{"ast_node_type":"variable","tokens":[{"end":81,"kind":"keyword","start":0,"text":"let"}]}
                let res = self.cx.typeck_results().qpath_res(qpath, expr.hir_id);
            hir::ExprKind::Path(ref qpath) => {
                self.cat_res(expr.hir_id, expr.span, expr_ty, res)