// returns safeUnstructure()'d result
// code can be an expression or a list of statements
static O quickPhoneEval(S code) {
  // Code to run on the phone spontaneously
  S src = evalJava_prep(code, "_calc");
  S answer = quickRunOnPhone(src);
  if (!swic(answer, "ok "))
    fail(print(unquote(answer)));
  
  ret safeUnstructure(answer.substring(3));
}