warning: the feature `loop_match` is incomplete and may not be safe to use and/or cause compiler crashes
 --> <crate attribute>:1:12
 |
1 | #![feature(loop_match)]
 | ^^^^^^^^^^
 |
 = note: see issue #132306 <https://github.com/rust-lang/rust/issues/132306> for more information
 = note: `#[warn(incomplete_features)]` on by default
warning: unused label
 --> /tmp/icemaker_global_tempdir.Mh0izylGtxSo/rustc_testrunner_tmpdir_reporting.mzbHvU9juaja/mvce.rs:6:17
 |
6 | state = 'blk: {
 | ^^^^
 |
 = note: `#[warn(unused_labels)]` on by default
warning: variable does not need to be mutable
 --> /tmp/icemaker_global_tempdir.Mh0izylGtxSo/rustc_testrunner_tmpdir_reporting.mzbHvU9juaja/mvce.rs:3:9
 |
3 | fn test(mut state: u8) {
 | ----^^^^^
 | |
 | help: remove this `mut`
 |
 = note: `#[warn(unused_mut)]` on by default
warning: function `test` is never used
 --> /tmp/icemaker_global_tempdir.Mh0izylGtxSo/rustc_testrunner_tmpdir_reporting.mzbHvU9juaja/mvce.rs:3:4
 |
3 | fn test(mut state: u8) {
 | ^^^^
 |
 = note: `#[warn(dead_code)]` on by default
warning: variable `ARRAY` should have a snake case name
 --> /tmp/icemaker_global_tempdir.Mh0izylGtxSo/rustc_testrunner_tmpdir_reporting.mzbHvU9juaja/mvce.rs:8:17
 |
8 | ARRAY => dbg!(ARRAY),
 | ^^^^^ help: convert the identifier to snake case: `array`
 |
 = note: `#[warn(non_snake_case)]` on by default
warning: 5 warnings emitted
note: no errors encountered even though delayed bugs were created
note: those delayed bugs will now be shown as internal compiler errors
error: internal compiler error: broken MIR in DefId(0:3 ~ mvce[7ffe]::test) (_2 = copy _4): bad assignment (! = u8): NoSolution
 --> /tmp/icemaker_global_tempdir.Mh0izylGtxSo/rustc_testrunner_tmpdir_reporting.mzbHvU9juaja/mvce.rs:8:26
 |
8 | ARRAY => dbg!(ARRAY),
 | ^^^^^^^^^^^
 |
note: delayed at compiler/rustc_borrowck/src/type_check/mod.rs:662:21
 0: <rustc_errors::DiagCtxtInner>::emit_diagnostic
 1: <rustc_errors::DiagCtxtHandle>::emit_diagnostic
 2: <rustc_span::ErrorGuaranteed as rustc_errors::diagnostic::EmissionGuarantee>::emit_producing_guarantee
 3: <rustc_errors::DiagCtxtHandle>::span_delayed_bug::<rustc_span::span_encoding::Span, alloc::string::String>
 4: <rustc_borrowck::type_check::TypeChecker as rustc_middle::mir::visit::Visitor>::visit_body
 5: rustc_borrowck::type_check::type_check
 6: rustc_borrowck::do_mir_borrowck
 7: rustc_borrowck::mir_borrowck
 8: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::mir_borrowck::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 8]>>
 9: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_data_structures::vec_cache::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::Erased<[u8; 8]>, rustc_query_system::dep_graph::graph::DepNodeIndex>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
 10: rustc_query_impl::query_impl::mir_borrowck::get_query_non_incr::__rust_end_short_backtrace
 11: <rustc_middle::ty::context::TyCtxt>::par_hir_body_owners::<rustc_interface::passes::run_required_analyses::{closure#1}::{closure#0}>::{closure#0}
 12: rustc_interface::passes::analysis
 13: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 0]>>
 14: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::SingleCache<rustc_middle::query::erase::Erased<[u8; 0]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
 15: rustc_query_impl::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
 16: 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}
 17: rustc_interface::interface::run_compiler::<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}
 18: std::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
 19: <<std::thread::Builder>::spawn_unchecked_<rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
 20: std::sys::pal::unix::thread::Thread::new::thread_start
 21: <unknown>
 22: <unknown>
 --> /tmp/icemaker_global_tempdir.Mh0izylGtxSo/rustc_testrunner_tmpdir_reporting.mzbHvU9juaja/mvce.rs:8:26
 |
8 | ARRAY => dbg!(ARRAY),
 | ^^^^^^^^^^^
 = note: this error: internal compiler error originates in the macro `dbg` (in Nightly builds, run with -Z macro-backtrace for more info)
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 1.90.0-nightly (f32b23204 2025年07月26日) running on x86_64-unknown-linux-gnu
note: compiler flags: -Z crate-attr=feature(loop_match) -Z dump-mir-dir=dir
query stack during panic:
end of query stack