ICE:called `Option::unwrap()` on a `None` value

[sososopy]

The code is generated by a fuzzer and reduced manually
Possible repetition with #129209

Code

struct A<const N: usize> {}
impl<const N: usize> Iterator for A<N> {
    fn next() -> [(); std::mem::size_of::<Option<Self::Item>>] {}
}
fn main() {}

Meta

rustc --version --verbose:

rustc 1.89.0-nightly (dcecb9917 2025-05-09)
binary: rustc
commit-hash: dcecb99176edf2eec51613730937d21cdd5c8f6e
commit-date: 2025-05-09
host: x86_64-pc-windows-msvc
release: 1.89.0-nightly
LLVM version: 20.1.4

Error output

error[E0186]: method `next` has a `&mut self` declaration in the trait, but not in the impl
    |
197 |     fn next() -> [(); std::mem::size_of::<Option<Self::Item>>] {}
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `&mut self` in impl
    |
    = note: `next` from trait: `fn(&mut Self) -> Option<<Self as Iterator>::Item>`

error[E0046]: not all trait items implemented, missing: `Item`
    |
196 | impl<const N: usize> Iterator for A<N> {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ missing `Item` in implementation
    |
    = help: implement the missing item: `type Item = /* Type */;`

error: generic `Self` types are currently not permitted in anonymous constants
    |
197 |     fn next() -> [(); std::mem::size_of::<Option<Self::Item>>] {}

