[godot#61386] Fix autoload scenes implicit types

modules/gdscript/gdscript_analyzer.cpp

@@ -3120,6 +3120,18 @@ void GDScriptAnalyzer::reduce_identifier(GDScriptParser::IdentifierNode *p_ident
 						result = type_from_metatype(singl_parser->get_parser()->head->get_datatype());
 					}
 				}
+			} else if (ResourceLoader::get_resource_type(autoload.path) == "PackedScene") {
+				Error err = OK;
+				Ref<GDScript> scr = GDScriptCache::get_packed_scene_script(autoload.path, err);
+				if (err == OK && scr.is_valid()) {
+					Ref<GDScriptParserRef> singl_parser = get_parser_for(scr->get_path());
+					if (singl_parser.is_valid()) {
+						err = singl_parser->raise_status(GDScriptParserRef::INTERFACE_SOLVED);
+						if (err == OK) {
+							result = type_from_metatype(singl_parser->get_parser()->head->get_datatype());
+						}
+					}
+				}
 			}
 			result.is_constant = true;
 			p_identifier->set_datatype(result);

modules/gdscript/gdscript_cache.cpp

@@ -360,6 +360,31 @@ Ref<PackedScene> GDScriptCache::get_packed_scene(const String &p_path, Error &r_
 	return scene;
 }
 
+Ref<GDScript> GDScriptCache::get_packed_scene_script(const String &p_path, Error &r_error) {
+	r_error = OK;
+	Ref<PackedScene> scene = get_packed_scene(p_path, r_error);
+
+	if (r_error != OK) {
+		return Ref<GDScript>();
+	}
+
+	int node_count = scene->get_state()->get_node_count();
+	if (node_count == 0) {
+		return Ref<GDScript>();
+	}
+
+	const int ROOT_NODE = 0;
+	for (int i = 0; i < scene->get_state()->get_node_property_count(ROOT_NODE); i++) {
+		if (scene->get_state()->get_node_property_name(ROOT_NODE, i) != SNAME("script")) {
+			continue;
+		}
+
+		return scene->get_state()->get_node_property_value(ROOT_NODE, i);
+	}
+
+	return Ref<GDScript>();
+}
+
 void GDScriptCache::clear_unreferenced_packed_scenes() {
 	if (singleton == nullptr) {
 		return;

modules/gdscript/gdscript_cache.h

@@ -102,6 +102,7 @@ public:
 	static Error finish_compiling(const String &p_owner);
 
 	static Ref<PackedScene> get_packed_scene(const String &p_path, Error &r_error, const String &p_owner = "");
+	static Ref<GDScript> get_packed_scene_script(const String &p_path, Error &r_error);
 	static void clear_unreferenced_packed_scenes();
 
 	static bool is_destructing() {