use Async;
use Await;
use Concurrently;

use function async;
use function await;
use function concurrently;

class Async {}
class Await {}
class Concurrently {}

// async, await, and concurrently operations.
function async(): void {
    $a = async bar();
    $b = await $a;
    ($c, $d) = concurrently {
        await baz(),
        await qux(),
    };
}

// async, await, and concurrently function calls.
function await(): void {
    $a = async(bar());
    $b = await($a);
    ($c, $d) = concurrently(
        await(baz()),
        await(qux()),
    );
}

// async, await, and concurrently function calls with generic type parameters.
function concurrently(): void {
    $a = async::<int>(bar());
    $b = await::<int>($a);
    ($c, $d) = concurrently::<int>(
        await::<int>(baz()),
        await::<int>(qux()),
    );
}

// async, await, and concurrently static method calls.
function _(): void {
    Async::async();
    Await::await(Async::async());
    Concurrently::concurrently(
        Await::await(),
        Await::await(),
    );
}

// async, await, and concurrently method calls.
function _(): void {
    $async->async();
    $await->await($async->async());
    $concurrently->concurrently(
        $await->await(),
        $await->await(),
    );
}