CacheWarmer parse class as from use Enum as B

[miroslavhajek]

Q	A
Bug report?	yes
Feature request?	no
BC Break report?	no
RFC?	no

Steps required to reproduce the problem

1. Create custom class extends some Enum class
2. ConsistenceEnum is defined with alias - important line is \Enum as ConsistenceEnum
3. Method JMS\SerializerBundle\Cache::findClasses make as public
4. Run test...

There is some problem in regex parts...

This has been copied from https://github.com/composer/composer/blob/bfed974ae969635e622c4844e5e69526d8459baf/src/Composer/Autoload/ClassMapGenerator.php#L120-L214

<?php

namespace Jms;

use Consistence\Enum\Enum as ConsistenceEnum;

class MyEnum extends ConsistenceEnum
{

}

Expected Result

<?php

declare(strict_types = 1);

namespace Jms;

use JMS\SerializerBundle\Cache\CacheWarmer;
use PHPUnit\Framework\TestCase;

class CacheWarmerTest extends TestCase
{

    public function testFindClasses(): void
    {
        $classes = CacheWarmer::findClasses(__DIR__ . '/MyEnum.php');

        self::assertSame(['Jms\MyEnum'], $classes);
    }

}

Actual Result

<?php

declare(strict_types = 1);

namespace Jms;

use JMS\SerializerBundle\Cache\CacheWarmer;
use PHPUnit\Framework\TestCase;

class CacheWarmerTest extends TestCase
{

    public function testFindClasses(): void
    {
        $classes = CacheWarmer::findClasses(__DIR__ . '/MyEnum.php');

        self::assertSame(['Jms\as', 'Jms\MyEnum'], $classes);
    }

}