ICE when passing the result of .peekable() to recursive call

[adambiltcliffe]

Code

struct Data {
    data: String,
}

fn bad(input: &mut impl Iterator<Item = Data>) {
    let mut p = input.peekable();
    loop {
        bad(&mut p);
    }
}

fn main() {
    bad(&mut std::iter::empty());
}

Meta

rustc --version --verbose:

rustc 1.81.0-nightly (bcf94dec5 2024-06-23)
binary: rustc
commit-hash: bcf94dec5ba6838e435902120c0384c360126a26
commit-date: 2024-06-23
host: x86_64-pc-windows-msvc
release: 1.81.0-nightly
LLVM version: 18.1.7

Error output

thread 'rustc' panicked at /rustc/bcf94dec5ba6838e435902120c0384c360126a26\compiler\rustc_type_ir\src\ty_kind.rs:889:17:
type variables should not be hashed: ?0t

Backtrace

stack backtrace:
   0:     0x7ffd0243d5b3 - std::backtrace_rs::backtrace::dbghelp64::trace
                               at /rustc/bcf94dec5ba6838e435902120c0384c360126a26/library\std\src\..\..\backtrace\src\backtrace\dbghelp64.rs:91
   1:     0x7ffd0243d5b3 - std::backtrace_rs::backtrace::trace_unsynchronized
                               at /rustc/bcf94dec5ba6838e435902120c0384c360126a26/library\std\src\..\..\backtrace\src\backtrace\mod.rs:66
   2:     0x7ffd0243d5b3 - std::backtrace::Backtrace::create
                               at /rustc/bcf94dec5ba6838e435902120c0384c360126a26/library\std\src\backtrace.rs:331
   3:     0x7ffd0243d4fa - std::backtrace::Backtrace::force_capture
                               at /rustc/bcf94dec5ba6838e435902120c0384c360126a26/library\std\src\backtrace.rs:312
   4:     0x7ffcb8279b41 - memchr
   5:     0x7ffd02457247 - alloc::boxed::impl$50::call
                               at /rustc/bcf94dec5ba6838e435902120c0384c360126a26/library\alloc\src\boxed.rs:2078
   6:     0x7ffd02457247 - std::panicking::rust_panic_with_hook
                               at /rustc/bcf94dec5ba6838e435902120c0384c360126a26/library\std\src\panicking.rs:804
   7:     0x7ffd02457056 - std::panicking::begin_panic_handler::closure$0
                               at /rustc/bcf94dec5ba6838e435902120c0384c360126a26/library\std\src\panicking.rs:670
   8:     0x7ffd024544ff - std::sys::backtrace::__rust_end_short_backtrace<std::panicking::begin_panic_handler::closure_env$0,never$>
                               at /rustc/bcf94dec5ba6838e435902120c0384c360126a26/library\std\src\sys\backtrace.rs:171
   9:     0x7ffd02456cb6 - std::panicking::begin_panic_handler
                               at /rustc/bcf94dec5ba6838e435902120c0384c360126a26/library\std\src\panicking.rs:661
  10:     0x7ffd024aca34 - core::panicking::panic_fmt
                               at /rustc/bcf94dec5ba6838e435902120c0384c360126a26/library\core\src\panicking.rs:74
  11:     0x7ffcb80279c1 - <&rustc_middle[efe08594ec63cbac]::ty::list::RawList<_, _> as rustc_data_structures[6b6cfc4876cd2fb9]::stable_hasher::HashStable<rustc_query_system[906ba7f1f5f1384c]::ich::hcx::StableHashingContext>>::hash_stable::CACHE::{closure#0}::VAL::{shim:tls#0}
  12:     0x7ffcb8024920 - <&rustc_middle[efe08594ec63cbac]::ty::list::RawList<_, _> as rustc_data_structures[6b6cfc4876cd2fb9]::stable_hasher::HashStable<rustc_query_system[906ba7f1f5f1384c]::ich::hcx::StableHashingContext>>::hash_stable::CACHE::{closure#0}::VAL::{shim:tls#0}
  13:     0x7ffcb7800bdd - rustc_ty_utils[497df0ed0719fc06]::ty::self_ty_of_trait_impl_enabling_order_dep_trait_object_hack
  14:     0x7ffcb771bc4e - rustc_ty_utils[497df0ed0719fc06]::ty::self_ty_of_trait_impl_enabling_order_dep_trait_object_hack
  15:     0x7ffcb782930f - rustc_query_impl[fb887b361612166]::plumbing::query_key_hash_verify_all
  16:     0x7ffcb80890d6 - <rustc_middle[efe08594ec63cbac]::ty::normalize_erasing_regions::TryNormalizeAfterErasingRegionsFolder as rustc_type_ir[fc5eda9d39b90f5c]::fold::FallibleTypeFolder<rustc_middle[efe08594ec63cbac]::ty::context::TyCtxt>>::try_fold_ty
  17:     0x7ffcb76ac793 - rustc_ty_utils[497df0ed0719fc06]::needs_drop::needs_drop_raw
  18:     0x7ffcb7816f4b - rustc_query_impl[fb887b361612166]::plumbing::query_key_hash_verify_all
  19:     0x7ffcb7717589 - rustc_ty_utils[497df0ed0719fc06]::ty::self_ty_of_trait_impl_enabling_order_dep_trait_object_hack
  20:     0x7ffcb782627c - rustc_query_impl[fb887b361612166]::plumbing::query_key_hash_verify_all
  21:     0x7ffcb7697c83 - rustc_ty_utils[497df0ed0719fc06]::instance::resolve_instance
  22:     0x7ffcb78175cd - rustc_query_impl[fb887b361612166]::plumbing::query_key_hash_verify_all
  23:     0x7ffcb7726f43 - rustc_ty_utils[497df0ed0719fc06]::ty::self_ty_of_trait_impl_enabling_order_dep_trait_object_hack
  24:     0x7ffcb782a6ae - rustc_query_impl[fb887b361612166]::plumbing::query_key_hash_verify_all
  25:     0x7ffcb80ea152 - <rustc_middle[efe08594ec63cbac]::ty::instance::Instance>::resolve_drop_in_place
  26:     0x7ffcb7ce0dee - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  27:     0x7ffcb7cd9fd3 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  28:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  29:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  30:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  31:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  32:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  33:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  34:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  35:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  36:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  37:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  38:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  39:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  40:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  41:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  42:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  43:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  44:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  45:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  46:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  47:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  48:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  49:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  50:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  51:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  52:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  53:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  54:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  55:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  56:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  57:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  58:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  59:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  60:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  61:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  62:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  63:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  64:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  65:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  66:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  67:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  68:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  69:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  70:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  71:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  72:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  73:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  74:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  75:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  76:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  77:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  78:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  79:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  80:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  81:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  82:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  83:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  84:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  85:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  86:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  87:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  88:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  89:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  90:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  91:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  92:     0x7ffcb7cdb878 - rustc_monomorphize[9e988b656563743c]::is_call_from_compiler_builtins_to_upstream_monomorphization
  93:     0x7ffcb7ccf224 - rustc_monomorphize[9e988b656563743c]::partitioning::collect_and_partition_mono_items
  94:     0x7ffcb6991e37 - <dyn std[ebf6c742c81fa920]::io::Write as nu_ansi_term[61a103b39c14fcfa]::write::AnyWrite>::write_str
  95:     0x7ffcb69772ed - <dyn std[ebf6c742c81fa920]::io::Write as nu_ansi_term[61a103b39c14fcfa]::write::AnyWrite>::write_str
  96:     0x7ffcb68a7f22 - rustc_ty_utils[497df0ed0719fc06]::ty::adt_sized_constraint
  97:     0x7ffcb69b527e - rustc_query_impl[fb887b361612166]::query_system
  98:     0x7ffcb408a344 - <rustc_codegen_llvm[b497366773d63e34]::LlvmCodegenBackend as rustc_codegen_ssa[d1e47d58f7899397]::traits::backend::CodegenBackend>::codegen_crate
  99:     0x7ffcb3fdaa33 - rustc_interface[d65d71c3705523e8]::passes::start_codegen
 100:     0x7ffcb3fe3d97 - <rustc_interface[d65d71c3705523e8]::queries::Queries>::codegen_and_build_linker
 101:     0x7ffcb3f96272 - _wpgmptr
 102:     0x7ffcb3f922ef - _wpgmptr
 103:     0x7ffcb3f9b2e9 - _wpgmptr
 104:     0x7ffd024680ed - alloc::boxed::impl$48::call_once
                               at /rustc/bcf94dec5ba6838e435902120c0384c360126a26/library\alloc\src\boxed.rs:2064
 105:     0x7ffd024680ed - alloc::boxed::impl$48::call_once
                               at /rustc/bcf94dec5ba6838e435902120c0384c360126a26/library\alloc\src\boxed.rs:2064
 106:     0x7ffd024680ed - std::sys::pal::windows::thread::impl$0::new::thread_start
                               at /rustc/bcf94dec5ba6838e435902120c0384c360126a26/library\std\src\sys\pal\windows\thread.rs:52
 107:     0x7ffd51ae7344 - BaseThreadInitThunk
 108:     0x7ffd51c226b1 - RtlUserThreadStart


