error: internal compiler error: broken MIR in DefId #105821
Labels
A-const-generics
Area: const generics (parameters and arguments)
C-bug
Category: This is a bug.
E-needs-test
Call for participation: An issue has been fixed and does not reproduce, but no test has been added.
F-adt_const_params
`#![feature(adt_const_params)]`
F-generic_const_exprs
`#![feature(generic_const_exprs)]`
glacier
ICE tracked in rust-lang/glacier.
I-ICE
Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️
T-compiler
Relevant to the compiler team, which will review and decide on the PR/issue.
Comments
AuroransSolis
added
C-bug
BoxyUwU
added
A-const-generics
|
I got another instance of this here: (sorry for the large producer) terrarier2111/Miri-weirdness@705ced8 And this is the error: |
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Shorter variant that avoids #![allow(incomplete_features)]
#![feature(adt_const_params, const_ptr_read, generic_const_exprs)]
#![allow(dead_code)]
const fn catone<const M: usize>(_a: &[u8; M]) -> [u8; M + 1]
where
[(); M + 1]:,
{
unimplemented!()
}
struct Catter<const A: &'static [u8]>;
impl<const A: &'static [u8]> Catter<A>
where
[(); A.len() + 1]:,
{
const ZEROS: &'static [u8; A.len()] = &[0_u8; A.len()];
const R: &'static [u8] = &catone(Self::ZEROS);
}
fn main() {}Regression in nightly-2021-12-06. In earlier versions, the compiler reported "error: overly complex generic constant". Commits in range |
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Just to clarify, the issue is almost certainly just in |
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Update: the issue is somewhere in the use of #![allow(incomplete_features)]
#![feature(adt_const_params, generic_const_exprs)]
const fn str_to_arr<const FOO: &'static str>() -> [u8; FOO.len()] {
let mut out = [0; FOO.len()];
let bytes = FOO.as_bytes();
let mut i = 0;
while i < bytes.len() {
out[i] = bytes[i];
i += 1;
}
out
}
const fn concat_strs<const A: &'static str, const B: &'static str>() -> &'static str
where
[(); A.len()]:,
[(); B.len()]:,
[(); A.len() + B.len()]:,
{
struct Inner<const A: &'static str, const B: &'static str>;
impl<const A: &'static str, const B: &'static str> Inner<A, B>
where
[(); A.len()]:,
[(); B.len()]:,
[(); A.len() + B.len()]:,
{
const ARRA: [u8; A.len()] = str_to_arr::<A>();
const ARRB: [u8; B.len()] = str_to_arr::<B>();
const ARRJOIN: [u8; A.len() + B.len()] = {
let mut out = [0; A.len() + B.len()];
let mut i = 0;
while i < A.len() {
out[i] = Self::ARRA[i];
i += 1;
}
while i - A.len() < B.len() {
out[i] = Self::ARRB[i - A.len()];
i += 1;
}
out
};
const STRJOIN: &str = unsafe { std::str::from_utf8_unchecked(&Self::ARRJOIN) };
}
Inner::<A, B>::STRJOIN
}
const TESTL: &str = "Hello, ";
const TESTR: &str = "world!";
const TESTJOIN: &str = concat_strs::<TESTL, TESTR>();
fn main() {
println!("'{TESTL}'");
println!("'{TESTR}'");
println!("'{TESTJOIN}'");
}This was as part of trying to confirm the issue was not in #[repr(C)]
struct ConcatJoin<const M: usize, const N: usize> {
left: [u8; M],
right: [u8; N],
}
#[repr(C)]
union ConcatJoiner<const M: usize, const N: usize>
where
[(); M + N]:,
{
whole: ManuallyDrop<[u8; M + N]>,
split: ManuallyDrop<ConcatJoin<M, N>>,
}
const fn concat_arrs<const M: usize, const N: usize>(a: [u8; M], b: [u8; N]) -> [u8; M + N]
where
[(); M + N]:,
{
unsafe {
let joiner = ConcatJoiner {
split: ManuallyDrop::new(ConcatJoin { left: a, right: b }),
};
let join = joiner.whole;
ManuallyDrop::into_inner(join)
}
}and then const ARRA: [u8; A.len()] = str_to_arr::<A>();
const ARRB: [u8; B.len()] = str_to_arr::<B>();
const ARRJOIN: [u8; A.len() + B.len()] = concat_arrs(Self::ARRA, Self::ARRB);
const STRJOIN: &str = unsafe { std::str::from_utf8_unchecked(&Self::ARRJOIN) };I get the exact same issue as in what was initially reported. |
|
No longer ICEs since #107434 |
Alexendoo
added
the
E-needs-test
JohnTitor
added a commit
to JohnTitor/rust
that referenced
this issue
Mar 1, 2023
Signed-off-by: Yuki Okushi <jtitor@2k36.org>
bors
added a commit
to rust-lang-ci/rust
that referenced
this issue
Mar 1, 2023
Rollup of 7 pull requests Successful merges: - rust-lang#108143 (rustdoc: search by macro when query ends with `!`) - rust-lang#108394 (Make `x doc --open` work on every book) - rust-lang#108427 (Recover from for-else and while-else) - rust-lang#108462 (Fix `VecDeque::append` capacity overflow for ZSTs) - rust-lang#108568 (Make associated_item_def_ids for traits use an unstable option to also return associated types for RPITITs) - rust-lang#108604 (Add regression test for rust-lang#107280) - rust-lang#108605 (Add regression test for rust-lang#105821) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup
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I'm back. This time I tried concatenating non-literal
&'static strs.Code
Why? Excellent question, next please.
Meta
rustc --version --verbose:Error output
Backtrace
RUST_BACKTRACE=1:RUST_BACKTRACE=fullThe text was updated successfully, but these errors were encountered: