error: invalid format string: expected `'}'`, found `'?'`
--> src/main.rs:21:47
|
21 | println!("upstream peer is: {:upstream?}");
| - ^ expected `'}'` in format string
| |
| because of this opening brace
|
= note: if you intended to print `{`, you can escape it using `{{`
error: could not compile `pnginx` (bin "pnginx") due to 1 previous error
Otherwise you get this error: