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diff --git a/src/dotnet-library/scala/collection/immutable/Map1.scala b/src/dotnet-library/scala/collection/immutable/Map1.scala
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+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2007, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |                                         **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+
+// $Id: ListMap.scala 9554 2007-01-04 16:30:16 +0000 (Thu, 04 Jan 2007) odersky $
+
+
+
+package scala.collection.immutable
+
+/** This class implements empty immutable maps
+ *  @author  Martin Oderskty
+ *  @version 1.0, 019/01/2007
+ */
+[serializable]
+class Map1[A, +B](key1: A, value1: B) extends Map[A, B] {
+
+  def size = 1
+
+  def get(key: A): Option[B] =
+    if (key == key1) Some(value1) else None
+
+  def elements = Iterator.single({key1, value1})
+
+  def empty[B]: Map[A, B] = new EmptyMap[A, B]
+
+  def update [B1 >: B](key: A, value: B1): Map[A, B1] =
+    if (key == key1) new Map1(key1, value)
+    else new Map2(key1, value1, key, value)
+
+  def - (key: A): Map[A, B] =
+    if (key == key1) empty else this
+}
+
+
+