panic: index out of bounds: the len is 1 but the index is 1' consts.rs:354:77

[matthiaskrgr]

code from rustc src/test/ui/associated-const/issue-69020-assoc-const-arith-overflow.rs

pub fn main() {}

pub trait Foo {
    const OOB: i32;
}

impl<T: Foo> Foo for Vec<T> {
    const OOB: i32 = [1][1] + T::OOB;
    //~^ ERROR operation will panic
}

thread 'rustc' panicked at 'index out of bounds: the len is 1 but the index is 1', src/tools/clippy/clippy_lints/src/consts.rs:354:77
stack backtrace:
   0:     0x7fcbd01c2b14 - backtrace::backtrace::libunwind::trace::h7bba70f7ded37b1a
                               at /cargo/registry/src/git.luolix.top-1ecc6299db9ec823/backtrace-0.3.46/src/backtrace/libunwind.rs:86
   1:     0x7fcbd01c2b14 - backtrace::backtrace::trace_unsynchronized::hbc2a98ef03b9b628
                               at /cargo/registry/src/git.luolix.top-1ecc6299db9ec823/backtrace-0.3.46/src/backtrace/mod.rs:66
   2:     0x7fcbd01c2b14 - std::sys_common::backtrace::_print_fmt::h53c3bbd997b3e6e1
                               at src/libstd/sys_common/backtrace.rs:78
   3:     0x7fcbd01c2b14 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h3036d02651b66f16
                               at src/libstd/sys_common/backtrace.rs:59
   4:     0x7fcbd02010ec - core::fmt::write::he7ad59d56ec03526
                               at src/libcore/fmt/mod.rs:1069
   5:     0x7fcbd01b4563 - std::io::Write::write_fmt::h3420fa1775e02fea
                               at src/libstd/io/mod.rs:1504
   6:     0x7fcbd01c7b15 - std::sys_common::backtrace::_print::he2dbb58105bd7d63
                               at src/libstd/sys_common/backtrace.rs:62
   7:     0x7fcbd01c7b15 - std::sys_common::backtrace::print::h2ea64c440ed8582c
                               at src/libstd/sys_common/backtrace.rs:49
   8:     0x7fcbd01c7b15 - std::panicking::default_hook::{{closure}}::h1c2bdeaadb5ce59b
                               at src/libstd/panicking.rs:198
   9:     0x7fcbd01c7852 - std::panicking::default_hook::h24ef3f3ac24d2c0e
                               at src/libstd/panicking.rs:218
  10:     0x55b4647aba11 - clippy_driver::report_clippy_ice::hce5ad5b9f956cbc4
  11:     0x7fcbd01c8295 - std::panicking::rust_panic_with_hook::hde7d2e36d005bc1b
                               at src/libstd/panicking.rs:515
  12:     0x7fcbd01c7dab - rust_begin_unwind
                               at src/libstd/panicking.rs:419
  13:     0x7fcbd01fdd81 - core::panicking::panic_fmt::h2ec72744b1a0689c
                               at src/libcore/panicking.rs:111
  14:     0x7fcbd01fdd42 - core::panicking::panic_bounds_check::hef4d21592baf7399
                               at src/libcore/panicking.rs:69
  15:     0x55b46492ee71 - clippy_lints::consts::ConstEvalLateContext::expr::hc388c1d4fd392c84
  16:     0x55b4648a066c - clippy_lints::identity_op::check::h2e812aca765489ef
  17:     0x55b4648a0514 - <clippy_lints::identity_op::IdentityOp as rustc_lint::passes::LateLintPass>::check_expr::h5a4bcc03e98b25be
  18:     0x7fcbd23f0ce3 - <rustc_lint::late::LateLintPassObjects as rustc_lint::passes::LateLintPass>::check_expr::hd8f2520fadbc5228
