fix no-default-features

crates/stecs-derive/src/split.rs

@@ -364,6 +364,12 @@ This struct is a version of `{struct_name}` that holds each field in its own [St
 
         // struct StructOf
         let struct_of = {
+            #[cfg(not(feature = "dynamic"))]
+            let dynamic = quote! {};
+            #[cfg(feature = "dynamic")]
+            let dynamic =
+                quote! { pub r#dyn: ::stecs::dynamic::DynamicStorage<#generic_family_name::Id>, };
+
             let struct_of_doc = format!(
                 r#"Generated by `#[derive(SplitFields)]`.
 This struct is a version of `{struct_name}` that holds each field in its own [Storage](::stecs::storage::Storage).
@@ -376,7 +382,7 @@ This struct is a version of `{struct_name}` that holds each field in its own [St
                 #vis struct #struct_of_name<#generics_family> {
                     pub ids: #generic_family_name::Generator,
                     pub inner: #struct_split_name<#generics_family_use>,
-                    pub r#dyn: ::stecs::dynamic::DynamicStorage<#generic_family_name::Id>,
+                    #dynamic
                 }
             }
         };