render

Author: Bleachfuel

crates/bevy_asset/macros/src/lib.rs

@@ -80,7 +80,7 @@ fn derive_dependency_visitor_internal(
                 let field_visitors = field_locals.clone().map(|i| visit_dep(quote!(#i)));
                 quote!(Self::#ident {#(#field_members: #field_locals,)* ..} => {
                     #(#field_visitors)*
-                },)
+                })
             });
 
             any_case_required.then(|| quote!(match self { #(#cases)*, _ => {} }))

crates/bevy_macro_utils/src/shape.rs

@@ -1,4 +1,4 @@
-use syn::{spanned::Spanned, Data, DataEnum, DataUnion, Error, Fields};
+use syn::{Data, DataEnum, DataUnion, Error, Field, Fields, punctuated::Punctuated, spanned::Spanned, token::Comma};
 
 /// Get the fields of a data structure if that structure is a struct;
 /// otherwise, return a compile error that points to the site of the macro invocation.
@@ -17,3 +17,12 @@ pub fn get_struct_fields<'a>(data: &'a Data, meta: &str) -> Result<&'a Fields, E
         )),
     }
 }
+
+/// Return an error if `Fields` is not `Fields::Named`
+pub fn require_named<'a>(fields: &'a Fields) -> Result<&'a Punctuated<Field, Comma>, Error> {
+    if let Fields::Named(fields) = fields {
+        Ok(&fields.named)
+    } else {
+        Err(Error::new(fields.span(), "Unnamed fields are not supported here"))
+    }
+}

crates/bevy_render/macros/src/specializer.rs

@@ -1,6 +1,6 @@
 use bevy_macro_utils::{
     fq_std::{FQDefault, FQResult},
-    get_struct_fields,
+    get_struct_fields, require_named,
 };
 use proc_macro::TokenStream;
 use proc_macro2::Span;
@@ -225,8 +225,9 @@ pub fn impl_specializer(input: TokenStream) -> TokenStream {
     let ecs_path = crate::bevy_ecs_path();
 
     let ast = parse_macro_input!(input as DeriveInput);
-    let targets = guard!(get_specialize_targets(&ast, "Specializer"));
+        let targets = guard!(get_specialize_targets(&ast, "Specializer"));
     let fields = guard!(get_struct_fields(&ast.data, "Specializer"));
+    let fields = guard!(require_named(fields));
     let field_info = guard!(get_field_info(fields, &targets));
 
     let key_idents: Vec<Option<Ident>> = field_info