ICE: kcfi: encode_const: unexpected kind `UnevaluatedConst { .. }`

auto-reduced (treereduce-rust):

#![feature(generic_const_exprs, generic_arg_infer)]

use core::mem::MaybeUninit;

pub struct Arr<T, const N: usize> {
    v: [MaybeUninit<T>; N],
}

impl<T, const N: usize> Arr<T, N> {
    const ELEM: MaybeUninit<T> = MaybeUninit::uninit();
    const INIT: [MaybeUninit<T>; N] = [Self::ELEM; N];

    fn new() -> Self {
        Arr { v: Self::INIT }
    }
}

pub struct BaFormatFilter<const N: usize> {}

pub enum DigitalFilter<const N: usize>
where
    [(); N * 2 + 1]: Sized,
    [(); N * 2]: Sized,
{
    Ba(BaFormatFilter<{ N * 2 + 1 }>),
}

pub fn iirfilter_st_copy<const N: usize, const M: usize>(_: [f32; M]) -> DigitalFilter<N>
where
    [(); N * 2 + 1]: Sized,
    [(); N * 2]: Sized,
{
    let zpk = zpk2tf_st(&Arr::<f32, { N * 2 }>::new(), &Arr::<f32, { N * 2 }>::new());
    DigitalFilter::Ba(zpk)
}

pub fn zpk2tf_st<const N: usize>(_z: &Arr<f32, N>, _p: &Arr<f32, N>) -> BaFormatFilter<{ N + 1 }> {
    BaFormatFilter {}
}

fn main() {
    iirfilter_st_copy::<4, 2>([10., 50.]);
}

original code

original: ````rust // issue: rust-lang/rust#106423 // ICE collection encountered polymorphic constant: UnevaluatedConst {..} //@ edition:2021 //@ check-pass #![feature(generic_const_exprs, generic_arg_infer)] #![allow(incomplete_features)] #![allow(unused)] use core::mem::MaybeUninit; pub struct Arr { v: [MaybeUninit; N], } impl Arr { const ELEM: MaybeUninit = MaybeUninit::uninit(); const INIT: [MaybeUninit; N] = [Self::ELEM; N]; // important for optimization of `new` fn new() -> Self { Arr { v: Self::INIT } } } pub struct BaFormatFilter {} pub enum DigitalFilter where [(); N * 2 + 1]: Sized, [(); N * 2]: Sized, { Ba(BaFormatFilter<{ N * 2 + 1 }>), } pub fn iirfilter_st_copy(_: [f32; M]) -> DigitalFilter where [(); N * 2 + 1]: Sized, [(); N * 2]: Sized, { let zpk = zpk2tf_st(&Arr::::new(), &Arr::::new()); DigitalFilter::Ba(zpk) } pub fn zpk2tf_st( _z: &Arr, _p: &Arr, ) -> BaFormatFilter<{ N + 1 }> where [(); N + 1]: Sized, { BaFormatFilter {} } fn main() { iirfilter_st_copy::<4, 2>([10., 50.,]); } ````

Version information

rustc 1.81.0-nightly (7bb0ef490 2024-06-09)
binary: rustc
commit-hash: 7bb0ef4902e43f338aa73c3ff728bea3cb9ecf6a
commit-date: 2024-06-09
host: x86_64-unknown-linux-gnu
release: 1.81.0-nightly
LLVM version: 18.1.7

Command: /home/matthias/.rustup/toolchains/master/bin/rustc -Zsanitizer=kcfi -Cpanic=abort --edition=2018

