Merge pull request #1018 from dotty-staging/fix/paramless-override

VCArrayPrototype: replace override "def clone" by "def clone()"

Author: DarkDimius

src/dotty/runtime/vc/VCPrototype.scala

@@ -10,7 +10,7 @@ abstract class VCArrayPrototype[T <: VCPrototype] extends Object with Cloneable
   def apply(idx: Int): Object
   def update(idx: Int, el: T): Unit
   def length: Int
-  override def clone: Object = super.clone()
+  override def clone(): Object = super.clone()
 }