{"ast_node_type":"other","tokens":[{"end":84,"kind":"keyword","start":0,"text":"self.free_region_constraint_info(borrow_region_vid,"}]}
                        self.free_region_constraint_info(borrow_region_vid, region);
                    let (category, from_closure, span, region_name, path) =
                    if let Some(region_name) = region_name {