Bug report

I noticed that a test had started failing in phpstan-drupal where we check a variable named $callable that we use a stub to mark as callable-string. It broke with 2.1.38: mglaman/phpstan-drupal#938. I believe this was broken with phpstan/phpstan-src#4829

Our stub:

    /**
     * @param callable-string $callback
     * @param array<int|string, mixed> $args
     */
    public function createPlaceholder($callback, array $args): string {

    }

The real code

   * @param string $callback
   *   The #lazy_builder callback that will replace the placeholder with its
   *   eventual markup.
   * @param array $args
   *   The arguments for the #lazy_builder callback.
   *
   * @return string
   *   The placeholder markup.
   */
  public function createPlaceholder($callback, array $args) {

Code snippet that reproduces the problem

https://phpstan.org/r/3caeb8f6-befd-42b7-a80b-5cc56057ed69

Expected output

I don't know how to test a stub file with the playground, so this passes.

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