ICE: rustdoc: panicked at 'index out of bounds: the len is 0 but the index is 0 search_index.rs #106213

thread 'rustc' panicked at 'index out of bounds: the len is 0 but the index is 0', src/librustdoc/html/render/search_index.rs:325:25
stack backtrace:
   0:     0x7f8aae0793da - std::backtrace_rs::backtrace::libunwind::trace::hd9920c45cab02727
                               at /rustc/92c1937a90e5b6f20fa6e87016d6869da363972e/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7f8aae0793da - std::backtrace_rs::backtrace::trace_unsynchronized::h0e8ba232432f278b
                               at /rustc/92c1937a90e5b6f20fa6e87016d6869da363972e/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f8aae0793da - std::sys_common::backtrace::_print_fmt::h70b1bf152d50d826
                               at /rustc/92c1937a90e5b6f20fa6e87016d6869da363972e/library/std/src/sys_common/backtrace.rs:65:5
   3:     0x7f8aae0793da - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h0f8a00c5ac0ea98c
                               at /rustc/92c1937a90e5b6f20fa6e87016d6869da363972e/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f8aae0dc62e - core::fmt::write::h75194d37b0340e77
                               at /rustc/92c1937a90e5b6f20fa6e87016d6869da363972e/library/core/src/fmt/mod.rs:1208:17
   5:     0x7f8aae069885 - std::io::Write::write_fmt::h019baaeffa3c233d
                               at /rustc/92c1937a90e5b6f20fa6e87016d6869da363972e/library/std/src/io/mod.rs:1682:15
   6:     0x7f8aae0791a5 - std::sys_common::backtrace::_print::hd2cb40128730a76d
                               at /rustc/92c1937a90e5b6f20fa6e87016d6869da363972e/library/std/src/sys_common/backtrace.rs:47:5
   7:     0x7f8aae0791a5 - std::sys_common::backtrace::print::h30c90b179f5588ff
                               at /rustc/92c1937a90e5b6f20fa6e87016d6869da363972e/library/std/src/sys_common/backtrace.rs:34:9
   8:     0x7f8aae07bf6f - std::panicking::default_hook::{{closure}}::hb4605418c1ac9dde
                               at /rustc/92c1937a90e5b6f20fa6e87016d6869da363972e/library/std/src/panicking.rs:267:22
   9:     0x7f8aae07bcab - std::panicking::default_hook::h911627d2c5874d29
                               at /rustc/92c1937a90e5b6f20fa6e87016d6869da363972e/library/std/src/panicking.rs:286:9
  10:     0x7f8aace6ce4f - rustc_driver[be31376d096510e8]::DEFAULT_HOOK::{closure#0}::{closure#0}
  11:     0x7f8aae07c7ad - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h30886b880f16ecd7
                               at /rustc/92c1937a90e5b6f20fa6e87016d6869da363972e/library/alloc/src/boxed.rs:2032:9
  12:     0x7f8aae07c7ad - std::panicking::rust_panic_with_hook::h7c2b44024a401155
                               at /rustc/92c1937a90e5b6f20fa6e87016d6869da363972e/library/std/src/panicking.rs:692:13
  13:     0x7f8aae07c529 - std::panicking::begin_panic_handler::{{closure}}::h8e64ae5b7bafe3c0
                               at /rustc/92c1937a90e5b6f20fa6e87016d6869da363972e/library/std/src/panicking.rs:579:13
  14:     0x7f8aae07988c - std::sys_common::backtrace::__rust_end_short_backtrace::hd43ee2e6b4a0d8d6
