src/Pure/General/ROOT.ML

 use "symbol.ML";
 use "secure.ML";
 use "name_space.ML";
 use "seq.ML";
 use "susp.ML";
-use "rat.ML";
 use "position.ML";
 use "path.ML";
 use "url.ML";
 use "file.ML";
 use "buffer.ML";