ICE: cannot convert '{erased} to a region vid
#125564
Labels
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)]`
I-ICE
Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️
requires-incomplete-features
T-compiler
Relevant to the compiler team, which will review and decide on the PR/issue.
Comments
matthiaskrgr
added
I-ICE
rustbot
added
needs-triage
#![allow(incomplete_features)]
#![feature(adt_const_params, 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() {} |
fmease
changed the title
cannot convert '{erased}` to a region vid'{erased} to a region vid
fmease
changed the title
'{erased} to a region vid'{erased} to a region vid
saethlin
removed
the
needs-triage
8 tasks
|
Is this ICE still reproducible now? I cannot reproduce it on my local machine. Version info: rustc 1.83.0-nightly (363ae4188 2024-09-24)
binary: rustc
commit-hash: 363ae4188316b8b22cf6c1890bc73d84d05f70a4
commit-date: 2024-09-24
host: x86_64-unknown-linux-gnu
release: 1.83.0-nightly
LLVM version: 19.1.0Test case: #![allow(incomplete_features)]
#![feature(unsized_const_params, generic_const_exprs)]
const fn concat_strs() -> &'static str {
const fn concat_arr<const M: usize, const N: usize>(a: [u8; M], b: [u8; N]) -> [u8; M + N] {}
impl<const A: &'static str, const B: &'static str> Inner<A, B>
where
[(); A.len()]:,
[(); B.len()]:,
[(); A.len() + B.len()]:,
{
const ABSTR: &'static str = unsafe {
std::str::from_utf8_unchecked(&concat_arr(
A.as_ptr().cast().read(),
B.as_ptr().cast().read(),
))
};
}
}
fn main() {}Command: rustc +nightly ice-125564.rs -Zincremental-verify-ich=yes -Cincremental=dir -Cdebuginfo=2Program Outputerror[E0412]: cannot find type `Inner` in this scope
--> ice-125564.rs:7:56
|
7 | impl<const A: &'static str, const B: &'static str> Inner<A, B>
| ^^^^^ not found in this scope
error[E0308]: mismatched types
--> ice-125564.rs:4:27
|
4 | const fn concat_strs() -> &'static str {
| ----------- ^^^^^^^^^^^^ expected `&str`, found `()`
| |
| implicitly returns `()` as its body has no tail or `return` expression
error[E0308]: mismatched types
--> ice-125564.rs:5:84
|
5 | const fn concat_arr<const M: usize, const N: usize>(a: [u8; M], b: [u8; N]) -> [u8; M + N] {}
| ---------- ^^^^^^^^^^^ expected `[u8; M + N]`, found `()`
| |
| implicitly returns `()` as its body has no tail or `return` expression
|
note: consider returning one of these bindings
--> ice-125564.rs:5:57
|
5 | const fn concat_arr<const M: usize, const N: usize>(a: [u8; M], b: [u8; N]) -> [u8; M + N] {}
| ^ ^
warning: type annotations needed
--> ice-125564.rs:15:35
|
15 | A.as_ptr().cast().read(),
| ^^^^
|
= warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
= note: for more information, see issue #46906 <https://github.com/rust-lang/rust/issues/46906>
= note: `#[warn(tyvar_behind_raw_pointer)]` on by default
warning: type annotations needed
--> ice-125564.rs:16:35
|
16 | B.as_ptr().cast().read(),
| ^^^^
|
= warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
= note: for more information, see issue #46906 <https://github.com/rust-lang/rust/issues/46906>
error: aborting due to 3 previous errors; 2 warnings emitted
Some errors have detailed explanations: E0308, E0412.
For more information about an error, try `rustc --explain E0308`. |
|
Running @Jaic1 's code above, I also got the same exact output. Details
error[E0412]: cannot find type `Inner` in this scope
--> test.rs:7:56
|
7 | impl<const A: &'static str, const B: &'static str> Inner<A, B>
| ^^^^^ not found in this scope
error[E0308]: mismatched types
--> test.rs:4:27
|
4 | const fn concat_strs() -> &'static str {
| ----------- ^^^^^^^^^^^^ expected `&str`, found `()`
| |
| implicitly returns `()` as its body has no tail or `return` expression
error[E0308]: mismatched types
--> test.rs:5:84
|
5 | const fn concat_arr<const M: usize, const N: usize>(a: [u8; M], b: [u8; N]) -> [u8; M + N] {}
| ---------- ^^^^^^^^^^^ expected `[u8; M + N]`, found `()`
| |
| implicitly returns `()` as its body has no tail or `return` expression
|
note: consider returning one of these bindings
--> test.rs:5:57
|
5 | const fn concat_arr<const M: usize, const N: usize>(a: [u8; M], b: [u8; N]) -> [u8; M + N] {}
| ^ ^
warning: type annotations needed
--> test.rs:15:35
|
15 | A.as_ptr().cast().read(),
| ^^^^
|
= warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
= note: for more information, see issue #46906 <https://github.com/rust-lang/rust/issues/46906>
= note: `#[warn(tyvar_behind_raw_pointer)]` on by default
warning: type annotations needed
--> test.rs:16:35
|
16 | B.as_ptr().cast().read(),
| ^^^^
|
= warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
= note: for more information, see issue #46906 <https://github.com/rust-lang/rust/issues/46906>
error: aborting due to 3 previous errors; 2 warnings emitted
Some errors have detailed explanations: E0308, E0412.
For more information about an error, try `rustc --explain E0308`. |
|
maybe cc @matthiaskrgr |
|
seems to be fixed indeed 👍 |
matthiaskrgr
added
the
E-needs-test
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auto-reduced (treereduce-rust):
original:
Version information
Command:
/home/matthias/.rustup/toolchains/master/bin/rustc -Zincremental-verify-ich=yes -Cincremental=<dir> -Cdebuginfo=2Program output
@rustbot label +F-adt_const_params +F-generic_const_exprs
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