rustc version: 1.81.0-nightly (bcf94dec5 2024-06-23)
platform: x86_64-pc-windows-msvc

query stack during panic:
#0 [try_normalize_generic_arg_after_erasing_regions] normalizing `core::option::Option<<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::sources::empty::Empty<Data>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> as core::iter::traits::iterator::Iterator>::Item>`
#1 [needs_drop_raw] computing whether `core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::sources::empty::Empty<Data>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>` needs drop
#2 [resolve_instance] resolving instance `core::ptr::drop_in_place::<core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::adapters::peekable::Peekable<&mut core::iter::sources::empty::Empty<Data>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>`
#3 [collect_and_partition_mono_items] collect_and_partition_mono_items
end of query stack

[workingjubilee]

impressive.

[saethlin]

This regressed in 1.45, from

error[E0275]: overflow evaluating the requirement `&mut std::iter::Empty<Data>: std::iter::Iterator`

And this program has never produced a good error. I've checked back to 1.26 when impl trait in argument position was stabilized.

[theemathas]

I tried to minimize the code to not depend on iterators, and now I've got a different ICE, which seems similar to #122823. (index out of bounds: the len is 0 but the index is 0)

#![allow(unconditional_recursion)]

fn conjure<T>() -> T {
    unimplemented!()
}

struct Thing;
struct Wrap<T>(T);

trait HasItem {
    type Item;
}
impl HasItem for Thing {
    type Item = ();
}
impl<T: HasItem> HasItem for Wrap<T> {
    type Item = T::Item;
}

struct ItemOf<T: HasItem>(T::Item);

fn bad<T: HasItem>() {
    conjure::<ItemOf<Wrap<T>>>();
    bad::<Wrap<T>>();
}

fn main() {
    bad::<Thing>();
}

Error output

   Compiling playground v0.0.1 (/playground)
thread 'rustc' panicked at /rust/deps/ena-0.14.2/src/snapshot_vec.rs:199:10:
index out of bounds: the len is 0 but the index is 0
stack backtrace:
   0:     0x7f6c507f5035 - std::backtrace_rs::backtrace::libunwind::trace::h1a07e5dba0da0cd2
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/std/src/../../backtrace/src/backtrace/libunwind.rs:105:5
   1:     0x7f6c507f5035 - std::backtrace_rs::backtrace::trace_unsynchronized::h61b9b8394328c0bc
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f6c507f5035 - std::sys_common::backtrace::_print_fmt::h1c5e18b460934cff
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/std/src/sys_common/backtrace.rs:68:5
   3:     0x7f6c507f5035 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h1e1a1972118942ad
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f6c5084429b - core::fmt::rt::Argument::fmt::h07af2b4071d536cd
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/core/src/fmt/rt.rs:165:63
   5:     0x7f6c5084429b - core::fmt::write::hc090a2ffd6b28c4a
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/core/src/fmt/mod.rs:1157:21
   6:     0x7f6c507e9bdf - std::io::Write::write_fmt::h8898bac6ff039a23
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/std/src/io/mod.rs:1832:15
   7:     0x7f6c507f4e0e - std::sys_common::backtrace::_print::h4e80c5803d4ee35b
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7f6c507f4e0e - std::sys_common::backtrace::print::ha96650907276675e
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7f6c507f7779 - std::panicking::default_hook::{{closure}}::h215c2a0a8346e0e0
  10:     0x7f6c507f74bd - std::panicking::default_hook::h207342be97478370
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/std/src/panicking.rs:298:9
  11:     0x7f6c536f21b7 - std[3c8ba8ebcf555201]::panicking::update_hook::<alloc[bfbae7e348dce413]::boxed::Box<rustc_driver_impl[c88438ade88661f4]::install_ice_hook::{closure#0}>>::{closure#0}
  12:     0x7f6c507f7e76 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::ha9c3bc81d312fd83
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/alloc/src/boxed.rs:2036:9
  13:     0x7f6c507f7e76 - std::panicking::rust_panic_with_hook::hac8bdceee1e4fe2c
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/std/src/panicking.rs:799:13
  14:     0x7f6c507f7c24 - std::panicking::begin_panic_handler::{{closure}}::h00d785e82757ce3c
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/std/src/panicking.rs:664:13
  15:     0x7f6c507f54f9 - std::sys_common::backtrace::__rust_end_short_backtrace::h1628d957bcd06996
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/std/src/sys_common/backtrace.rs:171:18
  16:     0x7f6c507f7957 - rust_begin_unwind
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/std/src/panicking.rs:652:5
  17:     0x7f6c50840763 - core::panicking::panic_fmt::hdc63834ffaaefae5
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/core/src/panicking.rs:72:14
  18:     0x7f6c50840987 - core::panicking::panic_bounds_check::hd7e618b1b39cc1c3
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/core/src/panicking.rs:275:5
  19:     0x7f6c55b7f768 - <ena[7ba0c23a1613b29]::unify::UnificationTable<ena[7ba0c23a1613b29]::unify::backing_vec::InPlace<rustc_infer[abd41066181445be]::infer::type_variable::TyVidEqKey, &mut alloc[bfbae7e348dce413]::vec::Vec<ena[7ba0c23a1613b29]::unify::VarValue<rustc_infer[abd41066181445be]::infer::type_variable::TyVidEqKey>>, &mut rustc_infer[abd41066181445be]::infer::snapshot::undo_log::InferCtxtUndoLogs>>>::uninlined_get_root_key.llvm.6537034541696690420.cold
  20:     0x7f6c518c0045 - <rustc_infer[abd41066181445be]::infer::canonical::canonicalizer::Canonicalizer as rustc_type_ir[a145be3c51398263]::fold::TypeFolder<rustc_middle[3ff731b746e7b038]::ty::context::TyCtxt>>::fold_ty
  21:     0x7f6c54ef6b38 - <rustc_infer[abd41066181445be]::infer::canonical::canonicalizer::Canonicalizer as rustc_type_ir[a145be3c51398263]::fold::FallibleTypeFolder<rustc_middle[3ff731b746e7b038]::ty::context::TyCtxt>>::try_fold_predicate
  22:     0x7f6c5227701f - rustc_trait_selection[173dcaf5d960508e]::traits::type_known_to_meet_bound_modulo_regions
  23:     0x7f6c54cc840b - rustc_query_impl[a12402620de91e8]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[a12402620de91e8]::query_impl::is_copy_raw::dynamic_query::{closure#2}::{closure#0}, rustc_middle[3ff731b746e7b038]::query::erase::Erased<[u8; 1usize]>>
  24:     0x7f6c54cc93c6 - rustc_query_system[4e189ce2c77124d]::query::plumbing::try_execute_query::<rustc_query_impl[a12402620de91e8]::DynamicConfig<rustc_query_system[4e189ce2c77124d]::query::caches::DefaultCache<rustc_middle[3ff731b746e7b038]::ty::ParamEnvAnd<rustc_middle[3ff731b746e7b038]::ty::Ty>, rustc_middle[3ff731b746e7b038]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[a12402620de91e8]::plumbing::QueryCtxt, false>
  25:     0x7f6c54cc90ce - rustc_query_impl[a12402620de91e8]::query_impl::is_copy_raw::get_query_non_incr::__rust_end_short_backtrace
  26:     0x7f6c54cca0eb - rustc_ty_utils[b79b74a9f824867d]::needs_drop::needs_drop_raw
  27:     0x7f6c54cc9b59 - rustc_query_impl[a12402620de91e8]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[a12402620de91e8]::query_impl::needs_drop_raw::dynamic_query::{closure#2}::{closure#0}, rustc_middle[3ff731b746e7b038]::query::erase::Erased<[u8; 1usize]>>
  28:     0x7f6c54cc936a - rustc_query_system[4e189ce2c77124d]::query::plumbing::try_execute_query::<rustc_query_impl[a12402620de91e8]::DynamicConfig<rustc_query_system[4e189ce2c77124d]::query::caches::DefaultCache<rustc_middle[3ff731b746e7b038]::ty::ParamEnvAnd<rustc_middle[3ff731b746e7b038]::ty::Ty>, rustc_middle[3ff731b746e7b038]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[a12402620de91e8]::plumbing::QueryCtxt, false>
  29:     0x7f6c54cc900e - rustc_query_impl[a12402620de91e8]::query_impl::needs_drop_raw::get_query_non_incr::__rust_end_short_backtrace
  30:     0x7f6c5206c26f - rustc_ty_utils[b79b74a9f824867d]::instance::resolve_instance
  31:     0x7f6c54d0fa69 - rustc_query_impl[a12402620de91e8]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[a12402620de91e8]::query_impl::resolve_instance::dynamic_query::{closure#2}::{closure#0}, rustc_middle[3ff731b746e7b038]::query::erase::Erased<[u8; 32usize]>>