                               at /rustc/92c1937a90e5b6f20fa6e87016d6869da363972e/library/std/src/sys_common/backtrace.rs:137:18
  15:     0x7f8aae07c232 - rust_begin_unwind
                               at /rustc/92c1937a90e5b6f20fa6e87016d6869da363972e/library/std/src/panicking.rs:575:5
  16:     0x7f8aae0d9013 - core::panicking::panic_fmt::hfd723e1f10b23e9d
                               at /rustc/92c1937a90e5b6f20fa6e87016d6869da363972e/library/core/src/panicking.rs:64:14
  17:     0x7f8aae0d91e2 - core::panicking::panic_bounds_check::h8a845910d11289b5
                               at /rustc/92c1937a90e5b6f20fa6e87016d6869da363972e/library/core/src/panicking.rs:148:5
  18:     0x55609f53ba87 - rustdoc[8f23bbef6cf7efb7]::html::render::search_index::get_index_type
  19:     0x55609f554cfb - rustdoc[8f23bbef6cf7efb7]::html::render::search_index::add_generics_and_bounds_as_types::insert_ty
  20:     0x55609f55432a - rustdoc[8f23bbef6cf7efb7]::html::render::search_index::add_generics_and_bounds_as_types
  21:     0x55609f53c22f - rustdoc[8f23bbef6cf7efb7]::html::render::search_index::get_fn_inputs_and_outputs
  22:     0x55609f53b82d - rustdoc[8f23bbef6cf7efb7]::html::render::search_index::get_function_type_for_search
  23:     0x55609f7c868e - <rustdoc[8f23bbef6cf7efb7]::formats::cache::CacheBuilder as rustdoc[8f23bbef6cf7efb7]::fold::DocFolder>::fold_item
  24:     0x55609f591c58 - <alloc[c40375f0f7ff5c91]::vec::Vec<rustdoc[8f23bbef6cf7efb7]::clean::types::Item> as alloc[c40375f0f7ff5c91]::vec::spec_from_iter::SpecFromIter<rustdoc[8f23bbef6cf7efb7]::clean::types::Item, core[468623a6da7d9ec9]::iter::adapters::filter_map::FilterMap<alloc[c40375f0f7ff5c91]::vec::into_iter::IntoIter<rustdoc[8f23bbef6cf7efb7]::clean::types::Item>, <rustdoc[8f23bbef6cf7efb7]::formats::cache::CacheBuilder as rustdoc[8f23bbef6cf7efb7]::fold::DocFolder>::fold_inner_recur::{closure#6}>>>::from_iter
  25:     0x55609f7c4b15 - <rustdoc[8f23bbef6cf7efb7]::formats::cache::CacheBuilder as rustdoc[8f23bbef6cf7efb7]::fold::DocFolder>::fold_inner_recur
  26:     0x55609f7c4f3f - <rustdoc[8f23bbef6cf7efb7]::formats::cache::CacheBuilder as rustdoc[8f23bbef6cf7efb7]::fold::DocFolder>::fold_item_recur
  27:     0x55609f7c8a72 - <rustdoc[8f23bbef6cf7efb7]::formats::cache::CacheBuilder as rustdoc[8f23bbef6cf7efb7]::fold::DocFolder>::fold_item
  28:     0x55609f7c61b1 - <rustdoc[8f23bbef6cf7efb7]::formats::cache::Cache>::populate
  29:     0x55609f67bbc9 - <rustc_session[484a5cd1f43b0798]::session::Session>::time::<rustdoc[8f23bbef6cf7efb7]::clean::types::Crate, rustdoc[8f23bbef6cf7efb7]::core::run_global_ctxt::{closure#9}>
  30:     0x55609f70ba7c - rustdoc[8f23bbef6cf7efb7]::core::run_global_ctxt
  31:     0x55609f67cca4 - <rustc_interface[e3f740b58bbe8d54]::passes::QueryContext>::enter::<rustdoc[8f23bbef6cf7efb7]::main_args::{closure#1}::{closure#0}::{closure#1}, core[468623a6da7d9ec9]::result::Result<(), rustc_errors[78faa046e0c9ca7a]::ErrorGuaranteed>>
  32:     0x55609f4ce78a - <rustc_interface[e3f740b58bbe8d54]::interface::Compiler>::enter::<rustdoc[8f23bbef6cf7efb7]::main_args::{closure#1}::{closure#0}, core[468623a6da7d9ec9]::result::Result<(), rustc_errors[78faa046e0c9ca7a]::ErrorGuaranteed>>
