error: `cfg` is not followed by parentheses --> /tmp/icemaker_global_tempdir.TKUrz1r4Ivcl/rustc_testrunner_tmpdir_reporting.zI5VU3Z1dC85/mvce.rs:3:5 | 3 | #[cfg] | ^^^^^^ help: expected syntax is: `cfg(/* predicate */)` warning: attribute is ignored here --> /tmp/icemaker_global_tempdir.TKUrz1r4Ivcl/rustc_testrunner_tmpdir_reporting.zI5VU3Z1dC85/mvce.rs:2:5 | 2 | #[deprecated = "oh no"] | ^^^^^^^^^^^^^^^^^^^^^^^ | = note: `#[warn(unused_attributes)]` on by default thread 'rustc' panicked at compiler/rustc_hir/src/hir.rs:1353:18: explicit panic stack backtrace: 0: 0x71cd8eaff733 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::hf6b8e560b2aaddbb 1: 0x71cd8f202cb7 - core::fmt::write::h512536cc11a37f1b 2: 0x71cd8eaf5263 - std::io::Write::write_fmt::h187d52edf76d8022 3: 0x71cd8eaff592 - std::sys::backtrace::BacktraceLock::print::h35718979b39d7a33 4: 0x71cd8eb0317a - std::panicking::default_hook::{{closure}}::hc9d1a33dc3084210 5: 0x71cd8eb02cff - std::panicking::default_hook::hd6f81cf0b769b874 6: 0x71cd8dbfbfd3 - std[9333bc5333c76994]::panicking::update_hook::<alloc[b28f35111b9cd925]::boxed::Box<rustc_driver_impl[9c8bc2fa3092ec28]::install_ice_hook::{closure#1}>>::{closure#0} 7: 0x71cd8eb039e3 - std::panicking::rust_panic_with_hook::hfaae9da84f44c762 8: 0x71cd8eb036da - std::panicking::begin_panic_handler::{{closure}}::h388c7963d93cd2b7 9: 0x71cd8eaffc09 - std::sys::backtrace::__rust_end_short_backtrace::h47ca3b58dfe8fab9 10: 0x71cd8eb033ad - __rustc[871f36a778bdfc9]::rust_begin_unwind 11: 0x71cd8b295b00 - core::panicking::panic_fmt::h82d75da6f9ebf9a2 12: 0x71cd8d5e5686 - core::panicking::panic_explicit::hd3af6f8734692b01 13: 0x71cd8c6c5197 - <rustc_hir[b1a3cee99d54fa36]::hir::Attribute as rustc_ast[528e74ef4f3ffeec]::attr::AttributeExt>::style::panic_cold_explicit 14: 0x71cd8dcbf9f3 - <rustc_hir[b1a3cee99d54fa36]::hir::Expr>::precedence::{closure#0}::{closure#0} 15: 0x71cd911944cd - <rustc_hir_typeck[8542d075aaf85410]::fn_ctxt::FnCtxt>::precedence::{closure#0}.llvm.3780047115223620710.cold 16: 0x71cd8fefa582 - <rustc_hir[b1a3cee99d54fa36]::hir::Expr>::precedence 17: 0x71cd8df03f43 - <rustc_hir_typeck[8542d075aaf85410]::fn_ctxt::FnCtxt>::suggest_deref_ref_or_into 18: 0x71cd8debff43 - <rustc_hir_typeck[8542d075aaf85410]::fn_ctxt::FnCtxt>::emit_type_mismatch_suggestions 19: 0x71cd8dec54ae - <rustc_hir_typeck[8542d075aaf85410]::fn_ctxt::FnCtxt>::emit_coerce_suggestions 20: 0x71cd8fb50daa - <rustc_hir_typeck[8542d075aaf85410]::fn_ctxt::FnCtxt>::check_expr_block 21: 0x71cd8fbb24e7 - <rustc_hir_typeck[8542d075aaf85410]::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args 22: 0x71cd8fb58334 - rustc_hir_typeck[8542d075aaf85410]::check::check_fn 23: 0x71cd903ec414 - rustc_hir_typeck[8542d075aaf85410]::typeck_with_inspect::{closure#0} 24: 0x71cd903d8a30 - rustc_query_impl[335bf943c842fa2e]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[335bf943c842fa2e]::query_impl::typeck::dynamic_query::{closure#2}::{closure#0}, rustc_middle[85dd1ff96372fcb9]::query::erase::Erased<[u8; 8usize]>> 25: 0x71cd8f440fee - rustc_query_system[f4098d1cf50ce8b4]::query::plumbing::try_execute_query::<rustc_query_impl[335bf943c842fa2e]::DynamicConfig<rustc_data_structures[f506b16921f7bc93]::vec_cache::VecCache<rustc_span[8686395707142f0d]::def_id::LocalDefId, rustc_middle[85dd1ff96372fcb9]::query::erase::Erased<[u8; 8usize]>, rustc_query_system[f4098d1cf50ce8b4]::dep_graph::graph::DepNodeIndex>, false, false, false>, rustc_query_impl[335bf943c842fa2e]::plumbing::QueryCtxt, false> 26: 0x71cd8f440a49 - rustc_query_impl[335bf943c842fa2e]::query_impl::typeck::get_query_non_incr::__rust_end_short_backtrace 27: 0x71cd8f449074 - rustc_hir_analysis[b968f598936cb41b]::check_crate 28: 0x71cd8faadae5 - rustc_interface[f2bb11eed659e555]::passes::analysis 29: 0x71cd8faad709 - rustc_query_impl[335bf943c842fa2e]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[335bf943c842fa2e]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[85dd1ff96372fcb9]::query::erase::Erased<[u8; 0usize]>> 30: 0x71cd9026674e - rustc_query_system[f4098d1cf50ce8b4]::query::plumbing::try_execute_query::<rustc_query_impl[335bf943c842fa2e]::DynamicConfig<rustc_query_system[f4098d1cf50ce8b4]::query::caches::SingleCache<rustc_middle[85dd1ff96372fcb9]::query::erase::Erased<[u8; 0usize]>>, false, false, false>, rustc_query_impl[335bf943c842fa2e]::plumbing::QueryCtxt, false> 31: 0x71cd90266336 - rustc_query_impl[335bf943c842fa2e]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace 32: 0x71cd90472d9c - rustc_interface[f2bb11eed659e555]::passes::create_and_enter_global_ctxt::<core[b2a367d0a99567d4]::option::Option<rustc_interface[f2bb11eed659e555]::queries::Linker>, rustc_driver_impl[9c8bc2fa3092ec28]::run_compiler::{closure#0}::{closure#2}>::{closure#2}::{closure#0} 33: 0x71cd90464149 - rustc_interface[f2bb11eed659e555]::interface::run_compiler::<(), rustc_driver_impl[9c8bc2fa3092ec28]::run_compiler::{closure#0}>::{closure#1} 34: 0x71cd904174b2 - std[9333bc5333c76994]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[f2bb11eed659e555]::util::run_in_thread_with_globals<rustc_interface[f2bb11eed659e555]::util::run_in_thread_pool_with_globals<rustc_interface[f2bb11eed659e555]::interface::run_compiler<(), rustc_driver_impl[9c8bc2fa3092ec28]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()> 35: 0x71cd90417196 - <<std[9333bc5333c76994]::thread::Builder>::spawn_unchecked_<rustc_interface[f2bb11eed659e555]::util::run_in_thread_with_globals<rustc_interface[f2bb11eed659e555]::util::run_in_thread_pool_with_globals<rustc_interface[f2bb11eed659e555]::interface::run_compiler<(), rustc_driver_impl[9c8bc2fa3092ec28]::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core[b2a367d0a99567d4]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0} 36: 0x71cd904157bd - std::sys::pal::unix::thread::Thread::new::thread_start::hd9016145e0d739a0 37: 0x71cd89ea57eb - <unknown> 38: 0x71cd89f2918c - <unknown> 39: 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 1.89.0-nightly (f3db63916 2025-06-17) running on x86_64-unknown-linux-gnu query stack during panic: #0 [typeck] type-checking `main` #1 [analysis] running analysis passes on this crate end of query stack error: aborting due to 1 previous error; 1 warning emitted