Function resolve_effects 

pub fn resolve_effects<S: EffectSystem>(
    system: &S,
    state: &mut S::State,
    initial: impl IntoIterator<Item = S::Effect>,
) -> usize

Resolves initial and everything it triggers, applying each effect then enqueuing its follow-ups, in FIFO order.

Returns the number of effects resolved. Stops at MAX_EFFECTS to bound a non-terminating trigger loop (a game bug).