在 Rust 中如何在格式化字符串中转义大括号

我想写这个

write!(f, "{ hash:{}, subject: {} }", self.hash, self.subject)

但是由于花括号对于格式化有特殊的意义，很明显我不能像那样放置外部花括号而不转义。所以我试图逃离他们。

write!(f, "\{ hash:{}, subject: {} \}", self.hash, self.subject)

Rust 也不喜欢这样，然后我读到这个:

字面字符{、}或 # 可以通过在字符前面加上字符来包含在字符串中。因为在 Rust 字符串中已经是一个转义字符，所以使用这个转义字符的字符串文字看起来像“{”。

所以我尽力了

write!(f, "\\{ hash:{}, subject: {} \\}", self.hash, self.subject)

但这也不管用

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最佳答案

You might be reading some out of date docs (e.g. for Rust 0.9)

As of Rust 1.0, the way to escape ABC0 and } is with another ABC0 or }

write!(f, "\{\{ hash:{}, subject: {} }}", self.hash, self.subject)

The literal characters { and } may be included in a string by preceding them with the same character. For example, the { character is escaped with \{\{ and the } character is escaped with }}.