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src/Pure/Tools/mkroot.scala
changeset 83435 0f9bae334ac6
parent 76558 d6a2a8bc40e1 
--- a/src/Pure/Tools/mkroot.scala	Sat Nov 01 00:04:57 2025 +0100
+++ b/src/Pure/Tools/mkroot.scala	Sat Nov 01 13:56:39 2025 +0100
@@ -30,7 +30,7 @@
     Isabelle_System.make_directory(session_dir)
 
     val name = proper_string(session_name) getOrElse session_dir.absolute_file.getName
-    val parent = proper_string(session_parent) getOrElse Isabelle_System.getenv("ISABELLE_LOGIC")
+    val parent = proper_string(session_parent) getOrElse Isabelle_System.default_logic()
 
     val root_path = session_dir + Sessions.ROOT
     if (root_path.file.exists) error("Cannot overwrite existing " + root_path)
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