public < TYPE_1 extends TYPE_2 > TYPE_1 METHOD_1 ( TYPE_1 VAR_1 ) { VAR_2 . METHOD_2 ( VAR_1 ) ; <BUG> return null ;</BUG> }
public < TYPE_1 extends TYPE_2 > TYPE_1 METHOD_1 ( TYPE_1 VAR_1 ) { VAR_2 . METHOD_2 ( VAR_1 ) ; return VAR_1 ; } 
