【交互】分词报错时直接退出

```
> 11%3
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.7/bin/木兰", line 10, in <module>
    sys.exit(中())
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/木兰/中.py", line 46, in 中
    sys.exit(开始交互())
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/木兰/交互.py", line 137, in 开始交互
    交互(提示符1, 提示符2, 全局变量).cmdloop("木兰向您问好\n更多信息请说'你好'")
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/木兰/交互.py", line 119, in cmdloop
    (super().cmdloop)(*args, **kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/cmd.py", line 138, in cmdloop
    stop = self.onecmd(line)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/木兰/交互.py", line 84, in onecmd
    self.default(行)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/木兰/交互.py", line 90, in default
    if not self.括号已配对():
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/木兰/交互.py", line 113, in 括号已配对
    return 括号已配对(self.声明)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/木兰/交互.py", line 25, in 括号已配对
    for 词 in 各词:
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/rply/lexer.py", line 60, in __next__
    return self.next()
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/rply/lexer.py", line 57, in next
    raise LexingError(None, SourcePosition(self.idx, -1, -1))
rply.errors.LexingError: (None, SourcePosition(idx=2, lineno=-1, colno=-1))
```

木兰编程语言/mulan-rework

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