  32:     0x7f6c54d0fd5b - rustc_query_system[4e189ce2c77124d]::query::plumbing::try_execute_query::<rustc_query_impl[a12402620de91e8]::DynamicConfig<rustc_query_system[4e189ce2c77124d]::query::caches::DefaultCache<rustc_middle[3ff731b746e7b038]::ty::ParamEnvAnd<(rustc_span[8c7415e9d33ddd75]::def_id::DefId, &rustc_middle[3ff731b746e7b038]::ty::list::RawList<(), rustc_middle[3ff731b746e7b038]::ty::generic_args::GenericArg>)>, rustc_middle[3ff731b746e7b038]::query::erase::Erased<[u8; 32usize]>>, false, false, false>, rustc_query_impl[a12402620de91e8]::plumbing::QueryCtxt, false>
  33:     0x7f6c54d0f9ef - rustc_query_impl[a12402620de91e8]::query_impl::resolve_instance::get_query_non_incr::__rust_end_short_backtrace
  34:     0x7f6c54d117a2 - <rustc_middle[3ff731b746e7b038]::ty::instance::Instance>::resolve_drop_in_place
  35:     0x7f6c52c60d93 - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec::{closure#0}
  36:     0x7f6c5573d99b - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  37:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  38:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  39:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  40:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  41:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  42:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  43:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  44:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  45:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  46:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  47:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  48:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  49:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  50:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  51:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  52:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  53:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  54:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  55:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  56:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  57:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  58:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  59:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  60:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  61:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  62:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  63:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  64:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  65:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  66:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  67:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  68:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  69:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  70:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  71:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  72:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  73:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  74:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  75:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  76:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  77:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  78:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  79:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  80:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  81:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  82:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  83:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  84:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  85:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  86:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  87:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  88:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  89:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  90:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  91:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  92:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  93:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  94:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  95:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  96:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  97:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  98:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
  99:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 100:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 101:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 102:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 103:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 104:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 105:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 106:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 107:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 108:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 109:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 110:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 111:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 112:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 113:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 114:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 115:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 116:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 117:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 118:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 119:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 120:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 121:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 122:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 123:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 124:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 125:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 126:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 127:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 128:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 129:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 130:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 131:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 132:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 133:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 134:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 135:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 136:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 137:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 138:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 139:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 140:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 141:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 142:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 143:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 144:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 145:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 146:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 147:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 148:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 149:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 150:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 151:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 152:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 153:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 154:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 155:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 156:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 157:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 158:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 159:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 160:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 161:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 162:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 163:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 164:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 165:     0x7f6c5573e3cf - rustc_monomorphize[a1d059b428f59f61]::collector::collect_items_rec
 166:     0x7f6c55735981 - rustc_monomorphize[a1d059b428f59f61]::partitioning::collect_and_partition_mono_items
 167:     0x7f6c55734d56 - rustc_query_impl[a12402620de91e8]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[a12402620de91e8]::query_impl::collect_and_partition_mono_items::dynamic_query::{closure#2}::{closure#0}, rustc_middle[3ff731b746e7b038]::query::erase::Erased<[u8; 24usize]>>
 168:     0x7f6c55734d1f - <rustc_query_impl[a12402620de91e8]::query_impl::collect_and_partition_mono_items::dynamic_query::{closure#2} as core[868bc93c3f2beb33]::ops::function::FnOnce<(rustc_middle[3ff731b746e7b038]::ty::context::TyCtxt, ())>>::call_once
 169:     0x7f6c55749dfd - rustc_query_system[4e189ce2c77124d]::query::plumbing::try_execute_query::<rustc_query_impl[a12402620de91e8]::DynamicConfig<rustc_query_system[4e189ce2c77124d]::query::caches::SingleCache<rustc_middle[3ff731b746e7b038]::query::erase::Erased<[u8; 24usize]>>, false, false, false>, rustc_query_impl[a12402620de91e8]::plumbing::QueryCtxt, false>
 170:     0x7f6c55749b45 - rustc_query_impl[a12402620de91e8]::query_impl::collect_and_partition_mono_items::get_query_non_incr::__rust_end_short_backtrace
 171:     0x7f6c558cac4b - <rustc_codegen_llvm[6172e0583731cd24]::LlvmCodegenBackend as rustc_codegen_ssa[8b1fc88ede96b23c]::traits::backend::CodegenBackend>::codegen_crate
 172:     0x7f6c5589a345 - rustc_interface[640972162e3c086f]::passes::start_codegen
 173:     0x7f6c55899ad8 - <rustc_interface[640972162e3c086f]::queries::Queries>::codegen_and_build_linker
 174:     0x7f6c555ec1be - rustc_interface[640972162e3c086f]::interface::run_compiler::<core[868bc93c3f2beb33]::result::Result<(), rustc_span[8c7415e9d33ddd75]::ErrorGuaranteed>, rustc_driver_impl[c88438ade88661f4]::run_compiler::{closure#0}>::{closure#1}
 175:     0x7f6c555a9f8b - std[3c8ba8ebcf555201]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[640972162e3c086f]::util::run_in_thread_with_globals<rustc_interface[640972162e3c086f]::interface::run_compiler<core[868bc93c3f2beb33]::result::Result<(), rustc_span[8c7415e9d33ddd75]::ErrorGuaranteed>, rustc_driver_impl[c88438ade88661f4]::run_compiler::{closure#0}>::{closure#1}, core[868bc93c3f2beb33]::result::Result<(), rustc_span[8c7415e9d33ddd75]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[868bc93c3f2beb33]::result::Result<(), rustc_span[8c7415e9d33ddd75]::ErrorGuaranteed>>
 176:     0x7f6c555a9d80 - <<std[3c8ba8ebcf555201]::thread::Builder>::spawn_unchecked_<rustc_interface[640972162e3c086f]::util::run_in_thread_with_globals<rustc_interface[640972162e3c086f]::interface::run_compiler<core[868bc93c3f2beb33]::result::Result<(), rustc_span[8c7415e9d33ddd75]::ErrorGuaranteed>, rustc_driver_impl[c88438ade88661f4]::run_compiler::{closure#0}>::{closure#1}, core[868bc93c3f2beb33]::result::Result<(), rustc_span[8c7415e9d33ddd75]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[868bc93c3f2beb33]::result::Result<(), rustc_span[8c7415e9d33ddd75]::ErrorGuaranteed>>::{closure#2} as core[868bc93c3f2beb33]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
 177:     0x7f6c50801cab - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h09e5a4c541afa800
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/alloc/src/boxed.rs:2022:9
 178:     0x7f6c50801cab - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h9c8b03c22f4e7026
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/alloc/src/boxed.rs:2022:9
 179:     0x7f6c50801cab - std::sys::pal::unix::thread::Thread::new::thread_start::h522bc89a54da820a
                               at /rustc/129f3b9964af4d4a709d1383930ade12dfe7c081/library/std/src/sys/pal/unix/thread.rs:108:17
 180:     0x7f6c5070f609 - start_thread
 181:     0x7f6c50632353 - clone
 182:                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: rustc 1.79.0 (129f3b996 2024-06-10) running on x86_64-unknown-linux-gnu

note: compiler flags: --crate-type bin -C embed-bitcode=no -C codegen-units=1 -C debuginfo=2

note: some of the compiler flags provided by cargo are hidden

query stack during panic:
#0 [is_copy_raw] computing whether `_` is `Copy`
#1 [needs_drop_raw] computing whether `ItemOf<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Thing>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>` needs drop
#2 [resolve_instance] resolving instance `core::ptr::drop_in_place::<ItemOf<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Wrap<Thing>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>`
#3 [collect_and_partition_mono_items] collect_and_partition_mono_items
end of query stack
error: could not compile `playground` (bin "playground")

[matthiaskrgr]

duplicate of #118590 (comment)