Highlight Attributes

#[allow(dead_code)]
#[rustfmt::skip]
#[proc_macros::identity]
#[derive(Default)]
/// This is a doc comment
// This is a normal comment
/// This is a doc comment
#[derive(Copy)]
// This is another normal comment
/// This is another doc comment
// This is another normal comment
#[derive(Copy, Unresolved)]
// The reason for these being here is to test AttrIds
enum Foo {
    #[default]
    Bar
}