Issue #2135845 by Wim Leers: UserInterface duplicates some methods of AccountInterface.

core/modules/user/lib/Drupal/user/UserInterface.php

@@ -15,14 +15,6 @@
  */
 interface UserInterface extends ContentEntityInterface, AccountInterface {
 
-  /**
-   * Returns a list of roles.
-   *
-   * @return array
-   *   List of role IDs.
-   */
-  public function getRoles();
-
   /**
    * Whether a user has a certain role.
    *
@@ -50,17 +42,6 @@ public function addRole($rid);
    */
   public function removeRole($rid);
 
-  /**
-   * Checks whether a user has a certain permission.
-   *
-   * @param string $permission
-   *   The permission string to check.
-   *
-   * @return bool
-   *   TRUE if the user has the permission, FALSE otherwise.
-   */
-  public function hasPermission($permission);
-
   /**
    * Sets the username of this account.
    *