static void tok_ifCast(L<S> tok) {
  if (!tok.contains("cast")) ret;
  int i;
  while ((i = jfind(tok, "if (<id> cast <id>")) >= 0) {
    int iClosing = indexOf(tok, i, ")")-1;
    S var = tok.get(i+4), type = joinSubList(tok, i+8, j-2);
    int start = iClosing+2, end = findEndOfStatement(tok, start);
    tok.set(i+6, "instanceof");
    for (int j = start; j < end; j += 2)
      if (eq(tok.get(j), var) && neqGet(tok, j-2, "."))
        tok.set(j, "((" + type + ") " + var + ")");
    reTok(tok, i+6, end);
  }
}