ICE: Failed not normalize Closure/Coroutine

auto-reduced (treereduce-rust):

//@compile-flags: --edition=2024 -Zvalidate-mir
fn invalid_future() -> impl Future {
    create_complex_future()
}

fn create_complex_future() -> impl Future {
    create_complex_future()
}

fn create_complex_future() -> impl Future {
    async { &|| async { async { &|| async { invalid_future().await } } } }
}

original:

//@compile-flags: --edition=2024 (or 2021)
fn invalid_future() -> impl Future {
    create_complex_future()
}

fn create_complex_future() -> impl Future<Output = impl ReturnsSend> {
    create_complex_future()
}

fn coerce_impl_trait() -> impl Future<Output = impl Send> {
    invalid_future()
}

trait ReturnsSend {}

impl<F, R> ReturnsSend for F
where
    F: Fn() -> R,
    R: Send,
{
}

fn create_complex_future() -> impl Future<Output = impl ReturnsSend> {
    async { &|| async {
    async { &|| async { invalid_future().await } }
} }
}

Version information

rustc 1.93.0-nightly (c90bcb957 2025-11-06)
binary: rustc
commit-hash: c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38
commit-date: 2025-11-06
host: x86_64-unknown-linux-gnu
release: 1.93.0-nightly
LLVM version: 21.1.3

Possibly related line of code:

rust/compiler/rustc_middle/src/ty/normalize_erasing_regions.rs

Lines 165 to 177 in c90bcb9

    
               fn normalize_generic_arg_after_erasing_regions( 
        
                   &self, 
        
                   arg: ty::GenericArg<'tcx>, 
        
               ) -> ty::GenericArg<'tcx> { 
        
                   let arg = self.typing_env.as_query_input(arg); 
        
                   self.tcx.try_normalize_generic_arg_after_erasing_regions(arg).unwrap_or_else(|_| { 
        
                       bug!( 
        
                           "Failed to normalize {:?} in typing_env={:?}, \ 
        
                           maybe try to call `try_normalize_erasing_regions` instead", 
        
                           arg.value, 
        
                           self.typing_env, 
        
                       ) 
        
                   })

Command:
/home/matthias/.rustup/toolchains/master/bin/rustc --edition=2024 -Zvalidate-mir

Program output

error[E0428]: the name `create_complex_future` is defined multiple times
 --> /tmp/icemaker_global_tempdir.zD8pQUt7PVI8/rustc_testrunner_tmpdir_reporting.B8v7xT99ixtn/mvce.rs:9:1
  |
5 | fn create_complex_future() -> impl Future {
  | ----------------------------------------- previous definition of the value `create_complex_future` here
...
9 | fn create_complex_future() -> impl Future {
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `create_complex_future` redefined here
  |
  = note: `create_complex_future` must be defined only once in the value namespace of this module

error[E0601]: `main` function not found in crate `mvce`
  --> /tmp/icemaker_global_tempdir.zD8pQUt7PVI8/rustc_testrunner_tmpdir_reporting.B8v7xT99ixtn/mvce.rs:11:2
   |
11 | }
   |  ^ consider adding a `main` function to `/tmp/icemaker_global_tempdir.zD8pQUt7PVI8/rustc_testrunner_tmpdir_reporting.B8v7xT99ixtn/mvce.rs`

warning: function cannot return without recursing
 --> /tmp/icemaker_global_tempdir.zD8pQUt7PVI8/rustc_testrunner_tmpdir_reporting.B8v7xT99ixtn/mvce.rs:5:1
  |
5 | fn create_complex_future() -> impl Future {
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot return without recursing
6 |     create_complex_future()
  |     ----------------------- recursive call site
  |
  = help: a `loop` may express intention better if this is on purpose
  = note: `#[warn(unconditional_recursion)]` on by default

error[E0277]: `()` is not a future
 --> /tmp/icemaker_global_tempdir.zD8pQUt7PVI8/rustc_testrunner_tmpdir_reporting.B8v7xT99ixtn/mvce.rs:5:31
  |
5 | fn create_complex_future() -> impl Future {
  |                               ^^^^^^^^^^^ `()` is not a future
  |
  = help: the trait `Future` is not implemented for `()`
note: required by a bound in an opaque type
 --> /tmp/icemaker_global_tempdir.zD8pQUt7PVI8/rustc_testrunner_tmpdir_reporting.B8v7xT99ixtn/mvce.rs:5:36
  |
5 | fn create_complex_future() -> impl Future {
  |                                    ^^^^^^

error: internal compiler error: compiler/rustc_middle/src/ty/normalize_erasing_regions.rs:171:13: Failed to normalize &'{erased} Closure(DefId(0:10 ~ mvce[8a9d]::create_complex_future#1::{closure#0}::{closure#0}), [i8, Binder { value: extern "RustCall" fn(()) -> Coroutine(DefId(0:11 ~ mvce[8a9d]::create_complex_future#1::{closure#0}::{closure#0}::{closure#0}), [(), std::future::ResumeTy, (), Coroutine(DefId(0:12 ~ mvce[8a9d]::create_complex_future#1::{closure#0}::{closure#0}::{closure#0}::{closure#0}), [(), std::future::ResumeTy, (), &'{erased} Closure(DefId(0:13 ~ mvce[8a9d]::create_complex_future#1::{closure#0}::{closure#0}::{closure#0}::{closure#0}::{closure#0}), [i8, Binder { value: extern "RustCall" fn(()) -> Coroutine(DefId(0:14 ~ mvce[8a9d]::create_complex_future#1::{closure#0}::{closure#0}::{closure#0}::{closure#0}::{closure#0}::{closure#0}), [(), std::future::ResumeTy, (), Alias(Projection, AliasTy { args: [Alias(Opaque, AliasTy { args: [], def_id: DefId(0:4 ~ mvce[8a9d]::invalid_future::{opaque#0}), .. })], def_id: DefId(2:51971 ~ core[a4c7]::future::future::Future::Output), .. }), ()]), bound_vars: [] }, ()]), ()]), ()]), bound_vars: [] }, ()]) in typing_env=TypingEnv { typing_mode: PostAnalysis, param_env: ParamEnv { caller_bounds: [] } }, maybe try to call `try_normalize_erasing_regions` instead


