How to escape curly braces in a format string in Rust

Question

I want to write this

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

But since curly braces have special meaning for forma

Answer 1

You might be reading some out of date docs (e.g. for Rust 0.9)

As of Rust 1.0, the way to escape { and } is with another { 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 }}.