diff -r 220d19f3e074 -r b3f738f12a9a src/Pure/System/command_line.scala
--- a/src/Pure/System/command_line.scala	Sat Apr 04 20:16:25 2020 +0200
+++ b/src/Pure/System/command_line.scala	Sat Apr 04 20:53:36 2020 +0200
@@ -26,7 +26,7 @@
   def tool(body: => Unit)
   {
     val thread =
-      Standard_Thread.fork(name = "isabelle", inherit_locals = true) {
+      Standard_Thread.fork(name = "command_line", inherit_locals = true) {
         val rc =
           try { body; 0 }
           catch {