diff -r 186e07be32c3 -r a004c5322ea4 src/Pure/Admin/check_sources.scala
--- a/src/Pure/Admin/check_sources.scala	Tue Jan 03 15:42:25 2023 +0100
+++ b/src/Pure/Admin/check_sources.scala	Tue Jan 03 16:05:07 2023 +0100
@@ -10,7 +10,7 @@
 object Check_Sources {
   def check_file(path: Path): Unit = {
     val file_name = path.implode
-    val file_pos = Position.File(path.implode_symbolic)
+    val file_pos = Position.File(File.symbolic_path(path))
     def line_pos(i: Int) = Position.Line_File(i + 1, file_name)
 
     if (space_explode('/', Word.lowercase(path.expand.drop_ext.implode)).contains("aux"))