structs containing borrowed pointers

lifetimes.rs

struct Parent {                                    
    data: uint,
}

struct Child<'self> {
    parent: &'self Parent,
}

impl<'self> Parent {
    fn new() ⟶  Parent {
        return Parent{ data: 0 };
    }

    fn spawn_child(&'self self) ⟶  &'self Child {
        return &Child{ parent: self };
    }
}

fn main() {
    let parent = Parent::new();
    let child = parent.spawn_child();
}

output.txt

lifetimes.rs:15:31: 15:37 error: cannot infer an appropriate lifetime due to conflicting requirements
lifetimes.rs:15         return &Child{ parent: self };
                                               ^~~~~~
lifetimes.rs:14:48: 16:5 note: first, the lifetime cannot outlive the lifetime &'self  as defined on the block at 14:48...
lifetimes.rs:14     fn spawn_child(&'self self) -> &'self Child {
lifetimes.rs:15         return &Child{ parent: self };
lifetimes.rs:16     }
lifetimes.rs:15:31: 15:37 note: ...due to the following expression
lifetimes.rs:15         return &Child{ parent: self };
                                               ^~~~~~
lifetimes.rs:14:48: 16:5 note: but, the lifetime must be valid for the anonymous lifetime #1 defined on the block at 14:48...
lifetimes.rs:14     fn spawn_child(&'self self) -> &'self Child {
lifetimes.rs:15         return &Child{ parent: self };
lifetimes.rs:16     }
lifetimes.rs:15:15: 15:21 note: ...due to the following expression
lifetimes.rs:15         return &Child{ parent: self };
                               ^~~~~~
error: aborting due to previous error