ICE: cannot relate region: LUB(ReErased, ReErased) #102510
Labels
C-bug
Category: This is a bug.
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
QuentinPerez
added
C-bug
|
Minimized it a little #![feature(type_alias_impl_trait)]
use std::future::Future;
type X<T> = Box<dyn Future<Output = T>>;
trait Service {
type Something;
fn stream<'a, 'b>(&self) -> X<Self::Something>
where
'a: 'b;
}
impl Service for () {
type Something = impl Sized;
fn stream<'a, 'b>(&self) -> X<Self::Something>
where
'a: 'b,
{
Box::new(async move { std::iter::from_fn(|| Some(())) })
}
}
fn main() {} |
|
searched nightlies: from nightly-2022-01-01 to nightly-2022-09-30 bisected with cargo-bisect-rustc v0.6.4Host triple: x86_64-unknown-linux-gnu cargo bisect-rustc --access github --timeout 30 --start 2022-01-01 |
|
cc #98559 |
|
cc @jackh726 |
|
I get the same ICE when using the current nightly in a complex Codebase. |
|
I think I minimized this to: #![feature(type_alias_impl_trait)]
struct Output;
trait Service {
type OutputStream;
fn stream<'l, 'a>(&'l self) -> Self::OutputStream
where
Self: 'a,
'l: 'a;
}
trait Stream {
type Item;
}
struct ImplStream<F: Fn()>(F);
impl<F: Fn()> Stream for ImplStream<F> {
type Item = Output;
}
impl Service for () {
type OutputStream = impl Stream<Item = Output>;
fn stream<'l, 'a>(&'l self) -> Self::OutputStream
where
Self: 'a,
'l: 'a,
{
ImplStream(|| ())
}
}
fn main() {} |
matthiaskrgr
added a commit
to matthiaskrgr/rust
that referenced
this issue
Oct 13, 2022
…li-obk replace ReErased with fresh region vars in opaque types See inline comments. Prior art rust-lang#102943. cc `@compiler-errors` `@oli-obk` Fixes rust-lang#100267 Fixes rust-lang#101940 Fixes rust-lang#102649 Fixes rust-lang#102510
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👋 Since the nightly 2022-09-11, the following code doesn't compile anymore.
Code
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rustc --version --verbose:Error output
Backtrace
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