Avoid #[cfg] on parameter due to #[doc(cfg)] post-processing

Author: Bromeon

godot-core/src/obj/traits.rs

@@ -630,10 +630,15 @@ pub mod cap {
 
     /// Auto-implemented for `#[godot_api] impl XyVirtual for MyClass` blocks
     pub trait ImplementsGodotVirtual: GodotClass {
+        // Cannot use #[cfg(since_api = "4.4")] on the `hash` parameter, because the doc-postprocessing generates #[doc(cfg)],
+        // which isn't valid in parameter position.
+
+        #[cfg(before_api = "4.4")]
+        #[doc(hidden)]
+        fn __virtual_call(name: &str) -> sys::GDExtensionClassCallVirtual;
+
+        #[cfg(since_api = "4.4")]
         #[doc(hidden)]
-        fn __virtual_call(
-            name: &str,
-            #[cfg(since_api = "4.4")] hash: u32,
-        ) -> sys::GDExtensionClassCallVirtual;
+        fn __virtual_call(name: &str, hash: u32) -> sys::GDExtensionClassCallVirtual;
     }
 }