rustfmt deletes comments inbetween semicolons

[CGMossa]

Two issues I found while messing with this, first

fn main() {
    println!("Hello World! I think rustfmt deletes comments between two semicolons.");
    //if you run rustfmt..
    //these 
    //lines will disappear!
    //delete me!!
    ;
}

See playground.

And rustfmt panics if you have a block-comment inside two semicolons, like

fn main() {
    ;/* rustfmt panics!*/;
}

See playground.