Implemented RichString as Seq[Char] and Ordered...

Implemented RichString as Seq[Char] and Ordered[String] and removed the
superfluous implicit conversions from Predef

Author: mihaylov

src/library/scala/xml/ProcInstr.scala

@@ -30,7 +30,7 @@ case class ProcInstr(target:String, proctext:String) extends SpecialNode {
 
   final override def typeTag$:Int = -2;
 
-  val z:Seq[Char] = Predef.string2seq(target); z match {
+  (target: Seq[Char]) match {
     case Seq('X'|'x','M'|'m','L'|'l') =>
       throw new IllegalArgumentException(target+" is reserved");
     case _ =>

src/library/scala/xml/Utility.scala

@@ -295,8 +295,7 @@ object Utility extends AnyRef with parsing.TokenTests {
    */
   def appendEscapedQuoted(s: String, sb: StringBuilder) = {
     sb.append('"')
-    val z:Seq[Char] = Predef.string2seq(s)
-    for (val c <- z) c match {
+    for (val c <- s) c match {
       case '"' => sb.append('\\'); sb.append('"')
       case _   => sb.append(c)
     }

src/library/scala/xml/parsing/TokenTests.scala

@@ -72,8 +72,7 @@ trait TokenTests {
    */
   def isName(s: String): Boolean = {
     if( s.length() > 0 ) {
-      val z:Seq[Char] = Predef.string2seq(s);
-      val y           = z.elements;
+      val y           = s.elements;
       if (isNameStart(y.next)) {
         while (y.hasNext && isNameChar(y.next)) {};
         !y.hasNext
@@ -132,8 +131,7 @@ trait TokenTests {
   def checkPubID(s: String): Boolean = {
     //Console.println("checkPubID of \""+s+"\"");
     if (s.length() > 0) {
-      val z: Seq[Char] = Predef.string2seq(s);
-      val y = z.elements;
+      val y = s.elements;
       var c = ' ';
       while (y.hasNext && isPubIDChar(c)) {
         //Console.println(c);