Prefer scala.Serializable to j.io.Serializable

The former extends the latter, and exists as a platorm agnostic
serialization marker trait. It is of less value now that we
have jettisoned the MSIL backend, but while it still exists
we ought ought to use it.

I achieved this by replacing wildcard import of `java.io._`
with selective imports, leaving `Serializable` to bind to
`scala.Serializable`.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/library/scala/collection/mutable/ListBuffer.scala b/src/library/scala/collection/mutable/ListBuffer.scala
index 5e838d0d88..d6a4d92139 100644
--- a/src/library/scala/collection/mutable/ListBuffer.scala
+++ b/src/library/scala/collection/mutable/ListBuffer.scala
@@ -12,7 +12,7 @@ package mutable
 
 import generic._
 import immutable.{List, Nil, ::}
-import java.io._
+import java.io.{ObjectOutputStream, ObjectInputStream}
 import scala.annotation.migration
 
 /** A `Buffer` implementation back up by a list. It provides constant time