All they have to do is to expand generics to support generic methods so we can have monadic operations like in C++'s std::expected or Rust's Result, like

    func (r Result[T, E]) AndThen[OtherT any](func(T) Result[OtherT, E]) Result[OtherT, E] { ... }

which would enable error handling like

    sum := 0
    parseAndAdd := func(s string) (func(string)Result[int, error]) { /* returns func which parses and adds to sum */ }
    return parseAndAdd(a)().AndThen(parseAndAdd(b))

There's a reason why every other language is converging to that sort of functional setup, as it opens up possibilities such as try-transform generics for ranges.