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/* Test checked initializers. Needs to be run with -Xexperimental and -checkinit
*/
// 0 inherited fields
class A {
val x = 1
val y = 2
var z = 3
}
// 3 inherited fields
class B extends A {
val b1 = 1
var b2 = 2
}
trait T {
val t1 = 1
var t2 = 2
}
// Should not throw
class D extends B with T {
val sum = x + y + z + b1 + b2 + t1 + t2
override def toString =
"sum = " + sum
}
abstract class NeedsXEarly {
val x: Int
val y = x + 1
}
// should pass
class GoodX extends { val x = 1 } with NeedsXEarly {
}
// should throw
class BadX extends NeedsXEarly {
val x = 1
println(y)
}
// should pass
class UglyX extends NeedsXEarly {
lazy val x = 1
println(y)
}
trait XY {
val x = 1
val y = 2
}
// needs x and y early
trait LazyFields {
lazy val lz1 = 1
lazy val lz2 = 2
val x: Int
val y: Int
val needsSomeEarly = {
println("x = " + x)
println("y = " + y)
println("lz1 = " + lz1)
println("lz2 = " + lz2)
x + y + lz1 + lz2
}
}
// will fail at init
class BadMixin extends LazyFields with XY {
println("[OK]: " + needsSomeEarly)
}
// should print 24
class GoodMixin extends {
override val x = 10
override val y = 11
} with LazyFields with XY {
println("[OK]: " + needsSomeEarly)
}
class TestInterference extends {
override val x = 10
override val y = 11
} with A with T with LazyFields {
println("[OK]: " + needsSomeEarly)
}
object Test extends App {
def shouldThrow(t: => Unit) = try {
t
println("[FAIL]: No UFE thrown")
} catch {
case UninitializedFieldError(msg) =>
println("[OK] Caught UFE: " + msg)
}
val d = new D()
println(d)
shouldThrow(new BadX)
(new GoodX)
(new UglyX)
shouldThrow(new BadMixin)
(new GoodMixin)
(new TestInterference)
}
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