Rust 向量语法经常出错

[SyntaxError6666]

如题，具体情况是这样的：在简单场景下不经常出问题，但是如果输入比较多或者问题复杂那么 Rust 向量 vec! 宏的用法就会出现明显错误且在接下来的对话中无法纠正。

[SyntaxError6666]

顺便补充一下另一个问题：当输入很长的时候，输出很可能夹杂 unexpected 的“极”字，且无法纠正。

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