_manager::run_passes_inner
  39:     0x78a0aca7da03 - rustc_mir_transform[4a4e9cf23a9606fd]::run_optimization_passes
  40:     0x78a0aca7b2fb - rustc_mir_transform[4a4e9cf23a9606fd]::optimized_mir
  41:     0x78a0aca7ae9d - rustc_query_impl[cf6f12f07b5d9141]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[cf6f12f07b5d9141]::query_impl::optimized_mir::dynamic_query::{closure#2}::{closure#0}, rustc_middle[60b471758888797e]::query::erase::Erased<[u8; 8usize]>>
  42:     0x78a0ac450e3f - rustc_query_system[620f1d082c8e701b]::query::plumbing::try_execute_query::<rustc_query_impl[cf6f12f07b5d9141]::DynamicConfig<rustc_query_system[620f1d082c8e701b]::query::caches::DefIdCache<rustc_middle[60b471758888797e]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[cf6f12f07b5d9141]::plumbing::QueryCtxt, false>
  43:     0x78a0ac450262 - rustc_query_impl[cf6f12f07b5d9141]::query_impl::optimized_mir::get_query_non_incr::__rust_end_short_backtrace
  44:     0x78a0ac84d286 - <rustc_middle[60b471758888797e]::ty::context::TyCtxt>::instance_mir
  45:     0x78a0ac4b585f - rustc_interface[52ab4bdc9c3114ed]::passes::run_required_analyses
  46:     0x78a0acfbb49e - rustc_interface[52ab4bdc9c3114ed]::passes::analysis
  47:     0x78a0acfbb475 - rustc_query_impl[cf6f12f07b5d9141]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[cf6f12f07b5d9141]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[60b471758888797e]::query::erase::Erased<[u8; 0usize]>>
  48:     0x78a0acf2cdba - rustc_query_system[620f1d082c8e701b]::query::plumbing::try_execute_query::<rustc_query_impl[cf6f12f07b5d9141]::DynamicConfig<rustc_query_system[620f1d082c8e701b]::query::caches::SingleCache<rustc_middle[60b471758888797e]::query::erase::Erased<[u8; 0usize]>>, false, false, false>, rustc_query_impl[cf6f12f07b5d9141]::plumbing::QueryCtxt, false>
  49:     0x78a0acf2ca8f - rustc_query_impl[cf6f12f07b5d9141]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  50:     0x78a0ad1fdc07 - rustc_interface[52ab4bdc9c3114ed]::passes::create_and_enter_global_ctxt::<core[604f71d46da0bdba]::option::Option<rustc_interface[52ab4bdc9c3114ed]::queries::Linker>, rustc_driver_impl[fb64ae308f02562]::run_compiler::{closure#0}::{closure#2}>::{closure#2}::{closure#0}
  51:     0x78a0ad0f9fe6 - rustc_interface[52ab4bdc9c3114ed]::interface::run_compiler::<(), rustc_driver_impl[fb64ae308f02562]::run_compiler::{closure#0}>::{closure#1}
  52:     0x78a0ad0aacfe - std[56b07bdfd6b41829]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[52ab4bdc9c3114ed]::util::run_in_thread_with_globals<rustc_interface[52ab4bdc9c3114ed]::util::run_in_thread_pool_with_globals<rustc_interface[52ab4bdc9c3114ed]::interface::run_compiler<(), rustc_driver_impl[fb64ae308f02562]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
  53:     0x78a0ad0ab16b - <<std[56b07bdfd6b41829]::thread::Builder>::spawn_unchecked_<rustc_interface[52ab4bdc9c3114ed]::util::run_in_thread_with_globals<rustc_interface[52ab4bdc9c3114ed]::util::run_in_thread_pool_with_globals<rustc_interface[52ab4bdc9c3114ed]::interface::run_compiler<(), rustc_driver_impl[fb64ae308f02562]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core[604f71d46da0bdba]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  54:     0x78a0ad0ac56b - std::sys::pal::unix::thread::Thread::new::thread_start::he52776061f67c85f
  55:     0x78a0a6ea370a - <unknown>
  56:     0x78a0a6f27aac - <unknown>
  57:                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: rustc 1.89.0-nightly (718ddf660 2025-05-12) running on x86_64-unknown-linux-gnu

