review comments

use direct vals where no casting is required

Author: mkeskells

library/src/scala/collection/immutable/BitSet.scala

@@ -81,8 +81,7 @@ object BitSet extends BitSetFactory[BitSet] {
   }
 
   /** $bitsetCanBuildFrom */
-  implicit def canBuildFrom: CanBuildFrom[BitSet, Int, BitSet] = ReusableCBF
-  private[this] val ReusableCBF = bitsetCanBuildFrom
+  implicit val canBuildFrom: CanBuildFrom[BitSet, Int, BitSet] = bitsetCanBuildFrom
 
   /** A bitset containing all the bits in an array */
   def fromBitMask(elems: Array[Long]): BitSet = {

library/src/scala/collection/immutable/WrappedString.scala

@@ -56,9 +56,7 @@ final class WrappedString(val self: String) extends AbstractSeq[Char] with Index
  *  @since 2.8
  */
 object WrappedString {
-  implicit def canBuildFrom: CanBuildFrom[WrappedString, Char, WrappedString] =
-    ReusableCBF.asInstanceOf[CanBuildFrom[WrappedString, Char, WrappedString]]
-  private[this] val ReusableCBF = new CanBuildFrom[WrappedString, Char, WrappedString] {
+  implicit val canBuildFrom: CanBuildFrom[WrappedString, Char, WrappedString] = new CanBuildFrom[WrappedString, Char, WrappedString] {
     def apply(from: WrappedString) = newBuilder
     def apply() = newBuilder
   }

library/src/scala/collection/mutable/BitSet.scala

@@ -193,8 +193,7 @@ object BitSet extends BitSetFactory[BitSet] {
   def newBuilder: Builder[Int, BitSet] = new GrowingBuilder[Int, BitSet](empty)
 
   /** $bitsetCanBuildFrom */
-  implicit def canBuildFrom: CanBuildFrom[BitSet, Int, BitSet] = ReusableCBF
-  private[this] val ReusableCBF = bitsetCanBuildFrom
+  implicit val canBuildFrom: CanBuildFrom[BitSet, Int, BitSet] = bitsetCanBuildFrom
 
   /** A bitset containing all the bits in an array */
   def fromBitMask(elems: Array[Long]): BitSet = {