error: `&'static [u8; 4]` is forbidden as the type of a const generic parameter --> /tmp/icemaker_global_tempdir.UIvWXNcW58ZC/rustc_testrunner_tmpdir_reporting.bReUy5HRdRlL/mvce.rs:1:41 | 1 | pub fn function_with_bytes<const BYTES: &'static [u8; 4]>() -> &'static [u8] { | ^^^^^^^^^^^^^^^^ | = note: the only supported types are integers, `bool` and `char` help: add `#![feature(adt_const_params)]` to the crate attributes to enable more complex and user defined types | 1 + #![feature(adt_const_params)] | help: add `#![feature(unsized_const_params)]` to the crate attributes to enable references to implement the `ConstParamTy` trait | 1 + #![feature(unsized_const_params)] | error[E0308]: mismatched types --> /tmp/icemaker_global_tempdir.UIvWXNcW58ZC/rustc_testrunner_tmpdir_reporting.bReUy5HRdRlL/mvce.rs:6:38 | 6 | assert_eq!(function_with_bytes::<b"AAAAb">(), &[0x41, 0x41, 0x41, 0x41]); | ^^^^^^^^ expected an array with a fixed size of 4 elements, found one with 5 elements thread 'rustc' panicked at compiler/rustc_const_eval/src/const_eval/valtrees.rs:433:60: called `Result::unwrap()` on an `Err` value: InterpErrorInfo(InterpErrorInfoInner { kind: UndefinedBehavior(BoundsCheckFailed { len: 4, index: 4 }), backtrace: InterpErrorBacktrace { backtrace: None } }) stack backtrace: 0: 0x73319a7b666d - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::h560b4d28c137b093 1: 0x73319b004f2f - core::fmt::write::h99766545c4efef9d 2: 0x73319bfb0ed1 - std::io::Write::write_fmt::h8e3cbf6208612263 3: 0x73319a7b8d4b - std::panicking::default_hook::{{closure}}::h6bf6ccd32e88a7b7 4: 0x73319a7b89be - std::panicking::default_hook::ha56d0025017107a4 5: 0x733199946299 - std[265a0665abe5e043]::panicking::update_hook::<alloc[f7eab8ff756c9dca]::boxed::Box<rustc_driver_impl[18c1de8e11281817]::install_ice_hook::{closure#0}>>::{closure#0} 6: 0x73319a7b9667 - std::panicking::rust_panic_with_hook::h53b891e816ad5807 7: 0x73319a7b9327 - std::panicking::begin_panic_handler::{{closure}}::h3012610e5c310f7d 8: 0x73319a7b6b29 - std::sys::backtrace::__rust_end_short_backtrace::h66811dbaa784350e 9: 0x73319a7b8ff4 - rust_begin_unwind 10: 0x733197699b63 - core::panicking::panic_fmt::he2d7dd7c7f53990c 11: 0x733197772286 - core::result::unwrap_failed::h5d31905b634d5ea8 12: 0x73319bd23d85 - rustc_const_eval[4703571d7d15c956]::const_eval::valtrees::valtree_into_mplace 13: 0x73319bd2381b - rustc_const_eval[4703571d7d15c956]::const_eval::valtrees::valtree_to_ref 14: 0x73319bc017a6 - rustc_const_eval[4703571d7d15c956]::const_eval::valtrees::valtree_to_const_value 15: 0x73319bc01561 - <rustc_const_eval[4703571d7d15c956]::provide::{closure#1} as core[12164080e42249fc]::ops::function::FnOnce<(rustc_middle[d7f4792719c666e4]::ty::context::TyCtxt, (rustc_middle[d7f4792719c666e4]::ty::Ty, rustc_middle[d7f4792719c666e4]::ty::consts::valtree::ValTree))>>::call_once 16: 0x73319bc0152e - rustc_query_impl[c2f5f95cecf69337]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[c2f5f95cecf69337]::query_impl::valtree_to_const_val::dynamic_query::{closure#2}::{closure#0}, rustc_middle[d7f4792719c666e4]::query::erase::Erased<[u8; 24usize]>> 17: 0x73319bc014e7 - <rustc_query_impl[c2f5f95cecf69337]::query_impl::valtree_to_const_val::dynamic_query::{closure#2} as core[12164080e42249fc]::ops::function::FnOnce<(rustc_middle[d7f4792719c666e4]::ty::context::TyCtxt, (rustc_middle[d7f4792719c666e4]::ty::Ty, rustc_middle[d7f4792719c666e4]::ty::consts::valtree::ValTree))>>::call_once 18: 0x73319bc005ba - rustc_query_system[f8c10878fe801c76]::query::plumbing::try_execute_query::<rustc_query_impl[c2f5f95cecf69337]::DynamicConfig<rustc_query_system[f8c10878fe801c76]::query::caches::DefaultCache<(rustc_middle[d7f4792719c666e4]::ty::Ty, rustc_middle[d7f4792719c666e4]::ty::consts::valtree::ValTree), rustc_middle[d7f4792719c666e4]::query::erase::Erased<[u8; 24usize]>>, false, false, false>, rustc_query_impl[c2f5f95cecf69337]::plumbing::QueryCtxt, false> 19: 0x73319bc0030a - rustc_query_impl[c2f5f95cecf69337]::query_impl::valtree_to_const_val::get_query_non_incr::__rust_end_short_backtrace 20: 0x73319bab3781 - <rustc_mir_transform[4b24bac2940eeb7a]::gvn::VnState>::insert 21: 0x73319baab3fd - <rustc_mir_transform[4b24bac2940eeb7a]::gvn::VnState>::simplify_operand 22: 0x73319baa9718 - <rustc_mir_transform[4b24bac2940eeb7a]::gvn::VnState>::simplify_rvalue 23: 0x733198b21d20 - <rustc_mir_transform[4b24bac2940eeb7a]::gvn::GVN as