thread 'rustc' (1257487) panicked at compiler/rustc_middle/src/ty/normalize_erasing_regions.rs:171:13:
Box<dyn Any>
stack backtrace:
   0:     0x7fc5a7a5f223 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::hde21067283f7e82e
   1:     0x7fc5a8201afc - core::fmt::write::h24186904251c31cb
   2:     0x7fc5a7a13d93 - std::io::Write::write_fmt::h3ab9f1f4d8d19b72
   3:     0x7fc5a7a253a2 - std::sys::backtrace::BacktraceLock::print::he038489aba5894a6
   4:     0x7fc5a7a2b3f9 - std::panicking::default_hook::{{closure}}::h80a26d916c49679b
   5:     0x7fc5a7a2af23 - std::panicking::default_hook::he2e9efee79b3dce9
   6:     0x7fc5a6a20c91 - std[e95ebcffb71a5621]::panicking::update_hook::<alloc[6ba2be5df7d20276]::boxed::Box<rustc_driver_impl[8bc3447375e6b2d8]::install_ice_hook::{closure#1}>>::{closure#0}
   7:     0x7fc5a7a2b81f - std::panicking::panic_with_hook::hf5648b7cec6bc73e
   8:     0x7fc5a6a5cb31 - std[e95ebcffb71a5621]::panicking::begin_panic::<rustc_errors[88aff0700d119b65]::ExplicitBug>::{closure#0}
   9:     0x7fc5a6a4f386 - std[e95ebcffb71a5621]::sys::backtrace::__rust_end_short_backtrace::<std[e95ebcffb71a5621]::panicking::begin_panic<rustc_errors[88aff0700d119b65]::ExplicitBug>::{closure#0}, !>
  10:     0x7fc5a6a4efc7 - std[e95ebcffb71a5621]::panicking::begin_panic::<rustc_errors[88aff0700d119b65]::ExplicitBug>
  11:     0x7fc5a6a7b161 - <rustc_errors[88aff0700d119b65]::diagnostic::BugAbort as rustc_errors[88aff0700d119b65]::diagnostic::EmissionGuarantee>::emit_producing_guarantee
  12:     0x7fc5a70025fa - rustc_middle[9ce76f953d15e2f6]::util::bug::opt_span_bug_fmt::<rustc_span[28eed06c8d001cb1]::span_encoding::Span>::{closure#0}
  13:     0x7fc5a700277a - rustc_middle[9ce76f953d15e2f6]::ty::context::tls::with_opt::<rustc_middle[9ce76f953d15e2f6]::util::bug::opt_span_bug_fmt<rustc_span[28eed06c8d001cb1]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  14:     0x7fc5a6ff318b - rustc_middle[9ce76f953d15e2f6]::ty::context::tls::with_context_opt::<rustc_middle[9ce76f953d15e2f6]::ty::context::tls::with_opt<rustc_middle[9ce76f953d15e2f6]::util::bug::opt_span_bug_fmt<rustc_span[28eed06c8d001cb1]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  15:     0x7fc5a4d7a660 - rustc_middle[9ce76f953d15e2f6]::util::bug::bug_fmt
  16:     0x7fc5a8251e89 - <rustc_middle[9ce76f953d15e2f6]::ty::normalize_erasing_regions::NormalizeAfterErasingRegionsFolder as rustc_type_ir[5e1db4e3d840b3d9]::fold::TypeFolder<rustc_middle[9ce76f953d15e2f6]::ty::context::TyCtxt>>::fold_ty
  17:     0x7fc5a8f69b6e - rustc_mir_transform[2a90306ef82b18fe]::validate::validate_types
  18:     0x7fc5a94bdc67 - <rustc_mir_transform[2a90306ef82b18fe]::validate::Validator as rustc_mir_transform[2a90306ef82b18fe]::pass_manager::MirPass>::run_pass
  19:     0x7fc5a55e0fb5 - rustc_mir_transform[2a90306ef82b18fe]::pass_manager::validate_body
  20:     0x7fc5a820c08a - rustc_mir_transform[2a90306ef82b18fe]::run_analysis_to_runtime_passes
  21:     0x7fc5a8f098ba - rustc_mir_transform[2a90306ef82b18fe]::mir_drops_elaborated_and_const_checked
  22:     0x7fc5a8f09269 - rustc_query_impl[8ae232d5147ca84e]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[8ae232d5147ca84e]::query_impl::mir_drops_elaborated_and_const_checked::dynamic_query::{closure#2}::{closure#0}, rustc_middle[9ce76f953d15e2f6]::query::erase::Erased<[u8; 8usize]>>
  23:     0x7fc5a852b977 - rustc_query_system[41b9c06994168e52]::query::plumbing::try_execute_query::<rustc_query_impl[8ae232d5147ca84e]::DynamicConfig<rustc_data_structures[de67cf687b97999a]::vec_cache::VecCache<rustc_span[28eed06c8d001cb1]::def_id::LocalDefId, rustc_middle[9ce76f953d15e2f6]::query::erase::Erased<[u8; 8usize]>, rustc_query_system[41b9c06994168e52]::dep_graph::graph::DepNodeIndex>, false, false, false>, rustc_query_impl[8ae232d5147ca84e]::plumbing::QueryCtxt, false>
  24:     0x7fc5a852b009 - rustc_query_impl[8ae232d5147ca84e]::query_impl::mir_drops_elaborated_and_const_checked::get_query_non_incr::__rust_end_short_backtrace
  25:     0x7fc5a8524d80 - <rustc_middle[9ce76f953d15e2f6]::ty::context::TyCtxt>::par_hir_body_owners::<rustc_interface[d5ff205a9ab97820]::passes::run_required_analyses::{closure#1}::{closure#0}>::{closure#0}
  26:     0x7fc5a85222d8 - rustc_interface[d5ff205a9ab97820]::passes::analysis
  27:     0x7fc5a8521773 - rustc_query_impl[8ae232d5147ca84e]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[8ae232d5147ca84e]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[9ce76f953d15e2f6]::query::erase::Erased<[u8; 0usize]>>
  28:     0x7fc5a929d360 - rustc_query_system[41b9c06994168e52]::query::plumbing::try_execute_query::<rustc_query_impl[8ae232d5147ca84e]::DynamicConfig<rustc_query_system[41b9c06994168e52]::query::caches::SingleCache<rustc_middle[9ce76f953d15e2f6]::query::erase::Erased<[u8; 0usize]>>, false, false, false>, rustc_query_impl[8ae232d5147ca84e]::plumbing::QueryCtxt, false>
  29:     0x7fc5a929cfb6 - rustc_query_impl[8ae232d5147ca84e]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  30:     0x7fc5a955a00a - <rustc_interface[d5ff205a9ab97820]::passes::create_and_enter_global_ctxt<core[a4c7c2348b0f0abe]::option::Option<rustc_interface[d5ff205a9ab97820]::queries::Linker>, rustc_driver_impl[8bc3447375e6b2d8]::run_compiler::{closure#0}::{closure#2}>::{closure#2} as core[a4c7c2348b0f0abe]::ops::function::FnOnce<(&rustc_session[84c9ddeb8f325268]::session::Session, rustc_middle[9ce76f953d15e2f6]::ty::context::CurrentGcx, alloc[6ba2be5df7d20276]::sync::Arc<rustc_data_structures[de67cf687b97999a]::jobserver::Proxy>, &std[e95ebcffb71a5621]::sync::once_lock::OnceLock<rustc_middle[9ce76f953d15e2f6]::ty::context::GlobalCtxt>, &rustc_data_structures[de67cf687b97999a]::sync::worker_local::WorkerLocal<rustc_middle[9ce76f953d15e2f6]::arena::Arena>, &rustc_data_structures[de67cf687b97999a]::sync::worker_local::WorkerLocal<rustc_hir[1534e3459f232f80]::Arena>, rustc_driver_impl[8bc3447375e6b2d8]::run_compiler::{closure#0}::{closure#2})>>::call_once::{shim:vtable#0}
  31:     0x7fc5a93fbfe9 - rustc_interface[d5ff205a9ab97820]::interface::run_compiler::<(), rustc_driver_impl[8bc3447375e6b2d8]::run_compiler::{closure#0}>::{closure#1}
  32:     0x7fc5a9090e3c - std[e95ebcffb71a5621]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[d5ff205a9ab97820]::util::run_in_thread_with_globals<rustc_interface[d5ff205a9ab97820]::util::run_in_thread_pool_with_globals<rustc_interface[d5ff205a9ab97820]::interface::run_compiler<(), rustc_driver_impl[8bc3447375e6b2d8]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
  33:     0x7fc5a9090b20 - <<std[e95ebcffb71a5621]::thread::Builder>::spawn_unchecked_<rustc_interface[d5ff205a9ab97820]::util::run_in_thread_with_globals<rustc_interface[d5ff205a9ab97820]::util::run_in_thread_pool_with_globals<rustc_interface[d5ff205a9ab97820]::interface::run_compiler<(), rustc_driver_impl[8bc3447375e6b2d8]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core[a4c7c2348b0f0abe]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  34:     0x7fc5a9095daf - std::sys::thread::unix::Thread::new::thread_start::hb3dc6483caa1b987
  35:     0x7fc5a2a969cb - <unknown>
  36:     0x7fc5a2b1aa0c - <unknown>
  37:                0x0 - <unknown>

