Comments in match partially aligned when using `hard_tabs`

[ginnyTheCat]

When using the hard_tabs option the last two comments are aligned, but none of the previous ones:

fn year_path(year: u16) -> Option<&'static str> {
	Some(match year {
		2020.. => "Current", // https://www.indianamap.org/datasets/INMap::indiana-current-imagery/about
		2016.. => "2016_2019", // https://www.indianamap.org/datasets/INMap::indiana-2016-2019-imagery/about
		2011.. => "2011_2013", // https://www.indianamap.org/datasets/INMap::indiana-imagery-2011-2013/about
		2005.. => "2005",      // https://www.indianamap.org/datasets/INMap::indiana-2005-imagery/about
		_ => return None,
	})
}

Adding a character in "2011_2013" causes the comment in the line below to also move one space to the right. Adding two more characters to the string however causes this "bond" to break.

Disabling the hard_tabs option causes the formatting to be more consistent again:

fn year_path(year: u16) -> Option<&'static str> {
    Some(match year {
        2020.. => "Current", // https://www.indianamap.org/datasets/INMap::indiana-current-imagery/about
        2016.. => "2016_2019", // https://www.indianamap.org/datasets/INMap::indiana-2016-2019-imagery/about
        2011.. => "2011_2013", // https://www.indianamap.org/datasets/INMap::indiana-imagery-2011-2013/about
        2005.. => "2005", // https://www.indianamap.org/datasets/INMap::indiana-2005-imagery/about
        _ => return None,
    })
}

[ytmimi]

What version of rustfmt are you using? Also, what configurations besides hard_tabs are you setting? Are you invoking rustfmt directly or via cargo fmt?

[ginnyTheCat]

I tried this on both 1.8.0 stable and nightly 2026-02-05. For this reproduction I only wrote hard_tabs = true into a rustfmt.toml file. I called cargo fmt but it occurs as well when running rustfmt directly.

[ytmimi]

For reference, what edition is the cargo project using?

[ginnyTheCat]

I was using edition 2024, but all other editions and style editions trigger this bug as well.