ICE due to implementing auto trait on typeof(closure) #146620
Description
Code
unsafe impl Send for typeof(||{}) {}Meta
Reproducible on the playground with version 1.92.0-nightly (2025-09-15 a454fccb02df9d361f12)
Error output
error[E0516]: `typeof` is a reserved keyword but unimplemented --> src/lib.rs:1:22 | 1 | unsafe impl Send for typeof(||{}) {} | ^^^^^^^^^^^^ reserved keyword error: internal compiler error: compiler/rustc_hir_analysis/src/coherence/orphan.rs:238:17: weird self type for autotrait impl --> src/lib.rs:1:1 | 1 | unsafe impl Send for typeof(||{}) {} | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Backtrace
thread 'rustc' (51) panicked at compiler/rustc_hir_analysis/src/coherence/orphan.rs:238:17: Box<dyn Any> stack backtrace: 0: std::panicking::begin_panic::<rustc_errors::ExplicitBug> 1: <rustc_errors::diagnostic::BugAbort as rustc_errors::diagnostic::EmissionGuarantee>::emit_producing_guarantee 2: <rustc_errors::DiagCtxtHandle>::span_bug::<rustc_span::span_encoding::Span, alloc::string::String> 3: rustc_middle::util::bug::opt_span_bug_fmt::<rustc_span::span_encoding::Span>::{closure#0} 4: rustc_middle::ty::context::tls::with_opt::<rustc_middle::util::bug::opt_span_bug_fmt<rustc_span::span_encoding::Span>::{closure#0}, !>::{closure#0} 5: rustc_middle::ty::context::tls::with_context_opt::<rustc_middle::ty::context::tls::with_opt<rustc_middle::util::bug::opt_span_bug_fmt<rustc_span::span_encoding::Span>::{closure#0}, !>::{closure#0}, !> 6: rustc_middle::util::bug::span_bug_fmt::<rustc_span::span_encoding::Span> 7: rustc_hir_analysis::coherence::orphan::orphan_check_impl [... omitted 1 frame ...] 8: rustc_hir_analysis::coherence::coherent_trait [... omitted 1 frame ...] 9: rustc_hir_analysis::check::check::check_item_type 10: rustc_hir_analysis::check::wfcheck::check_well_formed [... omitted 1 frame ...] 11: rustc_hir_analysis::check::wfcheck::check_type_wf [... omitted 1 frame ...] 12: rustc_hir_analysis::check_crate 13: rustc_interface::passes::analysis [... omitted 1 frame ...] 14: rustc_interface::passes::create_and_enter_global_ctxt::<core::option::Option<rustc_interface::queries::Linker>, rustc_driver_impl::run_compiler::{closure#0}::{closure#2}>::{closure#2}::{closure#0} 15: rustc_interface::interface::run_compiler::<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1} note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace. note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md note: please make sure that you have updated to the latest nightly note: please attach the file at `/playground/rustc-ice-2025-09-16T03_59_18-49.txt` to your bug report note: compiler flags: --crate-type lib -C embed-bitcode=no -C codegen-units=1 -C debuginfo=2 note: some of the compiler flags provided by cargo are hidden query stack during panic: #0 [orphan_check_impl] checking whether impl `<impl at src/lib.rs:1:1: 1:34>` follows the orphan rules #1 [coherent_trait] coherence checking all impls of trait `core::marker::Send` #2 [check_well_formed] checking that `<impl at src/lib.rs:1:1: 1:34>` is well-formed #3 [check_type_wf] checking that types are well-formed #4 [analysis] running analysis passes on this crate end of query stack For more information about this error, try `rustc --explain E0516`.