note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md

note: please make sure that you have updated to the latest nightly

note: rustc 1.93.0-nightly (c90bcb957 2025-11-06) running on x86_64-unknown-linux-gnu

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

query stack during panic:
#0 [mir_drops_elaborated_and_const_checked] elaborating drops for `create_complex_future::{closure#0}`
#1 [analysis] running analysis passes on crate `mvce`
end of query stack
error: internal compiler error: compiler/rustc_middle/src/ty/normalize_erasing_regions.rs:171:13: Failed to normalize Coroutine(DefId(0:12 ~ mvce[8a9d]::create_complex_future#1::{closure#0}::{closure#0}::{closure#0}::{closure#0}), [(), std::future::ResumeTy, (), &'{erased} Closure(DefId(0:13 ~ mvce[8a9d]::create_complex_future#1::{closure#0}::{closure#0}::{closure#0}::{closure#0}::{closure#0}), [i8, Binder { value: extern "RustCall" fn(()) -> Coroutine(DefId(0:14 ~ mvce[8a9d]::create_complex_future#1::{closure#0}::{closure#0}::{closure#0}::{closure#0}::{closure#0}::{closure#0}), [(), std::future::ResumeTy, (), Alias(Projection, AliasTy { args: [Alias(Opaque, AliasTy { args: [], def_id: DefId(0:4 ~ mvce[8a9d]::invalid_future::{opaque#0}), .. })], def_id: DefId(2:51971 ~ core[a4c7]::future::future::Future::Output), .. }), ()]), bound_vars: [] }, ()]), ()]) in typing_env=TypingEnv { typing_mode: PostAnalysis, param_env: ParamEnv { caller_bounds: [] } }, maybe try to call `try_normalize_erasing_regions` instead


