File: issue-88236.rs

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// this used to cause stack overflows

trait Hrtb<'a> {
    type Assoc;
}

impl<'a> Hrtb<'a> for () {
    type Assoc = ();
}

impl<'a> Hrtb<'a> for &'a () {
    type Assoc = ();
}

fn make_impl() -> impl for<'a> Hrtb<'a, Assoc = impl Send + 'a> {}
//~^ ERROR higher kinded lifetime bounds on nested opaque types are not supported yet

fn main() {}