gistfile1.md

so you want to have a Tank, and then you have different sub-tanks which have different AIs, yeah? and all the AIs need their own state

pub struct Tank<A> {
    pub pos: f32
    pub health: u32,
    pub ai: A
}
impl<A: TankAi> Tank<A> {
    fn think(&mut self) { <A as TankAi>::think(self) }
}

pub trait TankAi {
    fn think(&mut Tank<Self>);
}