thread 'rustc' (1257487) panicked at compiler/rustc_middle/src/ty/normalize_erasing_regions.rs:171:13:
Box<dyn Any>
stack backtrace:
   0:     0x7fc5a7a5f223 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::hde21067283f7e82e
   1:     0x7fc5a8201afc - core::fmt::write::h24186904251c31cb
   2:     0x7fc5a7a13d93 - std::io::Write::write_fmt::h3ab9f1f4d8d19b72
   3:     0x7fc5a7a253a2 - std::sys::backtrace::BacktraceLock::print::he038489aba5894a6
   4:     0x7fc5a7a2b3f9 - std::panicking::default_hook::{{closure}}::h80a26d916c49679b
   5:     0x7fc5a7a2af23 - std::panicking::default_hook::he2e9efee79b3dce9
   6:     0x7fc5a6a20c91 - std[e95ebcffb71a5621]::panicking::update_hook::<alloc[6ba2be5df7d20276]::boxed::Box<rustc_driver_impl[8bc3447375e6b2d8]::install_ice_hook::{closure#1}>>::{closure#0}
   7:     0x7fc5a7a2b81f - std::panicking::panic_with_hook::hf5648b7cec6bc73e
   8:     0x7fc5a6a5cb31 - std[e95ebcffb71a5621]::panicking::begin_panic::<rustc_errors[88aff0700d119b65]::ExplicitBug>::{closure#0}
   9:     0x7fc5a6a4f386 - std[e95ebcffb71a5621]::sys::backtrace::__rust_end_short_backtrace::<std[e95ebcffb71a5621]::panicking::begin_panic<rustc_errors[88aff0700d119b65]::ExplicitBug>::{closure#0}, !>
  10:     0x7fc5a6a4efc7 - std[e95ebcffb71a5621]::panicking::begin_panic::<rustc_errors[88aff0700d119b65]::ExplicitBug>
  11:     0x7fc5a6a7b161 - <rustc_errors[88aff0700d119b65]::diagnostic::BugAbort as rustc_errors[88aff0700d119b65]::diagnostic::EmissionGuarantee>::emit_producing_guarantee
  12:     0x7fc5a70025fa - rustc_middle[9ce76f953d15e2f6]::util::bug::opt_span_bug_fmt::<rustc_span[28eed06c8d001cb1]::span_encoding::Span>::{closure#0}
  13:     0x7fc5a700277a - rustc_middle[9ce76f953d15e2f6]::ty::context::tls::with_opt::<rustc_middle[9ce76f953d15e2f6]::util::bug::opt_span_bug_fmt<rustc_span[28eed06c8d001cb1]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  14:     0x7fc5a6ff318b - rustc_middle[9ce76f953d15e2f6]::ty::context::tls::with_context_opt::<rustc_middle[9ce76f953d15e2f6]::ty::context::tls::with_opt<rustc_middle[9ce76f953d15e2f6]::util::bug::opt_span_bug_fmt<rustc_span[28eed06c8d001cb1]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  15:     0x7fc5a4d7a660 - rustc_middle[9ce76f953d15e2f6]::util::bug::bug_fmt
  16:     0x7fc5a8251e89 - <rustc_middle[9ce76f953d15e2f6]::ty::normalize_erasing_regions::NormalizeAfterErasingRegionsFolder as rustc_type_ir[5e1db4e3d840b3d9]::fold::TypeFolder<rustc_middle[9ce76f953d15e2f6]::ty::context::TyCtxt>>::fold_ty
  17:     0x7fc5a8f69b6e - rustc_mir_transform[2a90306ef82b18fe]::validate::validate_types
  18:     0x7fc5a94bdc67 - <rustc_mir_transform[2a90306ef82b18fe]::validate::Validator as rustc_mir_transform[2a90306ef82b18fe]::pass_manager::MirPass>::run_pass
  19:     0x7fc5a55e0fb5 - rustc_mir_transform[2a90306ef82b18fe]::pass_manager::validate_body
  20:     0x7fc5a820c08a - rustc_mir_transform[2a90306ef82b18fe]::run_analysis_to_runtime_passes
  21:     0x7fc5a8f098ba - rustc_mir_transform[2a90306ef82b18fe]::mir_drops_elaborated_and_const_checked
  22:     0x7fc5a8f09269 - rustc_query_impl[8ae232d5147ca84e]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[8ae232d5147ca84e]::query_impl::mir_drops_elaborated_and_const_checked::dynamic_query::{closure#2}::{closure#0}, rustc_middle[9ce76f953d15e2f6]::query::erase::Erased<[u8; 8usize]>>
  23:     0x7fc5a852b977 - rustc_query_system[41b9c06994168e52]::query::plumbing::try_execute_query::<rustc_query_impl[8ae232d5147ca84e]::DynamicConfig<rustc_data_structures[de67cf687b97999a]::vec_cache::VecCache<rustc_span[28eed06c8d001cb1]::def_id::LocalDefId, rustc_middle[9ce76f953d15e2f6]::query::erase::Erased<[u8; 8usize]>, rustc_query_system[41b9c06994168e52]::dep_graph::graph::DepNodeIndex>, false, false, false>, rustc_query_impl[8ae232d5147ca84e]::plumbing::QueryCtxt, false>
  24:     0x7fc5a852b009 - rustc_query_impl[8ae232d5147ca84e]::query_impl::mir_drops_elaborated_and_const_checked::get_query_non_incr::__rust_end_short_backtrace
  25:     0x7fc5a8524d80 - <rustc_middle[9ce76f953d15e2f6]::ty::context::TyCtxt>::par_hir_body_owners::<rustc_interface[d5ff205a9ab97820]::passes::run_required_analyses::{closure#1}::{closure#0}>::{closure#0}
  26:     0x7fc5a85222d8 - rustc_interface[d5ff205a9ab97820]::passes::analysis
  27:     0x7fc5a8521773 - rustc_query_impl[8ae232d5147ca84e]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[8ae232d5147ca84e]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[9ce76f953d15e2f6]::query::erase::Erased<[u8; 0usize]>>
  28:     0x7fc5a929d360 - rustc_query_system[41b9c06994168e52]::query::plumbing::try_execute_query::<rustc_query_impl[8ae232d5147ca84e]::DynamicConfig<rustc_query_system[41b9c06994168e52]::query::caches::SingleCache<rustc_middle[9ce76f953d15e2f6]::query::erase::Erased<[u8; 0usize]>>, false, false, false>, rustc_query_impl[8ae232d5147ca84e]::plumbing::QueryCtxt, false>
  29:     0x7fc5a929cfb6 - rustc_query_impl[8ae232d5147ca84e]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  30:     0x7fc5a955a00a - <rustc_interface[d5ff205a9ab97820]::passes::create_and_enter_global_ctxt<core[a4c7c2348b0f0abe]::option::Option<rustc_interface[d5ff205a9ab97820]::queries::Linker>, rustc_driver_impl[8bc3447375e6b2d8]::run_compiler::{closure#0}::{closure#2}>::{closure#2} as core[a4c7c2348b0f0abe]::ops::function::FnOnce<(&rustc_session[84c9ddeb8f325268]::session::Session, rustc_middle[9ce76f953d15e2f6]::ty::context::CurrentGcx, alloc[6ba2be5df7d20276]::sync::Arc<rustc_data_structures[de67cf687b97999a]::jobserver::Proxy>, &std[e95ebcffb71a5621]::sync::once_lock::OnceLock<rustc_middle[9ce76f953d15e2f6]::ty::context::GlobalCtxt>, &rustc_data_structures[de67cf687b97999a]::sync::worker_local::WorkerLocal<rustc_middle[9ce76f953d15e2f6]::arena::Arena>, &rustc_data_structures[de67cf687b97999a]::sync::worker_local::WorkerLocal<rustc_hir[1534e3459f232f80]::Arena>, rustc_driver_impl[8bc3447375e6b2d8]::run_compiler::{closure#0}::{closure#2})>>::call_once::{shim:vtable#0}
  31:     0x7fc5a93fbfe9 - rustc_interface[d5ff205a9ab97820]::interface::run_compiler::<(), rustc_driver_impl[8bc3447375e6b2d8]::run_compiler::{closure#0}>::{closure#1}
  32:     0x7fc5a9090e3c - std[e95ebcffb71a5621]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[d5ff205a9ab97820]::util::run_in_thread_with_globals<rustc_interface[d5ff205a9ab97820]::util::run_in_thread_pool_with_globals<rustc_interface[d5ff205a9ab97820]::interface::run_compiler<(), rustc_driver_impl[8bc3447375e6b2d8]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
  33:     0x7fc5a9090b20 - <<std[e95ebcffb71a5621]::thread::Builder>::spawn_unchecked_<rustc_interface[d5ff205a9ab97820]::util::run_in_thread_with_globals<rustc_interface[d5ff205a9ab97820]::util::run_in_thread_pool_with_globals<rustc_interface[d5ff205a9ab97820]::interface::run_compiler<(), rustc_driver_impl[8bc3447375e6b2d8]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core[a4c7c2348b0f0abe]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  34:     0x7fc5a9095daf - std::sys::thread::unix::Thread::new::thread_start::hb3dc6483caa1b987
  35:     0x7fc5a2a969cb - <unknown>
  36:     0x7fc5a2b1aa0c - <unknown>
  37:                0x0 - <unknown>

