Issue #9738: PyUnicode_FromFormat() and PyErr_Format() raise an error on
a non-ASCII byte in the format string.
Document also the encoding.
diff --git a/Include/pyerrors.h b/Include/pyerrors.h
index 1eee16d..243bc01 100644
--- a/Include/pyerrors.h
+++ b/Include/pyerrors.h
@@ -183,7 +183,11 @@
PyObject *, const Py_UNICODE *);
#endif /* MS_WINDOWS */
-PyAPI_FUNC(PyObject *) PyErr_Format(PyObject *, const char *, ...);
+PyAPI_FUNC(PyObject *) PyErr_Format(
+ PyObject *exception,
+ const char *format, /* ASCII-encoded string */
+ ...
+ );
#ifdef MS_WINDOWS
PyAPI_FUNC(PyObject *) PyErr_SetFromWindowsErrWithFilenameObject(