static <A> F1<S, A> codeWithHintsToFunctionOnString(S code, S hints) {
  code = trim(code);
  if (isIdentifier(code)) { // name of standard function
    Class c = loadFunctions_cached_withInit(code);
    final Method m = findMethod_precise(c, code, "");
    if (m == null) fail("Not a method on a string: " + code);
    ret func(S s) -> A { (A) invokeMethod(m, null, s) };
  }
  fail("todo");
}