note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md

note: please make sure that you have updated to the latest nightly

note: rustc 1.93.0-nightly (c90bcb957 2025-11-06) running on x86_64-unknown-linux-gnu

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

query stack during panic:
#0 [mir_drops_elaborated_and_const_checked] elaborating drops for `create_complex_future::{closure#0}::{closure#0}::{closure#0}`
#1 [analysis] running analysis passes on crate `mvce`
end of query stack
error: internal compiler error: compiler/rustc_middle/src/ty/normalize_erasing_regions.rs:171:13: Failed to normalize &'{erased} Closure(DefId(0:13 ~ mvce[8a9d]::create_complex_future#1::{closure#0}::{closure#0}::{closure#0}::{closure#0}::{closure#0}), [i8, Binder { value: extern "RustCall" fn(()) -> Coroutine(DefId(0:14 ~ mvce[8a9d]::create_complex_future#1::{closure#0}::{closure#0}::{closure#0}::{closure#0}::{closure#0}::{closure#0}), [(), std::future::ResumeTy, (), Alias(Projection, AliasTy { args: [Alias(Opaque, AliasTy { args: [], def_id: DefId(0:4 ~ mvce[8a9d]::invalid_future::{opaque#0}), .. })], def_id: DefId(2:51971 ~ core[a4c7]::future::future::Future::Output), .. }), ()]), bound_vars: [] }, ()]) in typing_env=TypingEnv { typing_mode: PostAnalysis, param_env: ParamEnv { caller_bounds: [] } }, maybe try to call `try_normalize_erasing_regions` instead


