Function OSSingleton.exitCode
The exit code passed to the OS when the main loop exits. By convention, an exit code of 0 indicates success whereas a non-zero exit code indicates an error. For portability reasons, the exit code should be set between 0 and 125 (inclusive).
Note: This value will be ignored if using SceneTree with an exit_code argument passed.
long exitCode() nothrow @property @nogc;
void exitCode
(
long v
) nothrow @property @nogc;