Whether this link is accessible by the current user.
If the value is NULL the access was not determined yet, if an access result object, it was determined already.
Type: \Drupal\Core\Access\AccessResultInterface|NULL
public $access;
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Menu!MenuLinkTreeElement.php/property/MenuLinkTreeElement::access/8.1.x