code: public static void writeSymbolToFileEntries(final Iterable<Map.Entry<Symbol, File>> entries,
        final CharSink sink) throws IOException {
  
      writeUnixLines(
          transform(
              MapUtils.transformValues(entries, toAbsolutePathFunction()),
              TO_TAB_SEPARATED_ENTRY),
          sink);
    }
docs: Writes map entries from symbols to file absolute paths to a file. Each line has a mapping with
  the key and value separated by a single tab.  The file will have a trailing newline.  Note that
  the same "key" may appear in the file with multiple mappings.