带有scala的Euler4 - 评论中明显的utf8禁止编译

Question

我刚开始用Scala在学习曲线上奋斗。我通常通过实施前20个左右的欧拉问题来做这种事情。当我击中＃4时，事情发生了翻天覆地的变化。

/*
    A palindromic number reads the same both ways. 
    The largest palindrome made from the product of two 2-digit numbers is 9009 = 91 × 99.

    Find the largest palindrome made from the product of two 3-digit numbers.
*/

object Four
{
    def main(args: Array[String]) 
    {
        println("start");
        println("end");
    }
}

虽然它可能不会向你跳出来，但注释中91到99之间的x实际上是一个unicode x，它被编码为D7。如果我将其更改为ASCII X，程序将按预期编译并运行。如果我保持原样，程序似乎运行，但没有输出。

从命令行运行

c:\projects\Euler>scalac -feature euler4.scala
error: IO error while decoding euler4.scala with UTF-8
Please try specifying another one using the -encoding option
one error found

对SO的一些研究建议指定编码

c:\projects\Euler>scalac -encoding UTF-8 -feature euler4.scala
error: IO error while decoding euler4.scala with UTF-8
Please try specifying another one using the -encoding option
one error found

我的配置是Windows 10 “欢迎使用Scala 2.12.1（Java HotSpot（TM）64位服务器VM，Java 1.8.0_121）。”