src/Pure/General/scan.scala

 import scala.collection.{IndexedSeq, TraversableOnce}
 import scala.collection.immutable.PagedSeq
 import scala.util.parsing.input.{OffsetPosition, Position => InputPosition, Reader}
 import scala.util.parsing.combinator.RegexParsers
 
-import java.io.{File, InputStream, BufferedInputStream, FileInputStream}
+import java.io.{File, BufferedInputStream, FileInputStream}
 
 
 object Scan
 {
   /** context of partial scans **/