insert_before_link
  
  Description:
  [ 
Version ( since = 
"2.62" ) ]
public void insert_before_link (
List<
G> sibling, 
owned List<
G> link_)
  
    Inserts link_ into this before sibling.
    sibling must be part of this.
    Parameters:
    
      
        | this | a Queue | 
      
        | sibling | a List link that must be part of this, or 
            null to  push at the tail of the queue. | 
      
        | link_ | a List link to insert which must not be part of any other list. |