// returns L<S|L>
static L recursiveJavaTok(S s) {
  L tok = cloneList(javaTokWithBrackets(s));
  for (int i = 1; i < l(tok); i += 2)
    if (startsWithOneOf(t, "(", "{"))
      tok.set(i, recursiveJavaTok(s));
  }
  ret tok;
}