diff -r 70032f83b9be -r 0a868098fcc0 src/Pure/Admin/build_polyml.scala
--- a/src/Pure/Admin/build_polyml.scala	Wed Oct 14 21:36:17 2020 +0200
+++ b/src/Pure/Admin/build_polyml.scala	Wed Oct 14 21:42:54 2020 +0200
@@ -147,7 +147,7 @@
 
   /** skeleton for component **/
 
-  private def extract_sources(source_archive: Path, component_dir: Path) =
+  private def extract_sources(source_archive: Path, component_dir: Path)
   {
     if (source_archive.get_ext == "zip") {
       Isabelle_System.bash(