ICE has escaping bound vars, so it cannot be wrapped in a dummy binder. #134764
Description
auto-reduced (treereduce-rust):
#[derive(PartialEq, Eq)] enum O<T> { Some(*const T), None, } struct B; const C: &[O<Box<dyn for<'a> Fn(Box<dyn Fn() -> &'a isize>)>>] = &[O::None]; fn main() { let x = O::None; match &[x][..] { C => (), _ => (), } }original:
#[derive(PartialEq, Eq)] enum O<T> { Some(*const T), // Can also use PhantomData<T> None, } struct B; const C: &[O<Box<dyn for<'a> Fn(Box<dyn Fn(&'a isize) -> &'a isize>)>>] = &[O::None]; fn main() { let x = O::None; match &[x][..] { C => (), //~ ERROR constant of non-structural type `&[O<B>]` in a pattern _ => (), } }Version information
rustc 1.85.0-nightly (f432d5dcb 2024-12-25) binary: rustc commit-hash: f432d5dcb52db23aec88a1a22cc76f00addaf914 commit-date: 2024-12-25 host: x86_64-unknown-linux-gnu release: 1.85.0-nightly LLVM version: 19.1.6 Possibly related line of code:
rust/compiler/rustc_middle/src/ty/predicate.rs
Lines 527 to 539 in f432d5d
Command:
/home/matthias/.rustup/toolchains/master/bin/rustc
Program output
thread 'rustc' panicked at compiler/rustc_middle/src/ty/predicate.rs:533:9: `<std::boxed::Box<dyn std::ops::Fn() -> &'a isize> as std::cmp::PartialEq>` has escaping bound vars, so it cannot be wrapped in a dummy binder. stack backtrace: 0: 0x7c9cdfebb63a - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::h77fbdc8aac60414e 1: 0x7c9ce06138a6 - core::fmt::write::hda4d658b5ee55b01 2: 0x7c9ce153fd51 - std::io::Write::write_fmt::h8f90a5c3ff9cbbf5 3: 0x7c9cdfebb492 - std::sys::backtrace::BacktraceLock::print::h3ad93e09de443a12 4: 0x7c9cdfebd98a - std::panicking::default_hook::{{closure}}::h6fc4ea29ea465f34 5: 0x7c9cdfebd7d3 - std::panicking::default_hook::h464057d7719def3c 6: 0x7c9cdf0297b8 - std[fa56bee34f8ed8e9]::panicking::update_hook::<alloc[f57ddff3f4a06127]::boxed::Box<rustc_driver_impl[d4ab4eea49657f86]::install_ice_hook::{closure#0}>>::{closure#0} 7: 0x7c9cdfebe148 - std::panicking::rust_panic_with_hook::h2040cc9aadf33ebd 8: 0x7c9cdfebde3a - std::panicking::begin_panic_handler::{{closure}}::hd0d95548d1502188 9: 0x7c9cdfebbad9 - std::sys::backtrace::__rust_end_short_backtrace::h62d4821eb41cd40b 10: 0x7c9cdfebdafd - rust_begin_unwind 11: 0x7c9cdcb9aae0 - core::panicking::panic_fmt::hf6e7a6562922f7a8 12: 0x7c9ce1368ad9 - rustc_mir_build[99939e59f9e176fb]::thir::pattern::const_to_pat::type_has_partial_eq_impl 13: 0x7c9cdf6be7be - <rustc_mir_build[99939e59f9e176fb]::thir::pattern::const_to_pat::extend_type_not_partial_eq::UsedParamsNeedInstantiationVisitor as rustc_type_ir[5e65a3934537d3cf]::visit::TypeVisitor<rustc_middle[c9a7fc339c28ab7c]::ty::context::TyCtxt>>::visit_ty 14: 0x7c9cdf6be9b0 - <rustc_mir_build[99939e59f9e176fb]::thir::pattern::const_to_pat::extend_type_not_partial_eq::UsedParamsNeedInstantiationVisitor as rustc_type_ir[5e65a3934537d3cf]::visit::TypeVisitor<rustc_middle[c9a7fc339c28ab7c]::ty::context::TyCtxt>>::visit_ty 