public void add ( TYPE_1 VAR_1 ) throws TYPE_2 { assert VAR_1 != null ; <BUG> if ( contains ( VAR_1 ) ) {throw new TYPE_2 ( ) ;}</BUG> VAR_2 . add ( VAR_1 ) ; }
public void add ( TYPE_1 VAR_1 ) throws TYPE_2 { assert VAR_1 != null ; VAR_2 . add ( VAR_1 ) ; } 
