File: issue-90014.rs

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rustc 1.88.0%2Bdfsg1-1
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//@ edition:2018

#![feature(impl_trait_in_assoc_type)]

use std::future::Future;

trait MakeFut {
    type Fut<'a>
    where
        Self: 'a;
    fn make_fut<'a>(&'a self) -> Self::Fut<'a>;
}

impl MakeFut for &'_ mut () {
    type Fut<'a> = impl Future<Output = ()>;
    //~^ ERROR: the type `&mut ()` does not fulfill the required lifetime

    fn make_fut<'a>(&'a self) -> Self::Fut<'a> {
        async { () }
    }
}

fn main() {}