ice: `coroutine constructed with incorrect number of substitutions`

[matthiaskrgr]

auto-reduced (treereduce-rust):

#![feature(coroutines, coroutine_trait)]

use std::ops::Coroutine;
use std::pin::Pin;
use std::thread;

fn send_over_threads() {
    let mut foo = || yield;
    thread::spawn(move || match Pin::new(&mut foo).resume(()) {
        s => panic!("bad state: {:?}", s),
    })
    .join()
    .unwrap();
}

#[test]
fn send_over_threads() {}

original:

#![feature(coroutines, coroutine_trait)]

use std::ops::{Coroutine, CoroutineState};
use std::pin::Pin;
use std::thread;

fn send_over_threads() {
    let mut foo = || yield;
    thread::spawn(move || match Pin::new(&mut foo).resume(()) {
        s => panic!("bad state: {:?}", s),
    })
    .join()
    .unwrap();
}

#[test]
fn send_over_threads() {}

Version information

rustc 1.78.0-dev
binary: rustc
commit-hash: unknown
commit-date: unknown
host: x86_64-unknown-linux-gnu
release: 1.78.0-dev
LLVM version: 17.0.6

Command:
/home/matthias/.rustup/toolchains/local-debug-assertions/bin/rustc -Zprint-mono-items=eager -Zpolymorphize=on --crate-type=lib

Program output

warning: function `send_over_threads` is never used
 --> /tmp/icemaker_global_tempdir.231TrRoYAvzf/rustc_testrunner_tmpdir_reporting.wyoEqVG7nQrN/mvce.rs:7:4
  |
7 | fn send_over_threads() {
  |    ^^^^^^^^^^^^^^^^^
  |
  = note: `#[warn(dead_code)]` on by default

thread 'rustc' panicked at compiler/rustc_middle/src/ty/sty.rs:1716:9:
assertion `left == right` failed: coroutine constructed with incorrect number of substitutions
  left: 5
 right: 6
stack backtrace:
   0:     0x7f7cb9f7ca5d - std::backtrace_rs::backtrace::libunwind::trace::hb28aaf5f3549701f
                               at /home/matthias/vcs/github/rust_debug_assertions/library/std/src/../../backtrace/src/backtrace/libunwind.rs:104:5
   1:     0x7f7cb9f7ca5d - std::backtrace_rs::backtrace::trace_unsynchronized::he4f17ec88b61fea5
                               at /home/matthias/vcs/github/rust_debug_assertions/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f7cb9f7ca5d - std::sys_common::backtrace::_print_fmt::h5a82a3e85aa2fae5
                               at /home/matthias/vcs/github/rust_debug_assertions/library/std/src/sys_common/backtrace.rs:68:5
   3:     0x7f7cb9f7ca5d - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hb03764486a25b659
                               at /home/matthias/vcs/github/rust_debug_assertions/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f7cb9fc55cf - core::fmt::rt::Argument::fmt::h67bfbe6caf20ecda
                               at /home/matthias/vcs/github/rust_debug_assertions/library/core/src/fmt/rt.rs:142:9
   5:     0x7f7cb9fc55cf - core::fmt::write::h2b3e0bd86bdfc209
                               at /home/matthias/vcs/github/rust_debug_assertions/library/core/src/fmt/mod.rs:1120:17
   6:     0x7f7cb9f64285 - std::io::Write::write_fmt::hcf7284dad3d07738
                               at /home/matthias/vcs/github/rust_debug_assertions/library/std/src/io/mod.rs:1854:15
   7:     0x7f7cb9f7c824 - std::sys_common::backtrace::_print::h1988031c6b9fcf4a
                               at /home/matthias/vcs/github/rust_debug_assertions/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7f7cb9f7c824 - std::sys_common::backtrace::print::h81809c76434159ce
                               at /home/matthias/vcs/github/rust_debug_assertions/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7f7cb9f4022c - std::panicking::default_hook::{{closure}}::he3de9259d121bac5
  10:     0x7f7cb9f3ff00 - std::panicking::default_hook::hcde334a568bf04a2
                               at /home/matthias/vcs/github/rust_debug_assertions/library/std/src/panicking.rs:292:9
  11:     0x7f7cbcaffe47 - rustc_driver_impl[8889ac64fe77a2fe]::install_ice_hook::{closure#0}
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_driver_impl/src/lib.rs:1340:17
  12:     0x7f7cbcaffe47 - <alloc[3b5cf733b6b27210]::boxed::Box<rustc_driver_impl[8889ac64fe77a2fe]::install_ice_hook::{closure#0}> as core[aa444211b5f41879]::ops::function::Fn<(&dyn for<'a, 'b> core[aa444211b5f41879]::ops::function::Fn<(&'a core[aa444211b5f41879]::panic::panic_info::PanicInfo<'b>,), Output = ()> + core[aa444211b5f41879]::marker::Sync + core[aa444211b5f41879]::marker::Send, &core[aa444211b5f41879]::panic::panic_info::PanicInfo)>>::call
                               at /home/matthias/vcs/github/rust_debug_assertions/library/alloc/src/boxed.rs:2029:9
  13:     0x7f7cb9f40ae3 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h65cf345775a09bb6
                               at /home/matthias/vcs/github/rust_debug_assertions/library/alloc/src/boxed.rs:2029:9
  14:     0x7f7cb9f40ae3 - std::panicking::rust_panic_with_hook::hb041b1849b056e6a
                               at /home/matthias/vcs/github/rust_debug_assertions/library/std/src/panicking.rs:785:13
  15:     0x7f7cb9f7cf1a - std::panicking::begin_panic_handler::{{closure}}::hae61001f490e889a
                               at /home/matthias/vcs/github/rust_debug_assertions/library/std/src/panicking.rs:659:13
  16:     0x7f7cb9f7cd26 - std::sys_common::backtrace::__rust_end_short_backtrace::h07aab78c7d5e7b18
                               at /home/matthias/vcs/github/rust_debug_assertions/library/std/src/sys_common/backtrace.rs:171:18
  17:     0x7f7cb9f40654 - rust_begin_unwind
                               at /home/matthias/vcs/github/rust_debug_assertions/library/std/src/panicking.rs:647:5
  18:     0x7f7cb9fdf965 - core::panicking::panic_fmt::h7cdaca6ac7987f65
                               at /home/matthias/vcs/github/rust_debug_assertions/library/core/src/panicking.rs:72:14
  19:     0x7f7cb9fe0019 - core::panicking::assert_failed_inner::heed625da7882381e
                               at /home/matthias/vcs/github/rust_debug_assertions/library/core/src/panicking.rs:337:23
  20:     0x7f7cbde2173f - core[aa444211b5f41879]::panicking::assert_failed::<usize, usize>
                               at /home/matthias/vcs/github/rust_debug_assertions/library/core/src/panicking.rs:297:5
  21:     0x7f7cbdca142a - <rustc_middle[8414b965ec1e8931]::ty::Ty>::new_coroutine
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_middle/src/ty/sty.rs:1716:9
  22:     0x7f7cbdca142a - <rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder as rustc_type_ir[929cb0070a7abace]::fold::TypeFolder<rustc_middle[8414b965ec1e8931]::ty::context::TyCtxt>>::fold_ty
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_middle/src/ty/instance.rs:801:25
  23:     0x7f7cbdc9acbc - <rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder as rustc_type_ir[929cb0070a7abace]::fold::FallibleTypeFolder<rustc_middle[8414b965ec1e8931]::ty::context::TyCtxt>>::try_fold_ty
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_type_ir/src/fold.rs:241:12
  24:     0x7f7cbdc9acbc - <rustc_middle[8414b965ec1e8931]::ty::Ty as rustc_type_ir[929cb0070a7abace]::fold::TypeFoldable<rustc_middle[8414b965ec1e8931]::ty::context::TyCtxt>>::try_fold_with::<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder>
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_middle/src/ty/structural_impls.rs:551:9
  25:     0x7f7cbdc9acbc - rustc_middle[8414b965ec1e8931]::ty::util::fold_list::<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder, rustc_middle[8414b965ec1e8931]::ty::Ty, <&rustc_middle[8414b965ec1e8931]::ty::list::List<rustc_middle[8414b965ec1e8931]::ty::Ty> as rustc_type_ir[929cb0070a7abace]::fold::TypeFoldable<rustc_middle[8414b965ec1e8931]::ty::context::TyCtxt>>::try_fold_with<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder>::{closure#0}>::{closure#0}
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_middle/src/ty/util.rs:1494:61
  26:     0x7f7cbdc9acbc - core[aa444211b5f41879]::iter::traits::iterator::Iterator::find_map::check::<(usize, rustc_middle[8414b965ec1e8931]::ty::Ty), (usize, core[aa444211b5f41879]::result::Result<rustc_middle[8414b965ec1e8931]::ty::Ty, !>), rustc_middle[8414b965ec1e8931]::ty::util::fold_list<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder, rustc_middle[8414b965ec1e8931]::ty::Ty, <&rustc_middle[8414b965ec1e8931]::ty::list::List<rustc_middle[8414b965ec1e8931]::ty::Ty> as rustc_type_ir[929cb0070a7abace]::fold::TypeFoldable<rustc_middle[8414b965ec1e8931]::ty::context::TyCtxt>>::try_fold_with<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder>::{closure#0}>::{closure#0}>::{closure#0}
                               at /home/matthias/vcs/github/rust_debug_assertions/library/core/src/iter/traits/iterator.rs:2958:32
  27:     0x7f7cbdc9acbc - <core[aa444211b5f41879]::iter::adapters::enumerate::Enumerate<_> as core[aa444211b5f41879]::iter::traits::iterator::Iterator>::try_fold::enumerate::<rustc_middle[8414b965ec1e8931]::ty::Ty, (), core[aa444211b5f41879]::ops::control_flow::ControlFlow<(usize, core[aa444211b5f41879]::result::Result<rustc_middle[8414b965ec1e8931]::ty::Ty, !>)>, core[aa444211b5f41879]::iter::traits::iterator::Iterator::find_map::check<(usize, rustc_middle[8414b965ec1e8931]::ty::Ty), (usize, core[aa444211b5f41879]::result::Result<rustc_middle[8414b965ec1e8931]::ty::Ty, !>), rustc_middle[8414b965ec1e8931]::ty::util::fold_list<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder, rustc_middle[8414b965ec1e8931]::ty::Ty, <&rustc_middle[8414b965ec1e8931]::ty::list::List<rustc_middle[8414b965ec1e8931]::ty::Ty> as rustc_type_ir[929cb0070a7abace]::fold::TypeFoldable<rustc_middle[8414b965ec1e8931]::ty::context::TyCtxt>>::try_fold_with<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder>::{closure#0}>::{closure#0}>::{closure#0}>::{closure#0}
                               at /home/matthias/vcs/github/rust_debug_assertions/library/core/src/iter/adapters/enumerate.rs:86:27
  28:     0x7f7cbdc9acbc - core[aa444211b5f41879]::iter::adapters::copied::copy_try_fold::<rustc_middle[8414b965ec1e8931]::ty::Ty, (), core[aa444211b5f41879]::ops::control_flow::ControlFlow<(usize, core[aa444211b5f41879]::result::Result<rustc_middle[8414b965ec1e8931]::ty::Ty, !>)>, <core[aa444211b5f41879]::iter::adapters::enumerate::Enumerate<_> as core[aa444211b5f41879]::iter::traits::iterator::Iterator>::try_fold::enumerate<rustc_middle[8414b965ec1e8931]::ty::Ty, (), core[aa444211b5f41879]::ops::control_flow::ControlFlow<(usize, core[aa444211b5f41879]::result::Result<rustc_middle[8414b965ec1e8931]::ty::Ty, !>)>, core[aa444211b5f41879]::iter::traits::iterator::Iterator::find_map::check<(usize, rustc_middle[8414b965ec1e8931]::ty::Ty), (usize, core[aa444211b5f41879]::result::Result<rustc_middle[8414b965ec1e8931]::ty::Ty, !>), rustc_middle[8414b965ec1e8931]::ty::util::fold_list<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder, rustc_middle[8414b965ec1e8931]::ty::Ty, <&rustc_middle[8414b965ec1e8931]::ty::list::List<rustc_middle[8414b965ec1e8931]::ty::Ty> as rustc_type_ir[929cb0070a7abace]::fold::TypeFoldable<rustc_middle[8414b965ec1e8931]::ty::context::TyCtxt>>::try_fold_with<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder>::{closure#0}>::{closure#0}>::{closure#0}>::{closure#0}>::{closure#0}
                               at /home/matthias/vcs/github/rust_debug_assertions/library/core/src/iter/adapters/copied.rs:36:22
  29:     0x7f7cbdc9acbc - <core[aa444211b5f41879]::slice::iter::Iter<rustc_middle[8414b965ec1e8931]::ty::Ty> as core[aa444211b5f41879]::iter::traits::iterator::Iterator>::try_fold::<(), core[aa444211b5f41879]::iter::adapters::copied::copy_try_fold<rustc_middle[8414b965ec1e8931]::ty::Ty, (), core[aa444211b5f41879]::ops::control_flow::ControlFlow<(usize, core[aa444211b5f41879]::result::Result<rustc_middle[8414b965ec1e8931]::ty::Ty, !>)>, <core[aa444211b5f41879]::iter::adapters::enumerate::Enumerate<_> as core[aa444211b5f41879]::iter::traits::iterator::Iterator>::try_fold::enumerate<rustc_middle[8414b965ec1e8931]::ty::Ty, (), core[aa444211b5f41879]::ops::control_flow::ControlFlow<(usize, core[aa444211b5f41879]::result::Result<rustc_middle[8414b965ec1e8931]::ty::Ty, !>)>, core[aa444211b5f41879]::iter::traits::iterator::Iterator::find_map::check<(usize, rustc_middle[8414b965ec1e8931]::ty::Ty), (usize, core[aa444211b5f41879]::result::Result<rustc_middle[8414b965ec1e8931]::ty::Ty, !>), rustc_middle[8414b965ec1e8931]::ty::util::fold_list<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder, rustc_middle[8414b965ec1e8931]::ty::Ty, <&rustc_middle[8414b965ec1e8931]::ty::list::List<rustc_middle[8414b965ec1e8931]::ty::Ty> as rustc_type_ir[929cb0070a7abace]::fold::TypeFoldable<rustc_middle[8414b965ec1e8931]::ty::context::TyCtxt>>::try_fold_with<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder>::{closure#0}>::{closure#0}>::{closure#0}>::{closure#0}>::{closure#0}, core[aa444211b5f41879]::ops::control_flow::ControlFlow<(usize, core[aa444211b5f41879]::result::Result<rustc_middle[8414b965ec1e8931]::ty::Ty, !>)>>
                               at /home/matthias/vcs/github/rust_debug_assertions/library/core/src/iter/traits/iterator.rs:2462:21
  30:     0x7f7cbdc9acbc - <core[aa444211b5f41879]::iter::adapters::copied::Copied<core[aa444211b5f41879]::slice::iter::Iter<rustc_middle[8414b965ec1e8931]::ty::Ty>> as core[aa444211b5f41879]::iter::traits::iterator::Iterator>::try_fold::<(), <core[aa444211b5f41879]::iter::adapters::enumerate::Enumerate<_> as core[aa444211b5f41879]::iter::traits::iterator::Iterator>::try_fold::enumerate<rustc_middle[8414b965ec1e8931]::ty::Ty, (), core[aa444211b5f41879]::ops::control_flow::ControlFlow<(usize, core[aa444211b5f41879]::result::Result<rustc_middle[8414b965ec1e8931]::ty::Ty, !>)>, core[aa444211b5f41879]::iter::traits::iterator::Iterator::find_map::check<(usize, rustc_middle[8414b965ec1e8931]::ty::Ty), (usize, core[aa444211b5f41879]::result::Result<rustc_middle[8414b965ec1e8931]::ty::Ty, !>), rustc_middle[8414b965ec1e8931]::ty::util::fold_list<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder, rustc_middle[8414b965ec1e8931]::ty::Ty, <&rustc_middle[8414b965ec1e8931]::ty::list::List<rustc_middle[8414b965ec1e8931]::ty::Ty> as rustc_type_ir[929cb0070a7abace]::fold::TypeFoldable<rustc_middle[8414b965ec1e8931]::ty::context::TyCtxt>>::try_fold_with<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder>::{closure#0}>::{closure#0}>::{closure#0}>::{closure#0}, core[aa444211b5f41879]::ops::control_flow::ControlFlow<(usize, core[aa444211b5f41879]::result::Result<rustc_middle[8414b965ec1e8931]::ty::Ty, !>)>>
                               at /home/matthias/vcs/github/rust_debug_assertions/library/core/src/iter/adapters/copied.rs:70:9
  31:     0x7f7cbdc9acbc - <&mut core[aa444211b5f41879]::iter::adapters::copied::Copied<core[aa444211b5f41879]::slice::iter::Iter<rustc_middle[8414b965ec1e8931]::ty::Ty>> as core[aa444211b5f41879]::iter::traits::iterator::IteratorRefSpec>::spec_try_fold::<(), <core[aa444211b5f41879]::iter::adapters::enumerate::Enumerate<_> as core[aa444211b5f41879]::iter::traits::iterator::Iterator>::try_fold::enumerate<rustc_middle[8414b965ec1e8931]::ty::Ty, (), core[aa444211b5f41879]::ops::control_flow::ControlFlow<(usize, core[aa444211b5f41879]::result::Result<rustc_middle[8414b965ec1e8931]::ty::Ty, !>)>, core[aa444211b5f41879]::iter::traits::iterator::Iterator::find_map::check<(usize, rustc_middle[8414b965ec1e8931]::ty::Ty), (usize, core[aa444211b5f41879]::result::Result<rustc_middle[8414b965ec1e8931]::ty::Ty, !>), rustc_middle[8414b965ec1e8931]::ty::util::fold_list<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder, rustc_middle[8414b965ec1e8931]::ty::Ty, <&rustc_middle[8414b965ec1e8931]::ty::list::List<rustc_middle[8414b965ec1e8931]::ty::Ty> as rustc_type_ir[929cb0070a7abace]::fold::TypeFoldable<rustc_middle[8414b965ec1e8931]::ty::context::TyCtxt>>::try_fold_with<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder>::{closure#0}>::{closure#0}>::{closure#0}>::{closure#0}, core[aa444211b5f41879]::ops::control_flow::ControlFlow<(usize, core[aa444211b5f41879]::result::Result<rustc_middle[8414b965ec1e8931]::ty::Ty, !>)>>
                               at /home/matthias/vcs/github/rust_debug_assertions/library/core/src/iter/traits/iterator.rs:4247:9
  32:     0x7f7cbdc9acbc - <&mut core[aa444211b5f41879]::iter::adapters::copied::Copied<core[aa444211b5f41879]::slice::iter::Iter<rustc_middle[8414b965ec1e8931]::ty::Ty>> as core[aa444211b5f41879]::iter::traits::iterator::Iterator>::try_fold::<(), <core[aa444211b5f41879]::iter::adapters::enumerate::Enumerate<_> as core[aa444211b5f41879]::iter::traits::iterator::Iterator>::try_fold::enumerate<rustc_middle[8414b965ec1e8931]::ty::Ty, (), core[aa444211b5f41879]::ops::control_flow::ControlFlow<(usize, core[aa444211b5f41879]::result::Result<rustc_middle[8414b965ec1e8931]::ty::Ty, !>)>, core[aa444211b5f41879]::iter::traits::iterator::Iterator::find_map::check<(usize, rustc_middle[8414b965ec1e8931]::ty::Ty), (usize, core[aa444211b5f41879]::result::Result<rustc_middle[8414b965ec1e8931]::ty::Ty, !>), rustc_middle[8414b965ec1e8931]::ty::util::fold_list<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder, rustc_middle[8414b965ec1e8931]::ty::Ty, <&rustc_middle[8414b965ec1e8931]::ty::list::List<rustc_middle[8414b965ec1e8931]::ty::Ty> as rustc_type_ir[929cb0070a7abace]::fold::TypeFoldable<rustc_middle[8414b965ec1e8931]::ty::context::TyCtxt>>::try_fold_with<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder>::{closure#0}>::{closure#0}>::{closure#0}>::{closure#0}, core[aa444211b5f41879]::ops::control_flow::ControlFlow<(usize, core[aa444211b5f41879]::result::Result<rustc_middle[8414b965ec1e8931]::ty::Ty, !>)>>
                               at /home/matthias/vcs/github/rust_debug_assertions/library/core/src/iter/traits/iterator.rs:4198:9
  33:     0x7f7cbdc9acbc - <core[aa444211b5f41879]::iter::adapters::enumerate::Enumerate<&mut core[aa444211b5f41879]::iter::adapters::copied::Copied<core[aa444211b5f41879]::slice::iter::Iter<rustc_middle[8414b965ec1e8931]::ty::Ty>>> as core[aa444211b5f41879]::iter::traits::iterator::Iterator>::try_fold::<(), core[aa444211b5f41879]::iter::traits::iterator::Iterator::find_map::check<(usize, rustc_middle[8414b965ec1e8931]::ty::Ty), (usize, core[aa444211b5f41879]::result::Result<rustc_middle[8414b965ec1e8931]::ty::Ty, !>), rustc_middle[8414b965ec1e8931]::ty::util::fold_list<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder, rustc_middle[8414b965ec1e8931]::ty::Ty, <&rustc_middle[8414b965ec1e8931]::ty::list::List<rustc_middle[8414b965ec1e8931]::ty::Ty> as rustc_type_ir[929cb0070a7abace]::fold::TypeFoldable<rustc_middle[8414b965ec1e8931]::ty::context::TyCtxt>>::try_fold_with<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder>::{closure#0}>::{closure#0}>::{closure#0}, core[aa444211b5f41879]::ops::control_flow::ControlFlow<(usize, core[aa444211b5f41879]::result::Result<rustc_middle[8414b965ec1e8931]::ty::Ty, !>)>>
                               at /home/matthias/vcs/github/rust_debug_assertions/library/core/src/iter/adapters/enumerate.rs:92:9
  34:     0x7f7cbdc9acbc - <core[aa444211b5f41879]::iter::adapters::enumerate::Enumerate<&mut core[aa444211b5f41879]::iter::adapters::copied::Copied<core[aa444211b5f41879]::slice::iter::Iter<rustc_middle[8414b965ec1e8931]::ty::Ty>>> as core[aa444211b5f41879]::iter::traits::iterator::Iterator>::find_map::<(usize, core[aa444211b5f41879]::result::Result<rustc_middle[8414b965ec1e8931]::ty::Ty, !>), rustc_middle[8414b965ec1e8931]::ty::util::fold_list<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder, rustc_middle[8414b965ec1e8931]::ty::Ty, <&rustc_middle[8414b965ec1e8931]::ty::list::List<rustc_middle[8414b965ec1e8931]::ty::Ty> as rustc_type_ir[929cb0070a7abace]::fold::TypeFoldable<rustc_middle[8414b965ec1e8931]::ty::context::TyCtxt>>::try_fold_with<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder>::{closure#0}>::{closure#0}>
                               at /home/matthias/vcs/github/rust_debug_assertions/library/core/src/iter/traits/iterator.rs:2964:9
  35:     0x7f7cbdc9acbc - rustc_middle[8414b965ec1e8931]::ty::util::fold_list::<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder, rustc_middle[8414b965ec1e8931]::ty::Ty, <&rustc_middle[8414b965ec1e8931]::ty::list::List<rustc_middle[8414b965ec1e8931]::ty::Ty> as rustc_type_ir[929cb0070a7abace]::fold::TypeFoldable<rustc_middle[8414b965ec1e8931]::ty::context::TyCtxt>>::try_fold_with<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder>::{closure#0}>
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_middle/src/ty/util.rs:1494:11
  36:     0x7f7cbdc9acbc - <&rustc_middle[8414b965ec1e8931]::ty::list::List<rustc_middle[8414b965ec1e8931]::ty::Ty> as rustc_type_ir[929cb0070a7abace]::fold::TypeFoldable<rustc_middle[8414b965ec1e8931]::ty::context::TyCtxt>>::try_fold_with::<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder>
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_middle/src/ty/generic_args.rs:551:18
  37:     0x7f7cbdd7a99e - <rustc_middle[8414b965ec1e8931]::ty::Ty as rustc_type_ir[929cb0070a7abace]::fold::TypeSuperFoldable<rustc_middle[8414b965ec1e8931]::ty::context::TyCtxt>>::try_super_fold_with::<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder>
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_middle/src/ty/structural_impls.rs:576:40
  38:     0x7f7cbdca12a0 - <rustc_middle[8414b965ec1e8931]::ty::Ty as rustc_type_ir[929cb0070a7abace]::fold::TypeSuperFoldable<rustc_middle[8414b965ec1e8931]::ty::context::TyCtxt>>::super_fold_with::<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder>
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_type_ir/src/fold.rs:112:15
  39:     0x7f7cbdca12a0 - <rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder as rustc_type_ir[929cb0070a7abace]::fold::TypeFolder<rustc_middle[8414b965ec1e8931]::ty::context::TyCtxt>>::fold_ty
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_middle/src/ty/instance.rs:804:25
  40:     0x7f7cbdc907af - <rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder as rustc_type_ir[929cb0070a7abace]::fold::FallibleTypeFolder<rustc_middle[8414b965ec1e8931]::ty::context::TyCtxt>>::try_fold_ty
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_type_ir/src/fold.rs:241:12
  41:     0x7f7cbdc907af - <rustc_middle[8414b965ec1e8931]::ty::Ty as rustc_type_ir[929cb0070a7abace]::fold::TypeFoldable<rustc_middle[8414b965ec1e8931]::ty::context::TyCtxt>>::try_fold_with::<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder>
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_middle/src/ty/structural_impls.rs:551:9
  42:     0x7f7cbdc907af - <rustc_middle[8414b965ec1e8931]::ty::Ty as rustc_type_ir[929cb0070a7abace]::fold::TypeFoldable<rustc_middle[8414b965ec1e8931]::ty::context::TyCtxt>>::fold_with::<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder>
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_type_ir/src/fold.rs:88:15
  43:     0x7f7cbdc907af - rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::{closure#1}
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_middle/src/ty/instance.rs:823:61
  44:     0x7f7cbdc907af - <rustc_middle[8414b965ec1e8931]::ty::list::List<rustc_middle[8414b965ec1e8931]::ty::generic_args::GenericArg>>::fill_single::<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::{closure#1}>
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_middle/src/ty/generic_args.rs:374:24
  45:     0x7f7cbdc907af - <rustc_middle[8414b965ec1e8931]::ty::list::List<rustc_middle[8414b965ec1e8931]::ty::generic_args::GenericArg>>::fill_item::<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::{closure#1}>
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_middle/src/ty/generic_args.rs:362:9
  46:     0x7f7cbdca0ccd - <rustc_middle[8414b965ec1e8931]::ty::list::List<rustc_middle[8414b965ec1e8931]::ty::generic_args::GenericArg>>::for_item::<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::{closure#1}>
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_middle/src/ty/generic_args.rs:332:9
  47:     0x7f7cbdca0ccd - rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_middle/src/ty/instance.rs:809:5
  48:     0x7f7cbdca127e - <rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder as rustc_type_ir[929cb0070a7abace]::fold::TypeFolder<rustc_middle[8414b965ec1e8931]::ty::context::TyCtxt>>::fold_ty
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_middle/src/ty/instance.rs:788:25
  49:     0x7f7cbdc95ef0 - <rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder as rustc_type_ir[929cb0070a7abace]::fold::FallibleTypeFolder<rustc_middle[8414b965ec1e8931]::ty::context::TyCtxt>>::try_fold_ty
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_type_ir/src/fold.rs:241:12
  50:     0x7f7cbdc95ef0 - <rustc_middle[8414b965ec1e8931]::ty::Ty as rustc_type_ir[929cb0070a7abace]::fold::TypeFoldable<rustc_middle[8414b965ec1e8931]::ty::context::TyCtxt>>::try_fold_with::<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder>
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_middle/src/ty/structural_impls.rs:551:9
  51:     0x7f7cbdc95ef0 - <rustc_middle[8414b965ec1e8931]::ty::generic_args::GenericArg as rustc_type_ir[929cb0070a7abace]::fold::TypeFoldable<rustc_middle[8414b965ec1e8931]::ty::context::TyCtxt>>::try_fold_with::<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder>
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_middle/src/ty/generic_args.rs:237:44
  52:     0x7f7cbdc95ef0 - <&rustc_middle[8414b965ec1e8931]::ty::list::List<rustc_middle[8414b965ec1e8931]::ty::generic_args::GenericArg> as rustc_type_ir[929cb0070a7abace]::fold::TypeFoldable<rustc_middle[8414b965ec1e8931]::ty::context::TyCtxt>>::try_fold_with::<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder>
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_middle/src/ty/generic_args.rs:503:30
  53:     0x7f7cbdd7a7f5 - <rustc_middle[8414b965ec1e8931]::ty::Ty as rustc_type_ir[929cb0070a7abace]::fold::TypeSuperFoldable<rustc_middle[8414b965ec1e8931]::ty::context::TyCtxt>>::try_super_fold_with::<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder>
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_middle/src/ty/structural_impls.rs:570:48
  54:     0x7f7cbdca12a0 - <rustc_middle[8414b965ec1e8931]::ty::Ty as rustc_type_ir[929cb0070a7abace]::fold::TypeSuperFoldable<rustc_middle[8414b965ec1e8931]::ty::context::TyCtxt>>::super_fold_with::<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder>
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_type_ir/src/fold.rs:112:15
  55:     0x7f7cbdca12a0 - <rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder as rustc_type_ir[929cb0070a7abace]::fold::TypeFolder<rustc_middle[8414b965ec1e8931]::ty::context::TyCtxt>>::fold_ty
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_middle/src/ty/instance.rs:804:25
  56:     0x7f7cbdc9acbc - <rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder as rustc_type_ir[929cb0070a7abace]::fold::FallibleTypeFolder<rustc_middle[8414b965ec1e8931]::ty::context::TyCtxt>>::try_fold_ty
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_type_ir/src/fold.rs:241:12
  57:     0x7f7cbdc9acbc - <rustc_middle[8414b965ec1e8931]::ty::Ty as rustc_type_ir[929cb0070a7abace]::fold::TypeFoldable<rustc_middle[8414b965ec1e8931]::ty::context::TyCtxt>>::try_fold_with::<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder>
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_middle/src/ty/structural_impls.rs:551:9
  58:     0x7f7cbdc9acbc - rustc_middle[8414b965ec1e8931]::ty::util::fold_list::<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder, rustc_middle[8414b965ec1e8931]::ty::Ty, <&rustc_middle[8414b965ec1e8931]::ty::list::List<rustc_middle[8414b965ec1e8931]::ty::Ty> as rustc_type_ir[929cb0070a7abace]::fold::TypeFoldable<rustc_middle[8414b965ec1e8931]::ty::context::TyCtxt>>::try_fold_with<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder>::{closure#0}>::{closure#0}
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_middle/src/ty/util.rs:1494:61
  59:     0x7f7cbdc9acbc - core[aa444211b5f41879]::iter::traits::iterator::Iterator::find_map::check::<(usize, rustc_middle[8414b965ec1e8931]::ty::Ty), (usize, core[aa444211b5f41879]::result::Result<rustc_middle[8414b965ec1e8931]::ty::Ty, !>), rustc_middle[8414b965ec1e8931]::ty::util::fold_list<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder, rustc_middle[8414b965ec1e8931]::ty::Ty, <&rustc_middle[8414b965ec1e8931]::ty::list::List<rustc_middle[8414b965ec1e8931]::ty::Ty> as rustc_type_ir[929cb0070a7abace]::fold::TypeFoldable<rustc_middle[8414b965ec1e8931]::ty::context::TyCtxt>>::try_fold_with<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder>::{closure#0}>::{closure#0}>::{closure#0}
                               at /home/matthias/vcs/github/rust_debug_assertions/library/core/src/iter/traits/iterator.rs:2958:32
  60:     0x7f7cbdc9acbc - <core[aa444211b5f41879]::iter::adapters::enumerate::Enumerate<_> as core[aa444211b5f41879]::iter::traits::iterator::Iterator>::try_fold::enumerate::<rustc_middle[8414b965ec1e8931]::ty::Ty, (), core[aa444211b5f41879]::ops::control_flow::ControlFlow<(usize, core[aa444211b5f41879]::result::Result<rustc_middle[8414b965ec1e8931]::ty::Ty, !>)>, core[aa444211b5f41879]::iter::traits::iterator::Iterator::find_map::check<(usize, rustc_middle[8414b965ec1e8931]::ty::Ty), (usize, core[aa444211b5f41879]::result::Result<rustc_middle[8414b965ec1e8931]::ty::Ty, !>), rustc_middle[8414b965ec1e8931]::ty::util::fold_list<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder, rustc_middle[8414b965ec1e8931]::ty::Ty, <&rustc_middle[8414b965ec1e8931]::ty::list::List<rustc_middle[8414b965ec1e8931]::ty::Ty> as rustc_type_ir[929cb0070a7abace]::fold::TypeFoldable<rustc_middle[8414b965ec1e8931]::ty::context::TyCtxt>>::try_fold_with<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder>::{closure#0}>::{closure#0}>::{closure#0}>::{closure#0}
                               at /home/matthias/vcs/github/rust_debug_assertions/library/core/src/iter/adapters/enumerate.rs:86:27
  61:     0x7f7cbdc9acbc - core[aa444211b5f41879]::iter::adapters::copied::copy_try_fold::<rustc_middle[8414b965ec1e8931]::ty::Ty, (), core[aa444211b5f41879]::ops::control_flow::ControlFlow<(usize, core[aa444211b5f41879]::result::Result<rustc_middle[8414b965ec1e8931]::ty::Ty, !>)>, <core[aa444211b5f41879]::iter::adapters::enumerate::Enumerate<_> as core[aa444211b5f41879]::iter::traits::iterator::Iterator>::try_fold::enumerate<rustc_middle[8414b965ec1e8931]::ty::Ty, (), core[aa444211b5f41879]::ops::control_flow::ControlFlow<(usize, core[aa444211b5f41879]::result::Result<rustc_middle[8414b965ec1e8931]::ty::Ty, !>)>, core[aa444211b5f41879]::iter::traits::iterator::Iterator::find_map::check<(usize, rustc_middle[8414b965ec1e8931]::ty::Ty), (usize, core[aa444211b5f41879]::result::Result<rustc_middle[8414b965ec1e8931]::ty::Ty, !>), rustc_middle[8414b965ec1e8931]::ty::util::fold_list<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder, rustc_middle[8414b965ec1e8931]::ty::Ty, <&rustc_middle[8414b965ec1e8931]::ty::list::List<rustc_middle[8414b965ec1e8931]::ty::Ty> as rustc_type_ir[929cb0070a7abace]::fold::TypeFoldable<rustc_middle[8414b965ec1e8931]::ty::context::TyCtxt>>::try_fold_with<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder>::{closure#0}>::{closure#0}>::{closure#0}>::{closure#0}>::{closure#0}
                               at /home/matthias/vcs/github/rust_debug_assertions/library/core/src/iter/adapters/copied.rs:36:22
  62:     0x7f7cbdc9acbc - <core[aa444211b5f41879]::slice::iter::Iter<rustc_middle[8414b965ec1e8931]::ty::Ty> as core[aa444211b5f41879]::iter::traits::iterator::Iterator>::try_fold::<(), core[aa444211b5f41879]::iter::adapters::copied::copy_try_fold<rustc_middle[8414b965ec1e8931]::ty::Ty, (), core[aa444211b5f41879]::ops::control_flow::ControlFlow<(usize, core[aa444211b5f41879]::result::Result<rustc_middle[8414b965ec1e8931]::ty::Ty, !>)>, <core[aa444211b5f41879]::iter::adapters::enumerate::Enumerate<_> as core[aa444211b5f41879]::iter::traits::iterator::Iterator>::try_fold::enumerate<rustc_middle[8414b965ec1e8931]::ty::Ty, (), core[aa444211b5f41879]::ops::control_flow::ControlFlow<(usize, core[aa444211b5f41879]::result::Result<rustc_middle[8414b965ec1e8931]::ty::Ty, !>)>, core[aa444211b5f41879]::iter::traits::iterator::Iterator::find_map::check<(usize, rustc_middle[8414b965ec1e8931]::ty::Ty), (usize, core[aa444211b5f41879]::result::Result<rustc_middle[8414b965ec1e8931]::ty::Ty, !>), rustc_middle[8414b965ec1e8931]::ty::util::fold_list<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder, rustc_middle[8414b965ec1e8931]::ty::Ty, <&rustc_middle[8414b965ec1e8931]::ty::list::List<rustc_middle[8414b965ec1e8931]::ty::Ty> as rustc_type_ir[929cb0070a7abace]::fold::TypeFoldable<rustc_middle[8414b965ec1e8931]::ty::context::TyCtxt>>::try_fold_with<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder>::{closure#0}>::{closure#0}>::{closure#0}>::{closure#0}>::{closure#0}, core[aa444211b5f41879]::ops::control_flow::ControlFlow<(usize, core[aa444211b5f41879]::result::Result<rustc_middle[8414b965ec1e8931]::ty::Ty, !>)>>
                               at /home/matthias/vcs/github/rust_debug_assertions/library/core/src/iter/traits/iterator.rs:2462:21
  63:     0x7f7cbdc9acbc - <core[aa444211b5f41879]::iter::adapters::copied::Copied<core[aa444211b5f41879]::slice::iter::Iter<rustc_middle[8414b965ec1e8931]::ty::Ty>> as core[aa444211b5f41879]::iter::traits::iterator::Iterator>::try_fold::<(), <core[aa444211b5f41879]::iter::adapters::enumerate::Enumerate<_> as core[aa444211b5f41879]::iter::traits::iterator::Iterator>::try_fold::enumerate<rustc_middle[8414b965ec1e8931]::ty::Ty, (), core[aa444211b5f41879]::ops::control_flow::ControlFlow<(usize, core[aa444211b5f41879]::result::Result<rustc_middle[8414b965ec1e8931]::ty::Ty, !>)>, core[aa444211b5f41879]::iter::traits::iterator::Iterator::find_map::check<(usize, rustc_middle[8414b965ec1e8931]::ty::Ty), (usize, core[aa444211b5f41879]::result::Result<rustc_middle[8414b965ec1e8931]::ty::Ty, !>), rustc_middle[8414b965ec1e8931]::ty::util::fold_list<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder, rustc_middle[8414b965ec1e8931]::ty::Ty, <&rustc_middle[8414b965ec1e8931]::ty::list::List<rustc_middle[8414b965ec1e8931]::ty::Ty> as rustc_type_ir[929cb0070a7abace]::fold::TypeFoldable<rustc_middle[8414b965ec1e8931]::ty::context::TyCtxt>>::try_fold_with<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder>::{closure#0}>::{closure#0}>::{closure#0}>::{closure#0}, core[aa444211b5f41879]::ops::control_flow::ControlFlow<(usize, core[aa444211b5f41879]::result::Result<rustc_middle[8414b965ec1e8931]::ty::Ty, !>)>>
                               at /home/matthias/vcs/github/rust_debug_assertions/library/core/src/iter/adapters/copied.rs:70:9
  64:     0x7f7cbdc9acbc - <&mut core[aa444211b5f41879]::iter::adapters::copied::Copied<core[aa444211b5f41879]::slice::iter::Iter<rustc_middle[8414b965ec1e8931]::ty::Ty>> as core[aa444211b5f41879]::iter::traits::iterator::IteratorRefSpec>::spec_try_fold::<(), <core[aa444211b5f41879]::iter::adapters::enumerate::Enumerate<_> as core[aa444211b5f41879]::iter::traits::iterator::Iterator>::try_fold::enumerate<rustc_middle[8414b965ec1e8931]::ty::Ty, (), core[aa444211b5f41879]::ops::control_flow::ControlFlow<(usize, core[aa444211b5f41879]::result::Result<rustc_middle[8414b965ec1e8931]::ty::Ty, !>)>, core[aa444211b5f41879]::iter::traits::iterator::Iterator::find_map::check<(usize, rustc_middle[8414b965ec1e8931]::ty::Ty), (usize, core[aa444211b5f41879]::result::Result<rustc_middle[8414b965ec1e8931]::ty::Ty, !>), rustc_middle[8414b965ec1e8931]::ty::util::fold_list<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder, rustc_middle[8414b965ec1e8931]::ty::Ty, <&rustc_middle[8414b965ec1e8931]::ty::list::List<rustc_middle[8414b965ec1e8931]::ty::Ty> as rustc_type_ir[929cb0070a7abace]::fold::TypeFoldable<rustc_middle[8414b965ec1e8931]::ty::context::TyCtxt>>::try_fold_with<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder>::{closure#0}>::{closure#0}>::{closure#0}>::{closure#0}, core[aa444211b5f41879]::ops::control_flow::ControlFlow<(usize, core[aa444211b5f41879]::result::Result<rustc_middle[8414b965ec1e8931]::ty::Ty, !>)>>
                               at /home/matthias/vcs/github/rust_debug_assertions/library/core/src/iter/traits/iterator.rs:4247:9
  65:     0x7f7cbdc9acbc - <&mut core[aa444211b5f41879]::iter::adapters::copied::Copied<core[aa444211b5f41879]::slice::iter::Iter<rustc_middle[8414b965ec1e8931]::ty::Ty>> as core[aa444211b5f41879]::iter::traits::iterator::Iterator>::try_fold::<(), <core[aa444211b5f41879]::iter::adapters::enumerate::Enumerate<_> as core[aa444211b5f41879]::iter::traits::iterator::Iterator>::try_fold::enumerate<rustc_middle[8414b965ec1e8931]::ty::Ty, (), core[aa444211b5f41879]::ops::control_flow::ControlFlow<(usize, core[aa444211b5f41879]::result::Result<rustc_middle[8414b965ec1e8931]::ty::Ty, !>)>, core[aa444211b5f41879]::iter::traits::iterator::Iterator::find_map::check<(usize, rustc_middle[8414b965ec1e8931]::ty::Ty), (usize, core[aa444211b5f41879]::result::Result<rustc_middle[8414b965ec1e8931]::ty::Ty, !>), rustc_middle[8414b965ec1e8931]::ty::util::fold_list<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder, rustc_middle[8414b965ec1e8931]::ty::Ty, <&rustc_middle[8414b965ec1e8931]::ty::list::List<rustc_middle[8414b965ec1e8931]::ty::Ty> as rustc_type_ir[929cb0070a7abace]::fold::TypeFoldable<rustc_middle[8414b965ec1e8931]::ty::context::TyCtxt>>::try_fold_with<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder>::{closure#0}>::{closure#0}>::{closure#0}>::{closure#0}, core[aa444211b5f41879]::ops::control_flow::ControlFlow<(usize, core[aa444211b5f41879]::result::Result<rustc_middle[8414b965ec1e8931]::ty::Ty, !>)>>
                               at /home/matthias/vcs/github/rust_debug_assertions/library/core/src/iter/traits/iterator.rs:4198:9
  66:     0x7f7cbdc9acbc - <core[aa444211b5f41879]::iter::adapters::enumerate::Enumerate<&mut core[aa444211b5f41879]::iter::adapters::copied::Copied<core[aa444211b5f41879]::slice::iter::Iter<rustc_middle[8414b965ec1e8931]::ty::Ty>>> as core[aa444211b5f41879]::iter::traits::iterator::Iterator>::try_fold::<(), core[aa444211b5f41879]::iter::traits::iterator::Iterator::find_map::check<(usize, rustc_middle[8414b965ec1e8931]::ty::Ty), (usize, core[aa444211b5f41879]::result::Result<rustc_middle[8414b965ec1e8931]::ty::Ty, !>), rustc_middle[8414b965ec1e8931]::ty::util::fold_list<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder, rustc_middle[8414b965ec1e8931]::ty::Ty, <&rustc_middle[8414b965ec1e8931]::ty::list::List<rustc_middle[8414b965ec1e8931]::ty::Ty> as rustc_type_ir[929cb0070a7abace]::fold::TypeFoldable<rustc_middle[8414b965ec1e8931]::ty::context::TyCtxt>>::try_fold_with<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder>::{closure#0}>::{closure#0}>::{closure#0}, core[aa444211b5f41879]::ops::control_flow::ControlFlow<(usize, core[aa444211b5f41879]::result::Result<rustc_middle[8414b965ec1e8931]::ty::Ty, !>)>>
                               at /home/matthias/vcs/github/rust_debug_assertions/library/core/src/iter/adapters/enumerate.rs:92:9
  67:     0x7f7cbdc9acbc - <core[aa444211b5f41879]::iter::adapters::enumerate::Enumerate<&mut core[aa444211b5f41879]::iter::adapters::copied::Copied<core[aa444211b5f41879]::slice::iter::Iter<rustc_middle[8414b965ec1e8931]::ty::Ty>>> as core[aa444211b5f41879]::iter::traits::iterator::Iterator>::find_map::<(usize, core[aa444211b5f41879]::result::Result<rustc_middle[8414b965ec1e8931]::ty::Ty, !>), rustc_middle[8414b965ec1e8931]::ty::util::fold_list<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder, rustc_middle[8414b965ec1e8931]::ty::Ty, <&rustc_middle[8414b965ec1e8931]::ty::list::List<rustc_middle[8414b965ec1e8931]::ty::Ty> as rustc_type_ir[929cb0070a7abace]::fold::TypeFoldable<rustc_middle[8414b965ec1e8931]::ty::context::TyCtxt>>::try_fold_with<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder>::{closure#0}>::{closure#0}>
                               at /home/matthias/vcs/github/rust_debug_assertions/library/core/src/iter/traits/iterator.rs:2964:9
  68:     0x7f7cbdc9acbc - rustc_middle[8414b965ec1e8931]::ty::util::fold_list::<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder, rustc_middle[8414b965ec1e8931]::ty::Ty, <&rustc_middle[8414b965ec1e8931]::ty::list::List<rustc_middle[8414b965ec1e8931]::ty::Ty> as rustc_type_ir[929cb0070a7abace]::fold::TypeFoldable<rustc_middle[8414b965ec1e8931]::ty::context::TyCtxt>>::try_fold_with<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder>::{closure#0}>
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_middle/src/ty/util.rs:1494:11
  69:     0x7f7cbdc9acbc - <&rustc_middle[8414b965ec1e8931]::ty::list::List<rustc_middle[8414b965ec1e8931]::ty::Ty> as rustc_type_ir[929cb0070a7abace]::fold::TypeFoldable<rustc_middle[8414b965ec1e8931]::ty::context::TyCtxt>>::try_fold_with::<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder>
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_middle/src/ty/generic_args.rs:551:18
  70:     0x7f7cbdd7a99e - <rustc_middle[8414b965ec1e8931]::ty::Ty as rustc_type_ir[929cb0070a7abace]::fold::TypeSuperFoldable<rustc_middle[8414b965ec1e8931]::ty::context::TyCtxt>>::try_super_fold_with::<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder>
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_middle/src/ty/structural_impls.rs:576:40
  71:     0x7f7cbdca12a0 - <rustc_middle[8414b965ec1e8931]::ty::Ty as rustc_type_ir[929cb0070a7abace]::fold::TypeSuperFoldable<rustc_middle[8414b965ec1e8931]::ty::context::TyCtxt>>::super_fold_with::<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder>
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_type_ir/src/fold.rs:112:15
  72:     0x7f7cbdca12a0 - <rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder as rustc_type_ir[929cb0070a7abace]::fold::TypeFolder<rustc_middle[8414b965ec1e8931]::ty::context::TyCtxt>>::fold_ty
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_middle/src/ty/instance.rs:804:25
  73:     0x7f7cbdc907af - <rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder as rustc_type_ir[929cb0070a7abace]::fold::FallibleTypeFolder<rustc_middle[8414b965ec1e8931]::ty::context::TyCtxt>>::try_fold_ty
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_type_ir/src/fold.rs:241:12
  74:     0x7f7cbdc907af - <rustc_middle[8414b965ec1e8931]::ty::Ty as rustc_type_ir[929cb0070a7abace]::fold::TypeFoldable<rustc_middle[8414b965ec1e8931]::ty::context::TyCtxt>>::try_fold_with::<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder>
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_middle/src/ty/structural_impls.rs:551:9
  75:     0x7f7cbdc907af - <rustc_middle[8414b965ec1e8931]::ty::Ty as rustc_type_ir[929cb0070a7abace]::fold::TypeFoldable<rustc_middle[8414b965ec1e8931]::ty::context::TyCtxt>>::fold_with::<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::PolymorphizationFolder>
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_type_ir/src/fold.rs:88:15
  76:     0x7f7cbdc907af - rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::{closure#1}
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_middle/src/ty/instance.rs:823:61
  77:     0x7f7cbdc907af - <rustc_middle[8414b965ec1e8931]::ty::list::List<rustc_middle[8414b965ec1e8931]::ty::generic_args::GenericArg>>::fill_single::<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::{closure#1}>
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_middle/src/ty/generic_args.rs:374:24
  78:     0x7f7cbdc907af - <rustc_middle[8414b965ec1e8931]::ty::list::List<rustc_middle[8414b965ec1e8931]::ty::generic_args::GenericArg>>::fill_item::<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::{closure#1}>
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_middle/src/ty/generic_args.rs:362:9
  79:     0x7f7cbdca0ccd - <rustc_middle[8414b965ec1e8931]::ty::list::List<rustc_middle[8414b965ec1e8931]::ty::generic_args::GenericArg>>::for_item::<rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize::{closure#1}>
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_middle/src/ty/generic_args.rs:332:9
  80:     0x7f7cbdca0ccd - rustc_middle[8414b965ec1e8931]::ty::instance::polymorphize
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_middle/src/ty/instance.rs:809:5
  81:     0x7f7cbdca00d1 - <rustc_middle[8414b965ec1e8931]::ty::instance::Instance>::polymorphize
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_middle/src/ty/instance.rs:746:34
  82:     0x7f7cbe383363 - rustc_monomorphize[e9a13ccb3a3d72c]::collector::should_codegen_locally
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_monomorphize/src/collector.rs:1015:12
  83:     0x7f7cbe382ece - rustc_monomorphize[e9a13ccb3a3d72c]::collector::visit_instance_use
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_monomorphize/src/collector.rs:948:9
  84:     0x7f7cbe38200f - rustc_monomorphize[e9a13ccb3a3d72c]::collector::visit_fn_use
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_monomorphize/src/collector.rs:936:9
  85:     0x7f7cbe38200f - <rustc_monomorphize[e9a13ccb3a3d72c]::collector::MirUsedCollector as rustc_middle[8414b965ec1e8931]::mir::visit::Visitor>::visit_terminator
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_monomorphize/src/collector.rs:845:17
  86:     0x7f7cbe38bdb4 - <rustc_monomorphize[e9a13ccb3a3d72c]::collector::MirUsedCollector as rustc_middle[8414b965ec1e8931]::mir::visit::Visitor>::super_basic_block_data
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_middle/src/mir/visit.rs:313:21
  87:     0x7f7cbe38bdb4 - <rustc_monomorphize[e9a13ccb3a3d72c]::collector::MirUsedCollector as rustc_middle[8414b965ec1e8931]::mir::visit::Visitor>::visit_basic_block_data
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_middle/src/mir/visit.rs:88:17
  88:     0x7f7cbe38bdb4 - <rustc_monomorphize[e9a13ccb3a3d72c]::collector::MirUsedCollector as rustc_middle[8414b965ec1e8931]::mir::visit::Visitor>::super_body
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_middle/src/mir/visit.rs:292:17
  89:     0x7f7cbe38bdb4 - <rustc_monomorphize[e9a13ccb3a3d72c]::collector::MirUsedCollector as rustc_middle[8414b965ec1e8931]::mir::visit::Visitor>::visit_body
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_middle/src/mir/visit.rs:1216:1
  90:     0x7f7cbe38bdb4 - rustc_monomorphize[e9a13ccb3a3d72c]::collector::collect_used_items
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_monomorphize/src/collector.rs:1489:6
  91:     0x7f7cbe388b54 - rustc_monomorphize[e9a13ccb3a3d72c]::collector::collect_items_rec::{closure#0}
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_monomorphize/src/collector.rs:419:17
  92:     0x7f7cbe388b54 - stacker[bd635a8d74548ce]::maybe_grow::<(), rustc_monomorphize[e9a13ccb3a3d72c]::collector::collect_items_rec::{closure#0}>
                               at /home/matthias/.cargo/registry/src/index.crates.io-6f17d22bba15001f/stacker-0.1.15/src/lib.rs:55:9
  93:     0x7f7cbe388b54 - rustc_data_structures[e95f3e36f9618881]::stack::ensure_sufficient_stack::<(), rustc_monomorphize[e9a13ccb3a3d72c]::collector::collect_items_rec::{closure#0}>
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_data_structures/src/stack.rs:17:5
  94:     0x7f7cbe388b54 - rustc_monomorphize[e9a13ccb3a3d72c]::collector::collect_items_rec
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_monomorphize/src/collector.rs:418:13
  95:     0x7f7cbe38916f - rustc_monomorphize[e9a13ccb3a3d72c]::collector::collect_items_rec
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_monomorphize/src/collector.rs:475:9
  96:     0x7f7cbe38916f - rustc_monomorphize[e9a13ccb3a3d72c]::collector::collect_items_rec
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_monomorphize/src/collector.rs:475:9
  97:     0x7f7cbe38916f - rustc_monomorphize[e9a13ccb3a3d72c]::collector::collect_items_rec
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_monomorphize/src/collector.rs:475:9
  98:     0x7f7cbe38916f - rustc_monomorphize[e9a13ccb3a3d72c]::collector::collect_items_rec
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_monomorphize/src/collector.rs:475:9
  99:     0x7f7cbe3f33f9 - rustc_monomorphize[e9a13ccb3a3d72c]::collector::collect_crate_mono_items::{closure#1}::{closure#0}
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_monomorphize/src/collector.rs:279:17
 100:     0x7f7cbe3f33f9 - rustc_data_structures[e95f3e36f9618881]::sync::parallel::enabled::par_for_each_in::<rustc_middle[8414b965ec1e8931]::mir::mono::MonoItem, alloc[3b5cf733b6b27210]::vec::Vec<rustc_middle[8414b965ec1e8931]::mir::mono::MonoItem>, rustc_monomorphize[e9a13ccb3a3d72c]::collector::collect_crate_mono_items::{closure#1}::{closure#0}>::{closure#0}::{closure#0}::{closure#0}
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_data_structures/src/sync/parallel.rs:182:34
 101:     0x7f7cbe3f33f9 - <core[aa444211b5f41879]::panic::unwind_safe::AssertUnwindSafe<rustc_data_structures[e95f3e36f9618881]::sync::parallel::enabled::par_for_each_in<rustc_middle[8414b965ec1e8931]::mir::mono::MonoItem, alloc[3b5cf733b6b27210]::vec::Vec<rustc_middle[8414b965ec1e8931]::mir::mono::MonoItem>, rustc_monomorphize[e9a13ccb3a3d72c]::collector::collect_crate_mono_items::{closure#1}::{closure#0}>::{closure#0}::{closure#0}::{closure#0}> as core[aa444211b5f41879]::ops::function::FnOnce<()>>::call_once
                               at /home/matthias/vcs/github/rust_debug_assertions/library/core/src/panic/unwind_safe.rs:272:9
 102:     0x7f7cbe3f33f9 - std[1ba472e493b6ecda]::panicking::try::do_call::<core[aa444211b5f41879]::panic::unwind_safe::AssertUnwindSafe<rustc_data_structures[e95f3e36f9618881]::sync::parallel::enabled::par_for_each_in<rustc_middle[8414b965ec1e8931]::mir::mono::MonoItem, alloc[3b5cf733b6b27210]::vec::Vec<rustc_middle[8414b965ec1e8931]::mir::mono::MonoItem>, rustc_monomorphize[e9a13ccb3a3d72c]::collector::collect_crate_mono_items::{closure#1}::{closure#0}>::{closure#0}::{closure#0}::{closure#0}>, ()>
                               at /home/matthias/vcs/github/rust_debug_assertions/library/std/src/panicking.rs:554:40
 103:     0x7f7cbe3f33f9 - std[1ba472e493b6ecda]::panicking::try::<(), core[aa444211b5f41879]::panic::unwind_safe::AssertUnwindSafe<rustc_data_structures[e95f3e36f9618881]::sync::parallel::enabled::par_for_each_in<rustc_middle[8414b965ec1e8931]::mir::mono::MonoItem, alloc[3b5cf733b6b27210]::vec::Vec<rustc_middle[8414b965ec1e8931]::mir::mono::MonoItem>, rustc_monomorphize[e9a13ccb3a3d72c]::collector::collect_crate_mono_items::{closure#1}::{closure#0}>::{closure#0}::{closure#0}::{closure#0}>>
                               at /home/matthias/vcs/github/rust_debug_assertions/library/std/src/panicking.rs:518:19
 104:     0x7f7cbe3ebbe7 - std[1ba472e493b6ecda]::panic::catch_unwind::<core[aa444211b5f41879]::panic::unwind_safe::AssertUnwindSafe<rustc_data_structures[e95f3e36f9618881]::sync::parallel::enabled::par_for_each_in<rustc_middle[8414b965ec1e8931]::mir::mono::MonoItem, alloc[3b5cf733b6b27210]::vec::Vec<rustc_middle[8414b965ec1e8931]::mir::mono::MonoItem>, rustc_monomorphize[e9a13ccb3a3d72c]::collector::collect_crate_mono_items::{closure#1}::{closure#0}>::{closure#0}::{closure#1}::{closure#0}>, ()>
                               at /home/matthias/vcs/github/rust_debug_assertions/library/std/src/panic.rs:142:14
 105:     0x7f7cbe3ebbe7 - <rustc_data_structures[e95f3e36f9618881]::sync::parallel::ParallelGuard>::run::<(), rustc_data_structures[e95f3e36f9618881]::sync::parallel::enabled::par_for_each_in<rustc_middle[8414b965ec1e8931]::mir::mono::MonoItem, alloc[3b5cf733b6b27210]::vec::Vec<rustc_middle[8414b965ec1e8931]::mir::mono::MonoItem>, rustc_monomorphize[e9a13ccb3a3d72c]::collector::collect_crate_mono_items::{closure#1}::{closure#0}>::{closure#0}::{closure#1}::{closure#0}>
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_data_structures/src/sync/parallel.rs:28:9
 106:     0x7f7cbe3fa684 - rustc_data_structures[e95f3e36f9618881]::sync::parallel::enabled::par_for_each_in::<rustc_middle[8414b965ec1e8931]::mir::mono::MonoItem, alloc[3b5cf733b6b27210]::vec::Vec<rustc_middle[8414b965ec1e8931]::mir::mono::MonoItem>, rustc_monomorphize[e9a13ccb3a3d72c]::collector::collect_crate_mono_items::{closure#1}::{closure#0}>::{closure#0}::{closure#1}
                               at /home/matthias/vcs/github/rust_debug_assertions/compiler/rustc_data_structures/src/sync/parallel.rs:186:21
 107:     0x7f7cbe3fa684 - core[aa444211b5f41879]::iter::traits::iterator::Iterator::for_each::call::<rustc_middle[8414b965ec1e8931]::mir::mono::MonoItem, rustc_data_structures[e95f3e36f9618881]::sync::parallel::enabled::par_for_each_in<rustc_middle[8414b965ec1e8931]::mir::mono::MonoItem, alloc[3b5cf733b6b27210]::vec::Vec<rustc_middle[8414b965ec1e8931]::mir::mono::MonoItem>, rustc_monomorphize[e9a13ccb3a3d72c]::collector::collect_crate_mono_items::{closure#1}::{closure#0}>::{closure#0}::{closure#1}>::{closure#0}
                               at /home/matthias/vcs/github/rust_debug_assertions/library/core/src/iter/traits/iterator.rs:855:29
 108:     0x7f7cbe3fa684 - <alloc[3b5cf733b6b27210]::vec::into_iter::IntoIter<rustc_middle[8414b965ec1e8931]::mir::mono::MonoItem> as core[aa444211b5f41879]::iter::traits::iterator::Iterator>::fold::<(), core[aa444211b5f41879]::iter::traits::iterator::Iterator::for_each::call<rustc_middle[8414b965ec1e8931]::mir::mono::MonoItem, rustc_data_structures[e95f3e36f9618881]::sync::parallel::enabled::par_for_each_in<rustc_middle[8414b965ec1e8931]::mir::mono::MonoItem, alloc[3b5cf733b6b27210]::vec::Vec<rustc_middle[8414b965ec1e8931]::mir::mono::MonoItem>, rustc_monomorphize[e9a13ccb3a3d72c]::collector::collect_crate_mono_items::{closure#1}::{closure#0}>::{closure#0}::{closure#1}>::{closure#0}>
                               at /home/matthias/vcs/github/rust_debug_assertions/library/core/src/iter/traits/iterator.rs:2640:21
 109:     0x7f7cbe3fa684 - <alloc[3b5cf733b6b27210]::vec::into_iter::IntoIter<rustc_middle[8414b965ec1e8931]::mir::mono::MonoItem> as core[aa444211b5f41879]::iter::traits::iterator::Iterator>::for_each::<rustc_data_structures[e95f3e36f9618881]::sync::parallel::enabled::par_for_each_in<rustc_middle[8414b965ec1e8931]::mir::mono::MonoItem, alloc[3b5cf733b6b27210]::vec::Vec<rustc_middle[8414b965ec1e8931]::mir::mono::MonoItem>, rustc_monomorphize[e9a13ccb3a3d72c]::collector::collect_crate_mono_items::{closure#1}::{closure#0}>::{closure#0}::{closure#1}>
                               at /home/matthias/vcs/github/rust_debug_assertions/library/core/src/iter/traits/iterator.rs:858:9
<snip>
 205:     0x7f7cbcacb2d3 - <std[1ba472e493b6ecda]::thread::Builder>::spawn_unchecked_::<rustc_interface[8306b4673bc9e9fb]::util::run_in_thread_with_globals<rustc_interface[8306b4673bc9e9fb]::util::run_in_thread_pool_with_globals<rustc_interface[8306b4673bc9e9fb]::interface::run_compiler<core[aa444211b5f41879]::result::Result<(), rustc_span[9066a7c1991c4c44]::ErrorGuaranteed>, rustc_driver_impl[8889ac64fe77a2fe]::run_compiler::{closure#0}>::{closure#0}, core[aa444211b5f41879]::result::Result<(), rustc_span[9066a7c1991c4c44]::ErrorGuaranteed>>::{closure#0}, core[aa444211b5f41879]::result::Result<(), rustc_span[9066a7c1991c4c44]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[aa444211b5f41879]::result::Result<(), rustc_span[9066a7c1991c4c44]::ErrorGuaranteed>>::{closure#1}
                               at /home/matthias/vcs/github/rust_debug_assertions/library/std/src/thread/mod.rs:528:30
 206:     0x7f7cbcacb2d3 - <<std[1ba472e493b6ecda]::thread::Builder>::spawn_unchecked_<rustc_interface[8306b4673bc9e9fb]::util::run_in_thread_with_globals<rustc_interface[8306b4673bc9e9fb]::util::run_in_thread_pool_with_globals<rustc_interface[8306b4673bc9e9fb]::interface::run_compiler<core[aa444211b5f41879]::result::Result<(), rustc_span[9066a7c1991c4c44]::ErrorGuaranteed>, rustc_driver_impl[8889ac64fe77a2fe]::run_compiler::{closure#0}>::{closure#0}, core[aa444211b5f41879]::result::Result<(), rustc_span[9066a7c1991c4c44]::ErrorGuaranteed>>::{closure#0}, core[aa444211b5f41879]::result::Result<(), rustc_span[9066a7c1991c4c44]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[aa444211b5f41879]::result::Result<(), rustc_span[9066a7c1991c4c44]::ErrorGuaranteed>>::{closure#1} as core[aa444211b5f41879]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
                               at /home/matthias/vcs/github/rust_debug_assertions/library/core/src/ops/function.rs:250:5
 207:     0x7f7cb9f6d18c - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h81ab1a37af1954b1
                               at /home/matthias/vcs/github/rust_debug_assertions/library/alloc/src/boxed.rs:2015:9
 208:     0x7f7cb9f6d18c - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h5e05ea3bb7f99950
                               at /home/matthias/vcs/github/rust_debug_assertions/library/alloc/src/boxed.rs:2015:9
 209:     0x7f7cb9f7f115 - std::sys::pal::unix::thread::Thread::new::thread_start::hfa99437ef0507a46
                               at /home/matthias/vcs/github/rust_debug_assertions/library/std/src/sys/pal/unix/thread.rs:108:17
 210:     0x7f7cb9d1f9eb - <unknown>
 211:     0x7f7cb9da37cc - <unknown>
 212:                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: rustc 1.78.0-dev running on x86_64-unknown-linux-gnu

note: compiler flags: -Z print-mono-items=eager -Z polymorphize=on --crate-type lib -Z dump-mir-dir=dir

query stack during panic:
#0 [collect_and_partition_mono_items] collect_and_partition_mono_items
#1 [exported_symbols] collecting exported symbols for crate `0`
end of query stack
warning: 1 warning emitted

[matthiaskrgr]

without debug assertions:

auto-reduced (treereduce-rust):

#![feature(coroutines, coroutine_trait)]

use std::ops::Coroutine;
use std::pin::Pin;
use std::thread;

fn send_over_threads() {
    let mut foo = || yield;
    thread::spawn(move || match Pin::new(&mut foo).resume(()) {
        s => panic!("bad state: {:?}", s),
    })
    .join()
    .unwrap();
}

#[test]
fn send_over_threads() {}

original:

#![feature(coroutines, coroutine_trait)]

use std::ops::{Coroutine, CoroutineState};
use std::pin::Pin;
use std::thread;

fn send_over_threads() {
    let mut foo = || yield;
    thread::spawn(move || match Pin::new(&mut foo).resume(()) {
        s => panic!("bad state: {:?}", s),
    })
    .join()
    .unwrap();
}

#[test]
fn send_over_threads() {}

Version information

rustc 1.78.0-nightly (0d531351e 2024-02-06)
binary: rustc
commit-hash: 0d531351e848ad69a03c704d40985c9003847427
commit-date: 2024-02-06
host: x86_64-unknown-linux-gnu
release: 1.78.0-nightly
LLVM version: 17.0.6

Command:
/home/matthias/.rustup/toolchains/master/bin/rustc -Zprint-mono-items=eager -Zpolymorphize=on --crate-type=lib

Program output

warning: function `send_over_threads` is never used
 --> /tmp/icemaker_global_tempdir.rTwJ9iNSDjnA/rustc_testrunner_tmpdir_reporting.CrUunUkus4Tu/mvce.rs:7:4
  |
7 | fn send_over_threads() {
  |    ^^^^^^^^^^^^^^^^^
  |
  = note: `#[warn(dead_code)]` on by default

error: internal compiler error: compiler/rustc_middle/src/ty/sty.rs:614:18: coroutine args missing synthetics

thread 'rustc' panicked at /rustc/0d531351e848ad69a03c704d40985c9003847427/compiler/rustc_errors/src/lib.rs:922:30:
Box<dyn Any>
stack backtrace:
   0:     0x7f14c6993dd6 - std::backtrace_rs::backtrace::libunwind::trace::hfdae62e8e22e6f1a
                               at /rustc/0d531351e848ad69a03c704d40985c9003847427/library/std/src/../../backtrace/src/backtrace/libunwind.rs:104:5
   1:     0x7f14c6993dd6 - std::backtrace_rs::backtrace::trace_unsynchronized::he505abab68a6512a
                               at /rustc/0d531351e848ad69a03c704d40985c9003847427/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f14c6993dd6 - std::sys_common::backtrace::_print_fmt::h2058e6ceaf7986ec
                               at /rustc/0d531351e848ad69a03c704d40985c9003847427/library/std/src/sys_common/backtrace.rs:68:5
   3:     0x7f14c6993dd6 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h88fb1ebd9d7ae9fa
                               at /rustc/0d531351e848ad69a03c704d40985c9003847427/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f14c69e6830 - core::fmt::rt::Argument::fmt::heef523905221546b
                               at /rustc/0d531351e848ad69a03c704d40985c9003847427/library/core/src/fmt/rt.rs:142:9
   5:     0x7f14c69e6830 - core::fmt::write::h717ed8a802e496ec
                               at /rustc/0d531351e848ad69a03c704d40985c9003847427/library/core/src/fmt/mod.rs:1120:17
   6:     0x7f14c69876df - std::io::Write::write_fmt::h0a7b5a6fbe2edfa0
                               at /rustc/0d531351e848ad69a03c704d40985c9003847427/library/std/src/io/mod.rs:1854:15
   7:     0x7f14c6993bb4 - std::sys_common::backtrace::_print::h50186d622834a784
                               at /rustc/0d531351e848ad69a03c704d40985c9003847427/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7f14c6993bb4 - std::sys_common::backtrace::print::h73bfab4cea7bd688
                               at /rustc/0d531351e848ad69a03c704d40985c9003847427/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7f14c6996947 - std::panicking::default_hook::{{closure}}::ha091dd49dc1987ee
  10:     0x7f14c69966a9 - std::panicking::default_hook::ha0896466afb51dd5
                               at /rustc/0d531351e848ad69a03c704d40985c9003847427/library/std/src/panicking.rs:292:9
  11:     0x7f14c374535c - std[e2dd8f09a6979f5]::panicking::update_hook::<alloc[dfc499d75d84c89b]::boxed::Box<rustc_driver_impl[b4197ccbff761024]::install_ice_hook::{closure#0}>>::{closure#0}
  12:     0x7f14c6997096 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h1f2e1daf0de28c05
                               at /rustc/0d531351e848ad69a03c704d40985c9003847427/library/alloc/src/boxed.rs:2029:9
  13:     0x7f14c6997096 - std::panicking::rust_panic_with_hook::h52f243af5da102d3
                               at /rustc/0d531351e848ad69a03c704d40985c9003847427/library/std/src/panicking.rs:785:13
  14:     0x7f14c3776db4 - std[e2dd8f09a6979f5]::panicking::begin_panic::<rustc_errors[6474280b2ffa63e5]::ExplicitBug>::{closure#0}
  15:     0x7f14c37734a6 - std[e2dd8f09a6979f5]::sys_common::backtrace::__rust_end_short_backtrace::<std[e2dd8f09a6979f5]::panicking::begin_panic<rustc_errors[6474280b2ffa63e5]::ExplicitBug>::{closure#0}, !>
  16:     0x7f14c376ebd6 - std[e2dd8f09a6979f5]::panicking::begin_panic::<rustc_errors[6474280b2ffa63e5]::ExplicitBug>
  17:     0x7f14c3782931 - <rustc_errors[6474280b2ffa63e5]::diagnostic_builder::BugAbort as rustc_errors[6474280b2ffa63e5]::diagnostic_builder::EmissionGuarantee>::emit_producing_guarantee
  18:     0x7f14c3b36a3e - <rustc_errors[6474280b2ffa63e5]::DiagCtxt>::bug::<alloc[dfc499d75d84c89b]::string::String>
  19:     0x7f14c3bd21eb - rustc_middle[3665694cbc533b51]::util::bug::opt_span_bug_fmt::<rustc_span[6737e1c60a64ddff]::span_encoding::Span>::{closure#0}
  20:     0x7f14c3bb97aa - rustc_middle[3665694cbc533b51]::ty::context::tls::with_opt::<rustc_middle[3665694cbc533b51]::util::bug::opt_span_bug_fmt<rustc_span[6737e1c60a64ddff]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  21:     0x7f14c3bb9648 - rustc_middle[3665694cbc533b51]::ty::context::tls::with_context_opt::<rustc_middle[3665694cbc533b51]::ty::context::tls::with_opt<rustc_middle[3665694cbc533b51]::util::bug::opt_span_bug_fmt<rustc_span[6737e1c60a64ddff]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  22:     0x7f14c1b65c60 - rustc_middle[3665694cbc533b51]::util::bug::bug_fmt
  23:     0x7f14c3bcf315 - <rustc_middle[3665694cbc533b51]::ty::sty::CoroutineArgs>::split
  24:     0x7f14c18bc731 - <rustc_middle[3665694cbc533b51]::ty::context::CtxtInterners>::intern_ty
  25:     0x7f14c3bc8a40 - <rustc_middle[3665694cbc533b51]::ty::instance::polymorphize::PolymorphizationFolder as rustc_type_ir[7499020ed232ab1c]::fold::TypeFolder<rustc_middle[3665694cbc533b51]::ty::context::TyCtxt>>::fold_ty
  26:     0x7f14c3bc70c0 - <&rustc_middle[3665694cbc533b51]::ty::list::List<rustc_middle[3665694cbc533b51]::ty::Ty> as rustc_type_ir[7499020ed232ab1c]::fold::TypeFoldable<rustc_middle[3665694cbc533b51]::ty::context::TyCtxt>>::try_fold_with::<rustc_middle[3665694cbc533b51]::ty::instance::polymorphize::PolymorphizationFolder>
  27:     0x7f14c3bc8b38 - <rustc_middle[3665694cbc533b51]::ty::instance::polymorphize::PolymorphizationFolder as rustc_type_ir[7499020ed232ab1c]::fold::TypeFolder<rustc_middle[3665694cbc533b51]::ty::context::TyCtxt>>::fold_ty
  28:     0x7f14c3bc417c - <rustc_middle[3665694cbc533b51]::ty::list::List<rustc_middle[3665694cbc533b51]::ty::generic_args::GenericArg>>::fill_item::<rustc_middle[3665694cbc533b51]::ty::instance::polymorphize::{closure#1}>
  29:     0x7f14c3bc87f5 - rustc_middle[3665694cbc533b51]::ty::instance::polymorphize
  30:     0x7f14c3bc8a0a - <rustc_middle[3665694cbc533b51]::ty::instance::polymorphize::PolymorphizationFolder as rustc_type_ir[7499020ed232ab1c]::fold::TypeFolder<rustc_middle[3665694cbc533b51]::ty::context::TyCtxt>>::fold_ty
  31:     0x7f14c3bc524d - <&rustc_middle[3665694cbc533b51]::ty::list::List<rustc_middle[3665694cbc533b51]::ty::generic_args::GenericArg> as rustc_type_ir[7499020ed232ab1c]::fold::TypeFoldable<rustc_middle[3665694cbc533b51]::ty::context::TyCtxt>>::try_fold_with::<rustc_middle[3665694cbc533b51]::ty::instance::polymorphize::PolymorphizationFolder>
  32:     0x7f14c3bc8aa5 - <rustc_middle[3665694cbc533b51]::ty::instance::polymorphize::PolymorphizationFolder as rustc_type_ir[7499020ed232ab1c]::fold::TypeFolder<rustc_middle[3665694cbc533b51]::ty::context::TyCtxt>>::fold_ty
  33:     0x7f14c3bc70c0 - <&rustc_middle[3665694cbc533b51]::ty::list::List<rustc_middle[3665694cbc533b51]::ty::Ty> as rustc_type_ir[7499020ed232ab1c]::fold::TypeFoldable<rustc_middle[3665694cbc533b51]::ty::context::TyCtxt>>::try_fold_with::<rustc_middle[3665694cbc533b51]::ty::instance::polymorphize::PolymorphizationFolder>
  34:     0x7f14c3bc8b38 - <rustc_middle[3665694cbc533b51]::ty::instance::polymorphize::PolymorphizationFolder as rustc_type_ir[7499020ed232ab1c]::fold::TypeFolder<rustc_middle[3665694cbc533b51]::ty::context::TyCtxt>>::fold_ty
  35:     0x7f14c3bc417c - <rustc_middle[3665694cbc533b51]::ty::list::List<rustc_middle[3665694cbc533b51]::ty::generic_args::GenericArg>>::fill_item::<rustc_middle[3665694cbc533b51]::ty::instance::polymorphize::{closure#1}>
  36:     0x7f14c3bc87f5 - rustc_middle[3665694cbc533b51]::ty::instance::polymorphize
  37:     0x7f14c2715f00 - rustc_monomorphize[b8630da2a4929460]::collector::collect_items_rec::{closure#0}
  38:     0x7f14c58a3c23 - rustc_monomorphize[b8630da2a4929460]::collector::collect_items_rec
  39:     0x7f14c58a3f77 - rustc_monomorphize[b8630da2a4929460]::collector::collect_items_rec
  40:     0x7f14c58a3f77 - rustc_monomorphize[b8630da2a4929460]::collector::collect_items_rec
  41:     0x7f14c58a3f77 - rustc_monomorphize[b8630da2a4929460]::collector::collect_items_rec
  42:     0x7f14c58a3f77 - rustc_monomorphize[b8630da2a4929460]::collector::collect_items_rec
  43:     0x7f14c589f33b - rustc_monomorphize[b8630da2a4929460]::partitioning::collect_and_partition_mono_items
  44:     0x7f14c589e996 - rustc_query_impl[ab8ae9d653566c7b]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[ab8ae9d653566c7b]::query_impl::collect_and_partition_mono_items::dynamic_query::{closure#2}::{closure#0}, rustc_middle[3665694cbc533b51]::query::erase::Erased<[u8; 24usize]>>
  45:     0x7f14c589e967 - <rustc_query_impl[ab8ae9d653566c7b]::query_impl::collect_and_partition_mono_items::dynamic_query::{closure#2} as core[2976feabee4c73dd]::ops::function::FnOnce<(rustc_middle[3665694cbc533b51]::ty::context::TyCtxt, ())>>::call_once
  46:     0x7f14c589dd07 - rustc_query_system[197d7338a8b871ba]::query::plumbing::try_execute_query::<rustc_query_impl[ab8ae9d653566c7b]::DynamicConfig<rustc_query_system[197d7338a8b871ba]::query::caches::SingleCache<rustc_middle[3665694cbc533b51]::query::erase::Erased<[u8; 24usize]>>, false, false, false>, rustc_query_impl[ab8ae9d653566c7b]::plumbing::QueryCtxt, false>
  47:     0x7f14c589da09 - rustc_query_impl[ab8ae9d653566c7b]::query_impl::collect_and_partition_mono_items::get_query_non_incr::__rust_end_short_backtrace
  48:     0x7f14c555e7c0 - rustc_codegen_ssa[f18a1fc9d2423288]::back::symbol_export::exported_symbols_provider_local
  49:     0x7f14c4bdd3e5 - rustc_query_impl[ab8ae9d653566c7b]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[ab8ae9d653566c7b]::query_impl::exported_symbols::dynamic_query::{closure#2}::{closure#0}, rustc_middle[3665694cbc533b51]::query::erase::Erased<[u8; 16usize]>>
  50:     0x7f14c4bdd39d - <rustc_query_impl[ab8ae9d653566c7b]::query_impl::exported_symbols::dynamic_query::{closure#2} as core[2976feabee4c73dd]::ops::function::FnOnce<(rustc_middle[3665694cbc533b51]::ty::context::TyCtxt, rustc_span[6737e1c60a64ddff]::def_id::CrateNum)>>::call_once
  51:     0x7f14c55dcc94 - rustc_query_system[197d7338a8b871ba]::query::plumbing::try_execute_query::<rustc_query_impl[ab8ae9d653566c7b]::DynamicConfig<rustc_query_system[197d7338a8b871ba]::query::caches::VecCache<rustc_span[6737e1c60a64ddff]::def_id::CrateNum, rustc_middle[3665694cbc533b51]::query::erase::Erased<[u8; 16usize]>>, false, false, false>, rustc_query_impl[ab8ae9d653566c7b]::plumbing::QueryCtxt, false>
  52:     0x7f14c55dc6e3 - rustc_query_impl[ab8ae9d653566c7b]::query_impl::exported_symbols::get_query_non_incr::__rust_end_short_backtrace
  53:     0x7f14c55dc78d - rustc_middle[3665694cbc533b51]::query::plumbing::query_get_at::<rustc_query_system[197d7338a8b871ba]::query::caches::VecCache<rustc_span[6737e1c60a64ddff]::def_id::CrateNum, rustc_middle[3665694cbc533b51]::query::erase::Erased<[u8; 16usize]>>>
  54:     0x7f14c59f0df5 - <rustc_metadata[6baf755ad2313115]::rmeta::encoder::EncodeContext>::encode_crate_root
  55:     0x7f14c5a1bc7b - rustc_metadata[6baf755ad2313115]::rmeta::encoder::encode_metadata
  56:     0x7f14c5a1a2a8 - rustc_metadata[6baf755ad2313115]::fs::encode_and_write_metadata
  57:     0x7f14c59a27c3 - rustc_interface[f913384edd7e9cbf]::passes::start_codegen
  58:     0x7f14c59a1fb0 - <rustc_interface[f913384edd7e9cbf]::queries::Queries>::codegen_and_build_linker
  59:     0x7f14c578708c - rustc_interface[f913384edd7e9cbf]::interface::run_compiler::<core[2976feabee4c73dd]::result::Result<(), rustc_span[6737e1c60a64ddff]::ErrorGuaranteed>, rustc_driver_impl[b4197ccbff761024]::run_compiler::{closure#0}>::{closure#0}
  60:     0x7f14c5390a86 - std[e2dd8f09a6979f5]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[f913384edd7e9cbf]::util::run_in_thread_with_globals<rustc_interface[f913384edd7e9cbf]::util::run_in_thread_pool_with_globals<rustc_interface[f913384edd7e9cbf]::interface::run_compiler<core[2976feabee4c73dd]::result::Result<(), rustc_span[6737e1c60a64ddff]::ErrorGuaranteed>, rustc_driver_impl[b4197ccbff761024]::run_compiler::{closure#0}>::{closure#0}, core[2976feabee4c73dd]::result::Result<(), rustc_span[6737e1c60a64ddff]::ErrorGuaranteed>>::{closure#0}, core[2976feabee4c73dd]::result::Result<(), rustc_span[6737e1c60a64ddff]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[2976feabee4c73dd]::result::Result<(), rustc_span[6737e1c60a64ddff]::ErrorGuaranteed>>
  61:     0x7f14c53908b3 - <<std[e2dd8f09a6979f5]::thread::Builder>::spawn_unchecked_<rustc_interface[f913384edd7e9cbf]::util::run_in_thread_with_globals<rustc_interface[f913384edd7e9cbf]::util::run_in_thread_pool_with_globals<rustc_interface[f913384edd7e9cbf]::interface::run_compiler<core[2976feabee4c73dd]::result::Result<(), rustc_span[6737e1c60a64ddff]::ErrorGuaranteed>, rustc_driver_impl[b4197ccbff761024]::run_compiler::{closure#0}>::{closure#0}, core[2976feabee4c73dd]::result::Result<(), rustc_span[6737e1c60a64ddff]::ErrorGuaranteed>>::{closure#0}, core[2976feabee4c73dd]::result::Result<(), rustc_span[6737e1c60a64ddff]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[2976feabee4c73dd]::result::Result<(), rustc_span[6737e1c60a64ddff]::ErrorGuaranteed>>::{closure#1} as core[2976feabee4c73dd]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  62:     0x7f14c69a0735 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h91ee709be90055be
                               at /rustc/0d531351e848ad69a03c704d40985c9003847427/library/alloc/src/boxed.rs:2015:9
  63:     0x7f14c69a0735 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h8114a27eba7072b8
                               at /rustc/0d531351e848ad69a03c704d40985c9003847427/library/alloc/src/boxed.rs:2015:9
  64:     0x7f14c69a0735 - std::sys::pal::unix::thread::Thread::new::thread_start::hd02f1d4a31662427
                               at /rustc/0d531351e848ad69a03c704d40985c9003847427/library/std/src/sys/pal/unix/thread.rs:108:17
  65:     0x7f14c08749eb - <unknown>
  66:     0x7f14c08f87cc - <unknown>
  67:                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: rustc 1.78.0-nightly (0d531351e 2024-02-06) running on x86_64-unknown-linux-gnu

note: compiler flags: -Z print-mono-items=eager -Z polymorphize=on --crate-type lib -Z dump-mir-dir=dir

query stack during panic:
#0 [collect_and_partition_mono_items] collect_and_partition_mono_items
#1 [exported_symbols] collecting exported symbols for crate `0`
end of query stack
error: aborting due to 1 previous error; 1 warning emitted

[matthiaskrgr]

Regression in nightly-2024-02-07
#120361 cc @compiler-errors