error[E0425]: cannot find value `target` in this scope
 --> /tmp/icemaker_global_tempdir.1khAqktZak0k/rustc_testrunner_tmpdir_reporting.F2c9o1Y4kXrG/mvce.rs:3:9
  |
3 |         target
  |         ^^^^^^ not found in this scope
...
8 |     let val: [str; len!()] = [];
  |                    ------ in this macro invocation
  |
  = note: this error originates in the macro `len` (in Nightly builds, run with -Z macro-backtrace for more info)

thread 'rustc' panicked at compiler/rustc_ast_lowering/src/lib.rs:503:9:
adding a def'n for node-id NodeId(18) and def kind AnonConst but a previous def'n exists: DefKey { parent: Some(DefIndex(4)), disambiguated_data: DisambiguatedDefPathData { data: AnonConst, disambiguator: 0 } }
stack backtrace:
   0:     0x7e8412c083a5 - std::backtrace_rs::backtrace::libunwind::trace::h160e615c518ecb01
                               at /rustc/2e6fc425411280c658d852813de01c5157255088/library/std/src/../../backtrace/src/backtrace/libunwind.rs:116:5
   1:     0x7e8412c083a5 - std::backtrace_rs::backtrace::trace_unsynchronized::he30c6d2f98d2efdc
                               at /rustc/2e6fc425411280c658d852813de01c5157255088/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7e8412c083a5 - std::sys::backtrace::_print_fmt::hb87cad28f2e90a0b
                               at /rustc/2e6fc425411280c658d852813de01c5157255088/library/std/src/sys/backtrace.rs:65:5
   3:     0x7e8412c083a5 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::h362429114acc76fb
                               at /rustc/2e6fc425411280c658d852813de01c5157255088/library/std/src/sys/backtrace.rs:40:26
   4:     0x7e8412c57eab - core::fmt::rt::Argument::fmt::h2dd3e5813b018ccc
                               at /rustc/2e6fc425411280c658d852813de01c5157255088/library/core/src/fmt/rt.rs:173:76
   5:     0x7e8412c57eab - core::fmt::write::haceebbcd70688c9b
                               at /rustc/2e6fc425411280c658d852813de01c5157255088/library/core/src/fmt/mod.rs:1182:21
   6:     0x7e8412bfce7f - std::io::Write::write_fmt::h7c7b83fdf5105f1d
                               at /rustc/2e6fc425411280c658d852813de01c5157255088/library/std/src/io/mod.rs:1827:15
   7:     0x7e8412c0ab91 - std::sys::backtrace::BacktraceLock::print::hd97590b35fdf3d35
                               at /rustc/2e6fc425411280c658d852813de01c5157255088/library/std/src/sys/backtrace.rs:43:9
   8:     0x7e8412c0ab91 - std::panicking::default_hook::{{closure}}::h587635c60073753d
                               at /rustc/2e6fc425411280c658d852813de01c5157255088/library/std/src/panicking.rs:269:22
   9:     0x7e8412c0a86c - std::panicking::default_hook::h41bedcdd5e6a0e44
                               at /rustc/2e6fc425411280c658d852813de01c5157255088/library/std/src/panicking.rs:296:9
  10:     0x7e840f024e1a - std[f9e60369e5bdbf77]::panicking::update_hook::<alloc[f72c5bad8b9f51f]::boxed::Box<rustc_driver_impl[23129d3f9f762646]::install_ice_hook::{closure#0}>>::{closure#0}
  11:     0x7e8412c0b55f - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h7651476b4c558d70
                               at /rustc/2e6fc425411280c658d852813de01c5157255088/library/alloc/src/boxed.rs:2084:9
  12:     0x7e8412c0b55f - std::panicking::rust_panic_with_hook::heee9f152ffb5d0c8
                               at /rustc/2e6fc425411280c658d852813de01c5157255088/library/std/src/panicking.rs:808:13
  13:     0x7e8412c0b187 - std::panicking::begin_panic_handler::{{closure}}::h808b135ae5150977
                               at /rustc/2e6fc425411280c658d852813de01c5157255088/library/std/src/panicking.rs:674:13
  14:     0x7e8412c08869 - std::sys::backtrace::__rust_end_short_backtrace::h3c8a02e9918c1a26
                               at /rustc/2e6fc425411280c658d852813de01c5157255088/library/std/src/sys/backtrace.rs:168:18
  15:     0x7e8412c0ae14 - rust_begin_unwind