Backtrace

thread 'rustc' panicked at compiler\rustc_middle\src\ty\sty.rs:364:36:
called `Option::unwrap()` on a `None` value
stack backtrace:
   0:     0x7ff96d220282 - std::backtrace_rs::backtrace::win64::trace
                               at /rustc/dcecb99176edf2eec51613730937d21cdd5c8f6e/library\std\src\..\..\backtrace\src\backtrace\win64.rs:85
   1:     0x7ff96d220282 - std::backtrace_rs::backtrace::trace_unsynchronized
                               at /rustc/dcecb99176edf2eec51613730937d21cdd5c8f6e/library\std\src\..\..\backtrace\src\backtrace\mod.rs:66
   2:     0x7ff96d220282 - std::sys::backtrace::_print_fmt
                               at /rustc/dcecb99176edf2eec51613730937d21cdd5c8f6e/library\std\src\sys\backtrace.rs:66
   3:     0x7ff96d220282 - std::sys::backtrace::impl$0::print::impl$0::fmt
                               at /rustc/dcecb99176edf2eec51613730937d21cdd5c8f6e/library\std\src\sys\backtrace.rs:39
   4:     0x7ff96d252aab - core::fmt::rt::Argument::fmt
                               at /rustc/dcecb99176edf2eec51613730937d21cdd5c8f6e/library\core\src\fmt\rt.rs:181
   5:     0x7ff96d252aab - core::fmt::write
                               at /rustc/dcecb99176edf2eec51613730937d21cdd5c8f6e/library\core\src\fmt\mod.rs:1446
   6:     0x7ff96d2160a7 - std::io::default_write_fmt
                               at /rustc/dcecb99176edf2eec51613730937d21cdd5c8f6e/library\std\src\io\mod.rs:639
   7:     0x7ff96d2160a7 - std::io::Write::write_fmt<std::sys::stdio::windows::Stderr>
                               at /rustc/dcecb99176edf2eec51613730937d21cdd5c8f6e/library\std\src\io\mod.rs:1914
   8:     0x7ff96d2200c5 - std::sys::backtrace::BacktraceLock::print
                               at /rustc/dcecb99176edf2eec51613730937d21cdd5c8f6e/library\std\src\sys\backtrace.rs:42
   9:     0x7ff96d225d4a - std::panicking::default_hook::closure$0
                               at /rustc/dcecb99176edf2eec51613730937d21cdd5c8f6e/library\std\src\panicking.rs:300
  10:     0x7ff96d225ae0 - std::panicking::default_hook
                               at /rustc/dcecb99176edf2eec51613730937d21cdd5c8f6e/library\std\src\panicking.rs:327
  11:     0x7ff96e9410bf - core[9d60ee0329d566fc]::slice::sort::unstable::heapsort::heapsort::<((rustc_lint_defs[748db264f8602b7b]::Level, &str), usize), <((rustc_lint_defs[748db264f8602b7b]::Level, &str), usize) as core[9d60ee0329d566fc]::cmp::PartialOrd>::lt>
  12:     0x7ff96d2269de - std::panicking::rust_panic_with_hook
                               at /rustc/dcecb99176edf2eec51613730937d21cdd5c8f6e/library\std\src\panicking.rs:841
  13:     0x7ff96d226702 - std::panicking::begin_panic_handler::closure$0
                               at /rustc/dcecb99176edf2eec51613730937d21cdd5c8f6e/library\std\src\panicking.rs:699
  14:     0x7ff96d22104f - std::sys::backtrace::__rust_end_short_backtrace<std::panicking::begin_panic_handler::closure_env$0,never$>
                               at /rustc/dcecb99176edf2eec51613730937d21cdd5c8f6e/library\std\src\sys\backtrace.rs:168
  15:     0x7ff96d22633e - std::panicking::begin_panic_handler
                               at /rustc/dcecb99176edf2eec51613730937d21cdd5c8f6e/library\std\src\panicking.rs:697
  16:     0x7ff9703d3351 - core::panicking::panic_fmt
