{"ast_node_type":"variable","tokens":[{"end":51,"kind":"keyword","start":0,"text":"let"}]}
        let var_ty = self.resolve(var_ty, &l.span);
        let var_ty = self.fcx.local_ty(l.span, l.hir_id);
        self.write_ty_to_typeck_results(l.hir_id, var_ty);