Removing braces from format string

[nrc]

My repro is nested inside a macro, but I'm not sure if that is important:

             macro_rules! add_message_to_notes {
-                ($msg:expr) => {{
+                ($msg: expr) => {{
                     let mut lines = message.lines();
                     notes.push_str(&format!("\n{}: {}", level, lines.next().unwrap()));
                     for line in lines {
                         notes.push_str(&format!(
-                            "\n{:indent$}{line}",
+                            "\n{:indent$line}",
                             "",
                             indent = level.len() + 2,
                             line = line,
                         ));
                     }
-                }}
+                }};
             }

The error is removing }{ from "\n{:indent$}{line}"

[topecongiro]

I doubt that replace_names is doing somthing wrong, so I think being inside a macro is relevant.