Divergent case: rustfmt increases indentation on each invocation in rustfmt::skip'd block

[horazont]

In the following example, rustfmt increases the indentation of the line with }); by one level each time it is run:

macro_rules! pwm_timer_init {
    ($tim:expr) => {{
        let tim = $tim;
        #[rustfmt::skip]
        tim.ccmr1_output().write(|w| {
            w
                .oc1pe().enabled()
                .oc1m().pwm_mode1()
                .oc2pe().enabled()
                .oc2m().pwm_mode1()
        });
    }};
}

This is also visible in the nightly version of the playground, though I found it with rustfmt 1.5.1-stable (4b91a6e 2022-08-08).

[ytmimi]

looking into this a little more, and I think this issue might have to do with the #[rustfmt::skip] attribute.

Input

macro_rules! pwm_timer_init {
    ($tim:expr) => {{
        let tim = $tim;
        tim.ccmr1_output().write(|w| {
            w
                .oc1pe().enabled()
                .oc1m().pwm_mode1()
                .oc2pe().enabled()
                .oc2m().pwm_mode1()
        });
    }};
}

Note: the }); is not indented in the following output after formatting with rustfmt 1.5.1-nightly (ef911542 2022-09-19)

Output

macro_rules! pwm_timer_init {
    ($tim:expr) => {{
        let tim = $tim;
        tim.ccmr1_output().write(|w| {
            w.oc1pe()
                .enabled()
                .oc1m()
                .pwm_mode1()
                .oc2pe()
                .enabled()
                .oc2m()
                .pwm_mode1()
        });
    }};
}

[ytmimi]

Similar issue (#5489), but might not be the same underlying problem.