thread 'rustc' (1257487) panicked at compiler/rustc_middle/src/ty/normalize_erasing_regions.rs:171:13:
Box<dyn Any>
stack backtrace:
   0:     0x7fc5a7a5f223 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::hde21067283f7e82e
   1:     0x7fc5a8201afc - core::fmt::write::h24186904251c31cb
   2:     0x7fc5a7a13d93 - std::io::Write::write_fmt::h3ab9f1f4d8d19b72
   3:     0x7fc5a7a253a2 - std::sys::backtrace::BacktraceLock::print::he038489aba5894a6
   4:     0x7fc5a7a2b3f9 - std::panicking::default_hook::{{closure}}::h80a26d916c49679b
   5:     0x7fc5a7a2af23 - std::panicking::default_hook::he2e9efee79b3dce9
   6:     0x7fc5a6a20c91 - std[e95ebcffb71a5621]::panicking::update_hook::<alloc[6ba2be5df7d20276]::boxed::Box<rustc_driver_impl[8bc3447375e6b2d8]::install_ice_hook::{closure#1}>>::{closure#0}
   7:     0x7fc5a7a2b81f - std::panicking::panic_with_hook::hf5648b7cec6bc73e
   8:     0x7fc5a6a5cb31 - std[e95ebcffb71a5621]::panicking::begin_panic::<rustc_errors[88aff0700d119b65]::ExplicitBug>::{closure#0}
   9:     0x7fc5a6a4f386 - std[e95ebcffb71a5621]::sys::backtrace::__rust_end_short_backtrace::<std[e95ebcffb71a5621]::panicking::begin_panic<rustc_errors[88aff0700d119b65]::ExplicitBug>::{closure#0}, !>
  10:     0x7fc5a6a4efc7 - std[e95ebcffb71a5621]::panicking::begin_panic::<rustc_errors[88aff0700d119b65]::ExplicitBug>
  11:     0x7fc5a6a7b161 - <rustc_errors[88aff0700d119b65]::diagnostic::BugAbort as rustc_errors[88aff0700d119b65]::diagnostic::EmissionGuarantee>::emit_producing_guarantee
  12:     0x7fc5a70025fa - rustc_middle[9ce76f953d15e2f6]::util::bug::opt_span_bug_fmt::<rustc_span[28eed06c8d001cb1]::span_encoding::Span>::{closure#0}
  13:     0x7fc5a700277a - rustc_middle[9ce76f953d15e2f6]::ty::context::tls::with_opt::<rustc_middle[9ce76f953d15e2f6]::util::bug::opt_span_bug_fmt<rustc_span[28eed06c8d001cb1]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  14:     0x7fc5a6ff318b - rustc_middle[9ce76f953d15e2f6]::ty::context::tls::with_context_opt::<rustc_middle[9ce76f953d15e2f6]::ty::context::tls::with_opt<rustc_middle[9ce76f953d15e2f6]::util::bug::opt_span_bug_fmt<rustc_span[28eed06c8d001cb1]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  15:     0x7fc5a4d7a660 - rustc_middle[9ce76f953d15e2f6]::util::bug::bug_fmt
  16:     0x7fc5a8251e89 - <rustc_middle[9ce76f953d15e2f6]::ty::normalize_erasing_regions::NormalizeAfterErasingRegionsFolder as rustc_type_ir[5e1db4e3d840b3d9]::fold::TypeFolder<rustc_middle[9ce76f953d15e2f6]::ty::context::TyCtxt>>::fold_ty
  17:     0x7fc5a8f69b6e - rustc_mir_transform[2a90306ef82b18fe]::validate::validate_types
  18:     0x7fc5a94bdc67 - <rustc_mir_transform[2a90306ef82b18fe]::validate::Validator as rustc_mir_transform[2a90306ef82b18fe]::pass_manager::MirPass>::run_pass
  19:     0x7fc5a55e0fb5 - rustc_mir_transform[2a90306ef82b18fe]::pass_manager::validate_body
  20:     0x7fc5a820c08a - rustc_mir_transform[2a90306ef82b18fe]::run_analysis_to_runtime_passes
  21:     0x7fc5a8f098ba - rustc_mir_transform[2a90306ef82b18fe]::mir_drops_elaborated_and_const_checked
  22:     0x7fc5a8f09269 - rustc_query_impl[8ae232d5147ca84e]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[8ae232d5147ca84e]::query_impl::mir_drops_elaborated_and_const_checked::dynamic_query::{closure#2}::{closure#0}, rustc_middle[9ce76f953d15e2f6]::query::erase::Erased<[u8; 8usize]>>
  23:     0x7fc5a852b977 - rustc_query_system[41b9c06994168e52]::query::plumbing::try_execute_query::<rustc_query_impl[8ae232d5147ca84e]::DynamicConfig<rustc_data_structures[de67cf687b97999a]::vec_cache::VecCache<rustc_span[28eed06c8d001cb1]::def_id::LocalDefId, rustc_middle[9ce76f953d15e2f6]::query::erase::Erased<[u8; 8usize]>, rustc_query_system[41b9c06994168e52]::dep_graph::graph::DepNodeIndex>, false, false, false>, rustc_query_impl[8ae232d5147ca84e]::plumbing::QueryCtxt, false>
  24:     0x7fc5a852b009 - rustc_query_impl[8ae232d5147ca84e]::query_impl::mir_drops_elaborated_and_const_checked::get_query_non_incr::__rust_end_short_backtrace
  25:     0x7fc5a8524d80 - <rustc_middle[9ce76f953d15e2f6]::ty::context::TyCtxt>::par_hir_body_owners::<rustc_interface[d5ff205a9ab97820]::passes::run_required_analyses::{closure#1}::{closure#0}>::{closure#0}
  26:     0x7fc5a85222d8 - rustc_interface[d5ff205a9ab97820]::passes::analysis
  27:     0x7fc5a8521773 - rustc_query_impl[8ae232d5147ca84e]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[8ae232d5147ca84e]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[9ce76f953d15e2f6]::query::erase::Erased<[u8; 0usize]>>
  28:     0x7fc5a929d360 - rustc_query_system[41b9c06994168e52]::query::plumbing::try_execute_query::<rustc_query_impl[8ae232d5147ca84e]::DynamicConfig<rustc_query_system[41b9c06994168e52]::query::caches::SingleCache<rustc_middle[9ce76f953d15e2f6]::query::erase::Erased<[u8; 0usize]>>, false, false, false>, rustc_query_impl[8ae232d5147ca84e]::plumbing::QueryCtxt, false>
  29:     0x7fc5a929cfb6 - rustc_query_impl[8ae232d5147ca84e]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  30:     0x7fc5a955a00a - <rustc_interface[d5ff205a9ab97820]::passes::create_and_enter_global_ctxt<core[a4c7c2348b0f0abe]::option::Option<rustc_interface[d5ff205a9ab97820]::queries::Linker>, rustc_driver_impl[8bc3447375e6b2d8]::run_compiler::{closure#0}::{closure#2}>::{closure#2} as core[a4c7c2348b0f0abe]::ops::function::FnOnce<(&rustc_session[84c9ddeb8f325268]::session::Session, rustc_middle[9ce76f953d15e2f6]::ty::context::CurrentGcx, alloc[6ba2be5df7d20276]::sync::Arc<rustc_data_structures[de67cf687b97999a]::jobserver::Proxy>, &std[e95ebcffb71a5621]::sync::once_lock::OnceLock<rustc_middle[9ce76f953d15e2f6]::ty::context::GlobalCtxt>, &rustc_data_structures[de67cf687b97999a]::sync::worker_local::WorkerLocal<rustc_middle[9ce76f953d15e2f6]::arena::Arena>, &rustc_data_structures[de67cf687b97999a]::sync::worker_local::WorkerLocal<rustc_hir[1534e3459f232f80]::Arena>, rustc_driver_impl[8bc3447375e6b2d8]::run_compiler::{closure#0}::{closure#2})>>::call_once::{shim:vtable#0}
  31:     0x7fc5a93fbfe9 - rustc_interface[d5ff205a9ab97820]::interface::run_compiler::<(), rustc_driver_impl[8bc3447375e6b2d8]::run_compiler::{closure#0}>::{closure#1}
  32:     0x7fc5a9090e3c - std[e95ebcffb71a5621]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[d5ff205a9ab97820]::util::run_in_thread_with_globals<rustc_interface[d5ff205a9ab97820]::util::run_in_thread_pool_with_globals<rustc_interface[d5ff205a9ab97820]::interface::run_compiler<(), rustc_driver_impl[8bc3447375e6b2d8]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
  33:     0x7fc5a9090b20 - <<std[e95ebcffb71a5621]::thread::Builder>::spawn_unchecked_<rustc_interface[d5ff205a9ab97820]::util::run_in_thread_with_globals<rustc_interface[d5ff205a9ab97820]::util::run_in_thread_pool_with_globals<rustc_interface[d5ff205a9ab97820]::interface::run_compiler<(), rustc_driver_impl[8bc3447375e6b2d8]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core[a4c7c2348b0f0abe]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  34:     0x7fc5a9095daf - std::sys::thread::unix::Thread::new::thread_start::hb3dc6483caa1b987
  35:     0x7fc5a2a969cb - <unknown>
  36:     0x7fc5a2b1aa0c - <unknown>
  37:                0x0 - <unknown>

note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md

note: please make sure that you have updated to the latest nightly

note: rustc 1.93.0-nightly (c90bcb957 2025-11-06) running on x86_64-unknown-linux-gnu