  19:     0x7fcbd0a71e82 - <rustc_lint::late::LateContextAndPass<T> as rustc_hir::intravisit::Visitor>::visit_expr::hf92cd1bba4b1fc8c
  20:     0x7fcbd0a727e6 - <rustc_lint::late::LateContextAndPass<T> as rustc_hir::intravisit::Visitor>::visit_nested_body::hb2f8b6ebcefa4d7c
  21:     0x7fcbd0a74750 - rustc_hir::intravisit::Visitor::visit_nested_impl_item::haaeb666cc77c146b
  22:     0x7fcbd0a3af40 - rustc_hir::intravisit::walk_item::h2fe2c74431d7bfad
  23:     0x7fcbd0a73fa8 - rustc_hir::intravisit::Visitor::visit_nested_item::h5efe0571ee5e02ba
  24:     0x7fcbd0a3482e - rustc_hir::intravisit::walk_crate::h121a9f4db6eb3af1
  25:     0x7fcbd0a4ec4f - rustc_lint::late::late_lint_pass_crate::h3ce5c658f5bd5787
  26:     0x7fcbd0a50dd0 - rustc_session::utils::<impl rustc_session::session::Session>::time::h01e6bb092c3dd6bb
  27:     0x7fcbd0a4d054 - <std::panic::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::h259244b8d551effc
  28:     0x7fcbd0a4d840 - <std::panic::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::h8c4cd027ccb7a6fb
  29:     0x7fcbd0a51878 - rustc_session::utils::<impl rustc_session::session::Session>::time::h08f4f2bc17c9fbd6
  30:     0x7fcbd0ab6d04 - rustc_interface::passes::analysis::hba604b22f2d83c77
  31:     0x7fcbd077cb6b - rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::analysis>::compute::h96f19701d405050f
  32:     0x7fcbd08ab787 - rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl::hc272ec8a37831d13
  33:     0x7fcbd077ee5c - rustc_query_system::query::plumbing::get_query::hc2d771b6d5bde200
  34:     0x7fcbd08e18e7 - rustc_middle::ty::context::tls::enter_global::h51ccd7b8ef171497
  35:     0x7fcbd08b8bb5 - rustc_interface::interface::run_compiler_in_existing_thread_pool::hc2d2b0461abde8c3
  36:     0x7fcbd076d0dd - scoped_tls::ScopedKey<T>::set::h5b416022bdfe1862
  37:     0x7fcbd0769a64 - rustc_ast::attr::with_globals::he6d5f98a6db16af6
  38:     0x7fcbd0774f24 - std::sys_common::backtrace::__rust_begin_short_backtrace::hb4b411189be36ab3
  39:     0x7fcbd08bb6ee - core::ops::function::FnOnce::call_once{{vtable.shim}}::h10154aec77bcc0bf
  40:     0x7fcbd01a3edf - <alloc::boxed::Box<F> as core::ops::function::FnOnce<A>>::call_once::ha8178d8e7d3a3960
                               at /rustc/dbf8b6bf116c7bece2987ff4bd2792f008a6ee77/src/liballoc/boxed.rs:1008
  41:     0x7fcbd01d8303 - <alloc::boxed::Box<F> as core::ops::function::FnOnce<A>>::call_once::h0f8f9fd9eb599d28
                               at /rustc/dbf8b6bf116c7bece2987ff4bd2792f008a6ee77/src/liballoc/boxed.rs:1008
  42:     0x7fcbd01d8303 - std::sys::unix::thread::Thread::new::thread_start::h65556e407d591283
                               at src/libstd/sys/unix/thread.rs:87
  43:     0x7fcbd00e946f - start_thread
  44:     0x7fcbcffff3d3 - clone
  45:                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-clippy/issues/new

note: Clippy version: clippy 0.0.212 (891e1a8 2020-04-18)

query stack during panic:
#0 [analysis] running analysis passes on this crate
end of query stack

clippy 0.0.212 (891e1a8 2020-04-18)