                               at /rustc/2e6fc425411280c658d852813de01c5157255088/library/std/src/panicking.rs:665:5
  16:     0x7e8412c54463 - core::panicking::panic_fmt::h124ff2929e2b97c8
                               at /rustc/2e6fc425411280c658d852813de01c5157255088/library/core/src/panicking.rs:74:14
  17:     0x7e8412045276 - <rustc_ast_lowering[d5c02056e301041c]::LoweringContext>::create_def.cold
  18:     0x7e8410ccdfdd - <rustc_ast_lowering[d5c02056e301041c]::LoweringContext>::lower_anon_const_to_anon_const
  19:     0x7e8410ccdc72 - <rustc_ast_lowering[d5c02056e301041c]::LoweringContext>::lower_anon_const_to_const_arg_direct
  20:     0x7e8410ccd9f3 - <rustc_ast_lowering[d5c02056e301041c]::LoweringContext>::lower_array_length
  21:     0x7e8410cf9b8f - <rustc_ast_lowering[d5c02056e301041c]::LoweringContext>::lower_ty_direct
  22:     0x7e8410cae238 - <rustc_ast_lowering[d5c02056e301041c]::LoweringContext>::lower_block_noalloc
  23:     0x7e8410cd4d10 - <rustc_ast_lowering[d5c02056e301041c]::LoweringContext>::lower_maybe_coroutine_body
  24:     0x7e8410cee69f - <rustc_ast_lowering[d5c02056e301041c]::LoweringContext>::lower_item_kind
  25:     0x7e8410cd215f - <rustc_ast_lowering[d5c02056e301041c]::item::ItemLowerer>::lower_node
  26:     0x7e8410ccfb79 - rustc_ast_lowering[d5c02056e301041c]::lower_to_hir
  27:     0x7e84114c5260 - rustc_query_impl[7076d3a069d488ea]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[7076d3a069d488ea]::query_impl::hir_crate::dynamic_query::{closure#2}::{closure#0}, rustc_middle[f5371164b7025427]::query::erase::Erased<[u8; 8usize]>>
  28:     0x7e84114c2302 - rustc_query_system[eb2b374bcd8a9022]::query::plumbing::try_execute_query::<rustc_query_impl[7076d3a069d488ea]::DynamicConfig<rustc_query_system[eb2b374bcd8a9022]::query::caches::SingleCache<rustc_middle[f5371164b7025427]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[7076d3a069d488ea]::plumbing::QueryCtxt, false>
  29:     0x7e84114c1f1e - rustc_query_impl[7076d3a069d488ea]::query_impl::hir_crate::get_query_non_incr::__rust_end_short_backtrace
  30:     0x7e8410e9a064 - rustc_query_impl[7076d3a069d488ea]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[7076d3a069d488ea]::query_impl::hir_attrs::dynamic_query::{closure#2}::{closure#0}, rustc_middle[f5371164b7025427]::query::erase::Erased<[u8; 8usize]>>
  31:     0x7e8410e9961f - rustc_query_system[eb2b374bcd8a9022]::query::plumbing::try_execute_query::<rustc_query_impl[7076d3a069d488ea]::DynamicConfig<rustc_query_system[eb2b374bcd8a9022]::query::caches::VecCache<rustc_hir[2699c16870db6088]::hir_id::OwnerId, rustc_middle[f5371164b7025427]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[7076d3a069d488ea]::plumbing::QueryCtxt, false>
  32:     0x7e8410e9938f - rustc_query_impl[7076d3a069d488ea]::query_impl::hir_attrs::get_query_non_incr::__rust_end_short_backtrace
  33:     0x7e8410878006 - <rustc_middle[f5371164b7025427]::hir::map::Map>::attrs
  34:     0x7e84117af401 - rustc_passes[141401c4575c1f66]::entry::entry_fn
  35:     0x7e84117af398 - rustc_query_impl[7076d3a069d488ea]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[7076d3a069d488ea]::query_impl::entry_fn::dynamic_query::{closure#2}::{closure#0}, rustc_middle[f5371164b7025427]::query::erase::Erased<[u8; 12usize]>>
  36:     0x7e84117af36f - <rustc_query_impl[7076d3a069d488ea]::query_impl::entry_fn::dynamic_query::{closure#2} as core[c927cdc4da4eb0de]::ops::function::FnOnce<(rustc_middle[f5371164b7025427]::ty::context::TyCtxt, ())>>::call_once
  37:     0x7e84117aec88 - rustc_query_system[eb2b374bcd8a9022]::query::plumbing::try_execute_query::<rustc_query_impl[7076d3a069d488ea]::DynamicConfig<rustc_query_system[eb2b374bcd8a9022]::query::caches::SingleCache<rustc_middle[f5371164b7025427]::query::erase::Erased<[u8; 12usize]>>, false, false, false>, rustc_query_impl[7076d3a069d488ea]::plumbing::QueryCtxt, false>
