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#![feature(impl_trait_in_assoc_type)]
// edition:2021
use std::future::Future;
trait Foo {
type T;
type Fut2: Future<Output = Self::T>; // ICE got triggered with traits other than Future here
type Fut: Future<Output = Self::Fut2>;
fn get_fut(&self) -> Self::Fut;
}
struct Implementor;
impl Foo for Implementor {
type T = u64;
type Fut2 = impl Future<Output = u64>;
type Fut = impl Future<Output = Self::Fut2>;
fn get_fut(&self) -> Self::Fut {
//~^ ERROR `{integer}` is not a future
async move {
42
// 42 does not impl Future and rustc does actually point out the error,
// but rustc used to panic.
// Putting a valid Future here always worked fine.
}
}
}
fn main() {}
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