code: public static String oneLiner(Throwable thrown)
    {
      StackTraceElement[] stack = thrown.getStackTrace();
      String topOfStack = null;
      if (stack.length > 0)
      {
        topOfStack = " at " + stack[0];
      }
      return thrown.toString() + topOfStack;
    }
docs: Produce a one line description of the throwable, suitable for error message
  and log printing.
  
  @param thrown thrown object
  @return description of the thrown object