id: kotlin-prefer-data-class
valid:
  - |
    data class Point(val x: Int, val y: Int)
  - |
    open class Base(val x: Int)
  - |
    class Mixed(val x: Int, y: Int)
  - |
    class WithBehavior(val x: Int) {
        fun scale(factor: Int): Int = x * factor
    }
  - |
    class WithInit(val x: Int) {
        init { println(x) }
    }
  - |
    class WithComputed(val x: Int) {
        val doubled: Int get() = x * 2
    }
invalid:
  - |
    class Point(val x: Int, val y: Int)
  - |
    class Ok(val v: String) : Result()