proc BlockingIOError(myerrno: cint; strerr: string; filename = 0;
                     winerror: cint = 0; filename2 = ""): ref PyOSError {.
    ...raises: [], tags: [], forbids: [].}

proc newBlockingIOError(myerrno: cint; strerr: string; filename = 0;
                        winerror: cint = 0; filename2 = ""): ref PyOSError {.
    ...raises: [], tags: [], forbids: [].}

proc newPyOSError(myerrno: cint; strerr: string; filename = "";
                  winerror: cint = 0; filename2 = ""): ref PyOSError {.
    ...raises: [], tags: [], forbids: [].}

proc PyOSError(myerrno: cint; strerr: string; filename = ""; winerror: cint = 0;
               filename2 = ""): ref PyOSError {....raises: [], tags: [],
    forbids: [].}