### Godot version

v4.0.beta14.official [28a24639c]

### System information

MacOS 12.6.2

### Issue description

Beta 14 throws an error for custom `@icon`, e.g.
```
class_name StateMachine extends Node

@icon("res://assets/icons/state_machine.svg")
```
> Annotation "`@icon`" is not allowed in this level.

In beta 13 and before that worked fine.

### Steps to reproduce

1. Add a custom `@icon` in a custom node script.
2. Error message: Annotation "`@icon`" is not allowed in this level.

There are possibly other errors because a `class_name` node is now not recognized if extended by other classes, but they should resolve if `@icon` is removed.

### Minimal reproduction project

N/A
}
			}
		} else {
			
			if (enum_node->values[i].line != enum_node->values[i + 1].line && has_comment(enum_node->values[i].line)) {
				if (named) {
					enum_node->values.write[i].doc_description = get_doc_comment(enum_node->values[i].line, true);
				} else {
					current_class->set_enum_value_doc(enum_node->values[i].identifier->name, get_doc_comment(enum_node->values[i].line, true));
				}
			}
		}
	}
#endif 
	complete_extents(enum_node);
	end_statement("enum");
	return enum_node;
}
void GDScriptParser::parse_function_signature(FunctionNode *p_function, SuiteNode *p_body, const String &p_type) {
	if (!check(GDScriptTokenizer::Token::PARENTHESIS_CLOSE) && !is_at_end()) {
		bool default_used = false;
		do {
			if (check(GDScriptTokenizer::Token::PARENTHESIS_CLOSE)) {
				
				break;
			}
			ParameterNode *parameter = parse_parameter();
			if (parameter == nullptr) {
				break;
			}