The meaning of r# in Rust

Two cases where you'd use r#

1. To use a Rust keyword as an identifier such as a variable name, function name, or module name, you can prefix the keyword with r#, and the compiler will then parse it as an identifier rather than a keyword.

pub struct Tool {
    /// The schema of the tool. Currently, only functions are supported.
    r#type: ToolType,
    /// The schema of the tool. Currently, only functions are supported.
    function: FunctionInfo,
}

2. When a string literal contains special characters, you can also add r# before the string and # at the end.

fn main(){

    let website = r#"
        "xiachedan.cn"
    "#;

    println!("{}",website);
}