                               at /rustc/dcecb99176edf2eec51613730937d21cdd5c8f6e/library\core\src\panicking.rs:75
  17:     0x7ff9703d340d - core::panicking::panic
                               at /rustc/dcecb99176edf2eec51613730937d21cdd5c8f6e/library\core\src\panicking.rs:145
  18:     0x7ff9703d32ce - core::option::unwrap_failed
                               at /rustc/dcecb99176edf2eec51613730937d21cdd5c8f6e/library\core\src\option.rs:2040
  19:     0x7ff96d0aa4c6 - <rustc_middle[8660d27183fc6825]::ty::sty::ParamConst>::find_ty_from_env
  20:     0x7ff96e281f71 - <rustc_trait_selection[58084ddd0cf58050]::traits::fulfill::FulfillProcessor as rustc_data_structures[9935af3ebed2be53]::obligation_forest::ObligationProcessor>::process_obligation
  21:     0x7ff96e1c843b - <rustc_data_structures[9935af3ebed2be53]::obligation_forest::ObligationForest<rustc_trait_selection[58084ddd0cf58050]::traits::fulfill::PendingPredicateObligation>>::process_obligations::<rustc_trait_selection[58084ddd0cf58050]::traits::fulfill::FulfillProcessor>
  22:     0x7ff96d4d87bc - <rustc_hir_typeck[bfa3800aa3d4f1a2]::upvar::InferBorrowKind as rustc_hir_typeck[bfa3800aa3d4f1a2]::expr_use_visitor::Delegate>::borrow
  23:     0x7ff96d48e2bf - rustc_hir_typeck[bfa3800aa3d4f1a2]::typeck
  24:     0x7ff96e17427b - rustc_query_impl[993ab63a0c6afe36]::plumbing::query_key_hash_verify_all
  25:     0x7ff96e0acd04 - RINvNtNtCsi9HO7w7UkL_18rustc_query_system5query8plumbing17try_execute_queryINtCsd9DrxHbgjXe_16rustc_query_impl13DynamicConfigINtNtCsd9wXIVlvcyJ_21rustc_data_structures9vec_cache8VecCacheNtNtCs4F9Gp71IGkq_10rustc_span6def_id10LocalDefIdINtNtNtCsbxi6Ha6uNij_
  26:     0x7ff96e17c7b2 - rustc_query_impl[993ab63a0c6afe36]::plumbing::query_key_hash_verify_all
  27:     0x7ff96d8813c3 - rustc_mir_build[d6bf2d72d7ee99f6]::thir::pattern::check_match::check_match
  28:     0x7ff96e171e1b - rustc_query_impl[993ab63a0c6afe36]::plumbing::query_key_hash_verify_all
  29:     0x7ff96e0a7a4e - RINvNtNtCsi9HO7w7UkL_18rustc_query_system5query8plumbing17try_execute_queryINtCsd9DrxHbgjXe_16rustc_query_impl13DynamicConfigINtNtCsd9wXIVlvcyJ_21rustc_data_structures9vec_cache8VecCacheNtNtCs4F9Gp71IGkq_10rustc_span6def_id10LocalDefIdINtNtNtCsbxi6Ha6uNij_
  30:     0x7ff96e17d160 - rustc_query_impl[993ab63a0c6afe36]::plumbing::query_key_hash_verify_all
  31:     0x7ff96d8167b5 - rustc_mir_build[d6bf2d72d7ee99f6]::builder::build_mir
  32:     0x7ff96d6bb3f8 - rustc_mir_transform[581157cbd5ddc9bf]::mir_built
  33:     0x7ff96e17447b - rustc_query_impl[993ab63a0c6afe36]::plumbing::query_key_hash_verify_all
  34:     0x7ff96e0acd04 - RINvNtNtCsi9HO7w7UkL_18rustc_query_system5query8plumbing17try_execute_queryINtCsd9DrxHbgjXe_16rustc_query_impl13DynamicConfigINtNtCsd9wXIVlvcyJ_21rustc_data_structures9vec_cache8VecCacheNtNtCs4F9Gp71IGkq_10rustc_span6def_id10LocalDefIdINtNtNtCsbxi6Ha6uNij_
  35:     0x7ff96e178552 - rustc_query_impl[993ab63a0c6afe36]::plumbing::query_key_hash_verify_all
  36:     0x7ff96d6ba7a8 - rustc_mir_transform[581157cbd5ddc9bf]::mir_const_qualif
  37:     0x7ff96e172ce0 - rustc_query_impl[993ab63a0c6afe36]::plumbing::query_key_hash_verify_all
