{"ast_node_type":"variable","tokens":[{"end":87,"kind":"keyword","start":0,"text":"let"}]}
        let t_expr = self.check_expr_with_expectation(e, ExpectCastableToType(t_cast));
        let t_cast = self.resolve_vars_if_possible(t_cast);
        let t_expr = self.resolve_vars_if_possible(t_expr);