Cleaning up in scala.runtime.*. Removing unused methods.

Fixed toArray to copy more than one element into the new one.
Added sameElements to Iterator to further simplify the case
class support logic, and because it should be there anyway.

git-svn-id: http://lampsvn.epfl.ch/svn-repos/scala/scala/trunk@19872 5e8d7ff9-d8ef-0310-90f0-a4852d11357a

src/compiler/scala/tools/nsc/symtab/StdNames.scala

@@ -280,7 +280,6 @@ trait StdNames {
     val eq = newTermName("eq")
     val equals_ = newTermName("equals")
     val _equals = newTermName("_equals")
-    val _equalsWithVarArgs = newTermName("_equalsWithVarArgs")
     val inlinedEquals = newTermName("inlinedEquals")
     val error = newTermName("error")
     val ex = newTermName("ex")

src/library/scala/collection/Iterator.scala

@@ -14,7 +14,6 @@ package scala.collection
 import mutable.{Buffer, ArrayBuffer, ListBuffer, StringBuilder}
 import immutable.{List, Stream}
 import annotation.{ tailrec }
-// import immutable.{List, Nil, ::, Stream}
 
 /** The <code>Iterator</code> object provides various functions for
  *  creating specialized iterators.
@@ -1031,6 +1030,20 @@ trait Iterator[+A] { self =>
     buffer 
   }
   
+  /** Checks if the other iterator contains the same elements as this one.
+   *
+   *  @note will not terminate for infinite-sized iterators.
+   *  @param that  the other iterator
+   *  @return true, iff both iterators contain the same elements in the same order.
+   */
+  def sameElements(that: Iterator[_]): Boolean = {    
+    while (hasNext && that.hasNext)
+      if (next != that.next)
+        return false
+    
+    !hasNext && !that.hasNext
+  }
+  
   /** Returns a string representation of the elements in this iterator. The resulting string
    *  begins with the string <code>start</code> and is finished by the string
    *  <code>end</code>. Inside, the string representations of elements (w.r.t.

src/library/scala/runtime/ScalaRunTime.scala

@@ -14,7 +14,7 @@ package scala.runtime
 import scala.reflect.ClassManifest
 import scala.collection.Seq
 import scala.collection.mutable._
-import scala.collection.immutable.{List, Stream, Nil, ::}
+import scala.collection.immutable.{ List, Stream, Nil, :: }
 
 /* The object <code>ScalaRunTime</code> provides ...
  */
@@ -52,7 +52,10 @@ object ScalaRunTime {
   def toArray[T](xs: scala.collection.Seq[T]) = {
     val arr = new Array[AnyRef](xs.length)
     var i = 0
-    for (x <- xs) arr(i) = x.asInstanceOf[AnyRef]
+    for (x <- xs) {
+      arr(i) = x.asInstanceOf[AnyRef]
+      i += 1
+    }
     arr
   }
 
@@ -87,16 +90,8 @@ object ScalaRunTime {
         throw exception
   }
 
-  def caseFields(x: Product): List[Any] = {
-    val arity = x.productArity
-    def fields(from: Int): List[Any] =
-      if (from == arity) List()
-      else x.productElement(from) :: fields(from + 1)
-    fields(0)
-  }
-
   def _toString(x: Product): String =
-    caseFields(x).mkString(x.productPrefix + "(", ",", ")")
+    x.productIterator.mkString(x.productPrefix + "(", ",", ")")
 
   def _hashCodeJenkins(x: Product): Int =
     scala.util.JenkinsHash.hashSeq(x.productPrefix.toSeq ++ x.productIterator.toSeq)
@@ -122,36 +117,10 @@ object ScalaRunTime {
     else x.equals(y)
 
   def _equals(x: Product, y: Any): Boolean = y match {
-    case y1: Product if x.productArity == y1.productArity =>
-      val arity = x.productArity
-      var i = 0
-      while (i < arity && x.productElement(i) == y1.productElement(i))
-        i += 1
-      i == arity
-    case _ =>
-      false
+    case y: Product if x.productArity == y.productArity => x.productIterator sameElements y.productIterator
+    case _                                              => false
   }
 
-  def _equalsWithVarArgs(x: Product, y: Any): Boolean = y match {
-    case y1: Product if x.productArity == y1.productArity =>
-      val arity = x.productArity
-      var i = 0
-      while (i < arity - 1 && x.productElement(i) == y1.productElement(i))
-        i += 1
-      i == arity - 1 && {
-        x.productElement(i) match {
-          case xs: Seq[_] =>
-            y1.productElement(i) match {
-              case ys: Seq[_] => xs sameElements ys
-            }
-        }
-      }
-    case _ =>
-      false
-  }
-
-  def Seq[a](xs: a*): Seq[a] = null // interpreted specially by new backend.
-
   /** Given any Scala value, convert it to a String.
    *
    * The primary motivation for this method is to provide a means for