note: compiler flags: -Z validate-mir -Z inline-mir=yes -Z dump-mir-dir=dir

query stack during panic:
#0 [mir_shims] generating MIR shim for `core::future::async_drop::async_drop_in_place::{closure#0}`, instance=AsyncDropGlue(DefId(2:15267 ~ core[604f]::future::async_drop::async_drop_in_place::{closure#0}), Coroutine(DefId(2:15267 ~ core[604f]::future::async_drop::async_drop_in_place::{closure#0}), [{type error}, (), core::future::ResumeTy, (), (), CoroutineWitness(DefId(2:15267 ~ core[604f]::future::async_drop::async_drop_in_place::{closure#0}), [{type error}]), (*mut {type error},)]))
#1 [mir_inliner_callees] computing all local function calls in `core::future::async_drop::async_drop_in_place::{closure#0}`
#2 [mir_callgraph_reachable] computing if `b::<{type error}>` (transitively) calls `a`
#3 [optimized_mir] optimizing MIR for `a`
#4 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 11 previous errors; 5 warnings emitted

Some errors have detailed explanations: E0133, E0381, E0601, E0658, E0670.
For more information about an error, try `rustc --explain E0133`.

Activity

matthiaskrgr
added
I-ICEIssue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️
T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.
C-bugCategory: This is a bug.
on May 12, 2025
rustbot
added
needs-triageThis issue may need triage. Remove it if it has been sufficiently triaged.
on May 12, 2025
moxian

moxian commented on May 12, 2025

@moxian
moxian
on May 12, 2025 · edited by moxian
Contributor

bisects to #123948
the example in OP looks rather noisy, with extra errors that don't need to be there. Would be nice to minimize and cleanup a bit further.

@rustbot label: +F-async_drop +-Zvalidate-mir +E-needs-mcve +S-has-bisection +requires-incomplete-features -needs-triage

rustbot

rustbot commented on May 12, 2025

@rustbot
rustbot
on May 12, 2025
Collaborator

Unknown labels: F-async-drop, -Z-validate-mir

rustbot
added
-Zvalidate-mirUnstable option: MIR validation
E-needs-mcveCall for participation: This issue has a repro, but needs a Minimal Complete and Verifiable Example
F-async_drop`#![feature(async_drop)]`
requires-incomplete-featuresThis issue requires the use of incomplete features.
S-has-bisectionStatus: A bisection has been found for this issue
and removed
needs-triageThis issue may need triage. Remove it if it has been sufficiently triaged.
on May 12, 2025
theemathas

theemathas commented on May 12, 2025

@theemathas
theemathas
on May 12, 2025
Contributor

Minimized:

//@compile-flags: -Zvalidate-mir -Zinline-mir=yes --crate-type=lib

#![feature(async_drop)]

use std::{
    future::{Future, async_drop_in_place},
    pin::pin,
    task::Context,
};

fn wrong() -> impl Sized {
    *"abc" // Doesn't implement Sized
}
fn weird(context: &mut Context<'_>) {
    let mut e = wrong();
    let h = unsafe { async_drop_in_place(&raw mut e) };
    let i = pin!(h);
    i.poll(context);
}
Error output 
warning: the feature `async_drop` is incomplete and may not be safe to use and/or cause compiler crashes
 --> src/lib.rs:3:12
  |
3 | #![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

error[E0277]: the size for values of type `str` cannot be known at compilation time
  --> src/lib.rs:11:15
   |
11 | fn wrong() -> impl Sized {
   |               ^^^^^^^^^^ doesn't have a size known at compile-time
12 |     *"abc" // Doesn't implement Sized
   |     ------ return type was inferred to be `str` here
   |
   = help: the trait `Sized` is not implemented for `str`
help: references are always `Sized`, even if they point to unsized data; consider not dereferencing the expression
   |
12 -     *"abc" // Doesn't implement Sized
12 +     "abc" // Doesn't implement Sized
   |

error: internal compiler error: compiler/rustc_mir_transform/src/elaborate_drop.rs:1254:18: open drop from non-ADT `{type error}`
  --> /Users/timch/.rustup/toolchains/nightly-aarch64-apple-darwin/lib/rustlib/src/rust/library/core/src/future/async_drop.rs:48:70
   |
48 |   pub async unsafe fn async_drop_in_place<T: ?Sized>(_to_drop: *mut T) {
   |  ______________________________________________________________________^
...  |
51 | | }
   | |_^


