// call veryQuickJava_transpiled.set("") beforehand to get
// transpiled code in veryQuickJava_transpiled!
sO dm_javaEvalWithTimeout(double timeoutSeconds, S expression) {
  S tl = veryQuickJava_transpiled!;
  new Var<S> transpilation;
  try {
    ret evalWithTimeoutOrFail(timeoutSeconds, () -> {
      veryQuickJava_transpiled.set(tl);
      try {
        ret dm_javaEval(expression);
      } finally {
        transpilation.set(veryQuickJava_transpiled!);
      }
    });
  } finally {
    veryQuickJava_transpiled.set(transpilation!);
  }
}

Began life as a copy of #1017136