fun Int.foo() : Boolean = true

fun foo() : Int {
    val s = ""
    val x = 1
    when (x) {
      is <error>String</error> -> 1
      !is Int -> 1
      is Any? -> 1
      <error>s</error> -> 1
      1 -> 1
      1 + <error>a</error> -> 1
      in 1..<error>a</error> -> 1
      !in 1..<error>a</error> -> 1
      // Commented for KT-621 .<!error>a</!error> -> 1
      // Commented for KT-621 .equals(1).<!error>a</!error> -> 1
      // Commented for KT-621 <!warning>?.</!warning>equals(1) -> 1
      is * -> 1
    }

    // Commented for KT-621
    // return when (<!warning>x</!warning>?:null) {
    //   <!error>.</!error>foo() -> 1
    //   ?.equals(1).equals(2) -> 1
    // }
    return 0
}

val _type_test : Int = foo() // this is needed to ensure the inferred return type of foo()

fun test() {
  val x = 1;
  val s = "";

  when (x) {
    <error>s</error> -> 1
    is <error>""</error> -> 1
    x -> 1
    is 1 -> 1
    is <error>#(1, 1)</error> -> 1
    else -> 1
  }

  val z = #(1, 1)

  when (z) {
    is #(*, *) -> 1
    is #(*, 1) -> 1
    is #(1, 1) -> 1
    is #(1, <error>"1"</error>) -> 1
    is <error>#(1, "1", *)</error> -> 1
    is boo #(1, <error>"a"</error>, *) -> 1
    is boo <error>#(1, *)</error> -> 1
    else -> 1
  }

  when (z) {
    <error>else</error> -> 1
    <error>#(1, 1) -> 2</error>
  }

  when (z) {
    else -> 1
  }
}

val #(Int, Int).boo : #(Int, Int, Int) = #(1, 1, 1)