src/Pure/System/process_result.scala

--- a/src/Pure/System/process_result.scala	Thu Jan 16 13:14:24 2025 +0100
+++ b/src/Pure/System/process_result.scala	Thu Jan 16 22:48:16 2025 +0100
@@ -18,6 +18,8 @@
     val interrupt = 130
     val timeout = 142
 
+    val regular: Set[Int] = Set(ok, error)
+
     private def text(rc: Int): String = {
       val txt =
         rc match {