thread 'rustc' panicked at compiler/rustc_mir_transform/src/elaborate_drop.rs:1254:18:
Box<dyn Any>
stack backtrace:
   0:        0x1103ca290 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::h8538a0cbd0a29488
   1:        0x10d9b91e8 - core::fmt::write::hc868a20baa39afeb
   2:        0x1103bebc4 - std::io::Write::write_fmt::h3d4b5fdc963d14ff
   3:        0x1103ca150 - std::sys::backtrace::BacktraceLock::print::h93cc182a120c41ba
   4:        0x1103cee0c - std::panicking::default_hook::{{closure}}::hb672fcbc7dc2d6ae
   5:        0x1103ceadc - std::panicking::default_hook::h2c53d6eae91798f2
   6:        0x10e527db8 - std[37ce58b9063475e]::panicking::update_hook::<alloc[b1849f567b850016]::boxed::Box<rustc_driver_impl[f8d7c4f8b6e94698]::install_ice_hook::{closure#1}>>::{closure#0}
   7:        0x1103cf7f4 - std::panicking::rust_panic_with_hook::hc7af3aa4fdc12c97
   8:        0x10e5aacd4 - std[37ce58b9063475e]::panicking::begin_panic::<rustc_errors[e3d83480659768f1]::ExplicitBug>::{closure#0}
   9:        0x10e598e80 - std[37ce58b9063475e]::sys::backtrace::__rust_end_short_backtrace::<std[37ce58b9063475e]::panicking::begin_panic<rustc_errors[e3d83480659768f1]::ExplicitBug>::{closure#0}, !>
  10:        0x1130651ac - std[37ce58b9063475e]::panicking::begin_panic::<rustc_errors[e3d83480659768f1]::ExplicitBug>
  11:        0x113065584 - <rustc_errors[e3d83480659768f1]::diagnostic::BugAbort as rustc_errors[e3d83480659768f1]::diagnostic::EmissionGuarantee>::emit_producing_guarantee
  12:        0x1130d5f98 - <rustc_errors[e3d83480659768f1]::DiagCtxtHandle>::span_bug::<rustc_span[594e537fab3ea3f]::span_encoding::Span, alloc[b1849f567b850016]::string::String>
  13:        0x1130dee1c - rustc_middle[e7ee0c50ed9ed64b]::util::bug::opt_span_bug_fmt::<rustc_span[594e537fab3ea3f]::span_encoding::Span>::{closure#0}
  14:        0x10f19eb24 - rustc_middle[e7ee0c50ed9ed64b]::ty::context::tls::with_opt::<rustc_middle[e7ee0c50ed9ed64b]::util::bug::opt_span_bug_fmt<rustc_span[594e537fab3ea3f]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  15:        0x10f19e5f4 - rustc_middle[e7ee0c50ed9ed64b]::ty::context::tls::with_context_opt::<rustc_middle[e7ee0c50ed9ed64b]::ty::context::tls::with_opt<rustc_middle[e7ee0c50ed9ed64b]::util::bug::opt_span_bug_fmt<rustc_span[594e537fab3ea3f]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  16:        0x1130ded8c - rustc_middle[e7ee0c50ed9ed64b]::util::bug::span_bug_fmt::<rustc_span[594e537fab3ea3f]::span_encoding::Span>
  17:        0x10f4a12d0 - <rustc_mir_transform[1f3f7b4c1c2588bc]::elaborate_drop::DropCtxt<rustc_mir_transform[1f3f7b4c1c2588bc]::shim::DropShimElaborator>>::elaborate_drop
  18:        0x10f493e80 - rustc_mir_transform[1f3f7b4c1c2588bc]::shim::make_shim
  19:        0x10fb273ac - rustc_query_impl[450b0d7dafedda2d]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[450b0d7dafedda2d]::query_impl::mir_shims::dynamic_query::{closure#2}::{closure#0}, rustc_middle[e7ee0c50ed9ed64b]::query::erase::Erased<[u8; 8usize]>>
  20:        0x10fafbba0 - <rustc_query_impl[450b0d7dafedda2d]::query_impl::mir_shims::dynamic_query::{closure#2} as core[8358e3f6e6ac61e1]::ops::function::FnOnce<(rustc_middle[e7ee0c50ed9ed64b]::ty::context::TyCtxt, rustc_middle[e7ee0c50ed9ed64b]::ty::instance::InstanceKind)>>::call_once
  21:        0x10f942cac - rustc_query_system[f04a75388b1923fa]::query::plumbing::try_execute_query::<rustc_query_impl[450b0d7dafedda2d]::DynamicConfig<rustc_query_system[f04a75388b1923fa]::query::caches::DefaultCache<rustc_middle[e7ee0c50ed9ed64b]::ty::instance::InstanceKind, rustc_middle[e7ee0c50ed9ed64b]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[450b0d7dafedda2d]::plumbing::QueryCtxt, false>
  22:        0x10fb63ca4 - rustc_query_impl[450b0d7dafedda2d]::query_impl::mir_shims::get_query_non_incr::__rust_end_short_backtrace
