Minimal example to reproduce issue

static_lifetime_issue.rs

trait Task {}
trait Display {}

struct SomethingTask<'d> {
    displays: Vec<&'d Display>,
}
impl<'d> Task for SomethingTask<'d> {}

struct MyDisplay;
impl Display for MyDisplay {}

struct Engine {
    tasks: Vec<Box<Task>>,
}

fn main() {
    let my_display = MyDisplay;
    let displays = vec![&my_display as &Display];
    //                   ^^^^^^^^^^ does not live long enough

    let task: Box<Task> = Box::new(SomethingTask { displays: displays });
    let tasks = vec![task];

    Engine { tasks: tasks };
}
// - borrowed value only lives until here
// = note: borrowed value must be valid for the static lifetime...