{"ast_node_type":"variable","tokens":[{"end":65,"kind":"keyword","start":0,"text":"let"}]}
                    let upvar_hir_id = upvar.get_root_variable();
                    let upvar = &self.upvars[upvar_field.index()];
                    use_span = match self.infcx.tcx.parent_hir_node(upvar_hir_id) {