  38:     0x7ff96e03bb7b - RINvNtNtCsi9HO7w7UkL_18rustc_query_system5query8plumbing17try_execute_queryINtCsd9DrxHbgjXe_16rustc_query_impl13DynamicConfigINtNtB4_6caches10DefIdCacheINtNtNtCsbxi6Ha6uNij_12rustc_middle5query5erase6ErasedAhj4_EEKb0_KB3q_KB3q_ENtNtB1e_8plumbing9QueryCtxtK
  39:     0x7ff96e178471 - rustc_query_impl[993ab63a0c6afe36]::plumbing::query_key_hash_verify_all
  40:     0x7ff96d6bdcf1 - rustc_mir_transform[581157cbd5ddc9bf]::mir_promoted
  41:     0x7ff96e1722f9 - rustc_query_impl[993ab63a0c6afe36]::plumbing::query_key_hash_verify_all
  42:     0x7ff96e0a4041 - RINvNtNtCsi9HO7w7UkL_18rustc_query_system5query8plumbing17try_execute_queryINtCsd9DrxHbgjXe_16rustc_query_impl13DynamicConfigINtNtCsd9wXIVlvcyJ_21rustc_data_structures9vec_cache8VecCacheNtNtCs4F9Gp71IGkq_10rustc_span6def_id10LocalDefIdINtNtNtCsbxi6Ha6uNij_
  43:     0x7ff96e178b02 - rustc_query_impl[993ab63a0c6afe36]::plumbing::query_key_hash_verify_all
  44:     0x7ff96d96d0c8 - rustc_borrowck[d16af58a5736816b]::mir_borrowck
  45:     0x7ff96e17227b - rustc_query_impl[993ab63a0c6afe36]::plumbing::query_key_hash_verify_all
  46:     0x7ff96e0acd04 - RINvNtNtCsi9HO7w7UkL_18rustc_query_system5query8plumbing17try_execute_queryINtCsd9DrxHbgjXe_16rustc_query_impl13DynamicConfigINtNtCsd9wXIVlvcyJ_21rustc_data_structures9vec_cache8VecCacheNtNtCs4F9Gp71IGkq_10rustc_span6def_id10LocalDefIdINtNtNtCsbxi6Ha6uNij_
  47:     0x7ff96e17cd12 - rustc_query_impl[993ab63a0c6afe36]::plumbing::query_key_hash_verify_all
  48:     0x7ff96d6ce6f8 - rustc_mir_transform[581157cbd5ddc9bf]::mir_drops_elaborated_and_const_checked
  49:     0x7ff96e173f1b - rustc_query_impl[993ab63a0c6afe36]::plumbing::query_key_hash_verify_all
  50:     0x7ff96e0acd04 - RINvNtNtCsi9HO7w7UkL_18rustc_query_system5query8plumbing17try_execute_queryINtCsd9DrxHbgjXe_16rustc_query_impl13DynamicConfigINtNtCsd9wXIVlvcyJ_21rustc_data_structures9vec_cache8VecCacheNtNtCs4F9Gp71IGkq_10rustc_span6def_id10LocalDefIdINtNtNtCsbxi6Ha6uNij_
  51:     0x7ff96e178912 - rustc_query_impl[993ab63a0c6afe36]::plumbing::query_key_hash_verify_all
  52:     0x7ff96d6cb2cf - rustc_mir_transform[581157cbd5ddc9bf]::mir_for_ctfe
  53:     0x7ff96e1722b0 - rustc_query_impl[993ab63a0c6afe36]::plumbing::query_key_hash_verify_all
  54:     0x7ff96e03d935 - RINvNtNtCsi9HO7w7UkL_18rustc_query_system5query8plumbing17try_execute_queryINtCsd9DrxHbgjXe_16rustc_query_impl13DynamicConfigINtNtB4_6caches10DefIdCacheINtNtNtCsbxi6Ha6uNij_12rustc_middle5query5erase6ErasedAhj8_EEKb0_KB3q_KB3q_ENtNtB1e_8plumbing9QueryCtxtK
  55:     0x7ff96e178a14 - rustc_query_impl[993ab63a0c6afe36]::plumbing::query_key_hash_verify_all
  56:     0x7ff96dae4f89 - rustc_const_eval[5e4b847289603190]::interpret::eval_context::mir_assign_valid_types
  57:     0x7ff96dca060c - rustc_const_eval[5e4b847289603190]::const_eval::eval_queries::eval_to_allocation_raw_provider
  58:     0x7ff96e1734c8 - rustc_query_impl[993ab63a0c6afe36]::plumbing::query_key_hash_verify_all
  59:     0x7ff96e06a393 - RINvNtNtCsi9HO7w7UkL_18rustc_query_system5query8plumbing17try_execute_queryINtCsd9DrxHbgjXe_16rustc_query_impl13DynamicConfigINtNtB4_6caches12DefaultCacheINtNtCsbxi6Ha6uNij_12rustc_middle2ty20PseudoCanonicalInputNtNtNtB2x_3mir9interpret8GlobalIdEINtNtNtB2x
  60:     0x7ff96e17cf03 - rustc_query_impl[993ab63a0c6afe36]::plumbing::query_key_hash_verify_all
