src/Pure/Thy/sessions.scala
changeset 73364 6bf6160a2c54
parent 73359 d8a0e996614b
child 73367 77ef8bef0593
--- a/src/Pure/Thy/sessions.scala	Thu Mar 04 16:08:30 2021 +0100
+++ b/src/Pure/Thy/sessions.scala	Thu Mar 04 16:23:34 2021 +0100
@@ -11,7 +11,7 @@
 import java.nio.channels.FileChannel
 import java.nio.file.StandardOpenOption
 
-import scala.collection.{SortedSet, SortedMap}
+import scala.collection.immutable.{SortedSet, SortedMap}
 import scala.collection.mutable