Bug report

PHPStan triggers an internal error when importing PackageVersions\Versions.

This happens since PHPStan 0.12.89.

Code snippet that reproduces the problem

The website won't let me share it because it errors but this example is enough to trigger it:

<?php

use PackageVersions\Versions;

PHP Fatal error: Cannot declare class _HumbugBox15516bb2b566\Composer\InstalledVersions, because the name is already in use in phar:///app/vendor/phpstan/phpstan/phpstan.phar/vendor/composer/InstalledVersions.php on line 23

Expected output

No error

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