fixed #176 (CLDC build)

1 files changed, 30 insertions, 12 deletions

diff --git a/src/dotnet-library/scala/List.scala b/src/dotnet-library/scala/List.scala
index e50d8e9bc5..4f5693dc4f 100644
--- a/src/dotnet-library/scala/List.scala
+++ b/src/dotnet-library/scala/List.scala
@@ -401,7 +401,6 @@ sealed abstract class List[+A] extends Seq[A] {
    */
   def head: A
 
-
   /** returns length - l, without calling length
    */
   override def lengthCompare(l: Int) = {
@@ -457,9 +456,14 @@ sealed abstract class List[+A] extends Seq[A] {
    *  @param prefix the prefix to reverse and then prepend
    *  @return       the concatenation of the reversed prefix and the current list.
    */
-  def reverse_:::[B >: A](prefix: List[B]): List[B] = prefix match {
-    case Nil => this
-    case head :: tail => (head :: this).reverse_:::(tail)
+  def reverse_:::[B >: A](prefix: List[B]): List[B] = {
+    var these: List[B] = this
+    var pres = prefix
+    while (!pres.isEmpty) {
+      these = pres.head :: these
+      pres = pres.tail
+    }
+    these
   }
 
   /** Returns the number of elements in the list.
@@ -541,8 +545,15 @@ sealed abstract class List[+A] extends Seq[A] {
    */
   override def last: A =
     if (isEmpty) throw new Predef.NoSuchElementException("Nil.last")
-    else if (tail.isEmpty) head
-    else tail.last
+    else {
+      var cur = this
+      var next = this.tail
+      while (!next.isEmpty) {
+        cur = next
+        next = next.tail
+      }
+      cur.head
+    }
 
   /** Returns the <code>n</code> first elements of this list, or else the whole
    *  list, if it has less than <code>n</code> elements.
@@ -581,9 +592,15 @@ sealed abstract class List[+A] extends Seq[A] {
    *  @param n the number of elements to drop.
    *  @return the list without its <code>n</code> first elements.
    */
-  override def drop(n: Int): List[A] =
-    if (isEmpty || n <= 0) this
-    else (tail drop (n-1))
+  override def drop(n: Int): List[A] = {
+    var these = this
+    var count = n
+    while (!these.isEmpty && count > 0) {
+      these = these.tail
+      count -= 1
+    }
+    these
+  }
 
   /** Returns the rightmost <code>n</code> elements from this list.
    *
@@ -1219,8 +1236,9 @@ case object Nil extends List[Nothing] {
  *  @version 1.0, 15/07/2003
  */
 @SerialVersionUID(0L - 8476791151983527571L)
-final case class ::[B](hd: B, private[scala] var tl: List[B]) extends List[B] {
-  def head = hd
-  def tail = tl
+final case class ::[B](private var hd: B, private[scala] var tl: List[B]) extends List[B] {
+  def head : B = hd
+  def tail : List[B] = tl
   override def isEmpty: Boolean = false
 }
+