{"ast_node_type":"variable","tokens":[{"end":71,"kind":"keyword","start":0,"text":"let"}]}
            let previous_defs = self.defs.last_set_in(block_start..=p);
            let block_start = self.cx.location_map.to_block_start(p);
            let previous_live_at = self.use_live_at.last_set_in(block_start..=p);