ICE: impl_trait_in_params.rs index out of bounds: the len is 0 but the index is 0

[matthiaskrgr]

Summary

pub trait Tr {
    fn f(&self, _x: impl std::fmt::Debug);
}

pub const fn g<T: IntoIterator<Item = impl Iterator<Item = impl Clone>>>() {
    extern "C" fn implementation_detail() {}
}

pub fn main() {}

Version

rustc 1.76.0-nightly (ba7c7a301 2023-11-13)
binary: rustc
commit-hash: ba7c7a301984967c8c13adb580ef9b86ba706a83
commit-date: 2023-11-13
host: x86_64-unknown-linux-gnu
release: 1.76.0-nightly
LLVM version: 17.0.4

Error output

Backtrace

warning: function `implementation_detail` is never used
--> 13D48CD41F5A579A5435E7F9C4FE8065532286F3ACCF4ABA19EF11AF1485BA41.rs:6:19
|
6 |     extern "C" fn implementation_detail() {}
|                   ^^^^^^^^^^^^^^^^^^^^^
|
= note: `#[warn(dead_code)]` on by default

thread 'rustc' panicked at src/tools/clippy/clippy_lints/src/functions/impl_trait_in_params.rs:62:56:
index out of bounds: the len is 0 but the index is 0
stack backtrace:
 0:     0x7f261e18b61c - std::backtrace_rs::backtrace::libunwind::trace::hde577349c76cce7f
                             at /rustc/ba7c7a301984967c8c13adb580ef9b86ba706a83/library/std/src/../../backtrace/src/backtrace/libunwind.rs:104:5
 1:     0x7f261e18b61c - std::backtrace_rs::backtrace::trace_unsynchronized::h9b71754079dc3035
                             at /rustc/ba7c7a301984967c8c13adb580ef9b86ba706a83/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
 2:     0x7f261e18b61c - std::sys_common::backtrace::_print_fmt::hb33349ab29b20866
                             at /rustc/ba7c7a301984967c8c13adb580ef9b86ba706a83/library/std/src/sys_common/backtrace.rs:67:5
 3:     0x7f261e18b61c - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hbc5b9509b803594e
                             at /rustc/ba7c7a301984967c8c13adb580ef9b86ba706a83/library/std/src/sys_common/backtrace.rs:44:22
 4:     0x7f261e1de620 - core::fmt::rt::Argument::fmt::h33b657cf79c72a38
                             at /rustc/ba7c7a301984967c8c13adb580ef9b86ba706a83/library/core/src/fmt/rt.rs:142:9
 5:     0x7f261e1de620 - core::fmt::write::h2084c637086086bf
                             at /rustc/ba7c7a301984967c8c13adb580ef9b86ba706a83/library/core/src/fmt/mod.rs:1120:17
 6:     0x7f261e17f53f - std::io::Write::write_fmt::h98ebe433443fcce9
                             at /rustc/ba7c7a301984967c8c13adb580ef9b86ba706a83/library/std/src/io/mod.rs:1762:15
 7:     0x7f261e18b404 - std::sys_common::backtrace::_print::h15f76b394abd2e8f
                             at /rustc/ba7c7a301984967c8c13adb580ef9b86ba706a83/library/std/src/sys_common/backtrace.rs:47:5
 8:     0x7f261e18b404 - std::sys_common::backtrace::print::h481d1b21ddf00e0c
                             at /rustc/ba7c7a301984967c8c13adb580ef9b86ba706a83/library/std/src/sys_common/backtrace.rs:34:9
 9:     0x7f261e18e097 - std::panicking::default_hook::{{closure}}::hd3d3c641e5c130c3
10:     0x7f261e18ddff - std::panicking::default_hook::h7bca2f08153ccf97
                             at /rustc/ba7c7a301984967c8c13adb580ef9b86ba706a83/library/std/src/panicking.rs:292:9
11:     0x7f2620eed050 - std[70c331c52e792e77]::panicking::update_hook::<alloc[ac42baf6c7d94bfa]::boxed::Box<rustc_driver_impl[662ed899c4750396]::install_ice_hook::{closure#0}>>::{closure#0}
12:     0x7f261e18e7d8 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h01a2b076b44e44f8
                             at /rustc/ba7c7a301984967c8c13adb580ef9b86ba706a83/library/alloc/src/boxed.rs:2021:9
13:     0x7f261e18e7d8 - std::panicking::rust_panic_with_hook::h24b0c40fd36c8eee
                             at /rustc/ba7c7a301984967c8c13adb580ef9b86ba706a83/library/std/src/panicking.rs:783:13
14:     0x7f261e18e52e - std::panicking::begin_panic_handler::{{closure}}::hf0b52c49926ec9f4
                             at /rustc/ba7c7a301984967c8c13adb580ef9b86ba706a83/library/std/src/panicking.rs:657:13
15:     0x7f261e18bae6 - std::sys_common::backtrace::__rust_end_short_backtrace::h7112d64e85585c9d
                             at /rustc/ba7c7a301984967c8c13adb580ef9b86ba706a83/library/std/src/sys_common/backtrace.rs:170:18
16:     0x7f261e18e292 - rust_begin_unwind
                             at /rustc/ba7c7a301984967c8c13adb580ef9b86ba706a83/library/std/src/panicking.rs:645:5
17:     0x7f261e1dad05 - core::panicking::panic_fmt::h2c71ea7e0c1376d6
                             at /rustc/ba7c7a301984967c8c13adb580ef9b86ba706a83/library/core/src/panicking.rs:72:14
18:     0x7f261e1daf22 - core::panicking::panic_bounds_check::h8ec866ccff4594c8
                             at /rustc/ba7c7a301984967c8c13adb580ef9b86ba706a83/library/core/src/panicking.rs:190:5