  33:     0x55609f61486a - rustc_span[414a16377e6cb62b]::with_source_map::<core[468623a6da7d9ec9]::result::Result<(), rustc_errors[78faa046e0c9ca7a]::ErrorGuaranteed>, rustc_interface[e3f740b58bbe8d54]::interface::run_compiler<core[468623a6da7d9ec9]::result::Result<(), rustc_errors[78faa046e0c9ca7a]::ErrorGuaranteed>, rustdoc[8f23bbef6cf7efb7]::main_args::{closure#1}>::{closure#0}::{closure#0}>
  34:     0x55609f499695 - <scoped_tls[b199c6e77ce176e9]::ScopedKey<rustc_span[414a16377e6cb62b]::SessionGlobals>>::set::<rustc_interface[e3f740b58bbe8d54]::interface::run_compiler<core[468623a6da7d9ec9]::result::Result<(), rustc_errors[78faa046e0c9ca7a]::ErrorGuaranteed>, rustdoc[8f23bbef6cf7efb7]::main_args::{closure#1}>::{closure#0}, core[468623a6da7d9ec9]::result::Result<(), rustc_errors[78faa046e0c9ca7a]::ErrorGuaranteed>>
  35:     0x55609f6270b0 - std[f1a6b9449c89a13c]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[e3f740b58bbe8d54]::util::run_in_thread_pool_with_globals<rustc_interface[e3f740b58bbe8d54]::interface::run_compiler<core[468623a6da7d9ec9]::result::Result<(), rustc_errors[78faa046e0c9ca7a]::ErrorGuaranteed>, rustdoc[8f23bbef6cf7efb7]::main_args::{closure#1}>::{closure#0}, core[468623a6da7d9ec9]::result::Result<(), rustc_errors[78faa046e0c9ca7a]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[468623a6da7d9ec9]::result::Result<(), rustc_errors[78faa046e0c9ca7a]::ErrorGuaranteed>>
  36:     0x55609f7819df - <<std[f1a6b9449c89a13c]::thread::Builder>::spawn_unchecked_<rustc_interface[e3f740b58bbe8d54]::util::run_in_thread_pool_with_globals<rustc_interface[e3f740b58bbe8d54]::interface::run_compiler<core[468623a6da7d9ec9]::result::Result<(), rustc_errors[78faa046e0c9ca7a]::ErrorGuaranteed>, rustdoc[8f23bbef6cf7efb7]::main_args::{closure#1}>::{closure#0}, core[468623a6da7d9ec9]::result::Result<(), rustc_errors[78faa046e0c9ca7a]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[468623a6da7d9ec9]::result::Result<(), rustc_errors[78faa046e0c9ca7a]::ErrorGuaranteed>>::{closure#1} as core[468623a6da7d9ec9]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  37:     0x7f8aae086c53 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h633e4f7ed41b131b
                               at /rustc/92c1937a90e5b6f20fa6e87016d6869da363972e/library/alloc/src/boxed.rs:2000:9
  38:     0x7f8aae086c53 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h46d52a363ffe776a
                               at /rustc/92c1937a90e5b6f20fa6e87016d6869da363972e/library/alloc/src/boxed.rs:2000:9
  39:     0x7f8aae086c53 - std::sys::unix::thread::Thread::new::thread_start::h6d9ed7daf86174ef
                               at /rustc/92c1937a90e5b6f20fa6e87016d6869da363972e/library/std/src/sys/unix/thread.rs:108:17
  40:     0x7f8aa9a7f8fd - <unknown>
  41:     0x7f8aa9b01a60 - <unknown>
  42:                0x0 - <unknown>

error: internal compiler error: unexpected panic

note: 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 1.68.0-nightly (92c1937a9 2022-12-27) running on x86_64-unknown-linux-gnu

query stack during panic:
end of query stack