rustfmt does not put short if-else at the end of the block

[topecongiro]

As of rustfmt 0.8.2-nightly (08da30d 2018-06-06), rustfmt formats short if expressions like the following:

fn plain_if(x: bool) -> u8 {
    if x {
        0
    } else {
        1
    }
}

fn paren_if(x: bool) -> u8 {
    (if x { 0 } else { 1 })
}

fn let_if(x: bool) -> u8 {
    let x = if x { 0 } else { 1 };
    x
}

fn return_if(x: bool) -> u8 {
    return if x { 0 } else { 1 };
}

This is becuase the if in plain_if is parsed as a statement, whereas others are parsed as an expression (rustfmt rewrites if in a single line only when it apprears in the expression place).