Program output

``` warning: the feature `generic_const_exprs` is incomplete and may not be safe to use and/or cause compiler crashes --> /tmp/icemaker_global_tempdir.gDgKBFsvnsak/rustc_testrunner_tmpdir_reporting.MRWKJmBGzCHY/mvce.rs:1:12 | 1 | #![feature(generic_const_exprs, generic_arg_infer)] | ^^^^^^^^^^^^^^^^^^^ | = note: see issue #76560 for more information = note: `#[warn(incomplete_features)]` on by default warning: field `v` is never read --> /tmp/icemaker_global_tempdir.gDgKBFsvnsak/rustc_testrunner_tmpdir_reporting.MRWKJmBGzCHY/mvce.rs:6:5 | 5 | pub struct Arr { | --- field in this struct 6 | v: [MaybeUninit; N], | ^ | = note: `#[warn(dead_code)]` on by default error: internal compiler error: compiler/rustc_sanitizers/src/cfi/typeid/itanium_cxx_abi/encode.rs:158:13: encode_const: unexpected kind `UnevaluatedConst { def: DefId(0:37 ~ mvce[64a8]::zpk2tf_st::{constant#0}), args: [(Mul: (4_usize: usize), (2_usize: usize))] }` thread 'rustc' panicked at compiler/rustc_sanitizers/src/cfi/typeid/itanium_cxx_abi/encode.rs:158:13: Box stack backtrace: 0: 0x78e6f81a5f15 - std::backtrace_rs::backtrace::libunwind::trace::heabb972c4bf30194 at /rustc/7bb0ef4902e43f338aa73c3ff728bea3cb9ecf6a/library/std/src/../../backtrace/src/backtrace/libunwind.rs:116:5 1: 0x78e6f81a5f15 - std::backtrace_rs::backtrace::trace_unsynchronized::h4ba1442eaca1bb10 at /rustc/7bb0ef4902e43f338aa73c3ff728bea3cb9ecf6a/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5 2: 0x78e6f81a5f15 - std::sys_common::backtrace::_print_fmt::h4d12f471d77196b5 at /rustc/7bb0ef4902e43f338aa73c3ff728bea3cb9ecf6a/library/std/src/sys_common/backtrace.rs:68:5 3: 0x78e6f81a5f15 - ::fmt::hdafa2e62094a2544 at /rustc/7bb0ef4902e43f338aa73c3ff728bea3cb9ecf6a/library/std/src/sys_common/backtrace.rs:44:22 4: 0x78e6f81f6c5b - core::fmt::rt::Argument::fmt::h3bdee6e081605bf4 at /rustc/7bb0ef4902e43f338aa73c3ff728bea3cb9ecf6a/library/core/src/fmt/rt.rs:165:63 5: 0x78e6f81f6c5b - core::fmt::write::h3a87f6a731d66d11 at /rustc/7bb0ef4902e43f338aa73c3ff728bea3cb9ecf6a/library/core/src/fmt/mod.rs:1168:21 6: 0x78e6f819abef - std::io::Write::write_fmt::h639f79d09cf27b23 at /rustc/7bb0ef4902e43f338aa73c3ff728bea3cb9ecf6a/library/std/src/io/mod.rs:1835:15 7: 0x78e6f81a5cee - std::sys_common::backtrace::_print::h8440f387a509d641 at /rustc/7bb0ef4902e43f338aa73c3ff728bea3cb9ecf6a/library/std/src/sys_common/backtrace.rs:47:5 8: 0x78e6f81a5cee - std::sys_common::backtrace::print::haf9fb54157ed196a at /rustc/7bb0ef4902e43f338aa73c3ff728bea3cb9ecf6a/library/std/src/sys_common/backtrace.rs:34:9 9: 0x78e6f81a8729 - std::panicking::default_hook::{{closure}}::ha531e390acdea902 10: 0x78e6f81a84ca - std::panicking::default_hook::h47e5185002a51d52 at /rustc/7bb0ef4902e43f338aa73c3ff728bea3cb9ecf6a/library/std/src/panicking.rs:298:9 11: 0x78e6f49d673f - std[3073bd340ab08955]::panicking::update_hook::>::{closure#0} 12: 0x78e6f81a8e5b - as core::ops::function::Fn>::call::h32e30fee99996214 at /rustc/7bb0ef4902e43f338aa73c3ff728bea3cb9ecf6a/library/alloc/src/boxed.rs:2077:9 13: 0x78e6f81a8e5b - std::panicking::rust_panic_with_hook::h73cccfbddee60476 at /rustc/7bb0ef4902e43f338aa73c3ff728bea3cb9ecf6a/library/std/src/panicking.rs:799:13 14: 0x78e6f4a06f84 - std[3073bd340ab08955]::panicking::begin_panic::::{closure#0} 15: 0x78e6f4a03a66 - std[3073bd340ab08955]::sys_common::backtrace::__rust_end_short_backtrace::::{closure#0}, !> 16: 0x78e6f49fee46 - std[3073bd340ab08955]::panicking::begin_panic:: 17: 0x78e6f4a105a1 - ::emit_producing_guarantee 18: 0x78e6f4ef9b3c - rustc_middle[a5a7a5d95a79c83]::util::bug::opt_span_bug_fmt::::{closure#0} 19: 0x78e6f4ee2c6a - rustc_middle[a5a7a5d95a79c83]::ty::context::tls::with_opt::::{closure#0}, !