alamb opened a new issue, #8181: URL: https://github.com/apache/arrow-rs/issues/8181
**Describe the bug** > error: the compiler unexpectedly panicked. this is a bug. Example: https://github.com/apache/arrow-rs/actions/runs/17096182578/job/48489772206?pr=8176 ``` ---- arrow-array/src/builder/mod.rs - builder (line 94) stdout ---- thread 'rustc' (8171) panicked at compiler/rustc_trait_selection/src/traits/select/mod.rs:294:24: `TraitPredicate(<&'a std::vec::Vec<std::option::Option<&str>> as std::iter::IntoIterator>, polarity:Positive)` has escaping bound vars, so it cannot be wrapped in a dummy binder. stack backtrace: 0: 0x7f422ac1e043 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::hcf053f473b56a7a6 1: 0x7f422b401a18 - core::fmt::write::h426d217b3f074042 2: 0x7f422ac08e03 - std::io::Write::write_fmt::h68df8f9b11af571d 3: 0x7f422ac1dea2 - std::sys::backtrace::BacktraceLock::print::h084654a96f004385 4: 0x7f422ac00711 - std::panicking::default_hook::{{closure}}::h22fc639cc60120ae 5: 0x7f422ac0023d - std::panicking::default_hook::hb7c4395f23295180 6: 0x7f4229c6b6f5 - std[91586dded61bf123]::panicking::update_hook::<alloc[a8496826333dd81]::boxed::Box<rustc_driver_impl[a32761b8ae1cc4b0]::install_ice_hook::{closure#1}>>::{closure#0} 7: 0x7f422ac0115e - std::panicking::panic_with_hook::he8374db060d96dcd 8: 0x7f422ac1e57a - std::panicking::panic_handler::{{closure}}::hca231fc101b3e6fd 9: 0x7f422ac1e4d9 - std::sys::backtrace::__rust_end_short_backtrace::h06926a2e2943ba89 10: 0x7f422ac00d2d - __rustc[b1c59c6436b5ca6d]::rust_begin_unwind 11: 0x7f42272d97c0 - core::panicking::panic_fmt::h70c2893dd3ea1174 12: 0x7f422b4fdbc5 - <rustc_trait_selection[7bb7270748d17f26]::traits::select::SelectionContext>::select 13: 0x7f422bed840a - rustc_traits[53197189e8c6aec]::codegen::codegen_select_candidate 14: 0x7f422bed7fbf - rustc_query_impl[8928d0cdc353bfd3]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[8928d0cdc353bfd3]::query_impl::codegen_select_candidate::dynamic_query::{closure#2}::{closure#0}, rustc_middle[2606eb7ae987f1da]::query::erase::Erased<[u8; 16usize]>> 15: 0x7f422bed7052 - rustc_query_system[e45dfb2f5b784721]::query::plumbing::try_execute_query::<rustc_query_impl[8928d0cdc353bfd3]::DynamicConfig<rustc_query_system[e45dfb2f5b784721]::query::caches::DefaultCache<rustc_middle[2606eb7ae987f1da]::ty::PseudoCanonicalInput<rustc_type_ir[17415670be52970c]::predicate::TraitRef<rustc_middle[2606eb7ae987f1da]::ty::context::TyCtxt>>, rustc_middle[2606eb7ae987f1da]::query::erase::Erased<[u8; 16usize]>>, false, false, false>, rustc_query_impl[8928d0cdc353bfd3]::plumbing::QueryCtxt, false> 16: 0x7f422bed6ca3 - rustc_query_impl[8928d0cdc353bfd3]::query_impl::codegen_select_candidate::get_query_non_incr::__rust_end_short_backtrace 17: 0x7f422bece54f - rustc_ty_utils[d13c0d01f6c92fe0]::instance::resolve_instance_raw 18: 0x7f422beccef4 - rustc_query_impl[8928d0cdc353bfd3]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[8928d0cdc353bfd3]::query_impl::resolve_instance_raw::dynamic_query::{closure#2}::{closure#0}, rustc_middle[2606eb7ae987f1da]::query::erase::Erased<[u8; 32usize]>> 19: 0x7f422becc004 - rustc_query_system[e45dfb2f5b784721]::query::plumbing::try_execute_query::<rustc_query_impl[8928d0cdc353bfd3]::DynamicConfig<rustc_query_system[e45dfb2f5b784721]::query::caches::DefaultCache<rustc_middle[2606eb7ae987f1da]::ty::PseudoCanonicalInput<(rustc_span[8e02ed64795c0821]::def_id::DefId, &rustc_middle[2606eb7ae987f1da]::ty::list::RawList<(), rustc_middle[2606eb7ae987f1da]::ty::generic_args::GenericArg>)>, rustc_middle[2606eb7ae987f1da]::query::erase::Erased<[u8; 32usize]>>, false, false, false>, rustc_query_impl[8928d0cdc353bfd3]::plumbing::QueryCtxt, false> 20: 0x7f422becbc33 - rustc_query_impl[8928d0cdc353bfd3]::query_impl::resolve_instance_raw::get_query_non_incr::__rust_end_short_backtrace 21: 0x7f422b434392 - <rustc_middle[2606eb7ae987f1da]::ty::instance::Instance>::try_resolve 22: 0x7f422a0e6943 - <rustc_lint[896ba270478ae47f]::internal::QueryStability as rustc_lint[896ba270478ae47f]::passes::LateLintPass>::check_expr 23: 0x7f422a0c9c8e - <rustc_lint[896ba270478ae47f]::late::LateContextAndPass<rustc_lint[896ba270478ae47f]::late::RuntimeCombinedLateLintPass> as rustc_hir[ce88ed2bdf186acf]::intravisit::Visitor>::visit_expr::{closure#0}::{closure#0} 24: 0x7f422a0ca73c - <rustc_lint[896ba270478ae47f]::late::LateContextAndPass<rustc_lint[896ba270478ae47f]::late::RuntimeCombinedLateLintPass> as rustc_hir[ce88ed2bdf186acf]::intravisit::Visitor>::visit_expr 25: 0x7f422a0c95a1 - <rustc_lint[896ba270478ae47f]::late::LateContextAndPass<rustc_lint[896ba270478ae47f]::late::RuntimeCombinedLateLintPass> as rustc_hir[ce88ed2bdf186acf]::intravisit::Visitor>::visit_block 26: 0x7f422a0ca380 - <rustc_lint[896ba270478ae47f]::late::LateContextAndPass<rustc_lint[896ba270478ae47f]::late::RuntimeCombinedLateLintPass> as rustc_hir[ce88ed2bdf186acf]::intravisit::Visitor>::visit_expr::{closure#0}::{closure#0} 27: 0x7f422a0ca73c - <rustc_lint[896ba270478ae47f]::late::LateContextAndPass<rustc_lint[896ba270478ae47f]::late::RuntimeCombinedLateLintPass> as rustc_hir[ce88ed2bdf186acf]::intravisit::Visitor>::visit_expr 28: 0x7f422a0cb30c - <rustc_lint[896ba270478ae47f]::late::LateContextAndPass<rustc_lint[896ba270478ae47f]::late::RuntimeCombinedLateLintPass> as rustc_hir[ce88ed2bdf186acf]::intravisit::Visitor>::visit_nested_body 29: 0x7f422a0c8b3e - <rustc_lint[896ba270478ae47f]::late::LateContextAndPass<rustc_lint[896ba270478ae47f]::late::RuntimeCombinedLateLintPass> as rustc_hir[ce88ed2bdf186acf]::intravisit::Visitor>::visit_fn 30: 0x7f422a0c85da - <rustc_lint[896ba270478ae47f]::late::LateContextAndPass<rustc_lint[896ba270478ae47f]::late::RuntimeCombinedLateLintPass> as rustc_hir[ce88ed2bdf186acf]::intravisit::Visitor>::visit_nested_item 31: 0x7f422a0c9670 - <rustc_lint[896ba270478ae47f]::late::LateContextAndPass<rustc_lint[896ba270478ae47f]::late::RuntimeCombinedLateLintPass> as rustc_hir[ce88ed2bdf186acf]::intravisit::Visitor>::visit_block 32: 0x7f422a0ca380 - <rustc_lint[896ba270478ae47f]::late::LateContextAndPass<rustc_lint[896ba270478ae47f]::late::RuntimeCombinedLateLintPass> as rustc_hir[ce88ed2bdf186acf]::intravisit::Visitor>::visit_expr::{closure#0}::{closure#0} 33: 0x7f422a0ca73c - <rustc_lint[896ba270478ae47f]::late::LateContextAndPass<rustc_lint[896ba270478ae47f]::late::RuntimeCombinedLateLintPass> as rustc_hir[ce88ed2bdf186acf]::intravisit::Visitor>::visit_expr 34: 0x7f422a0cb30c - <rustc_lint[896ba270478ae47f]::late::LateContextAndPass<rustc_lint[896ba270478ae47f]::late::RuntimeCombinedLateLintPass> as rustc_hir[ce88ed2bdf186acf]::intravisit::Visitor>::visit_nested_body 35: 0x7f422a0c8b3e - <rustc_lint[896ba270478ae47f]::late::LateContextAndPass<rustc_lint[896ba270478ae47f]::late::RuntimeCombinedLateLintPass> as rustc_hir[ce88ed2bdf186acf]::intravisit::Visitor>::visit_fn 36: 0x7f422a0c85da - <rustc_lint[896ba270478ae47f]::late::LateContextAndPass<rustc_lint[896ba270478ae47f]::late::RuntimeCombinedLateLintPass> as rustc_hir[ce88ed2bdf186acf]::intravisit::Visitor>::visit_nested_item 37: 0x7f422bba5ffe - rustc_lint[896ba270478ae47f]::lint_mod 38: 0x7f422bba57f7 - rustc_query_impl[8928d0cdc353bfd3]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[8928d0cdc353bfd3]::query_impl::lint_mod::dynamic_query::{closure#2}::{closure#0}, rustc_middle[2606eb7ae987f1da]::query::erase::Erased<[u8; 0usize]>> 39: 0x7f422c22f9b2 - rustc_query_system[e45dfb2f5b784721]::query::plumbing::try_execute_query::<rustc_query_impl[8928d0cdc353bfd3]::DynamicConfig<rustc_query_system[e45dfb2f5b784721]::query::caches::DefaultCache<rustc_span[8e02ed64795c0821]::def_id::LocalModDefId, rustc_middle[2606eb7ae987f1da]::query::erase::Erased<[u8; 0usize]>>, false, false, false>, rustc_query_impl[8928d0cdc353bfd3]::plumbing::QueryCtxt, false> 40: 0x7f422c22eb3d - rustc_query_impl[8928d0cdc353bfd3]::query_impl::lint_mod::get_query_non_incr::__rust_end_short_backtrace 41: 0x7f422c22e6a9 - rustc_lint[896ba270478ae47f]::late::check_crate::{closure#1} 42: 0x7f422c22e218 - rustc_lint[896ba270478ae47f]::late::check_crate 43: 0x7f422b6c0b7e - rustc_interface[633ffa5dc7bb5048]::passes::analysis 44: 0x7f422b6c030d - rustc_query_impl[8928d0cdc353bfd3]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[8928d0cdc353bfd3]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[2606eb7ae987f1da]::query::erase::Erased<[u8; 0usize]>> 45: 0x7f422c4a5a66 - rustc_query_system[e45dfb2f5b784721]::query::plumbing::try_execute_query::<rustc_query_impl[8928d0cdc353bfd3]::DynamicConfig<rustc_query_system[e45dfb2f5b784721]::query::caches::SingleCache<rustc_middle[2606eb7ae987f1da]::query::erase::Erased<[u8; 0usize]>>, false, false, false>, rustc_query_impl[8928d0cdc353bfd3]::plumbing::QueryCtxt, false> 46: 0x7f422c4a56bc - rustc_query_impl[8928d0cdc353bfd3]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace 47: 0x7f422c7c4f0b - rustc_interface[633ffa5dc7bb5048]::passes::create_and_enter_global_ctxt::<core[d99347adc0dbb9ec]::option::Option<rustc_interface[633ffa5dc7bb5048]::queries::Linker>, rustc_driver_impl[a32761b8ae1cc4b0]::run_compiler::{closure#0}::{closure#2}>::{closure#2}::{closure#0} 48: 0x7f422c68f0aa - rustc_interface[633ffa5dc7bb5048]::interface::run_compiler::<(), rustc_driver_impl[a32761b8ae1cc4b0]::run_compiler::{closure#0}>::{closure#1} 49: 0x7f422c550af8 - std[91586dded61bf123]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[633ffa5dc7bb5048]::util::run_in_thread_with_globals<rustc_interface[633ffa5dc7bb5048]::util::run_in_thread_pool_with_globals<rustc_interface[633ffa5dc7bb5048]::interface::run_compiler<(), rustc_driver_impl[a32761b8ae1cc4b0]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()> 50: 0x7f422c5507c8 - <<std[91586dded61bf123]::thread::Builder>::spawn_unchecked_<rustc_interface[633ffa5dc7bb5048]::util::run_in_thread_with_globals<rustc_interface[633ffa5dc7bb5048]::util::run_in_thread_pool_with_globals<rustc_interface[633ffa5dc7bb5048]::interface::run_compiler<(), rustc_driver_impl[a32761b8ae1cc4b0]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core[d99347adc0dbb9ec]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0} 51: 0x7f422c551acb - std::sys::pal::unix::thread::Thread::new::thread_start::hfdeae9c35d1c96b2 52: 0x7f4225c9caa4 - <unknown> 53: 0x7f4225d29c3c - <unknown> 54: 0x0 - <unknown> error: the compiler unexpectedly panicked. this is a bug. ``` **To Reproduce** Run MIRI **Expected behavior** <!-- A clear and concise description of what you expected to happen. --> **Additional context** <!-- Add any other context about the problem here. --> -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: github-unsubscr...@arrow.apache.org.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
