1.

Author: odersky

src/library/scala/xml/MetaData.scala

@@ -116,7 +116,7 @@ abstract class MetaData extends Iterable[MetaData] {
   def equals1(that: MetaData): Boolean
 
   /** filters this sequence of meta data */
-  def filter(f: MetaData => Boolean): MetaData = {
+  override def filter(f: MetaData => Boolean): MetaData = {
     if (f(this)) copy(next filter f) else next filter f
   }
 

src/library/scala/xml/NodeSeq.scala

@@ -161,7 +161,7 @@ abstract class NodeSeq extends Seq[Node] {
     y
   }
 
-  def filter(f: Node => Boolean): NodeSeq = {
+  override def filter(f: Node => Boolean): NodeSeq = {
     val x = toList filter f
     x
   }

src/library/scala/xml/Null.scala

@@ -24,7 +24,7 @@ case object Null extends MetaData {
   /** returns its argument */
   def copy(next: MetaData) = next
 
-  override def elements = Iterator.empty[MetaData]
+  override def elements = Iterator.empty
 
   override def filter(f: MetaData => Boolean): MetaData = this
 

test/files/jvm/xml01.scala

@@ -177,7 +177,7 @@ object Test {
         //Text("John Mitchell"),
         Elem(null,"title",e,sc,Text("Foundations of Programming Languages"))
         //Text("Foundations of Programming Languages")
-      )
+      ): Seq[Node]
   );
 
     // test group node