Comment after let exceeds max width

[topecongiro]

Input

fn foo() {
    let file_name =
        format!("{}", self.testpaths.file.display())
        .replace(r"\", "/"); // on windows, translate all '\' path separators to '/'
}

Output

fn foo() {
    let file_name = format!("{}", self.testpaths.file.display()).replace(r"\", "/"); // on windows, translate all '\' path separators to '/'
}

Meta

0.2.16-nightly (4e04e82 2017-11-28)

The above example is taken from https://github.com/rust-lang/rust/blob/8937d6a6cfb011d9e1fe6b4a426913dbbf9fd584/src/tools/compiletest/src/runtest.rs#L1007-L1009.

[Athe81]

Issue looks solved with 1.4.18-nightly (c1e9b7b8 2020-06-13)

Output:

fn foo() {
    let file_name = format!("{}", self.testpaths.file.display()).replace(r"\", "/");
    // on windows, translate all '\' path separators to '/'
}

[whizsid]

I am working on this issue

[shulaoda]

If I understand correctly, this issue has already been resolved — at least in this particular case.

[ytmimi]

I can still reproduce the issue described in the original comment with rustfmt 1.8.0-nightly (292865f 2025-10-09).

[shulaoda]

I can still reproduce the issue described in the original comment with rustfmt 1.8.0-nightly (292865f 2025-10-09).

I think I misunderstood earlier — when I set max_width to <70, it behaves correctly. It seems that the length of the let statement isn’t counted together with the comment, which explains the result.

[ytmimi]

@shulaoda when triaging it's best to use the default rustfmt configs unless the issue specifies that certain configs are needed to reproduce the issue.