{"ast_node_type":"other","tokens":[{"end":34,"kind":"keyword","start":0,"text":"//"}]}
        // `'a: 'b` ==> `'b <= 'a`
    pub(super) fn register_region_outlives(&self, a: I::Region, b: I::Region) {
        self.delegate.sub_regions(b, a, self.origin_span);