Extra indentation in macro_rules!

[UltraMachine]

rustfmt 1.4.12-stable (a828ffe 2020-03-11)

For example, this:

macro_rules! bit {
    ($bool:expr) => {
        if $bool {
            1
        } else {
            0
        }
    };
}
macro_rules! add_one {
    ($vec:expr) => {
        {
            $vec.push(1);
        }
    };
}

Formatted into:

macro_rules! bit {
    ($bool:expr) => {
        if $bool {
                1
        } else {
                0
            }
    };
}
macro_rules! add_one {
    ($vec:expr) => {{
        $vec.push(1);
        }};
}

[UltraMachine]

I have this issue when hard_tabs = true