  23:        0x10f223a10 - <rustc_middle[e7ee0c50ed9ed64b]::ty::context::TyCtxt>::instance_mir
  24:        0x10f544750 - rustc_mir_transform[1f3f7b4c1c2588bc]::inline::try_instance_mir
  25:        0x10f4f65f4 - rustc_mir_transform[1f3f7b4c1c2588bc]::inline::process_blocks::<rustc_mir_transform[1f3f7b4c1c2588bc]::inline::NormalInliner>
  26:        0x10f4f234c - <rustc_mir_transform[1f3f7b4c1c2588bc]::inline::Inline as rustc_mir_transform[1f3f7b4c1c2588bc]::pass_manager::MirPass>::run_pass
  27:        0x10f4795e0 - rustc_mir_transform[1f3f7b4c1c2588bc]::pass_manager::run_passes_inner
  28:        0x10f49e5cc - rustc_mir_transform[1f3f7b4c1c2588bc]::run_optimization_passes
  29:        0x10f49ea4c - rustc_mir_transform[1f3f7b4c1c2588bc]::optimized_mir
  30:        0x10fb2195c - rustc_query_impl[450b0d7dafedda2d]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[450b0d7dafedda2d]::query_impl::optimized_mir::dynamic_query::{closure#2}::{closure#0}, rustc_middle[e7ee0c50ed9ed64b]::query::erase::Erased<[u8; 8usize]>>
  31:        0x10f8f4334 - rustc_query_system[f04a75388b1923fa]::query::plumbing::try_execute_query::<rustc_query_impl[450b0d7dafedda2d]::DynamicConfig<rustc_query_system[f04a75388b1923fa]::query::caches::DefIdCache<rustc_middle[e7ee0c50ed9ed64b]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[450b0d7dafedda2d]::plumbing::QueryCtxt, false>
  32:        0x10fb3eb98 - rustc_query_impl[450b0d7dafedda2d]::query_impl::optimized_mir::get_query_non_incr::__rust_end_short_backtrace
  33:        0x10f223c3c - <rustc_middle[e7ee0c50ed9ed64b]::ty::context::TyCtxt>::instance_mir
  34:        0x10ee0f884 - rustc_interface[70e180df94007202]::passes::run_required_analyses
  35:        0x10ee112e8 - rustc_interface[70e180df94007202]::passes::analysis
  36:        0x10fb26fd4 - rustc_query_impl[450b0d7dafedda2d]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[450b0d7dafedda2d]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[e7ee0c50ed9ed64b]::query::erase::Erased<[u8; 0usize]>>
  37:        0x10f8f7fe8 - rustc_query_system[f04a75388b1923fa]::query::plumbing::try_execute_query::<rustc_query_impl[450b0d7dafedda2d]::DynamicConfig<rustc_query_system[f04a75388b1923fa]::query::caches::SingleCache<rustc_middle[e7ee0c50ed9ed64b]::query::erase::Erased<[u8; 0usize]>>, false, false, false>, rustc_query_impl[450b0d7dafedda2d]::plumbing::QueryCtxt, false>
  38:        0x10fb33258 - rustc_query_impl[450b0d7dafedda2d]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  39:        0x10e4d8dfc - rustc_interface[70e180df94007202]::passes::create_and_enter_global_ctxt::<core[8358e3f6e6ac61e1]::option::Option<rustc_interface[70e180df94007202]::queries::Linker>, rustc_driver_impl[f8d7c4f8b6e94698]::run_compiler::{closure#0}::{closure#2}>
  40:        0x10e524bb8 - rustc_interface[70e180df94007202]::interface::run_compiler::<(), rustc_driver_impl[f8d7c4f8b6e94698]::run_compiler::{closure#0}>::{closure#1}
  41:        0x10e515b10 - std[37ce58b9063475e]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[70e180df94007202]::util::run_in_thread_with_globals<rustc_interface[70e180df94007202]::util::run_in_thread_pool_with_globals<rustc_interface[70e180df94007202]::interface::run_compiler<(), rustc_driver_impl[f8d7c4f8b6e94698]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
  42:        0x10e52b574 - <<std[37ce58b9063475e]::thread::Builder>::spawn_unchecked_<rustc_interface[70e180df94007202]::util::run_in_thread_with_globals<rustc_interface[70e180df94007202]::util::run_in_thread_pool_with_globals<rustc_interface[70e180df94007202]::interface::run_compiler<(), rustc_driver_impl[f8d7c4f8b6e94698]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core[8358e3f6e6ac61e1]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  43:        0x1103d1d38 - std::sys::pal::unix::thread::Thread::new::thread_start::h1a4d34a906f31054
  44:        0x190301c0c - __pthread_cond_wait

