Warn when using old #[export] syntax

Author: Bromeon

gdnative-core/src/export/macros.rs

@@ -35,6 +35,13 @@ macro_rules! deprecated_reference_return {
     () => {};
 }
 
+#[doc(hidden)]
+#[macro_export]
+#[deprecated = "#[export] is deprecated and will be removed in the next major version. Use #[godot] instead."]
+macro_rules! deprecated_export_syntax {
+    () => {};
+}
+
 #[doc(hidden)]
 #[macro_export]
 macro_rules! godot_wrap_method_void {

gdnative-core/src/export/mod.rs

@@ -26,9 +26,9 @@ pub(crate) mod type_tag;
 
 pub mod user_data;
 
-#[allow(deprecated)]
-pub use crate::deprecated_reference_return;
 pub use crate::godot_wrap_method;
+#[allow(deprecated)]
+pub use crate::{deprecated_export_syntax, deprecated_reference_return};
 pub use class::*;
 pub use class_builder::*;
 pub use method::*;

gdnative-derive/src/methods.rs

@@ -141,8 +141,14 @@ pub(crate) fn derive_methods(item_impl: ItemImpl) -> TokenStream2 {
                 }
             });
 
+            let warn_deprecated_export = if export_args.is_old_syntax {
+                Some(quote_spanned!(ret_span=> ::gdnative::export::deprecated_export_syntax!();))
+            } else {
+                None
+            };
+
             // See gdnative-core::export::deprecated_reference_return!()
-            let deprecated = if let syn::ReturnType::Type(_, ty) = &sig.output {
+            let warn_deprecated_ref_return  = if let syn::ReturnType::Type(_, ty) = &sig.output {
                 if !is_deref_return && matches!(**ty, syn::Type::Reference(_)) {
                     quote_spanned!(ret_span=> ::gdnative::export::deprecated_reference_return!();)
                 } else {
@@ -164,7 +170,8 @@ pub(crate) fn derive_methods(item_impl: ItemImpl) -> TokenStream2 {
                         .with_rpc_mode(#rpc)
                         .done_stateless();
 
-                    #deprecated
+                    #warn_deprecated_export
+                    #warn_deprecated_ref_return
                 }
             )
         })