### Godot version

4.0.2

### System information

Ubuntu 22.04.1 LTS

### Issue description

So far I've found these ones:

![Screenshot from 2023-05-10 17-56-42](https://github.com/godotengine/godot/assets/85438892/b161b14a-cb7d-46fe-8398-816bf354a929)
![Screenshot from 2023-05-10 18-01-02](https://github.com/godotengine/godot/assets/85438892/b0fefcfb-4246-4ebb-ae7b-dd798d7a1d63)

But there are likely more like them. They are invalid, at least in the context I encountered them here (at the beginning of a regular line of script)

### Steps to reproduce

Type `Anchor` in the code editor.

### Minimal reproduction project

N/A
}
				} break;
				case GDScriptParser::Node::SUBSCRIPT: {
					const GDScriptParser::SubscriptNode *sub = static_cast<const GDScriptParser::SubscriptNode *>(par->initializer);
					if (sub->is_constant) {
						if (sub->datatype.kind == GDScriptParser::DataType::ENUM) {
							def_val = sub->get_datatype().to_string();
						} else if (sub->reduced) {
							const Variant::Type vt = sub->reduced_value.get_type();
							if (vt == Variant::Type::NIL || vt == Variant::Type::FLOAT || vt == Variant::Type::INT || vt == Variant::Type::STRING || vt == Variant::Type::STRING_NAME || vt == Variant::Type::BOOL || vt == Variant::Type::NODE_PATH) {
								def_val = sub->reduced_value.operator String();
							} else {
								def_val = sub->get_datatype().to_string() + sub->reduced_value.operator String();
							}
						}
					}
				} break;
				default:
					break;
			}
			arghint += " = " + def_val;
		}
		if (i == p_arg_idx) {
			arghint += String::chr(0xFFFF);
		}
	}
	arghint += ")";
	return arghint;
}
static void _get_directory_contents(EditorFileSystemDirectory *p_dir, HashMap<String, ScriptLanguage::CodeCompletionOption> &r_list) {