let (cond_str, used_width) = try_opt!(self.rewrite_cond(context, shape, &alt_block_sep));
// If `used_width` is 0, it indicates that whole control flow is written in a single line.
if used_width == 0 {
let (cond_str, used_width) = try_opt!(self.rewrite_cond(context, shape, &alt_block_sep));
// If `used_width` is 0, it indicates that whole control flow is written in a single line.
if used_width == 0 {