Cleaner struct layout.

Author: gpshead

Include/cpython/pyerrors.h

@@ -8,9 +8,9 @@
 
 /* PyException_HEAD defines the initial segment of every exception class. */
 #define PyException_HEAD PyObject_HEAD PyObject *dict;\
-             PyObject *args; PyObject *notes;\
-             PyTime_t timestamp_ns; PyObject *traceback;\
+             PyObject *args; PyObject *notes; PyObject *traceback;\
              PyObject *context; PyObject *cause;\
+             PyTime_t timestamp_ns;\
              char suppress_context;
 
 typedef struct {

Lib/test/test_sys.py

@@ -1595,13 +1595,13 @@ def inner():
         class C(object): pass
         check(C.__dict__, size('P'))
         # BaseException
-        check(BaseException(), size('3Pq3Pb'))
+        check(BaseException(), size('6Pqb'))
         # UnicodeEncodeError
-        check(UnicodeEncodeError("", "", 0, 0, ""), size('3Pq3Pb 2P2nP'))
+        check(UnicodeEncodeError("", "", 0, 0, ""), size('6Pqb 2P2nP'))
         # UnicodeDecodeError
-        check(UnicodeDecodeError("", b"", 0, 0, ""), size('3Pq3Pb 2P2nP'))
+        check(UnicodeDecodeError("", b"", 0, 0, ""), size('6Pqb 2P2nP'))
         # UnicodeTranslateError
-        check(UnicodeTranslateError("", 0, 1, ""), size('3Pq3Pb 2P2nP'))
+        check(UnicodeTranslateError("", 0, 1, ""), size('6Pqb 2P2nP'))
         # ellipses
         check(Ellipsis, size(''))
         # EncodingMap