rustfmt doesn't format this code

[TeXitoi]

Here a case where rustfmt doesn't do anything. I tried to simplify to the maximum the use case. If you remove (almost) any character, rustfmt does its job.

fn main() {
    n()
            .ser(a
            .app(
                default().limieeeeeeeeeeeeeeeeet().error_handler(|err, req| {
                    error!("Invalid model    req                      ", "error" => err.to_string());
                }
            )
        )
    )
}

Tested with the latest nightly: rustfmt 1.4.12-nightly (9f53665 2020-02-10)

[calebcartwright]

I believe this is due to a known existing issue with chains wherein if the formatted result for any individual chain element exceeds the max_width value then rustmft leaves the entire original chain snippet as is.

Refs (and likely duplicate of) #3863

[topecongiro]

@TeXitoi @calebcartwright Thanks, this is indeed a duplicate of #3863.