Function write_extra

fn write_extra<'tcx, F>(
    tcx: TyCtxt<'tcx>,
    write: &mut dyn Write,
    visit_op: F,
    options: PrettyPrintMirOptions,
) -> Result<()>
where
    F: FnMut(&mut ExtraComments<'tcx>),

After we print the main statement, we sometimes dump extra information. There’s often a lot of little things “nuzzled up” in a statement.