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Почему возникает ошибка «Call to a member function concurrency() on array»?

Я пробую запустить следующий код:

https://gist.github.com/fgilio/7bc0d5dce3f1b3670f2...

Мои действия:

PendingConcurrentPool:
<?php

namespace App\Http\Controllers;

use Closure;
use GuzzleHttp\Client;
use GuzzleHttp\Exception\RequestException;
use GuzzleHttp\Pool;
use GuzzleHttp\Psr7\Response;
use Illuminate\Support\Collection;

class PendingConcurrentPool extends Controller
{
    private Closure $requestsBuilder;
    private int $concurrency = 10;

    public function __construct(Closure $requestsBuilder)
    {
        $this->requestsBuilder = $requestsBuilder;
    }

    public function concurrency(int $amount): self
    {
        $this->concurrency = $amount;
        return $this;
    }

    public function wait(): Collection
    {
        $responses = collect();

        $pool = new Pool(new Client(), call_user_func($this->requestsBuilder), [
            'concurrency' => $this->concurrency,
            'fulfilled' => function (Response $response, $index) use ($responses) {
                $responses[$index] = new \Illuminate\Http\Client\Response($response);
            },
            'rejected' => function (RequestException $reason, $index) use ($responses) {
                $responses[$index] = new \Illuminate\Http\Client\Response($reason->getResponse());
            },
        ]);

        $pool->promise()->wait();

        return $responses;
    }
}

testSendsConcurrentRequests:
<?php

namespace App\Http\Controllers;

use Illuminate\Support\Facades\Http;

class HttpClientController extends Controller
{
    public function testSendsConcurrentRequests()
    {
        $responses = Http::pool(function () {
            return yield from [
                'req-1' => new \GuzzleHttp\Psr7\Request('GET', 'http://localhost:8000/test/req-1'),
                'req-2' => new \GuzzleHttp\Psr7\Request('GET', 'http://localhost:8001/test/req-2'),
                'req-3' => new \GuzzleHttp\Psr7\Request('GET', 'http://localhost:8002/test/req-3'),
                'req-4' => new \GuzzleHttp\Psr7\Request('GET', 'http://localhost:8003/test/req-4'),
            ];
        })->concurrency(4)->wait();

        dump($responses->map->json());
    }
}

PendingRequest:
<?php

namespace App\Providers;

use Closure;
use App\Http\Controllers\PendingConcurrentPool;
use Illuminate\Http\Client\PendingRequest;
use Illuminate\Support\ServiceProvider;

class MacroServiceProvider extends ServiceProvider
{
    public function register()
    {
        PendingRequest::macro('pool', function (Closure $requestsBuilder) {
            return new PendingConcurrentPool($requestsBuilder);
        });
    }
}

Провайдера зарегистрировал в:

config app -> 'providers' => [

App\Providers\MacroServiceProvider::class,

При переходе на страницу получаю ошибку:

Call to a member function concurrency() on array

})->concurrency(4)->wait();

В чем ошибка?
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