title: What is the r#""# operator in Rust?
body: <p>I saw the operator <code>r#""</code> in Rust but I can't find what it does. It came in handy for creating JSON:</p>
  
  <pre><code>let var1 = "test1";
  let json = r#"{"type": "type1", "type2": var1}"#;
  println!("{}", json) // =&gt; {"type2": "type1", "type2": var1}
  </code></pre>
  
  <p>What's the name of the operator <code>r#""</code>? How do I make <code>var1</code> evaluate?</p>