rustc_middle[d7f4792719c666e4]::mir::MirPass>::run_pass 24: 0x73319b002151 - rustc_mir_transform[4b24bac2940eeb7a]::pass_manager::run_passes_inner 25: 0x73319bb2ccb3 - rustc_mir_transform[4b24bac2940eeb7a]::optimized_mir 26: 0x73319bb5039b - rustc_query_impl[c2f5f95cecf69337]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[c2f5f95cecf69337]::query_impl::optimized_mir::dynamic_query::{closure#2}::{closure#0}, rustc_middle[d7f4792719c666e4]::query::erase::Erased<[u8; 8usize]>> 27: 0x73319b02af27 - rustc_query_system[f8c10878fe801c76]::query::plumbing::try_execute_query::<rustc_query_impl[c2f5f95cecf69337]::DynamicConfig<rustc_query_system[f8c10878fe801c76]::query::caches::DefIdCache<rustc_middle[d7f4792719c666e4]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[c2f5f95cecf69337]::plumbing::QueryCtxt, false> 28: 0x73319b02a4df - rustc_query_impl[c2f5f95cecf69337]::query_impl::optimized_mir::get_query_non_incr::__rust_end_short_backtrace 29: 0x733197984814 - <rustc_middle[d7f4792719c666e4]::ty::context::TyCtxt>::instance_mir 30: 0x73319b3b63f9 - rustc_interface[8b2190a255f69c87]::passes::run_required_analyses 31: 0x73319bb663de - rustc_interface[8b2190a255f69c87]::passes::analysis 32: 0x73319bb663b1 - rustc_query_impl[c2f5f95cecf69337]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[c2f5f95cecf69337]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[d7f4792719c666e4]::query::erase::Erased<[u8; 1usize]>> 33: 0x73319bf706ee - rustc_query_system[f8c10878fe801c76]::query::plumbing::try_execute_query::<rustc_query_impl[c2f5f95cecf69337]::DynamicConfig<rustc_query_system[f8c10878fe801c76]::query::caches::SingleCache<rustc_middle[d7f4792719c666e4]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[c2f5f95cecf69337]::plumbing::QueryCtxt, false> 34: 0x73319bf7044f - rustc_query_impl[c2f5f95cecf69337]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace 35: 0x73319bddd169 - rustc_interface[8b2190a255f69c87]::interface::run_compiler::<core[12164080e42249fc]::result::Result<(), rustc_span[e524fe640245e945]::ErrorGuaranteed>, rustc_driver_impl[18c1de8e11281817]::run_compiler::{closure#0}>::{closure#1} 36: 0x73319bd025d0 - std[265a0665abe5e043]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[8b2190a255f69c87]::util::run_in_thread_with_globals<rustc_interface[8b2190a255f69c87]::util::run_in_thread_pool_with_globals<rustc_interface[8b2190a255f69c87]::interface::run_compiler<core[12164080e42249fc]::result::Result<(), rustc_span[e524fe640245e945]::ErrorGuaranteed>, rustc_driver_impl[18c1de8e11281817]::run_compiler::{closure#0}>::{closure#1}, core[12164080e42249fc]::result::Result<(), rustc_span[e524fe640245e945]::ErrorGuaranteed>>::{closure#0}, core[12164080e42249fc]::result::Result<(), rustc_span[e524fe640245e945]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[12164080e42249fc]::result::Result<(), rustc_span[e524fe640245e945]::ErrorGuaranteed>> 37: 0x73319bd02c3a - <<std[265a0665abe5e043]::thread::Builder>::spawn_unchecked_<rustc_interface[8b2190a255f69c87]::util::run_in_thread_with_globals<rustc_interface[8b2190a255f69c87]::util::run_in_thread_pool_with_globals<rustc_interface[8b2190a255f69c87]::interface::run_compiler<core[12164080e42249fc]::result::Result<(), rustc_span[e524fe640245e945]::ErrorGuaranteed>, rustc_driver_impl[18c1de8e11281817]::run_compiler::{closure#0}>::{closure#1}, core[12164080e42249fc]::result::Result<(), rustc_span[e524fe640245e945]::ErrorGuaranteed>>::{closure#0}, core[12164080e42249fc]::result::Result<(), rustc_span[e524fe640245e945]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[12164080e42249fc]::result::Result<(), rustc_span[e524fe640245e945]::ErrorGuaranteed>>::{closure#1} as core[12164080e42249fc]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0} 38: 0x73319bd02fab - std::sys::pal::unix::thread::Thread::new::thread_start::hbf34cdaead1142d4 39: 0x73319d45539d - <unknown> 40: 0x73319d4da49c - <unknown> 41: 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 1.82.0-nightly (fbce03b19 2024-08-14) running on x86_64-unknown-linux-gnu note: compiler flags: -Z mir-opt-level=5 -Z validate-mir -Z dump-mir-dir=dir query stack during panic: #0 [valtree_to_const_val] converting type-level constant value to mir constant value #1 [optimized_mir] optimizing MIR for `main` end of query stack error: aborting due to 2 previous errors For more information about this error, try `rustc --explain E0308`.