ICE: does not have a "fn_arg_names"'

[matthiaskrgr]

auto-reduced (treereduce-rust):

use std::ops::Index;

impl<T, F, Idx> Index<Idx> for Map<T, Output> {}

original:

// Test against ICE in #118111

use std::ops::Index;

struct Map<T, F> {
    f: F,
    inner: T,
}

impl<T, F, Idx> Index<Idx> for Map<T, Output>
where
    T: FnOnce(&T, Idx) -> Idx,
    F: FnOnce(&T, Idx) -> Idx
{
    type Output = T::Output;

    fn index(&self, index: Idx) -> &T {
    Map { inner: [0_usize], f: |_, i: usize| 1_usize }[0];
    //~^ ERROR cannot index into a value of type
    // Problem here is that
    //   `f: |_, i: usize| ...`
    // should be
    //   `f: |_: &_, i: usize| ...`
}
}

fn main() {
    Map { 0, f: |_, i: usize| 1_usize }[0];
    //~^ ERROR cannot index into a value of type
    // Problem here is that
    f: |_, i: usize| 1_usize~^ ERROR cannot index into a value of type
    // should be
    //   `f: |_: &_, i: usize| ...`
}

Version information

rustc 1.83.0-nightly (54fdef779 2024-09-06)
binary: rustc
commit-hash: 54fdef7799d9ff9470bb5cabd29fde9471a99eaa
commit-date: 2024-09-06
host: x86_64-unknown-linux-gnu
release: 1.83.0-nightly
LLVM version: 19.1.0

