IMO a groups of constraints are horrible with interfaces

type CommonResponse(type E) interface {
    GetError() E
}

type CommonError interface {
    GetCode() int32
}

func IsOK(type R CommonResponse(E), E CommonError)(r R) bool {
    switch r.GetError().GetCode() {
    case 0, 200, 201:
        return true
    default:
    return false
    }
}

vs

constract CommmonResponse(R, E) {
    R GetError() E
    E GetCode() int32
}

func IsOK(type R, E CommonResponse)(r R) bool {
    switch r.GetError().GetCode() {
    case 0, 200, 201:
        return true
    default:
    return false
    }
}

That trickery with commas to express dependcy of types is hard

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