15: 0x7c9cdf6bea40 - <rustc_mir_build[99939e59f9e176fb]::thir::pattern::const_to_pat::extend_type_not_partial_eq::UsedParamsNeedInstantiationVisitor as rustc_type_ir[5e65a3934537d3cf]::visit::TypeVisitor<rustc_middle[c9a7fc339c28ab7c]::ty::context::TyCtxt>>::visit_ty 16: 0x7c9cdf6be7ec - <rustc_mir_build[99939e59f9e176fb]::thir::pattern::const_to_pat::extend_type_not_partial_eq::UsedParamsNeedInstantiationVisitor as rustc_type_ir[5e65a3934537d3cf]::visit::TypeVisitor<rustc_middle[c9a7fc339c28ab7c]::ty::context::TyCtxt>>::visit_ty 17: 0x7c9cdf6be7ec - <rustc_mir_build[99939e59f9e176fb]::thir::pattern::const_to_pat::extend_type_not_partial_eq::UsedParamsNeedInstantiationVisitor as rustc_type_ir[5e65a3934537d3cf]::visit::TypeVisitor<rustc_middle[c9a7fc339c28ab7c]::ty::context::TyCtxt>>::visit_ty 18: 0x7c9ce1366943 - <rustc_mir_build[99939e59f9e176fb]::thir::pattern::PatCtxt>::const_to_pat 19: 0x7c9ce100d185 - <rustc_mir_build[99939e59f9e176fb]::thir::pattern::PatCtxt>::lower_path 20: 0x7c9ce100a2ed - <rustc_mir_build[99939e59f9e176fb]::thir::pattern::PatCtxt>::lower_pattern 21: 0x7c9ce1009246 - <rustc_mir_build[99939e59f9e176fb]::thir::cx::Cx>::pattern_from_hir 22: 0x7c9ce0ff99c0 - <rustc_mir_build[99939e59f9e176fb]::thir::cx::Cx>::mirror_expr 23: 0x7c9ce0ff953c - <rustc_mir_build[99939e59f9e176fb]::thir::cx::Cx>::mirror_expr 24: 0x7c9ce1007826 - rustc_mir_build[99939e59f9e176fb]::thir::cx::thir_body 25: 0x7c9ce10072ac - rustc_query_impl[4bd01d47c4af37a7]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[4bd01d47c4af37a7]::query_impl::thir_body::dynamic_query::{closure#2}::{closure#0}, rustc_middle[c9a7fc339c28ab7c]::query::erase::Erased<[u8; 16usize]>> 26: 0x7c9ce0a5ff0a - rustc_query_system[62fa8c3d1f26fee8]::query::plumbing::try_execute_query::<rustc_query_impl[4bd01d47c4af37a7]::DynamicConfig<rustc_data_structures[610240d0a6b991ea]::vec_cache::VecCache<rustc_span[634eed359c297ed]::def_id::LocalDefId, rustc_middle[c9a7fc339c28ab7c]::query::erase::Erased<[u8; 16usize]>, rustc_query_system[62fa8c3d1f26fee8]::dep_graph::graph::DepNodeIndex>, false, false, false>, rustc_query_impl[4bd01d47c4af37a7]::plumbing::QueryCtxt, false> 27: 0x7c9ce0a5fa6c - rustc_query_impl[4bd01d47c4af37a7]::query_impl::thir_body::get_query_non_incr::__rust_end_short_backtrace 28: 0x7c9cdd7723a7 - rustc_mir_build[99939e59f9e176fb]::check_unsafety::check_unsafety 29: 0x7c9ce0e812bd - rustc_query_impl[4bd01d47c4af37a7]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[4bd01d47c4af37a7]::query_impl::check_unsafety::dynamic_query::{closure#2}::{closure#0}, rustc_middle[c9a7fc339c28ab7c]::query::erase::Erased<[u8; 0usize]>> 30: 0x7c9ce0e81569 - rustc_query_system[62fa8c3d1f26fee8]::query::plumbing::try_execute_query::<rustc_query_impl[4bd01d47c4af37a7]::DynamicConfig<rustc_data_structures[610240d0a6b991ea]::vec_cache::VecCache<rustc_span[634eed359c297ed]::def_id::LocalDefId, rustc_middle[c9a7fc339c28ab7c]::query::erase::Erased<[u8; 