{"ast_node_type":"variable","tokens":[{"end":63,"kind":"keyword","start":0,"text":"let"}]}
                let expected_ty = expected.only_has_type(self);
                    hir_ty.map(|hir_ty| self.lower_ty_saving_user_provided_ty(hir_ty));
                let binder_ty = match (ascribed_ty, expected_ty) {