Fix #3442: Make wait, notify and notifyAll final

Author: allanrenucci

compiler/src/dotty/tools/dotc/core/Definitions.scala

@@ -277,11 +277,11 @@ class Definitions {
         pt => MethodType(List(pt.paramRefs(0)), pt.paramRefs(0)), Final)
     lazy val Object_clone = enterMethod(ObjectClass, nme.clone_, MethodType(Nil, ObjectType), Protected)
     lazy val Object_finalize = enterMethod(ObjectClass, nme.finalize_, MethodType(Nil, UnitType), Protected)
-    lazy val Object_notify = enterMethod(ObjectClass, nme.notify_, MethodType(Nil, UnitType))
-    lazy val Object_notifyAll = enterMethod(ObjectClass, nme.notifyAll_, MethodType(Nil, UnitType))
-    lazy val Object_wait = enterMethod(ObjectClass, nme.wait_, MethodType(Nil, UnitType))
-    lazy val Object_waitL = enterMethod(ObjectClass, nme.wait_, MethodType(LongType :: Nil, UnitType))
-    lazy val Object_waitLI = enterMethod(ObjectClass, nme.wait_, MethodType(LongType :: IntType :: Nil, UnitType))
+    lazy val Object_notify = enterMethod(ObjectClass, nme.notify_, MethodType(Nil, UnitType), Final)
+    lazy val Object_notifyAll = enterMethod(ObjectClass, nme.notifyAll_, MethodType(Nil, UnitType), Final)
+    lazy val Object_wait = enterMethod(ObjectClass, nme.wait_, MethodType(Nil, UnitType), Final)
+    lazy val Object_waitL = enterMethod(ObjectClass, nme.wait_, MethodType(LongType :: Nil, UnitType), Final)
+    lazy val Object_waitLI = enterMethod(ObjectClass, nme.wait_, MethodType(LongType :: IntType :: Nil, UnitType), Final)
 
     def ObjectMethods = List(Object_eq, Object_ne, Object_synchronized, Object_clone,
         Object_finalize, Object_notify, Object_notifyAll, Object_wait, Object_waitL, Object_waitLI)

tests/neg/i3442.scala

@@ -0,0 +1,18 @@
+class Test {
+  // Any
+  override def getClass(): Class[_] = ??? // error
+  override def ==(that: Any): Boolean = ??? // error
+  override def != (that: Any): Boolean = ??? // error
+  override def ##(): Int = ??? // error
+  override def isInstanceOf[T0]: Boolean = ??? // error
+  override def asInstanceOf[T0]: T0 = ??? // error
+
+  // AnyRef
+  override def eq(that: AnyRef): Boolean = ??? // error
+  override def ne(that: AnyRef): Boolean = ??? // error
+  override def notify(): Unit = ??? // error
+  override def notifyAll(): Unit = ??? // error
+  override def wait(): Unit = ??? // error
+  override def wait(timeout: Long, nanos: Int): Unit = ??? // error
+  override def wait(timeout: Long): Unit = ??? // error
+}