### 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)

}
	GDScriptParser::DataType resolving_datatype;
	resolving_datatype.kind = GDScriptParser::DataType::RESOLVING;
	p_class->base_type = resolving_datatype;
	
	GDScriptParser::DataType class_type;
	class_type.is_constant = true;
	class_type.is_meta_type = true;
	class_type.type_source = GDScriptParser::DataType::ANNOTATED_EXPLICIT;
	class_type.kind = GDScriptParser::DataType::CLASS;
	class_type.class_type = p_class;
	class_type.script_path = parser->script_path;
	class_type.builtin_type = Variant::OBJECT;
	p_class->set_datatype(class_type);
	GDScriptParser::DataType result;
	if (!p_class->extends_used) {
		result.type_source = GDScriptParser::DataType::ANNOTATED_INFERRED;
		result.kind = GDScriptParser::DataType::NATIVE;
		result.native_type = SNAME("RefCounted");
	} else {
		result.type_source = GDScriptParser::DataType::ANNOTATED_EXPLICIT;
		GDScriptParser::DataType base;
		int extends_index = 0;
		if (!p_class->extends_path.is_empty()) {
			if (p_class->extends_path.is_relative_path()) {
				p_class->extends_path = class_type.script_path.get_base_dir().path_join(p_class->extends_path).simplify_path();
			}
			Ref<GDScriptParserRef> ext_parser = get_parser_for(p_class->extends_path);
			if (ext_parser.is_null()) {
				push_error(vformat(R"(Could not resolve super class path "%s".)", p_class->extends_path), p_class);