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

query stack during panic:
#0 [mir_drops_elaborated_and_const_checked] elaborating drops for `create_complex_future::{closure#0}::{closure#0}::{closure#0}::{closure#0}`
#1 [analysis] running analysis passes on crate `mvce`
end of query stack
error: internal compiler error: compiler/rustc_middle/src/ty/normalize_erasing_regions.rs:171:13: Failed to normalize Alias(Projection, AliasTy { args: [Alias(Opaque, AliasTy { args: [], def_id: DefId(0:4 ~ mvce[8a9d]::invalid_future::{opaque#0}), .. })], def_id: DefId(2:51971 ~ core[a4c7]::future::future::Future::Output), .. }) in typing_env=TypingEnv { typing_mode: PostAnalysis, param_env: ParamEnv { caller_bounds: [] } }, maybe try to call `try_normalize_erasing_regions` instead


thread 'rustc' (1257487) panicked at compiler/rustc_middle/src/ty/normalize_erasing_regions.rs:171:13:
Box<dyn Any>
stack backtrace:
   0:     0x7fc5a7a5f223 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::hde21067283f7e82e
   1:     0x7fc5a8201afc - core::fmt::write::h24186904251c31cb
   2:     0x7fc5a7a13d93 - std::io::Write::write_fmt::h3ab9f1f4d8d19b72
   3:     0x7fc5a7a253a2 - std::sys::backtrace::BacktraceLock::print::he038489aba5894a6
   4:     0x7fc5a7a2b3f9 - std::panicking::default_hook::{{closure}}::h80a26d916c49679b
   5:     0x7fc5a7a2af23 - std::panicking::default_hook::he2e9efee79b3dce9
   6:     0x7fc5a6a20c91 - std[e95ebcffb71a5621]::panicking::update_hook::<alloc[6ba2be5df7d20276]::boxed::Box<rustc_driver_impl[8bc3447375e6b2d8]::install_ice_hook::{closure#1}>>::{closure#0}
   7:     0x7fc5a7a2b81f - std::panicking::panic_with_hook::hf5648b7cec6bc73e
   8:     0x7fc5a6a5cb31 - std[e95ebcffb71a5621]::panicking::begin_panic::<rustc_errors[88aff0700d119b65]::ExplicitBug>::{closure#0}
   9:     0x7fc5a6a4f386 - std[e95ebcffb71a5621]::sys::backtrace::__rust_end_short_backtrace::<std[e95ebcffb71a5621]::panicking::begin_panic<rustc_errors[88aff0700d119b65]::ExplicitBug>::{closure#0}, !>
  10:     0x7fc5a6a4efc7 - std[e95ebcffb71a5621]::panicking::begin_panic::<rustc_errors[88aff0700d119b65]::ExplicitBug>
  11:     0x7fc5a6a7b161 - <rustc_errors[88aff0700d119b65]::diagnostic::BugAbort as rustc_errors[88aff0700d119b65]::diagnostic::EmissionGuarantee>::emit_producing_guarantee
  12:     0x7fc5a70025fa - rustc_middle[9ce76f953d15e2f6]::util::bug::opt_span_bug_fmt::<rustc_span[28eed06c8d001cb1]::span_encoding::Span>::{closure#0}
  13:     0x7fc5a700277a - rustc_middle[9ce76f953d15e2f6]::ty::context::tls::with_opt::<rustc_middle[9ce76f953d15e2f6]::util::bug::opt_span_bug_fmt<rustc_span[28eed06c8d001cb1]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  14:     0x7fc5a6ff318b - rustc_middle[9ce76f953d15e2f6]::ty::context::tls::with_context_opt::<rustc_middle[9ce76f953d15e2f6]::ty::context::tls::with_opt<rustc_middle[9ce76f953d15e2f6]::util::bug::opt_span_bug_fmt<rustc_span[28eed06c8d001cb1]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  15:     0x7fc5a4d7a660 - rustc_middle[9ce76f953d15e2f6]::util::bug::bug_fmt
  16:     0x7fc5a8251e89 - <rustc_middle[9ce76f953d15e2f6]::ty::normalize_erasing_regions::NormalizeAfterErasingRegionsFolder as rustc_type_ir[5e1db4e3d840b3d9]::fold::TypeFolder<rustc_middle[9ce76f953d15e2f6]::ty::context::TyCtxt>>::fold_ty
  17:     0x7fc5a8f69b6e - rustc_mir_transform[2a90306ef82b18fe]::validate::validate_types
  18:     0x7fc5a94bdc67 - <rustc_mir_transform[2a90306ef82b18fe]::validate::Validator as rustc_mir_transform[2a90306ef82b18fe]::pass_manager::MirPass>::run_pass
  19:     0x7fc5a55e0fb5 - rustc_mir_transform[2a90306ef82b18fe]::pass_manager::validate_body
  20:     0x7fc5a820c08a - rustc_mir_transform[2a90306ef82b18fe]::run_analysis_to_runtime_passes
  21:     0x7fc5a8f098ba - rustc_mir_transform[2a90306ef82b18fe]::mir_drops_elaborated_and_const_checked
  22:     0x7fc5a8f09269 - rustc_query_impl[8ae232d5147ca84e]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[8ae232d5147ca84e]::query_impl::mir_drops_elaborated_and_const_checked::dynamic_query::{closure#2}::{closure#0}, rustc_middle[9ce76f953d15e2f6]::query::erase::Erased<[u8; 8usize]>>
  23:     0x7fc5a852b977 - rustc_query_system[41b9c06994168e52]::query::plumbing::try_execute_query::<rustc_query_impl[8ae232d5147ca84e]::DynamicConfig<rustc_data_structures[de67cf687b97999a]::vec_cache::VecCache<rustc_span[28eed06c8d001cb1]::def_id::LocalDefId, rustc_middle[9ce76f953d15e2f6]::query::erase::Erased<[u8; 8usize]>, rustc_query_system[41b9c06994168e52]::dep_graph::graph::DepNodeIndex>, false, false, false>, rustc_query_impl[8ae232d5147ca84e]::plumbing::QueryCtxt, false>