  61:     0x7ff96cb6f0c5 - rustc_const_eval[5e4b847289603190]::const_eval::valtrees::eval_to_valtree
  62:     0x7ff969b79b77 - <alloc[1be1f531b41370bc]::sync::Arc<jiff[27f6babda31ce97f]::tz::db::Kind>>::drop_slow
  63:     0x7ff96cd9abe8 - RINvNtNtCsi9HO7w7UkL_18rustc_query_system5query8plumbing17try_execute_queryINtCsd9DrxHbgjXe_16rustc_query_impl13DynamicConfigINtNtCsd9wXIVlvcyJ_21rustc_data_structures9vec_cache8VecCacheNtNtCs4F9Gp71IGkq_10rustc_span6def_id8CrateNumINtNtNtCsbxi6Ha6uNij_12r
  64:     0x7ff96cd7089b - RINvNtNtCsi9HO7w7UkL_18rustc_query_system5query8plumbing17try_execute_queryINtCsd9DrxHbgjXe_16rustc_query_impl13DynamicConfigINtNtCsd9wXIVlvcyJ_21rustc_data_structures9vec_cache8VecCacheNtNtCs4F9Gp71IGkq_10rustc_span6def_id8CrateNumINtNtNtCsbxi6Ha6uNij_12r
  65:     0x7ff96e06a4ec - RINvNtNtCsi9HO7w7UkL_18rustc_query_system5query8plumbing17try_execute_queryINtCsd9DrxHbgjXe_16rustc_query_impl13DynamicConfigINtNtB4_6caches12DefaultCacheINtNtCsbxi6Ha6uNij_12rustc_middle2ty20PseudoCanonicalInputNtNtNtB2x_3mir9interpret8GlobalIdEINtNtNtB2x
  66:     0x7ff96cdb2653 - rustc_query_impl[993ab63a0c6afe36]::query_system
  67:     0x7ff96d0a65cb - <rustc_middle[8660d27183fc6825]::ty::context::TyCtxt>::const_eval_global_id_for_typeck
  68:     0x7ff96d0a5786 - <rustc_middle[8660d27183fc6825]::ty::context::TyCtxt>::const_eval_resolve_for_typeck
  69:     0x7ff96cebc54f - rustc_trait_selection[58084ddd0cf58050]::traits::try_evaluate_const
  70:     0x7ff96ceb57ec - <rustc_trait_selection[58084ddd0cf58050]::traits::normalize::AssocTypeNormalizer as rustc_type_ir[829588816c884077]::fold::TypeFolder<rustc_middle[8660d27183fc6825]::ty::context::TyCtxt>>::fold_const
  71:     0x7ff96e21bc18 - <rustc_trait_selection[58084ddd0cf58050]::traits::normalize::AssocTypeNormalizer as rustc_type_ir[829588816c884077]::fold::TypeFolder<rustc_middle[8660d27183fc6825]::ty::context::TyCtxt>>::fold_ty
  72:     0x7ff96d54f778 - rustc_hir_analysis[284df9e8bdc6f5c4]::check::region::region_scope_tree
  73:     0x7ff96d5c0fcf - <rustc_hir_analysis[284df9e8bdc6f5c4]::check::wfcheck::check_where_clauses::{closure#2}::CountParams as rustc_type_ir[829588816c884077]::visit::TypeVisitor<rustc_middle[8660d27183fc6825]::ty::context::TyCtxt>>::visit_ty
  74:     0x7ff96d551294 - rustc_hir_analysis[284df9e8bdc6f5c4]::check::region::region_scope_tree
  75:     0x7ff96d554efe - rustc_hir_analysis[284df9e8bdc6f5c4]::check::wfcheck::check_well_formed
  76:     0x7ff96e172d7b - rustc_query_impl[993ab63a0c6afe36]::plumbing::query_key_hash_verify_all
  77:     0x7ff96e0a7cee - RINvNtNtCsi9HO7w7UkL_18rustc_query_system5query8plumbing17try_execute_queryINtCsd9DrxHbgjXe_16rustc_query_impl13DynamicConfigINtNtCsd9wXIVlvcyJ_21rustc_data_structures9vec_cache8VecCacheNtNtCs4F9Gp71IGkq_10rustc_span6def_id10LocalDefIdINtNtNtCsbxi6Ha6uNij_
  78:     0x7ff96e183785 - rustc_query_impl[993ab63a0c6afe36]::plumbing::query_key_hash_verify_all
  79:     0x7ff96d566dea - rustc_hir_analysis[284df9e8bdc6f5c4]::check::wfcheck::check_mod_type_wf
  80:     0x7ff96cd9ba3b - RINvNtNtCsi9HO7w7UkL_18rustc_query_system5query8plumbing17try_execute_queryINtCsd9DrxHbgjXe_16rustc_query_impl13DynamicConfigINtNtCsd9wXIVlvcyJ_21rustc_data_structures9vec_cache8VecCacheNtNtCs4F9Gp71IGkq_10rustc_span6def_id8CrateNumINtNtNtCsbxi6Ha6uNij_12r