0usize]>, rustc_query_system[62fa8c3d1f26fee8]::dep_graph::graph::DepNodeIndex>, false, false, false>, rustc_query_impl[4bd01d47c4af37a7]::plumbing::QueryCtxt, false> 31: 0x7c9ce0e81201 - rustc_query_impl[4bd01d47c4af37a7]::query_impl::check_unsafety::get_query_non_incr::__rust_end_short_backtrace 32: 0x7c9ce0b37200 - rustc_interface[a43870bf5b30678c]::passes::run_required_analyses 33: 0x7c9ce1543bde - rustc_interface[a43870bf5b30678c]::passes::analysis 34: 0x7c9ce1543baf - rustc_query_impl[4bd01d47c4af37a7]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[4bd01d47c4af37a7]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[c9a7fc339c28ab7c]::query::erase::Erased<[u8; 0usize]>> 35: 0x7c9ce1586c15 - rustc_query_system[62fa8c3d1f26fee8]::query::plumbing::try_execute_query::<rustc_query_impl[4bd01d47c4af37a7]::DynamicConfig<rustc_query_system[62fa8c3d1f26fee8]::query::caches::SingleCache<rustc_middle[c9a7fc339c28ab7c]::query::erase::Erased<[u8; 0usize]>>, false, false, false>, rustc_query_impl[4bd01d47c4af37a7]::plumbing::QueryCtxt, false> 36: 0x7c9ce158694e - rustc_query_impl[4bd01d47c4af37a7]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace 37: 0x7c9ce1644f1e - rustc_interface[a43870bf5b30678c]::passes::create_and_enter_global_ctxt::<core[f39fba3432b64bbd]::option::Option<rustc_interface[a43870bf5b30678c]::queries::Linker>, rustc_driver_impl[d4ab4eea49657f86]::run_compiler::{closure#0}::{closure#2}>::{closure#2}::{closure#0} 38: 0x7c9ce15b0c64 - rustc_interface[a43870bf5b30678c]::interface::run_compiler::<(), rustc_driver_impl[d4ab4eea49657f86]::run_compiler::{closure#0}>::{closure#1} 39: 0x7c9ce14b9487 - std[fa56bee34f8ed8e9]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[a43870bf5b30678c]::util::run_in_thread_with_globals<rustc_interface[a43870bf5b30678c]::util::run_in_thread_pool_with_globals<rustc_interface[a43870bf5b30678c]::interface::run_compiler<(), rustc_driver_impl[d4ab4eea49657f86]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()> 40: 0x7c9ce14b991c - <<std[fa56bee34f8ed8e9]::thread::Builder>::spawn_unchecked_<rustc_interface[a43870bf5b30678c]::util::run_in_thread_with_globals<rustc_interface[a43870bf5b30678c]::util::run_in_thread_pool_with_globals<rustc_interface[a43870bf5b30678c]::interface::run_compiler<(), rustc_driver_impl[d4ab4eea49657f86]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core[f39fba3432b64bbd]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0} 41: 0x7c9ce14baeef - std::sys::pal::unix::thread::Thread::new::thread_start::hd34f2ad132c4e652 42: 0x7c9cdb8a339d - <unknown> 43: 0x7c9cdb92849c - <unknown> 44: 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: please make sure that you have updated to the latest nightly note: rustc 1.85.0-nightly (f432d5dcb 2024-12-25) running on x86_64-unknown-linux-gnu query stack during panic: #0 [thir_body] building THIR for `main` #1 [check_unsafety] unsafety-checking `main` end of query stack