src/Pure/System/components.scala

--- a/src/Pure/System/components.scala	Thu Mar 28 11:35:39 2024 +0100
+++ b/src/Pure/System/components.scala	Thu Mar 28 11:45:45 2024 +0100
@@ -213,7 +213,10 @@
 
     def write_platforms(
       lines: List[String] = Platform.Family.list.map(family => family.toString + " = ")
-    ): Unit = File.write(platform_props, terminate_lines(lines))
+    ): Directory = {
+      File.write(platform_props, terminate_lines(lines))
+      this
+    }
 
     def get_platforms(): Platforms = {
       val props_path = platform_props.expand