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 `/Users/timch/foo/rustc-ice-2025-05-12T07_30_26-11777.txt` to your bug report

note: compiler flags: -Z validate-mir -Z inline-mir=yes --crate-type lib

query stack during panic:
#0 [mir_shims] generating MIR shim for `core::future::async_drop::async_drop_in_place::{closure#0}`, instance=AsyncDropGlue(DefId(2:15263 ~ core[8358]::future::async_drop::async_drop_in_place::{closure#0}), Coroutine(DefId(2:15263 ~ core[8358]::future::async_drop::async_drop_in_place::{closure#0}), [{type error}, (), core::future::ResumeTy, (), (), CoroutineWitness(DefId(2:15263 ~ core[8358]::future::async_drop::async_drop_in_place::{closure#0}), [{type error}]), (*mut {type error},)]))
#1 [optimized_mir] optimizing MIR for `weird`
#2 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 2 previous errors; 1 warning emitted

For more information about this error, try `rustc --explain E0277`.
azhogin
added a commit that references this issue on May 13, 2025

Async drop poll shim for error dropee generates noop body (fixes rust…

41d3a86
azhogin
mentioned this on May 13, 2025
azhogin

azhogin commented on May 13, 2025

@azhogin
azhogin
on May 13, 2025
Contributor

Fix: #140967

cushionbadak
mentioned this on May 22, 2025
azhogin
added a commit that references this issue on May 22, 2025

Async drop poll shim for error dropee generates noop body (fixes rust…

cb8fdb4
matthiaskrgr
added 2 commits that reference this issue on May 23, 2025

Rollup merge of rust-lang#140967 - azhogin:azhogin/async-drop-poll-sh…

76a086e

Rollup merge of rust-lang#140967 - azhogin:azhogin/async-drop-poll-sh…

f7a1179
bors
closed this as completedin cb8fdb4on May 23, 2025
github-actions
added a commit that references this issue on May 25, 2025

Rollup merge of #140967 - azhogin:azhogin/async-drop-poll-shim-for-er…

502c7c0
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    -Zvalidate-mirUnstable option: MIR validationC-bugCategory: This is a bug.E-needs-mcveCall for participation: This issue has a repro, but needs a Minimal Complete and Verifiable ExampleF-async_drop`#![feature(async_drop)]`I-ICEIssue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️S-has-bisectionStatus: A bisection has been found for this issueT-compilerRelevant to the compiler team, which will review and decide on the PR/issue.requires-incomplete-featuresThis issue requires the use of incomplete features.

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      Issue actions
        ICE: `open drop from non-ADT ` · Issue #140930 · rust-lang/rust