File: issue-23595-1.rs

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#![feature(associated_type_defaults)]

use std::ops::Index;

trait Hierarchy {
    type Value;
    type ChildKey;
    type Children = dyn Index<Self::ChildKey, Output=dyn Hierarchy>;
    //~^ ERROR: the value of the associated types

    fn data(&self) -> Option<(Self::Value, Self::Children)>;
}

fn main() {}