--- a/src/Pure/System/isabelle_system.scala Thu Sep 09 13:47:29 2021 +0200
+++ b/src/Pure/System/isabelle_system.scala Thu Sep 09 14:05:31 2021 +0200
@@ -111,7 +111,7 @@
def isabelle_id(root: Path = Path.ISABELLE_HOME): String =
getetc("ISABELLE_ID", root = root) orElse Mercurial.archive_id(root) getOrElse {
if (Mercurial.is_repository(root)) Mercurial.repository(root).parent()
- else error("Failed to identify Isabelle distribution " + root)
+ else error("Failed to identify Isabelle distribution " + root.expand)
}
object Isabelle_Id extends Scala.Fun_String("isabelle_id")