allow more kinds of empty structs

Author: joseph-gio

crates/bevy_macro_utils/src/lib.rs

@@ -187,7 +187,7 @@ pub fn derive_label(
             for (i, v) in d.variants.iter().enumerate() {
                 // Variants must either be fieldless, or explicitly ignore the fields.
                 let ignore_fields = v.attrs.iter().any(|a| is_ignore(a, attr_name));
-                if matches!(v.fields, syn::Fields::Unit) | ignore_fields {
+                if v.fields.is_empty() || ignore_fields {
                     let mut path = syn::Path::from(ident.clone());
                     path.segments.push(v.ident.clone().into());