Backslash removed from FQCN in tests

[szepeviktor]

Bug report

I'm sorry, I cannot write code in phpstan.org/try

phpstan-wordress tests do not pass with latest PHPStan:

--- Expected

+++ Actual

@@ @@

-'\WP_List_Table|false'

+'WP_List_Table|false'

from https://app.travis-ci.com/github/szepeviktor/phpstan-wordpress/jobs/584859030

extension: https://github.com/szepeviktor/phpstan-wordpress/blob/d44b5abcaa529698e138b2d21bc2a7cf9834039c/src/GetListTableDynamicFunctionReturnTypeExtension.php#L40-L47
test code: https://github.com/szepeviktor/phpstan-wordpress/blob/e644df734e1bbe95810e0f617d17df091048a94e/tests/data/_get_list_table.php#L13-L14
function definition in WordPress (no namespace):

     * @param string $class_name The type of the list table, which is the class name.
     * @param array  $args       Optional. Arguments to pass to the class. Accepts 'screen'.
     * @return WP_List_Table|false List table object on success, false if the class does not exist.
     */
    function _get_list_table($class_name, $args = array()

Please help. I'm not able to debug PHPStan.
Thank you.

[mergeable]

This bug report is missing a link to reproduction at phpstan.org/try.

It will most likely be closed after manual review.

[ondrejmirtes]

Likely an expected side effect of this change phpstan/phpstan-src#1758

[szepeviktor]

Thank you.

[github-actions]

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