pub fn diff_class_def2<'a, 'b>(
def1: &'a Vec<ClassDefItem>,
def2: &'b Vec<ClassDefItem>,
) -> Vec<(&'a ClassDefItem, &'b ClassDefItem)>pub fn diff_class_def2<'a, 'b>(
def1: &'a Vec<ClassDefItem>,
def2: &'b Vec<ClassDefItem>,
) -> Vec<(&'a ClassDefItem, &'b ClassDefItem)>