Ignore comma at the end of stream

[ethe]

support #93
rustfmt would auto format

pub fn some_tream() -> Option<impl Stream> {
    Some(#[stream] async {
        yield 1;
    })
}

to

pub fn some_tream() -> Option<impl Stream> {
    Some(
        #[stream]
        async {
            yield 1;
        },
    )
}

the comma at the end of stream block should be ignored.

[taiki-e]

Thanks!

[taiki-e]

Published in 0.2.10.