### Godot version

4.0 beta 10

### System information

Windows 10

### Issue description

Godot crashes when i accidently name 2 items in an enum the same

EDIT:
The editor freeze for some seconds, then both editor- and console-window dissapear

### Steps to reproduce

Write

```gdscript
enum {
    A,
}
```

and then add a second line with another A:

```gdscript
enum {
    A,
    A # <- crash
}
```

Does not always immediatly happen if i copy&paste items.
Does not happen when i change the script in another editor and open the script in Godot.

### Minimal reproduction project

[enum.zip](https://github.com/godotengine/godot/files/10313759/enum.zip)

while (base_script.is_valid() && base_script->has_method(function_name)) {
		MethodInfo info = base_script->get_method_info(function_name);
		if (!(info == MethodInfo())) {
			return function_signature_from_info(info, r_return_type, r_par_types, r_default_arg_count, r_static, r_vararg);
		}
		base_script = base_script->get_base_script();
	}
	
	if (p_base_type.is_meta_type && !p_is_constructor && (p_base_type.kind == GDScriptParser::DataType::SCRIPT || p_base_type.kind == GDScriptParser::DataType::CLASS)) {
		MethodInfo info;
		StringName script_class = p_base_type.kind == GDScriptParser::DataType::SCRIPT ? p_base_type.script_type->get_class_name() : StringName(GDScript::get_class_static());
		if (ClassDB::get_method_info(script_class, function_name, &info)) {
			return function_signature_from_info(info, r_return_type, r_par_types, r_default_arg_count, r_static, r_vararg);
		}
	}
	if (p_is_constructor) {
		
		r_return_type = p_base_type;
		r_return_type.type_source = GDScriptParser::DataType::ANNOTATED_EXPLICIT;
		r_return_type.is_meta_type = false;
		return true;
	}
	MethodInfo info;
	if (ClassDB::get_method_info(base_native, function_name, &info)) {
		bool valid = function_signature_from_info(info, r_return_type, r_par_types, r_default_arg_count, r_static, r_vararg);
		if (valid && Engine::get_singleton()->has_singleton(base_native)) {
			r_static = true;
		}
		return valid;
	}