  81:     0x7ff96cce5976 - RINvNtNtCsi9HO7w7UkL_18rustc_query_system5query8plumbing17try_execute_queryINtCsd9DrxHbgjXe_16rustc_query_impl13DynamicConfigINtNtB4_6caches12DefaultCacheNtNtCs4F9Gp71IGkq_10rustc_span6def_id13LocalModDefIdINtNtNtCsbxi6Ha6uNij_12rustc_middle5query5erase6Er
  82:     0x7ff96cdb0160 - rustc_query_impl[993ab63a0c6afe36]::query_system
  83:     0x7ff96d5b2d6e - rustc_hir_analysis[284df9e8bdc6f5c4]::check_crate
  84:     0x7ff96d28a1f6 - <rustc_interface[642e9f6cacad30a4]::passes::LintStoreExpandImpl as rustc_expand[6c773f9594c871da]::base::LintStoreExpand>::pre_expansion_lint
  85:     0x7ff969b8dbf7 - rustc_interface[642e9f6cacad30a4]::passes::analysis
  86:     0x7ff96cd9e7ca - RINvNtNtCsi9HO7w7UkL_18rustc_query_system5query8plumbing17try_execute_queryINtCsd9DrxHbgjXe_16rustc_query_impl13DynamicConfigINtNtCsd9wXIVlvcyJ_21rustc_data_structures9vec_cache8VecCacheNtNtCs4F9Gp71IGkq_10rustc_span6def_id8CrateNumINtNtNtCsbxi6Ha6uNij_12r
  87:     0x7ff96cca730a - RINvNtNtCsi9HO7w7UkL_18rustc_query_system5query8plumbing17try_execute_queryINtCsd9DrxHbgjXe_16rustc_query_impl13DynamicConfigINtNtB4_6caches11SingleCacheINtNtNtCsbxi6Ha6uNij_12rustc_middle5query5erase6ErasedAhj0_EEKb0_KB3r_KB3r_ENtNtB1e_8plumbing9QueryCtxt
  88:     0x7ff96cda4df3 - rustc_query_impl[993ab63a0c6afe36]::query_system
  89:     0x7ff969b4ecf8 - std[547ad0aa56f99cda]::sys::backtrace::__rust_begin_short_backtrace::<<std[547ad0aa56f99cda]::thread::Builder>::spawn_unchecked_<ctrlc[8beb5292918c80fb]::set_handler_inner<rustc_driver_impl[ee03924009af6117]::install_ctrlc_handler::{closure#0}>::{closure#0}, ()>::{closure#1}::{closure#0}::{closure#0}, ()>
  90:     0x7ff969b48f36 - std[547ad0aa56f99cda]::sys::backtrace::__rust_begin_short_backtrace::<<std[547ad0aa56f99cda]::thread::Builder>::spawn_unchecked_<ctrlc[8beb5292918c80fb]::set_handler_inner<rustc_driver_impl[ee03924009af6117]::install_ctrlc_handler::{closure#0}>::{closure#0}, ()>::{closure#1}::{closure#0}::{closure#0}, ()>
  91:     0x7ff969b4413f - RINvNtNtCs7fGoaO6NkXC_3std3sys9backtrace28___rust_begin_short_backtraceNCNCINvNtCs8BgyDmMp6lY_15rustc_interface4util26run_in_thread_with_globalsNCINvB1e_31run_in_thread_pool_with_globalsNCINvNtB1g_9interface12run_compileruNCNvCskqWrDiLSCdn_17rustc_driver_i
  92:     0x7ff969b53050 - std[547ad0aa56f99cda]::sys::backtrace::__rust_begin_short_backtrace::<<std[547ad0aa56f99cda]::thread::Builder>::spawn_unchecked_<ctrlc[8beb5292918c80fb]::set_handler_inner<rustc_driver_impl[ee03924009af6117]::install_ctrlc_handler::{closure#0}>::{closure#0}, ()>::{closure#1}::{closure#0}::{closure#0}, ()>
  93:     0x7ff96d22ad6d - alloc::boxed::impl$28::call_once
                               at /rustc/dcecb99176edf2eec51613730937d21cdd5c8f6e/library\alloc\src\boxed.rs:1966
  94:     0x7ff96d22ad6d - alloc::boxed::impl$28::call_once
                               at /rustc/dcecb99176edf2eec51613730937d21cdd5c8f6e/library\alloc\src\boxed.rs:1966
  95:     0x7ff96d22ad6d - std::sys::pal::windows::thread::impl$0::new::thread_start
                               at /rustc/dcecb99176edf2eec51613730937d21cdd5c8f6e/library\std\src\sys\pal\windows\thread.rs:56
  96:     0x7ffa0f247374 - BaseThreadInitThunk
  97:     0x7ffa1063cc91 - RtlUserThreadStart

