code: public function hasTag(string $tag) : bool
      {
          return null !== Psi::it($this->annotations)
                  ->filter(new IsInstanceOf(Tag::class))
                  ->filter(function (Tag $t) use ($tag) {
                      return $t->filter($tag);
                  })
                  ->getFirst();
      }
docs: @param string $tag
  
  @return bool