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// callproc.c
static PyObject *format_error(PyObject *self, PyObject *args)
{
 PyObject *result;
 wchar_t *lpMsgBuf;
 DWORD code = 0;
 if (!PyArg_ParseTuple(args, "|i:FormatError", &code)) 
 ^ Here the format string should be "|I:FormatError"
 return NULL;
 if (code == 0)
 code = GetLastError();
 lpMsgBuf = FormatError(code);
 if (lpMsgBuf) {
 result = PyUnicode_FromWideChar(lpMsgBuf, wcslen(lpMsgBuf));
 LocalFree(lpMsgBuf);
 } else {
 result = PyUnicode_FromString("<no description>");
 }
 return result;
}