Hi!

I'd like to format my #[derive(..)] attributes vertically - like this:

#[derive(
  Clone,
  Default,
  PartialEq,
)]

I've tried the following in my rustfmt.toml, but this seemed to have no effect.

attr_fn_like_width = 1 # no effect?
attr_fn_like_width = 0 # nor this

Also adding a trailing comma to the list doesn't work. rustfmt just removes the comma and reformats the list horizontally.

Any help appreciated!