data class Student(val id: Int, val name: String)

fun Arb.Companion.student(
    id: Arb<Int> = positiveInt(),
    name: Arb<String> = string()
): Arb<Student> = arbitrary { rs ->
    Student(
        id.next(rs),
        name.next(rs) // or name.bind() and ignore rs?
    )
}

bind

next

Arb.bind(id, name, ::Student)

Arb.student().next(myRandomSource)

fun Arb.Companion.student(
    id: Arb<Int> = positiveInt(),
    name: Arb<String> = string()
): Arb<Student> = arbitrary { 
    Student(
        id.bind(),
        name.bind()
    )
}

Arb.bind(id, name, ::Student)

arbitrary { }