  38:     0x7e84117aea29 - rustc_query_impl[7076d3a069d488ea]::query_impl::entry_fn::get_query_non_incr::__rust_end_short_backtrace
  39:     0x7e8410b0ffb2 - rustc_interface[635a4d36e766d1e0]::passes::analysis
  40:     0x7e8410b0fdc7 - rustc_query_impl[7076d3a069d488ea]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[7076d3a069d488ea]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[f5371164b7025427]::query::erase::Erased<[u8; 1usize]>>
  41:     0x7e84114c3725 - rustc_query_system[eb2b374bcd8a9022]::query::plumbing::try_execute_query::<rustc_query_impl[7076d3a069d488ea]::DynamicConfig<rustc_query_system[eb2b374bcd8a9022]::query::caches::SingleCache<rustc_middle[f5371164b7025427]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[7076d3a069d488ea]::plumbing::QueryCtxt, false>
  42:     0x7e84114c348f - rustc_query_impl[7076d3a069d488ea]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  43:     0x7e84114002c5 - rustc_interface[635a4d36e766d1e0]::interface::run_compiler::<core[c927cdc4da4eb0de]::result::Result<(), rustc_span[8f3a5487dfe29266]::ErrorGuaranteed>, rustc_driver_impl[23129d3f9f762646]::run_compiler::{closure#0}>::{closure#1}
  44:     0x7e8411394189 - std[f9e60369e5bdbf77]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[635a4d36e766d1e0]::util::run_in_thread_with_globals<rustc_interface[635a4d36e766d1e0]::util::run_in_thread_pool_with_globals<rustc_interface[635a4d36e766d1e0]::interface::run_compiler<core[c927cdc4da4eb0de]::result::Result<(), rustc_span[8f3a5487dfe29266]::ErrorGuaranteed>, rustc_driver_impl[23129d3f9f762646]::run_compiler::{closure#0}>::{closure#1}, core[c927cdc4da4eb0de]::result::Result<(), rustc_span[8f3a5487dfe29266]::ErrorGuaranteed>>::{closure#0}, core[c927cdc4da4eb0de]::result::Result<(), rustc_span[8f3a5487dfe29266]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[c927cdc4da4eb0de]::result::Result<(), rustc_span[8f3a5487dfe29266]::ErrorGuaranteed>>
  45:     0x7e8411393f3a - <<std[f9e60369e5bdbf77]::thread::Builder>::spawn_unchecked_<rustc_interface[635a4d36e766d1e0]::util::run_in_thread_with_globals<rustc_interface[635a4d36e766d1e0]::util::run_in_thread_pool_with_globals<rustc_interface[635a4d36e766d1e0]::interface::run_compiler<core[c927cdc4da4eb0de]::result::Result<(), rustc_span[8f3a5487dfe29266]::ErrorGuaranteed>, rustc_driver_impl[23129d3f9f762646]::run_compiler::{closure#0}>::{closure#1}, core[c927cdc4da4eb0de]::result::Result<(), rustc_span[8f3a5487dfe29266]::ErrorGuaranteed>>::{closure#0}, core[c927cdc4da4eb0de]::result::Result<(), rustc_span[8f3a5487dfe29266]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[c927cdc4da4eb0de]::result::Result<(), rustc_span[8f3a5487dfe29266]::ErrorGuaranteed>>::{closure#1} as core[c927cdc4da4eb0de]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  46:     0x7e8412c155bb - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::haeea406f77e87cac
                               at /rustc/2e6fc425411280c658d852813de01c5157255088/library/alloc/src/boxed.rs:2070:9
  47:     0x7e8412c155bb - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h024bb75f9bcc5dfb
                               at /rustc/2e6fc425411280c658d852813de01c5157255088/library/alloc/src/boxed.rs:2070:9
  48:     0x7e8412c155bb - std::sys::pal::unix::thread::Thread::new::thread_start::h106d07b62ccda4e0
                               at /rustc/2e6fc425411280c658d852813de01c5157255088/library/std/src/sys/pal/unix/thread.rs:108:17
  49:     0x7e84129a9ded - <unknown>
  50:     0x7e8412a2d0dc - <unknown>
  51:                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 1.81.0-nightly (2e6fc4254 2024-07-20) running on x86_64-unknown-linux-gnu

query stack during panic:
#0 [hir_crate] getting the crate HIR
#1 [hir_attrs] getting HIR owner attributes in ``
end of query stack
error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0425`.