srecord IndexedWikiPage(S title, long start, int len) {}

please include function iteratorFromFunction.

static IterableIterator<IndexedWikiPage> indexSimpleWikipedia() {

  File f = unpackSimpleWikipedia();

  final ByteCountingLineReader reader = new(bufferedFileInputStream(f, 1024*1024));

  ret main.<IndexedWikiPage> iteratorFromFunction(new O {

    int lines = 0, pages = 0;

    IndexedWikiPage get() ctex {

      long pageStart = 0;

      StringBuilder pageBuf = null;

      while licensed {

        long offset = reader.byteCount();

        S line = reader.readLine();

        if (line == null) break;

        line = trim(line);

        if (eq(line, "<page>")) {

          pageStart = offset;

          pageBuf = new StringBuilder;

        }

        if (pageBuf != null)

          pageBuf.append(line).append("\n");

        if (eq(line, "</page>")) {

          L<S> tok = htmlTok(str(pageBuf));

          S title = trim(htmldecode(join(contentsOfContainerTag(tok, "title"))));

          if ((++pages % 1000) == 0) {

            fractionDone(pages/228400.0);

            print("Pages: " + pages + " (" + title + ")");

            sleep(1);

          }

          ret new IndexedWikiPage(title, pageStart, toInt(reader.byteCount()-pageStart));

        }

      }

      fractionDone(1);

      reader.close();

      null;

    }

  });

}