public void METHOD_1 ( TYPE_1 VAR_1 ) { <BUG> this . VAR_2 . add ( VAR_1 ) ;</BUG> this . update ( ) ; }
public void METHOD_1 ( TYPE_1 VAR_1 ) { if ( this . VAR_2 . add ( VAR_1 ) ) { this . update ( ) ; } } 
