Merge pull request #4888 from dotty-staging/fix-scripted

 Fix scripted/source-dependencies/restore-classes

Author: allanrenucci

sbt-dotty/sbt-test/source-dependencies/restore-classes/pending renamed to sbt-dotty/sbt-test/source-dependencies/restore-classes/test

@@ -26,11 +26,12 @@ final class TastyFileManager extends ClassFileManager {
   private[this] val movedTastyFiles = new mutable.HashMap[File, File]
 
   override def delete(classes: Array[File]): Unit = {
-    val toBeBackedUp = tastyFiles(classes)
+    val tasties = tastyFiles(classes)
+    val toBeBackedUp = tasties
       .filter(t => t.exists && !movedTastyFiles.contains(t) && !generatedTastyFiles(t))
     for (c <- toBeBackedUp)
       movedTastyFiles.put(c, move(c))
-    IO.deleteFilesEmptyDirs(classes)
+    IO.deleteFilesEmptyDirs(tasties)
   }
 
   override def generated(classes: Array[File]): Unit =