3 files changed, 23 insertions, 10 deletions
diff --git a/src/library/scala/Enumeration.scala b/src/library/scala/Enumeration.scala
index e11d1b35d7..c4aa511cd7 100644
--- a/src/library/scala/Enumeration.scala
+++ b/src/library/scala/Enumeration.scala
@@ -121,7 +121,8 @@ abstract class Enumeration (initial: Int) extends Serializable {
    * @throws   NoSuchElementException if no `Value` with a matching
    *           name is in this `Enumeration`
    */
-  final def withName(s: String): Value = values.find(_.toString == s).get
+  final def withName(s: String): Value = values.find(_.toString == s).getOrElse(
+    throw new NoSuchElementException(s"No value found for '$s'"))
 
   /** Creates a fresh value, part of this enumeration. */
   protected final def Value: Value = Value(nextId)
diff --git a/src/library/scala/collection/mutable/ArrayBuffer.scala b/src/library/scala/collection/mutable/ArrayBuffer.scala
index 8f77114746..011fd415ee 100644
--- a/src/library/scala/collection/mutable/ArrayBuffer.scala
+++ b/src/library/scala/collection/mutable/ArrayBuffer.scala
@@ -128,7 +128,7 @@ class ArrayBuffer[A](override protected val initialSize: Int)
   override def ++=:(xs: TraversableOnce[A]): this.type = { insertAll(0, xs.toTraversable); this }
 
   /** Inserts new elements at the index `n`. Opposed to method
-   *  `update`, this method will not replace an element with a
+   *  `update`, this method will not replace an element with a new
    *  one. Instead, it will insert a new element at index `n`.
    *
    *  @param n     the index where a new element will be inserted.
@@ -137,12 +137,13 @@ class ArrayBuffer[A](override protected val initialSize: Int)
    */
   def insertAll(n: Int, seq: Traversable[A]) {
     if (n < 0 || n > size0) throw new IndexOutOfBoundsException(n.toString)
-    val xs = seq.toList
-    val len = xs.length
-    ensureSize(size0 + len)
+    val len = seq.size
+    val newSize = size0 + len
+    ensureSize(newSize)
+
     copy(n, n + len, size0 - n)
-    xs.copyToArray(array.asInstanceOf[scala.Array[Any]], n)
-    size0 += len
+    seq.copyToArray(array.asInstanceOf[Array[Any]], n)
+    size0 = newSize
   }
 
   /** Removes the element on a given index position. It takes time linear in
diff --git a/src/library/scala/io/Source.scala b/src/library/scala/io/Source.scala
index 74c3e06839..9f0b56b4fe 100644
--- a/src/library/scala/io/Source.scala
+++ b/src/library/scala/io/Source.scala
@@ -169,9 +169,20 @@ object Source {
     createBufferedSource(is, reset = () => fromInputStream(is)(codec), close = () => is.close())(codec)
 }
 
-/** The class `Source` implements an iterable representation of source data.
- *  Calling method `reset` returns an identical, resetted source, where
- *  possible.
+/** An iterable representation of source data.
+ *  It may be reset with the optional `reset` method.
+ *
+ *  Subclasses must supply [[scala.io.Source@iter the underlying iterator]].
+ *
+ *  Error handling may be customized by overriding the [[scala.io.Source@report report]] method.
+ *
+ *  The [[scala.io.Source@ch current input]] and [[scala.io.Source@pos position]],
+ *  as well as the [[scala.io.Source@next next character]] methods delegate to
+ *  [[scala.io.Source$Positioner the positioner]].
+ *
+ *  The default positioner encodes line and column numbers in the position passed to `report`.
+ *  This behavior can be changed by supplying a
+ *  [[scala.io.Source@withPositioning(pos:Source.this.Positioner):Source.this.type custom positioner]].
  *
  *  @author  Burak Emir
  *  @version 1.0