path: root/tests/neg/overrides.scala

  abstract class FooA {
    type A <: Ax;
    abstract class Ax;
    abstract class InnerA {
      type B <: A;
      def doB : B;
    }
  }
  trait FooB extends FooA {
    type A <: Ax;
    trait Ax extends super.Ax { def xxx : Int; }
    abstract class InnerB extends InnerA {
      // type B <: A;
      val a : A = doB;
      a.xxx;
      doB.xxx;
    }
  }

package p1 {
  abstract class T1 {
    protected def bug(p: Int = 1): Int // without 'protected' compiles fine
  }
}
package p2 { // all being in the same package compiles fine
  import p1._
  abstract class T2 extends T1 {
    class A {
      bug()
    }
  }

  abstract class T3 extends T2 {
    class A {
      bug()
    }
  }
}

class A[T] {

  def f(x: T)(y: T = x) = y

}

class B extends A[Int] {

  def f(x: Int)(y: Int) = y

  f(2)()

}

class X {
  def f: A[Int] = ???
}
class Y extends X {
  def f: A[Int] = ???
}


class A1
class B1

class X1 {
  def f(): A1 = ???
}
class Y1 extends X1 {
  override def f(): B1 = ???
}

class X2 {
  type T = A1
}
class Y2 extends X2 {
  type T = B1
}

class X3 {
  override type T = A1
}

package p3 {

// Dotty change of rules: Toverrider#f does not
// override TCommon#f, hence the accidental override rule
// applies.
trait TCommon {
  def f: String
}

class C1 extends TCommon {
  def f = "in C1"
}

trait TOverrider { this: TCommon =>
  override def f = "in TOverrider"   // The overridden self-type member...
}

class C2 extends C1 with TOverrider  // ... fails to override, here.

}

package p4 {

  abstract class C[T] { def head: T }
  case class D[T](head: Int) extends C[T]

}

package p5 {
class A {
  def m: String = "foo"
}

class B extends A {
  override val m: Int = 42
}

class C extends A {
  override def m: Int = 42
}
}