2 files changed, 29 insertions, 9 deletions
diff --git a/src/library/scala/collection/SetLike.scala b/src/library/scala/collection/SetLike.scala
index 31465bb619..f8ac1d754d 100644
--- a/src/library/scala/collection/SetLike.scala
+++ b/src/library/scala/collection/SetLike.scala
@@ -107,22 +107,36 @@ self =>
    */
   def + (elem: A): This
 
-  /** Creates a new $coll with additional elements.
+  /** Creates a new $coll with additional elements, omitting duplicates.
    *
-   *  This method takes two or more elements to be added. Another overloaded
-   *  variant of this method handles the case where a single element is added.
+   *  This method takes two or more elements to be added. Elements that already exist in the $coll will
+   *  not be added. Another overloaded variant of this method handles the case where a single element is added.
+   *
+   *  Example:
+   *   {{{
+   *    scala> val a = Set(1, 3) + 2 + 3
+   *    a: scala.collection.immutable.Set[Int] = Set(1, 3, 2)
+   *   }}}
    *
    *  @param elem1 the first element to add.
    *  @param elem2 the second element to add.
    *  @param elems the remaining elements to add.
-   *  @return   a new $coll with the given elements added.
+   *  @return   a new $coll with the given elements added, omitting duplicates.
    */
   def + (elem1: A, elem2: A, elems: A*): This = this + elem1 + elem2 ++ elems
 
-  /** Creates a new $coll by adding all elements contained in another collection to this $coll.
+  /** Creates a new $coll by adding all elements contained in another collection to this $coll, omitting duplicates.
+   *
+   * This method takes a collection of elements and adds all elements, omitting duplicates, into $coll.
+   *
+   * Example:
+   *  {{{
+   *    scala> val a = Set(1, 2) ++ Set(2, "a")
+   *    a: scala.collection.immutable.Set[Any] = Set(1, 2, a)
+   *  }}}
    *
-   *  @param elems     the collection containing the added elements.
-   *  @return a new $coll with the given elements added.
+   *  @param elems     the collection containing the elements to add.
+   *  @return a new $coll with the given elements added, omitting duplicates.
    */
   def ++ (elems: GenTraversableOnce[A]): This = (repr /: elems.seq)(_ + _)
 
diff --git a/src/library/scala/util/Random.scala b/src/library/scala/util/Random.scala
index 8d68c5be38..2d38c9d4a0 100644
--- a/src/library/scala/util/Random.scala
+++ b/src/library/scala/util/Random.scala
@@ -121,15 +121,21 @@ class Random(val self: java.util.Random) extends AnyRef with Serializable {
     (bf(xs) ++= buf).result()
   }
 
+  @deprecated("Preserved for backwards binary compatibility. To remove in 2.12.x.", "2.11.6")
+  final def `scala$util$Random$$isAlphaNum$1`(c: Char) = (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') || (c >= '0' && c <= '9')
+
   /** Returns a Stream of pseudorandomly chosen alphanumeric characters,
    *  equally chosen from A-Z, a-z, and 0-9.
    *
    *  @since 2.8
    */
   def alphanumeric: Stream[Char] = {
-    def isAlphaNum(c: Char) = (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') || (c >= '0' && c <= '9')
+    def nextAlphaNum: Char = {
+      val chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
+      chars charAt (self nextInt chars.length)
+    }
 
-    Stream continually nextPrintableChar filter isAlphaNum
+    Stream continually nextAlphaNum
   }
 
 }