Command:
/home/matthias/.rustup/toolchains/master/bin/rustc

Program output

thread 'rustc' panicked at compiler/rustc_metadata/src/rmeta/decoder/cstore_impl.rs:244:1:
DefId(2:43557 ~ core[ef64]::ops::index::Index::Output) does not have a "fn_arg_names"
stack backtrace:
   0:     0x72aa5404caea - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::ha06606287bbc0d40
   1:     0x72aa548032d7 - core::fmt::write::h900168b8d6b18d0e
   2:     0x72aa55a98b11 - std::io::Write::write_fmt::h37096a98cee6aecc
   3:     0x72aa5404c942 - std::sys::backtrace::BacktraceLock::print::ha41d7d8ec1d7827c
   4:     0x72aa5404ee61 - std::panicking::default_hook::{{closure}}::hca14ab024825d53f
   5:     0x72aa5404ec94 - std::panicking::default_hook::h4858525b39283b35
   6:     0x72aa531646df - std[6d8313e6711de5ec]::panicking::update_hook::<alloc[69e5093c240c6a93]::boxed::Box<rustc_driver_impl[bb97483d227938cc]::install_ice_hook::{closure#0}>>::{closure#0}
   7:     0x72aa5404f588 - std::panicking::rust_panic_with_hook::h018e63ac98cfb250
   8:     0x72aa5404f357 - std::panicking::begin_panic_handler::{{closure}}::h47a7576b8040d795
   9:     0x72aa5404cf99 - std::sys::backtrace::__rust_end_short_backtrace::hb0b79a031dbb259b
  10:     0x72aa5404f024 - rust_begin_unwind
  11:     0x72aa50e8e103 - core::panicking::panic_fmt::hbbbf440be8216850
  12:     0x72aa53717f22 - rustc_metadata[5ce0ef877c353d66]::rmeta::decoder::cstore_impl::provide_extern::fn_arg_names::{closure#2}
  13:     0x72aa53717dae - rustc_metadata[5ce0ef877c353d66]::rmeta::decoder::cstore_impl::provide_extern::fn_arg_names
  14:     0x72aa55d43269 - rustc_query_impl[627e742369ef9b00]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[627e742369ef9b00]::query_impl::fn_arg_names::dynamic_query::{closure#2}::{closure#0}, rustc_middle[7c194d2c51ee7d6b]::query::erase::Erased<[u8; 16usize]>>.cold
  15:     0x72aa54a924d5 - <rustc_query_impl[627e742369ef9b00]::query_impl::fn_arg_names::dynamic_query::{closure#2} as core[ef64e34f4f685035]::ops::function::FnOnce<(rustc_middle[7c194d2c51ee7d6b]::ty::context::TyCtxt, rustc_span[554534721cb6ceca]::def_id::DefId)>>::call_once
  16:     0x72aa54d76a01 - rustc_query_system[989e049842c55218]::query::plumbing::try_execute_query::<rustc_query_impl[627e742369ef9b00]::DynamicConfig<rustc_query_system[989e049842c55218]::query::caches::DefIdCache<rustc_middle[7c194d2c51ee7d6b]::query::erase::Erased<[u8; 16usize]>>, false, false, false>, rustc_query_impl[627e742369ef9b00]::plumbing::QueryCtxt, false>
  17:     0x72aa54d762ee - rustc_query_impl[627e742369ef9b00]::query_impl::fn_arg_names::get_query_non_incr::__rust_end_short_backtrace
  18:     0x72aa54d75163 - rustc_middle[7c194d2c51ee7d6b]::query::plumbing::query_get_at::<rustc_query_system[989e049842c55218]::query::caches::DefIdCache<rustc_middle[7c194d2c51ee7d6b]::query::erase::Erased<[u8; 16usize]>>>
  19:     0x72aa53c56760 - <rustc_resolve[8f914cbac3712a73]::late::LateResolutionVisitor>::try_lookup_name_relaxed
  20:     0x72aa53c4ef91 - <rustc_resolve[8f914cbac3712a73]::late::LateResolutionVisitor>::smart_resolve_report_errors
  21:     0x72aa516b798c - <rustc_resolve[8f914cbac3712a73]::late::LateResolutionVisitor>::smart_resolve_path_fragment::{closure#0}
  22:     0x72aa553564d6 - <rustc_resolve[8f914cbac3712a73]::late::LateResolutionVisitor>::smart_resolve_path_fragment
  23:     0x72aa516af194 - <rustc_resolve[8f914cbac3712a73]::late::LateResolutionVisitor as rustc_ast[4a29b632a72979d1]::visit::Visitor>::visit_ty
  24:     0x72aa5534e4c6 - <rustc_resolve[8f914cbac3712a73]::late::LateResolutionVisitor as rustc_ast[4a29b632a72979d1]::visit::Visitor>::visit_generic_arg
  25:     0x72aa516af7f7 - <rustc_resolve[8f914cbac3712a73]::late::LateResolutionVisitor as rustc_ast[4a29b632a72979d1]::visit::Visitor>::visit_ty
  26:     0x72aa517aecae - <rustc_resolve[8f914cbac3712a73]::late::LateResolutionVisitor as rustc_ast[4a29b632a72979d1]::visit::Visitor>::visit_item
  27:     0x72aa55a19960 - <rustc_resolve[8f914cbac3712a73]::Resolver>::resolve_crate::{closure#0}
  28:     0x72aa55a13dc0 - <rustc_resolve[8f914cbac3712a73]::Resolver>::resolve_crate
  29:     0x72aa54c2443e - rustc_interface[5a709bf0abf5983c]::passes::resolver_for_lowering_raw
  30:     0x72aa54c2365b - rustc_query_impl[627e742369ef9b00]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[627e742369ef9b00]::query_impl::resolver_for_lowering_raw::dynamic_query::{closure#2}::{closure#0}, rustc_middle[7c194d2c51ee7d6b]::query::erase::Erased<[u8; 16usize]>>
  31:     0x72aa54c23649 - <rustc_query_impl[627e742369ef9b00]::query_impl::resolver_for_lowering_raw::dynamic_query::{closure#2} as core[ef64e34f4f685035]::ops::function::FnOnce<(rustc_middle[7c194d2c51ee7d6b]::ty::context::TyCtxt, ())>>::call_once
  32:     0x72aa5575ca92 - rustc_query_system[989e049842c55218]::query::plumbing::try_execute_query::<rustc_query_impl[627e742369ef9b00]::DynamicConfig<rustc_query_system[989e049842c55218]::query::caches::SingleCache<rustc_middle[7c194d2c51ee7d6b]::query::erase::Erased<[u8; 16usize]>>, false, false, false>, rustc_query_impl[627e742369ef9b00]::plumbing::QueryCtxt, false>
  33:     0x72aa5575c72d - rustc_query_impl[627e742369ef9b00]::query_impl::resolver_for_lowering_raw::get_query_non_incr::__rust_end_short_backtrace
  34:     0x72aa555911ee - rustc_interface[5a709bf0abf5983c]::interface::run_compiler::<core[ef64e34f4f685035]::result::Result<(), rustc_span[554534721cb6ceca]::ErrorGuaranteed>, rustc_driver_impl[bb97483d227938cc]::run_compiler::{closure#0}>::{closure#1}
  35:     0x72aa55642490 - std[6d8313e6711de5ec]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[5a709bf0abf5983c]::util::run_in_thread_with_globals<rustc_interface[5a709bf0abf5983c]::util::run_in_thread_pool_with_globals<rustc_interface[5a709bf0abf5983c]::interface::run_compiler<core[ef64e34f4f685035]::result::Result<(), rustc_span[554534721cb6ceca]::ErrorGuaranteed>, rustc_driver_impl[bb97483d227938cc]::run_compiler::{closure#0}>::{closure#1}, core[ef64e34f4f685035]::result::Result<(), rustc_span[554534721cb6ceca]::ErrorGuaranteed>>::{closure#0}, core[ef64e34f4f685035]::result::Result<(), rustc_span[554534721cb6ceca]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[ef64e34f4f685035]::result::Result<(), rustc_span[554534721cb6ceca]::ErrorGuaranteed>>
  36:     0x72aa55642afa - <<std[6d8313e6711de5ec]::thread::Builder>::spawn_unchecked_<rustc_interface[5a709bf0abf5983c]::util::run_in_thread_with_globals<rustc_interface[5a709bf0abf5983c]::util::run_in_thread_pool_with_globals<rustc_interface[5a709bf0abf5983c]::interface::run_compiler<core[ef64e34f4f685035]::result::Result<(), rustc_span[554534721cb6ceca]::ErrorGuaranteed>, rustc_driver_impl[bb97483d227938cc]::run_compiler::{closure#0}>::{closure#1}, core[ef64e34f4f685035]::result::Result<(), rustc_span[554534721cb6ceca]::ErrorGuaranteed>>::{closure#0}, core[ef64e34f4f685035]::result::Result<(), rustc_span[554534721cb6ceca]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[ef64e34f4f685035]::result::Result<(), rustc_span[554534721cb6ceca]::ErrorGuaranteed>>::{closure#1} as core[ef64e34f4f685035]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  37:     0x72aa55642eeb - std::sys::pal::unix::thread::Thread::new::thread_start::h8a408131a034eba4
  38:     0x72aa56cd739d - <unknown>
  39:     0x72aa56d5c49c - <unknown>
  40:                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 1.83.0-nightly (54fdef779 2024-09-06) running on x86_64-unknown-linux-gnu

query stack during panic:
#0 [fn_arg_names] looking up function parameter names for `core::ops::index::Index::Output`
#1 [resolver_for_lowering_raw] getting the resolver for lowering
end of query stack

[matthiaskrgr]

#129829 cc @compiler-errors