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: please attach the file at `D:\rust_test\test1\src\rustc-ice-2025-05-10T11_55_56-33528.txt` to your bug report

query stack during panic:
#0 [typeck] type-checking `<impl at .\test.rs:2:1: 2:39>::next::{constant#0}`
#1 [check_match] match-checking `<impl at .\test.rs:2:1: 2:39>::next::{constant#0}`
... and 11 other queries... use `env RUST_BACKTRACE=1` to see the full query stack
error: aborting due to 3 previous errors

[moxian]

This does indeed bisect the same as #129209

specifically pointing to nightly-2024-06-07 and #‍125958

  - #126038 (Rollup of 9 pull requests) by matthiaskrgr
    - #124840 (resolve: mark it undetermined if single import is not has any bindings)
    - #125622 (Winnow private method candidates instead of assuming any candidate of the right name will apply)
    - #125648 (Remove unused(?) `~/rustsrc` folder from docker script)
    - #125672 (Add more ABI test cases to miri (RFC 3391))
    - #125800 (Fix `mut` static task queue in SGX target)
    - #125871 (Orphanck[old solver]: Consider opaque types to never cover type parameters)
    - #125893 (Handle all GVN binops in a single place.)
    - #126008 (Port `tests/run-make-fulldeps/issue-19371` to ui-fulldeps)
    - #126032 (Update description of the `IsTerminal` example)
  - #122505 (Don't walk the bodies of free constants for reachability.) by oli-obk
  - #125958 (Remove the `ty` field from type system `Const`s) by BoxyUwU
  - #126056 (Rollup of 6 pull requests) by matthiaskrgr
    - #124731 (Add translation support by mdbook-i18n-helpers to bootstrap)
    - #125168 (Match ergonomics 2024: align implementation with RFC)
    - #125925 (Don't trigger `unsafe_op_in_unsafe_fn` for deprecated safe fns)
    - #125987 (When `derive`ing, account for HRTB on `BareFn` fields)
    - #126045 (check_expr_struct_fields: taint context with errors if struct definit…)
    - #126048 (Fix typos in cargo-specifics.md)
  - #124482 (Unsafe extern blocks) by spastorino
  - #125406 (Directly add extension instead of using `Path::with_extension`) by tbu-
  - #125411 (check host's libstdc++ version when using ci llvm) by onur-ozkan
  - #126061 (Update to LLVM 18.1.7) by nikic
  - #126068 (Revert "use `tcx.used_crates(())` more" before it reaches beta) by lqd