path: root/test/files/neg/switch.scala

import scala.annotation.switch

// this is testing not so much how things ought to be but how they are;
// the test is supposed to start failing if the behavior changes at all.
object Other {
  val C1 = 'P'                // fails: not final
  final val C2 = 'Q'          // succeeds: singleton type Char('Q') inferred
  final val C3: Char = 'R'    // fails: type Char specified
  final val C4 = '\u000A'     // succeeds like C2 but more unicodey
}

object Main {
  def succ1(c: Char) = (c: @switch) match {
    case 'A' | 'B' | 'C'  => true
    case 'd'              => true
    case 'f' | 'g'        => true
    case _                => false
  }

  def succ2(c: Char) = (c: @switch) match {
    case 'A' | 'B' | 'C'  => true
    case Other.C2         => true
    case Other.C4         => true
    case _                => false
  }

  // has a guard, but since SI-5830 that's ok
  def succ_guard(c: Char) = (c: @switch) match {
    case 'A' | 'B' | 'C'  => true
    case x if x == 'A'    => true
    case _                => false
  }

  // throwing in @unchecked on the next two to make sure
  // multiple annotations are processed correctly

  // thinks a val in an object is constant... so naive
  def fail2(c: Char) = (c: @switch @unchecked) match {
    case 'A'        => true
    case Other.C1   => true
    case _          => false
  }

  // more naivete
  def fail3(c: Char) = (c: @unchecked @switch) match {
    case 'A'        => true
    case Other.C3   => true
    case _          => false
  }

  // guard case done correctly
  def succ3(c: Char) = (c: @switch) match {
    case 'A' | 'B' | 'C'  => true
    case x                => x == 'A'
  }

  // some ints just to mix it up a bit
  def succ4(x: Int, y: Int) = ((x+y): @switch) match {
    case  1 => 5
    case  2 => 10
    case  3 => 20
    case  4 => 50
    case 5|6|7|8 => 100
    case _  => -1
  }
}