### Godot version

Beta 17, master

### System information

Windows 11

### Issue description

Godot gets a hard crash while attempting to code-complete for member `const` of a class.

### Steps to reproduce

```GDScript
enum E { V1 }

const e := E
```

And then type a `.` after the last `E`, which triggers code hints/auto-completion for subscripts based on `E` and causes a hard crash.

Does not happen for `var e := E.V1`.

### Minimal reproduction project

See above.
MethodInfo function_info = info_from_utility_func(function_name);
			if (!p_is_root && !p_is_await && function_info.return_val.type == Variant::NIL && ((function_info.return_val.usage & PROPERTY_USAGE_NIL_IS_VARIANT) == 0)) {
				push_error(vformat(R"*(Cannot get return value of call to "%s()" because it returns "void".)*", function_name), p_call);
			}
			if (all_is_constant && Variant::get_utility_function_type(function_name) == Variant::UTILITY_FUNC_TYPE_MATH) {
				
				Vector<const Variant *> args;
				for (int i = 0; i < p_call->arguments.size(); i++) {
					args.push_back(&(p_call->arguments[i]->reduced_value));
				}
				Variant value;
				Callable::CallError err;
				Variant::call_utility_function(function_name, &value, (const Variant **)args.ptr(), args.size(), err);
				switch (err.error) {
					case Callable::CallError::CALL_ERROR_INVALID_ARGUMENT: {
						String expected_type_name;
						if (err.argument < function_info.arguments.size()) {
							expected_type_name = type_from_property(function_info.arguments[err.argument], true).to_string();
						} else {
							expected_type_name = Variant::get_type_name((Variant::Type)err.expected);
						}
						push_error(vformat(R"*(Invalid argument for "%s()" function: argument %d should be "%s" but is "%s".)*", function_name, err.argument + 1,
										   expected_type_name, p_call->arguments[err.argument]->get_datatype().to_string()),
								p_call->arguments[err.argument]);
					} break;
					case Callable::CallError::CALL_ERROR_INVALID_METHOD:
						push_error(vformat(R"(Invalid call for function "%s".)", function_name), p_call);
						break;
					case Callable::CallError::CALL_ERROR_TOO_MANY_ARGUMENTS: