ICE: `compiler/rustc_const_eval/src/util/compare_types.rs` 

### Code
`rustc -Zvalidate-mir`
```Rust
fn main() {
    let _ = Some(())
        .into_iter()
        .flat_map(|_| Some(()).into_iter().flat_map(func));
}

fn func(_: ()) -> impl Iterator<Item = ()> {
    Some(()).into_iter().flat_map(|_| vec![])
}
```


### Meta


`rustc --version --verbose`:
```
rustc 1.73.0-nightly (0d95f9132 2023-07-26)
binary: rustc
commit-hash: 0d95f9132909ae7c5f2456748d0ffd1c3ba4a8e8
commit-date: 2023-07-26
host: x86_64-unknown-linux-gnu
release: 1.73.0-nightly
LLVM version: 16.0.5
```

### Error output

```
<output>
```


<details><summary><strong>Backtrace</strong></summary>
<p>

```
error: internal compiler error: compiler/rustc_const_eval/src/util/compare_types.rs:60:9: FlatMap<std::option::IntoIter<()>, Vec<()>, [closure@main.rs:12:35: 12:38]>, FlatMap<std::option::IntoIter<()>, Vec<()>, [closure@main.rs:12:35: 12:38]>

thread 'rustc' panicked at 'Box<dyn Any>', /rustc/3e11b223d7ad9836babf2d531b0ca6d13ff3f065/compiler/rustc_errors/src/lib.rs:984:33
stack backtrace:
   0:     0x7f798fb8afc1 - std::backtrace_rs::backtrace::libunwind::trace::h34b52eab641761be
                               at /rustc/3e11b223d7ad9836babf2d531b0ca6d13ff3f065/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7f798fb8afc1 - std::backtrace_rs::backtrace::trace_unsynchronized::h997dbb2011b5cf9e
                               at /rustc/3e11b223d7ad9836babf2d531b0ca6d13ff3f065/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f798fb8afc1 - std::sys_common::backtrace::_print_fmt::h27d98da531dc62f2
                               at /rustc/3e11b223d7ad9836babf2d531b0ca6d13ff3f065/library/std/src/sys_common/backtrace.rs:65:5
   3:     0x7f798fb8afc1 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h6ff5c5befde606a8
                               at /rustc/3e11b223d7ad9836babf2d531b0ca6d13ff3f065/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f798fbf149c - core::fmt::rt::Argument::fmt::h0b78b9d7ed8562d3
                               at /rustc/3e11b223d7ad9836babf2d531b0ca6d13ff3f065/library/core/src/fmt/rt.rs:138:9
   5:     0x7f798fbf149c - core::fmt::write::h941c48da304d4679
                               at /rustc/3e11b223d7ad9836babf2d531b0ca6d13ff3f065/library/core/src/fmt/mod.rs:1094:21
   6:     0x7f798fb7d7ae - std::io::Write::write_fmt::h7504291052467c2e
                               at /rustc/3e11b223d7ad9836babf2d531b0ca6d13ff3f065/library/std/src/io/mod.rs:1714:15
   7:     0x7f798fb8add5 - std::sys_common::backtrace::_print::haa405176d86e9509
                               at /rustc/3e11b223d7ad9836babf2d531b0ca6d13ff3f065/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7f798fb8add5 - std::sys_common::backtrace::print::h8cb930c9662fcbe5
                               at /rustc/3e11b223d7ad9836babf2d531b0ca6d13ff3f065/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7f798fb8de2a - std::panicking::panic_hook_with_disk_dump::{{closure}}::h69be33a261466836
                               at /rustc/3e11b223d7ad9836babf2d531b0ca6d13ff3f065/library/std/src/panicking.rs:278:22
  10:     0x7f798fb8dac3 - std::panicking::panic_hook_with_disk_dump::h9c509d5bcf8e910f
                               at /rustc/3e11b223d7ad9836babf2d531b0ca6d13ff3f065/library/std/src/panicking.rs:312:9
  11:     0x7f798e9912b9 - rustc_driver_impl[d71bbe132f208e76]::install_ice_hook::{closure#0}
  12:     0x7f798fb8e6d0 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h96e6c64033b86051
                               at /rustc/3e11b223d7ad9836babf2d531b0ca6d13ff3f065/library/alloc/src/boxed.rs:2021:9
  13:     0x7f798fb8e6d0 - std::panicking::rust_panic_with_hook::hde8dca79465834eb
                               at /rustc/3e11b223d7ad9836babf2d531b0ca6d13ff3f065/library/std/src/panicking.rs:733:13
  14:     0x7f798e9038e1 - std[5a172474299c65ce]::panicking::begin_panic::<rustc_errors[12aaae0854151d3b]::ExplicitBug>::{closure#0}
  15:     0x7f798e902a66 - std[5a172474299c65ce]::sys_common::backtrace::__rust_end_short_backtrace::<std[5a172474299c65ce]::panicking::begin_panic<rustc_errors[12aaae0854151d3b]::ExplicitBug>::{closure#0}, !>
  16:     0x7f798e9008a6 - std[5a172474299c65ce]::panicking::begin_panic::<rustc_errors[12aaae0854151d3b]::ExplicitBug>
  17:     0x7f798e95ecae - <rustc_errors[12aaae0854151d3b]::HandlerInner>::span_bug::<rustc_span[1b6d8bb2568b90bc]::span_encoding::Span, alloc[8fd9ca7cb32eafa0]::string::String>
  18:     0x7f798e9592af - <rustc_errors[12aaae0854151d3b]::Handler>::span_bug::<rustc_span[1b6d8bb2568b90bc]::span_encoding::Span, alloc[8fd9ca7cb32eafa0]::string::String>
  19:     0x7f798e961cbd - rustc_middle[551ac73590daa449]::util::bug::opt_span_bug_fmt::<rustc_span[1b6d8bb2568b90bc]::span_encoding::Span>::{closure#0}
  20:     0x7f798e961cea - rustc_middle[551ac73590daa449]::ty::context::tls::with_opt::<rustc_middle[551ac73590daa449]::util::bug::opt_span_bug_fmt<rustc_span[1b6d8bb2568b90bc]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  21:     0x7f798e961ab8 - rustc_middle[551ac73590daa449]::ty::context::tls::with_context_opt::<rustc_middle[551ac73590daa449]::ty::context::tls::with_opt<rustc_middle[551ac73590daa449]::util::bug::opt_span_bug_fmt<rustc_span[1b6d8bb2568b90bc]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  22:     0x7f798ce79784 - rustc_middle[551ac73590daa449]::util::bug::span_bug_fmt::<rustc_span[1b6d8bb2568b90bc]::span_encoding::Span>
  23:     0x7f798d5a22ca - rustc_const_eval[b42dcae41b46c403]::util::compare_types::is_subtype
  24:     0x7f798d70efcf - rustc_const_eval[b42dcae41b46c403]::transform::validate::validate_types
  25:     0x7f798d6f60fc - <rustc_const_eval[b42dcae41b46c403]::transform::validate::Validator as rustc_middle[551ac73590daa449]::mir::MirPass>::run_pass
  26:     0x7f798f172e10 - rustc_mir_transform[f001fc04107e9b9e]::pass_manager::validate_body
  27:     0x7f798d6f1d19 - rustc_mir_transform[f001fc04107e9b9e]::pass_manager::run_passes
  28:     0x7f798dddc250 - rustc_mir_transform[f001fc04107e9b9e]::shim::make_shim
  29:     0x7f798d64682f - rustc_query_impl[af1ff291a4c4850a]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[af1ff291a4c4850a]::query_impl::mir_shims::dynamic_query::{closure#2}::{closure#0}, rustc_middle[551ac73590daa449]::query::erase::Erased<[u8; 8usize]>>
  30:     0x7f798d6467ec - <rustc_query_impl[af1ff291a4c4850a]::query_impl::mir_shims::dynamic_query::{closure#2} as core[5a22fc829b0f94e2]::ops::function::FnOnce<(rustc_middle[551ac73590daa449]::ty::context::TyCtxt, rustc_middle[551ac73590daa449]::ty::instance::InstanceDef)>>::call_once
  31:     0x7f798d6eaa70 - rustc_query_system[1c34060796548d21]::query::plumbing::try_execute_query::<rustc_query_impl[af1ff291a4c4850a]::DynamicConfig<rustc_query_system[1c34060796548d21]::query::caches::DefaultCache<rustc_middle[551ac73590daa449]::ty::instance::InstanceDef, rustc_middle[551ac73590daa449]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[af1ff291a4c4850a]::plumbing::QueryCtxt, false>
  32:     0x7f798d6ea783 - rustc_query_impl[af1ff291a4c4850a]::query_impl::mir_shims::get_query_non_incr::__rust_end_short_backtrace
  33:     0x7f798cfb37dc - <rustc_middle[551ac73590daa449]::ty::context::TyCtxt>::instance_mir
  34:     0x7f798ca7d376 - rustc_monomorphize[dbdec64131a9e474]::collector::collect_used_items
  35:     0x7f798ca79d45 - rustc_monomorphize[dbdec64131a9e474]::collector::collect_items_rec
  36:     0x7f798ca7a69c - rustc_monomorphize[dbdec64131a9e474]::collector::collect_items_rec
  37:     0x7f798df37c70 - rustc_data_structures[fb03cc5bd7e189d4]::sync::par_for_each_in::<alloc[8fd9ca7cb32eafa0]::vec::Vec<rustc_middle[551ac73590daa449]::mir::mono::MonoItem>, rustc_monomorphize[dbdec64131a9e474]::collector::collect_crate_mono_items::{closure#1}::{closure#0}>
  38:     0x7f798df37569 - <rustc_session[bd2c67ddbe213558]::session::Session>::time::<(), rustc_monomorphize[dbdec64131a9e474]::collector::collect_crate_mono_items::{closure#1}>
  39:     0x7f798df371c8 - rustc_monomorphize[dbdec64131a9e474]::collector::collect_crate_mono_items
  40:     0x7f798df357a7 - rustc_monomorphize[dbdec64131a9e474]::partitioning::collect_and_partition_mono_items
  41:     0x7f798df8ea19 - rustc_query_impl[af1ff291a4c4850a]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[af1ff291a4c4850a]::query_impl::collect_and_partition_mono_items::dynamic_query::{closure#2}::{closure#0}, rustc_middle[551ac73590daa449]::query::erase::Erased<[u8; 24usize]>>
  42:     0x7f798df8e9eb - <rustc_query_impl[af1ff291a4c4850a]::query_impl::collect_and_partition_mono_items::dynamic_query::{closure#2} as core[5a22fc829b0f94e2]::ops::function::FnOnce<(rustc_middle[551ac73590daa449]::ty::context::TyCtxt, ())>>::call_once
  43:     0x7f798e07552c - rustc_query_system[1c34060796548d21]::query::plumbing::try_execute_query::<rustc_query_impl[af1ff291a4c4850a]::DynamicConfig<rustc_query_system[1c34060796548d21]::query::caches::SingleCache<rustc_middle[551ac73590daa449]::query::erase::Erased<[u8; 24usize]>>, false, false, false>, rustc_query_impl[af1ff291a4c4850a]::plumbing::QueryCtxt, false>
  44:     0x7f798e30adb8 - rustc_query_impl[af1ff291a4c4850a]::query_impl::collect_and_partition_mono_items::get_query_non_incr::__rust_end_short_backtrace
  45:     0x7f798da6f5e6 - rustc_codegen_ssa[68214238dbe7e393]::base::codegen_crate::<rustc_codegen_llvm[63aadcf8e14e7030]::LlvmCodegenBackend>
  46:     0x7f798da6f3cb - <rustc_codegen_llvm[63aadcf8e14e7030]::LlvmCodegenBackend as rustc_codegen_ssa[68214238dbe7e393]::traits::backend::CodegenBackend>::codegen_crate
  47:     0x7f798dbd8a32 - <rustc_session[bd2c67ddbe213558]::session::Session>::time::<alloc[8fd9ca7cb32eafa0]::boxed::Box<dyn core[5a22fc829b0f94e2]::any::Any>, rustc_interface[5284e2ff6730c6a0]::passes::start_codegen::{closure#0}>
  48:     0x7f798dbd85ab - rustc_interface[5284e2ff6730c6a0]::passes::start_codegen
  49:     0x7f798dbd323a - <rustc_middle[551ac73590daa449]::ty::context::GlobalCtxt>::enter::<<rustc_interface[5284e2ff6730c6a0]::queries::Queries>::ongoing_codegen::{closure#0}, core[5a22fc829b0f94e2]::result::Result<alloc[8fd9ca7cb32eafa0]::boxed::Box<dyn core[5a22fc829b0f94e2]::any::Any>, rustc_span[1b6d8bb2568b90bc]::ErrorGuaranteed>>
  50:     0x7f798dbd2273 - <rustc_interface[5284e2ff6730c6a0]::interface::Compiler>::enter::<rustc_driver_impl[d71bbe132f208e76]::run_compiler::{closure#1}::{closure#2}, core[5a22fc829b0f94e2]::result::Result<core[5a22fc829b0f94e2]::option::Option<rustc_interface[5284e2ff6730c6a0]::queries::Linker>, rustc_span[1b6d8bb2568b90bc]::ErrorGuaranteed>>
  51:     0x7f798dbcb2b8 - std[5a172474299c65ce]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[5284e2ff6730c6a0]::util::run_in_thread_pool_with_globals<rustc_interface[5284e2ff6730c6a0]::interface::run_compiler<core[5a22fc829b0f94e2]::result::Result<(), rustc_span[1b6d8bb2568b90bc]::ErrorGuaranteed>, rustc_driver_impl[d71bbe132f208e76]::run_compiler::{closure#1}>::{closure#0}, core[5a22fc829b0f94e2]::result::Result<(), rustc_span[1b6d8bb2568b90bc]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[5a22fc829b0f94e2]::result::Result<(), rustc_span[1b6d8bb2568b90bc]::ErrorGuaranteed>>
  52:     0x7f798dbcaa3e - <<std[5a172474299c65ce]::thread::Builder>::spawn_unchecked_<rustc_interface[5284e2ff6730c6a0]::util::run_in_thread_pool_with_globals<rustc_interface[5284e2ff6730c6a0]::interface::run_compiler<core[5a22fc829b0f94e2]::result::Result<(), rustc_span[1b6d8bb2568b90bc]::ErrorGuaranteed>, rustc_driver_impl[d71bbe132f208e76]::run_compiler::{closure#1}>::{closure#0}, core[5a22fc829b0f94e2]::result::Result<(), rustc_span[1b6d8bb2568b90bc]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[5a22fc829b0f94e2]::result::Result<(), rustc_span[1b6d8bb2568b90bc]::ErrorGuaranteed>>::{closure#1} as core[5a22fc829b0f94e2]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  53:     0x7f798fb98dc5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hcc1b1a287409c317
                               at /rustc/3e11b223d7ad9836babf2d531b0ca6d13ff3f065/library/alloc/src/boxed.rs:2007:9
  54:     0x7f798fb98dc5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h64035a7c0604b910
                               at /rustc/3e11b223d7ad9836babf2d531b0ca6d13ff3f065/library/alloc/src/boxed.rs:2007:9
  55:     0x7f798fb98dc5 - std::sys::unix::thread::Thread::new::thread_start::h79af870cb7bf2b35
                               at /rustc/3e11b223d7ad9836babf2d531b0ca6d13ff3f065/library/std/src/sys/unix/thread.rs:108:17
  56:     0x7f798b69d44b - <unknown>
  57:     0x7f798b720e40 - <unknown>
  58:                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 attach the file at `/tmp/F/src/rustc-ice-2023-07-27T07:37:57.570831686Z-951469.txt` to your bug report

note: compiler flags: -Z validate-mir

query stack during panic:
#0 [mir_shims] generating MIR shim for `core::ptr::drop_in_place`
#1 [collect_and_partition_mono_items] collect_and_partition_mono_items
end of query stack
error: aborting due to previous error
```

</p>
</details>

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ICE: `compiler/rustc_const_eval/src/util/compare_types.rs` #114121

matthiaskrgr
openedon Jul 27, 2023

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ICE: compiler/rustc_const_eval/src/util/compare_types.rs #114121

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matthiaskrgropenedon Jul 27, 2023