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Bad MIR when casting a reference to dyn* #102430
Labels
C-bug
Category: This is a bug.
F-dyn_star
`#![feature(dyn_star)]`
I-ICE
Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️
requires-nightly
This issue requires a nightly compiler in some way.
T-compiler
Relevant to the compiler team, which will review and decide on the PR/issue.
Comments
@rustbot label +C-bug +T-compiler +I-ICE +F-dyn_star +requires-nightly |
rustbot
added
C-bug
Category: This is a bug.
F-dyn_star
`#![feature(dyn_star)]`
I-ICE
Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️
requires-nightly
This issue requires a nightly compiler in some way.
T-compiler
Relevant to the compiler team, which will review and decide on the PR/issue.
labels
Sep 29, 2022
A smaller sample that ICE's with the same message: #![feature(dyn_star)]
#![allow(incomplete_features)]
use std::fmt::Display;
fn bug() -> impl Display {
// This reference seems to be evil.
// `1 as dyn* Display` compiles fine!
&1 as dyn* Display
}
fn main() {
let _ = bug();
} |
The sample provided by DutchGhost compiles now, and the one that @eholk provided compiles with some slight modification (adding some #![feature(dyn_star)]
#![allow(incomplete_features)]
trait AddOne {
fn add1(&mut self) -> usize;
}
impl AddOne for usize {
fn add1(&mut self) -> usize {
*self += 1;
*self
}
}
impl AddOne for &mut usize {
fn add1(&mut self) -> usize {
(*self).add1()
}
}
fn add_one(mut i: dyn* AddOne + '_) -> usize {
i.add1()
}
fn main() {
let mut x = 42usize;
let y = &mut x as (dyn* AddOne + '_);
println!("{}", add_one(y));
} |
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Labels
C-bug
Category: This is a bug.
F-dyn_star
`#![feature(dyn_star)]`
I-ICE
Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️
requires-nightly
This issue requires a nightly compiler in some way.
T-compiler
Relevant to the compiler team, which will review and decide on the PR/issue.
Test case (playground:
This gives the following error message:
The text was updated successfully, but these errors were encountered: