[Python-checkins] cpython: whatsnew: LOAD_CLASSDEREF, -X showrefcount

[r.david.murray]

http://hg.python.org/cpython/rev/b18d4b6ccdc7
changeset:   89172:b18d4b6ccdc7
user:        R David Murray <rdmurray at bitdance.com>
date:        Wed Feb 12 13:00:36 2014 -0500
summary:
  whatsnew: LOAD_CLASSDEREF, -X showrefcount

files:
  Doc/reference/datamodel.rst |  2 ++
  Doc/whatsnew/3.4.rst        |  8 ++++++++
  2 files changed, 10 insertions(+), 0 deletions(-)


diff --git a/Doc/reference/datamodel.rst b/Doc/reference/datamodel.rst
--- a/Doc/reference/datamodel.rst
+++ b/Doc/reference/datamodel.rst
@@ -1647,6 +1647,8 @@
 that criterion, then the class definition will fail with ``TypeError``.
 
 
+.. _prepare:
+
 Preparing the class namespace
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
diff --git a/Doc/whatsnew/3.4.rst b/Doc/whatsnew/3.4.rst
--- a/Doc/whatsnew/3.4.rst
+++ b/Doc/whatsnew/3.4.rst
@@ -1455,6 +1455,10 @@
   now works correctly (previously it silently returned the first python
   module in the file).  (Contributed by Václav Šmilauer in :issue:`16421`.)
 
+* A new opcode, :opcode:`LOAD_CLASSDEREF`, has been added to fix a bug in the
+  loading of free variables in class bodies that could be triggered by certain
+  uses of :ref:`__prepare__ <prepare>`.  (Contributed by Benjamin Peterson in
+  :issue:`17853`.)
 
 
 Significant Optimizations
@@ -1650,6 +1654,10 @@
   how :envvar:`PATH` works.  The behavior now conforms to the posix convention
   for :envvar:`PATH`.
 
+* The [X refs, Y blocks] output of a debug (``--with-pydebug``) build of the
+  CPython interpreter is now off by default.  It can be re-enabled using the
+  ``-X showrefcount`` option. (Contributed by Ezio Melotti in :issue:`17323`.)
+
 
 Changes in the Python API
 -------------------------

-- 
Repository URL: http://hg.python.org/cpython