19:     0x560dec5e5465 - <clippy_lints[880b205496813fba]::functions::Functions as rustc_lint[af10f8c98ce8832b]::passes::LateLintPass>::check_fn
20:     0x7f2621295965 - <rustc_lint[af10f8c98ce8832b]::late::LateContextAndPass<rustc_lint[af10f8c98ce8832b]::late::RuntimeCombinedLateLintPass> as rustc_hir[ce20da1fc47864e6]::intravisit::Visitor>::visit_fn
21:     0x7f2621294085 - <rustc_lint[af10f8c98ce8832b]::late::LateContextAndPass<rustc_lint[af10f8c98ce8832b]::late::RuntimeCombinedLateLintPass> as rustc_hir[ce20da1fc47864e6]::intravisit::Visitor>::visit_item
22:     0x7f2621295d0a - <rustc_lint[af10f8c98ce8832b]::late::LateContextAndPass<rustc_lint[af10f8c98ce8832b]::late::RuntimeCombinedLateLintPass> as rustc_hir[ce20da1fc47864e6]::intravisit::Visitor>::visit_mod
23:     0x7f2622bf3fa7 - rustc_lint[af10f8c98ce8832b]::late::check_crate::{closure#0}
24:     0x7f2622bf41fa - rustc_lint[af10f8c98ce8832b]::late::check_crate
25:     0x7f262255cb17 - rustc_interface[7bd5efb410cadaba]::passes::analysis
26:     0x7f262255bbb7 - rustc_query_impl[6e3ec7c8d4ef4986]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[6e3ec7c8d4ef4986]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[991180616cb4918b]::query::erase::Erased<[u8; 1usize]>>
27:     0x7f2623199064 - rustc_query_system[16adaf3b80342c]::query::plumbing::try_execute_query::<rustc_query_impl[6e3ec7c8d4ef4986]::DynamicConfig<rustc_query_system[16adaf3b80342c]::query::caches::SingleCache<rustc_middle[991180616cb4918b]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[6e3ec7c8d4ef4986]::plumbing::QueryCtxt, false>
28:     0x7f2623198e55 - rustc_query_impl[6e3ec7c8d4ef4986]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
29:     0x7f26231a1a7f - rustc_interface[7bd5efb410cadaba]::interface::run_compiler::<core[4823536d104e8f97]::result::Result<(), rustc_span[43b04719702b35f]::ErrorGuaranteed>, rustc_driver_impl[662ed899c4750396]::run_compiler::{closure#1}>::{closure#0}
30:     0x7f26231a8d99 - std[70c331c52e792e77]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[7bd5efb410cadaba]::util::run_in_thread_with_globals<rustc_interface[7bd5efb410cadaba]::util::run_in_thread_pool_with_globals<rustc_interface[7bd5efb410cadaba]::interface::run_compiler<core[4823536d104e8f97]::result::Result<(), rustc_span[43b04719702b35f]::ErrorGuaranteed>, rustc_driver_impl[662ed899c4750396]::run_compiler::{closure#1}>::{closure#0}, core[4823536d104e8f97]::result::Result<(), rustc_span[43b04719702b35f]::ErrorGuaranteed>>::{closure#0}, core[4823536d104e8f97]::result::Result<(), rustc_span[43b04719702b35f]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[4823536d104e8f97]::result::Result<(), rustc_span[43b04719702b35f]::ErrorGuaranteed>>
31:     0x7f26231a8bc3 - <<std[70c331c52e792e77]::thread::Builder>::spawn_unchecked_<rustc_interface[7bd5efb410cadaba]::util::run_in_thread_with_globals<rustc_interface[7bd5efb410cadaba]::util::run_in_thread_pool_with_globals<rustc_interface[7bd5efb410cadaba]::interface::run_compiler<core[4823536d104e8f97]::result::Result<(), rustc_span[43b04719702b35f]::ErrorGuaranteed>, rustc_driver_impl[662ed899c4750396]::run_compiler::{closure#1}>::{closure#0}, core[4823536d104e8f97]::result::Result<(), rustc_span[43b04719702b35f]::ErrorGuaranteed>>::{closure#0}, core[4823536d104e8f97]::result::Result<(), rustc_span[43b04719702b35f]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[4823536d104e8f97]::result::Result<(), rustc_span[43b04719702b35f]::ErrorGuaranteed>>::{closure#1} as core[4823536d104e8f97]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
32:     0x7f261e198695 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hee7d8415653916ee
                             at /rustc/ba7c7a301984967c8c13adb580ef9b86ba706a83/library/alloc/src/boxed.rs:2007:9
33:     0x7f261e198695 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hf8af5df67977eb57
                             at /rustc/ba7c7a301984967c8c13adb580ef9b86ba706a83/library/alloc/src/boxed.rs:2007:9
34:     0x7f261e198695 - std::sys::unix::thread::Thread::new::thread_start::hc878850cbd82a8f9
                             at /rustc/ba7c7a301984967c8c13adb580ef9b86ba706a83/library/std/src/sys/unix/thread.rs:108:17
35:     0x7f261de9c9eb - <unknown>
36:     0x7f261df207cc - <unknown>
37:                0x0 - <unknown>

error: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust-clippy/issues/new?template=ice.yml

note: please attach the file at `/tmp/icemaker/rustc-ice-2023-11-14T05_58_05-2645708.txt` to your bug report

query stack during panic:
#0 [analysis] running analysis passes on this crate
end of query stack
note: Clippy version: clippy 0.1.75 (ba7c7a3 2023-11-13)

warning: 1 warning emitted