>::{closure#0} 20: 0x78e6f4ee2b0b - rustc_middle[a5a7a5d95a79c83]::ty::context::tls::with_context_opt::::{closure#0}, !>::{closure#0}, !> 21: 0x78e6f33fcc50 - rustc_middle[a5a7a5d95a79c83]::util::bug::bug_fmt 22: 0x78e6f538582a - rustc_sanitizers[9a055dd07b406515]::cfi::typeid::itanium_cxx_abi::encode::encode_const 23: 0x78e6f5385228 - rustc_sanitizers[9a055dd07b406515]::cfi::typeid::itanium_cxx_abi::encode::encode_args 24: 0x78e6f5387f5c - rustc_sanitizers[9a055dd07b406515]::cfi::typeid::itanium_cxx_abi::encode::encode_ty 25: 0x78e6f538dcf7 - rustc_sanitizers[9a055dd07b406515]::cfi::typeid::itanium_cxx_abi::typeid_for_fnabi 26: 0x78e6f538e546 - rustc_sanitizers[9a055dd07b406515]::cfi::typeid::itanium_cxx_abi::typeid_for_instance 27: 0x78e6f5386b2c - rustc_sanitizers[9a055dd07b406515]::kcfi::typeid::typeid_for_instance 28: 0x78e6f330dd15 - ::predefine_fn 29: 0x78e6f6b2f861 - rustc_codegen_llvm[90f7dfbc3b8799f7]::base::compile_codegen_unit::module_codegen 30: 0x78e6f6b2bbbc - ::compile_codegen_unit 31: 0x78e6f6df87c1 - rustc_codegen_ssa[60af8791d0b2af86]::base::codegen_crate:: 32: 0x78e6f6c437ce - ::codegen_crate 33: 0x78e6f6c4315f - rustc_interface[b48fbfbbfca56691]::passes::start_codegen 34: 0x78e6f6c427da - ::codegen_and_build_linker 35: 0x78e6f6a7cd32 - rustc_interface[b48fbfbbfca56691]::interface::run_compiler::, rustc_driver_impl[4e6b8414dae3c1cf]::run_compiler::{closure#0}>::{closure#1} 36: 0x78e6f6a43a89 - std[3073bd340ab08955]::sys_common::backtrace::__rust_begin_short_backtrace::, rustc_driver_impl[4e6b8414dae3c1cf]::run_compiler::{closure#0}>::{closure#1}, core[be135d473bf2241c]::result::Result<(), rustc_span[fa5d72863ffc22f0]::ErrorGuaranteed>>::{closure#0}, core[be135d473bf2241c]::result::Result<(), rustc_span[fa5d72863ffc22f0]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[be135d473bf2241c]::result::Result<(), rustc_span[fa5d72863ffc22f0]::ErrorGuaranteed>> 37: 0x78e6f6a43836 - <::spawn_unchecked_, rustc_driver_impl[4e6b8414dae3c1cf]::run_compiler::{closure#0}>::{closure#1}, core[be135d473bf2241c]::result::Result<(), rustc_span[fa5d72863ffc22f0]::ErrorGuaranteed>>::{closure#0}, core[be135d473bf2241c]::result::Result<(), rustc_span[fa5d72863ffc22f0]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[be135d473bf2241c]::result::Result<(), rustc_span[fa5d72863ffc22f0]::ErrorGuaranteed>>::{closure#2} as core[be135d473bf2241c]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0} 38: 0x78e6f81b2e4b - as core::ops::function::FnOnce>::call_once::h19ba87d856808e00 at /rustc/7bb0ef4902e43f338aa73c3ff728bea3cb9ecf6a/library/alloc/src/boxed.rs:2063:9 39: 0x78e6f81b2e4b - as core::ops::function::FnOnce>::call_once::hc37c884ba84dd5ac at /rustc/7bb0ef4902e43f338aa73c3ff728bea3cb9ecf6a/library/alloc/src/boxed.rs:2063:9 40: 0x78e6f81b2e4b - std::sys::pal::unix::thread::Thread::new::thread_start::h713e9186dc9dedf7 at /rustc/7bb0ef4902e43f338aa73c3ff728bea3cb9ecf6a/library/std/src/sys/pal/unix/thread.rs:108:17 41: 0x78e6f16a6ded - 42: 0x78e6f172a0dc - 43: 0x0 - 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 1.81.0-nightly (7bb0ef490 2024-06-09) running on x86_64-unknown-linux-gnu note: compiler flags: -Z sanitizer=kcfi -C panic=abort -Z dump-mir-dir=dir query stack during panic: end of query stack error: aborting due to 1 previous error; 2 warnings emitted ```

@rustbot label +F-generic_const_exprs +F-generic_arg_infer

rust-lang / rust

ICE: kcfi: encode_const: unexpected kind `UnevaluatedConst { .. }` #126203