src/Pure/General/mercurial.scala

     -C           clean all unknown/ignored files on target
                  (implies -n for testing; use option -f to confirm)
     -F RULE      add rsync filter RULE (e.g. "protect /foo" to avoid deletion)
     -R ROOT      explicit repository root directory
                  (default: implicit from current directory)
-    -T           thorough check of file content (default: time and size)
+    -T           thorough treatment of file content and directory times
     -f           force changes: no dry-run
     -n           no changes: dry-run
     -r REV       explicit revision (default: state of working directory)
     -v           verbose