//@ compile-flags:-Zverbose-internals

#![allow(warnings)]

trait Anything { }

impl<T> Anything for T { }

fn no_region<'a, T>(mut x: T) -> Box<dyn Anything + 'a>
where
    T: Iterator,
{
    Box::new(x.next())
    //~^ ERROR the associated type `<T as Iterator>::Item` may not live long enough
}

fn correct_region<'a, T>(mut x: T) -> Box<dyn Anything + 'a>
where
    T: 'a + Iterator,
{
    Box::new(x.next())
}

fn wrong_region<'a, 'b, T>(mut x: T) -> Box<dyn Anything + 'a>
where
    T: 'b + Iterator,
{
    Box::new(x.next())
    //~^ ERROR the associated type `<T as Iterator>::Item` may not live long enough
}

fn outlives_region<'a, 'b, T>(mut x: T) -> Box<dyn Anything + 'a>
where
    T: 'b + Iterator,
    'b: 'a,
{
    Box::new(x.next())
}

fn main() {}