  24:     0x7fc5a852b009 - rustc_query_impl[8ae232d5147ca84e]::query_impl::mir_drops_elaborated_and_const_checked::get_query_non_incr::__rust_end_short_backtrace
  25:     0x7fc5a8524d80 - <rustc_middle[9ce76f953d15e2f6]::ty::context::TyCtxt>::par_hir_body_owners::<rustc_interface[d5ff205a9ab97820]::passes::run_required_analyses::{closure#1}::{closure#0}>::{closure#0}
  26:     0x7fc5a85222d8 - rustc_interface[d5ff205a9ab97820]::passes::analysis
  27:     0x7fc5a8521773 - rustc_query_impl[8ae232d5147ca84e]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[8ae232d5147ca84e]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[9ce76f953d15e2f6]::query::erase::Erased<[u8; 0usize]>>
  28:     0x7fc5a929d360 - rustc_query_system[41b9c06994168e52]::query::plumbing::try_execute_query::<rustc_query_impl[8ae232d5147ca84e]::DynamicConfig<rustc_query_system[41b9c06994168e52]::query::caches::SingleCache<rustc_middle[9ce76f953d15e2f6]::query::erase::Erased<[u8; 0usize]>>, false, false, false>, rustc_query_impl[8ae232d5147ca84e]::plumbing::QueryCtxt, false>
  29:     0x7fc5a929cfb6 - rustc_query_impl[8ae232d5147ca84e]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  30:     0x7fc5a955a00a - <rustc_interface[d5ff205a9ab97820]::passes::create_and_enter_global_ctxt<core[a4c7c2348b0f0abe]::option::Option<rustc_interface[d5ff205a9ab97820]::queries::Linker>, rustc_driver_impl[8bc3447375e6b2d8]::run_compiler::{closure#0}::{closure#2}>::{closure#2} as core[a4c7c2348b0f0abe]::ops::function::FnOnce<(&rustc_session[84c9ddeb8f325268]::session::Session, rustc_middle[9ce76f953d15e2f6]::ty::context::CurrentGcx, alloc[6ba2be5df7d20276]::sync::Arc<rustc_data_structures[de67cf687b97999a]::jobserver::Proxy>, &std[e95ebcffb71a5621]::sync::once_lock::OnceLock<rustc_middle[9ce76f953d15e2f6]::ty::context::GlobalCtxt>, &rustc_data_structures[de67cf687b97999a]::sync::worker_local::WorkerLocal<rustc_middle[9ce76f953d15e2f6]::arena::Arena>, &rustc_data_structures[de67cf687b97999a]::sync::worker_local::WorkerLocal<rustc_hir[1534e3459f232f80]::Arena>, rustc_driver_impl[8bc3447375e6b2d8]::run_compiler::{closure#0}::{closure#2})>>::call_once::{shim:vtable#0}
  31:     0x7fc5a93fbfe9 - rustc_interface[d5ff205a9ab97820]::interface::run_compiler::<(), rustc_driver_impl[8bc3447375e6b2d8]::run_compiler::{closure#0}>::{closure#1}
  32:     0x7fc5a9090e3c - std[e95ebcffb71a5621]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[d5ff205a9ab97820]::util::run_in_thread_with_globals<rustc_interface[d5ff205a9ab97820]::util::run_in_thread_pool_with_globals<rustc_interface[d5ff205a9ab97820]::interface::run_compiler<(), rustc_driver_impl[8bc3447375e6b2d8]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
  33:     0x7fc5a9090b20 - <<std[e95ebcffb71a5621]::thread::Builder>::spawn_unchecked_<rustc_interface[d5ff205a9ab97820]::util::run_in_thread_with_globals<rustc_interface[d5ff205a9ab97820]::util::run_in_thread_pool_with_globals<rustc_interface[d5ff205a9ab97820]::interface::run_compiler<(), rustc_driver_impl[8bc3447375e6b2d8]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core[a4c7c2348b0f0abe]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  34:     0x7fc5a9095daf - std::sys::thread::unix::Thread::new::thread_start::hb3dc6483caa1b987
  35:     0x7fc5a2a969cb - <unknown>
  36:     0x7fc5a2b1aa0c - <unknown>
  37:                0x0 - <unknown>

note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md

note: please make sure that you have updated to the latest nightly

note: rustc 1.93.0-nightly (c90bcb957 2025-11-06) running on x86_64-unknown-linux-gnu

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

query stack during panic:
#0 [mir_drops_elaborated_and_const_checked] elaborating drops for `create_complex_future::{closure#0}::{closure#0}::{closure#0}::{closure#0}::{closure#0}::{closure#0}`
#1 [analysis] running analysis passes on crate `mvce`
end of query stack
error: aborting due to 7 previous errors; 1 warning emitted

Some errors have detailed explanations: E0277, E0428, E0601.
For more information about an error, try `rustc --explain E0277`.

	fn normalize_generic_arg_after_erasing_regions(
	&self,
	arg: ty::GenericArg<'tcx>,
	) -> ty::GenericArg<'tcx> {
	let arg = self.typing_env.as_query_input(arg);
	self.tcx.try_normalize_generic_arg_after_erasing_regions(arg).unwrap_or_else(\|_\| {
	bug!(
	"Failed to normalize {:?} in typing_env={:?}, \
	maybe try to call `try_normalize_erasing_regions` instead",
	arg.value,
	self.typing_env,
	)
	})