{"ast_node_type":"import","tokens":[{"end":89,"kind":"keyword","start":0,"text":"//"}]}
            // Query `def_span` is not used because hashing its result span is expensive.
            Some(def_id) => self.tcx.source_span(def_id),
            None => self.cstore().def_span_untracked(def_id, self.tcx.sess),