Fix -migration warning.

Author: olafurpg

compilation/src/main/dotc/scala/tools/benchmark/BenchmarkDriver.scala

@@ -12,6 +12,7 @@ trait BenchmarkDriver extends BaseBenchmarkDriver {
       ctx.setSetting(ctx.settings.classpath,
                      depsClasspath.mkString(File.pathSeparator))
     }
+    ctx.setSetting(ctx.settings.migration, true)
     ctx.setSetting(ctx.settings.d, tempDir.getAbsolutePath)
     ctx.setSetting(ctx.settings.language, List("Scala2"))
     val compiler = new dotty.tools.dotc.Compiler

corpus/vector/fb04376/Vector.scala

@@ -82,7 +82,7 @@ override def companion: GenericCompanion[Vector] = Vector
 
   override def lengthCompare(len: Int): Int = length - len
 
-  private[collection] final def initIterator[B >: A](s: VectorIterator[B]) {
+  private[collection] final def initIterator[B >: A](s: VectorIterator[B]): Unit = {
     s.initFrom(this)
     if (dirty) s.stabilize(focus)
     if (s.depth > 1) s.gotoPos(startIndex, startIndex ^ focus)