iyes_loopless 0.9.1

Composable alternatives to Bevy's States/FixedTimestep/RunCriteria
Documentation 
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use bevy::prelude::*;
use iyes_loopless::prelude::*;

fn main() {
    App::new()
        .add_plugins(DefaultPlugins)
        .add_system(exclusive.run_if(cond))
        .run();
}

fn cond(_t: Res<Time>) -> bool {
    false
}

fn exclusive(_world: &mut World) {
    println!("ooo");
}