Update cython to 3.0.11

[pyup-bot]

This PR updates Cython from 0.24 to 3.0.11.

Changelog

3.0.11

===================

Features added
--------------

* The C++11 ``emplace*`` methods were added to ``libcpp.deque``.
Patch by Somin An.  (Github issue :issue:`6159`)

Bugs fixed
----------

* The exception check value of functions declared in pxd files was not always applied in 3.0.10.
(Github issue :issue:`6122`)

* A crash on exception deallocations was fixed.
(Github issue :issue:`6022`)

* A crash was fixed when assigning a zero-length slice to a memoryview.
Patch by Michael Man.  (Github issue :issue:`6227`)

* ``libcpp.optional.value()`` could crash if it raised a C++ exception.
Patch by Alexander Condello.  (Github issue :issue:`6190`)

* The return type of ``str()`` was mishandled, leading to crashes with ``language_level=3``.
(Github issue :issue:`6166`)

* ``bytes.startswith/endswith()`` failed for non-bytes substrings (e.g. ``bytearray``).
(Github issue :issue:`6168`)

* Fused ctuples crashed Cython.
(Github issue :issue:`6068`)

* A compiler crash was fixed when using extension types in fused types.
(Github issue :issue:`6204`)

* The module cleanup code was incorrect for globally defined memory view slices.
(Github issue :issue:`6276`)

* Some adaptations were made to enable compilation in Python 3.13.
(Github issues :issue:`5997`, :issue:`6182`, :issue:`6251`)

3.0.10

===================

Bugs fixed
----------

* Cython generated incorrect self-casts when directly calling final methods of subtypes.
Patch by Lisandro Dalcin.  (Github issue :issue:`2747`)

* Internal C names generated from C function signatures could become too long for MSVC.
(Github issue :issue:`6052`)

* The ``noexcept`` warnings could be misleading in some cases.
Patch by Gonzalo Tornaría.  (Github issue :issue:`6087`)

* The ``cython.ufunc`` implementation could generate incomplete C code.
(Github issue :issue:`6064`)

* The ``libcpp.complex`` declarations could result in incorrect C++ code.
Patch by Raffi Enficiaud.  (Github issue :issue:`6037`)

* Several tests were adapted to work with both NumPy 1.x and 2.0.
Patch by Matti Picus.  (Github issues :issue:`6076`, :issue:`6100`)

* C compiler warnings when the freelist implementation is disabled (e.g. on PyPy) were fixed.
It can now be disabled explicitly with the C macro guard ``CYTHON_USE_FREELISTS=0``.
(Github issue :issue:`6099`)

* Some C macro guards for feature flags were missing from the NOGIL Python configuration.

* Some recently added builtins were unconditionally looked up at module import time
(if used by user code) that weren't available on all Python versions and could thus
fail the import.

* A performance hint regarding exported pxd declarations was improved.
(Github issue :issue:`6001`)

3.0.9

==================

Features added
--------------

* Assigning ``const`` values to non-const variables now issues a warning.
(Github issue :issue:`5639`)

* Using ``noexcept`` on a function returning Python objects now issues a warning.
(Github issue :issue:`5661`)

* Some C-API usage was updated for the upcoming CPython 3.13.
Patches by Victor Stinner et al.  (Github issues :issue:`6003`, :issue:`6020`)

* The deprecated ``Py_UNICODE`` type is no longer used, unless required by user code.
(Github issue :issue:`5982`)

* ``std::string.replace()`` declarations were added to libcpp.string.
Patch by Kieran Geary.  (Github issue :issue:`6037`)

Bugs fixed
----------

* Cython generates incorrect (but harmless) self-casts when directly calling
final methods of subtypes.  Lacking a better solution, the errors that recent
gcc versions produce have been silenced for the time being.
Original patch by Michał Górny.  (Github issue :issue:`2747`)

* Unused variable warnings about clineno were fixed when C lines in tracebacks are disabled.
(Github issue :issue:`6035`)

* Subclass deallocation of extern classes could crash if the base class uses GC.
Original patch by Jason Fried.  (Github issue :issue:`5971`)

* Type checks for Python ``memoryview`` could use an invalid C function.
Patch by Xenia Lu.  (Github issue :issue:`5988`)

* Calling final fused functions could generate invalid C code.
(Github issue :issue:`5989`)

* Declaring extern enums multiple times could generate invalid C code.
(Github issue :issue:`5905`)

* ``pyximport`` used relative paths incorrectly.
Patch by Stefano Rivera.  (Github issue :issue:`5957`)

* Running Cython with globbing characters (``[]*?``) in the module search path could fail.
Patch by eewanco.  (Github issue :issue:`5942`)

* Literal strings that include braces could change the C code indentation.

Other changes
-------------

* The "enum class not importable" warning is now only issued once per enum type.
(Github issue :issue:`5941`)

3.0.8

==================

Bugs fixed
----------

* Using ``const`` together with defined fused types could fail to compile.
(Github issue :issue:`5230`)

* A "use after free" bug was fixed in parallel sections.
(Github issue :issue:`5922`)

* Several types were not available as ``cython.*`` types in pure Python code.

* The generated code is now correct C89 again, removing some C++ style ``//`` comments
and C99-style declaration-after-code code ordering.  This is still relevant for some
ols C compilers, specifically ones that match old Python 2.7 installations.

3.0.7

==================

Bugs fixed
----------

* In the iterator of generator expressions, ``await`` and ``yield`` were not correctly analysed.
(Github issue :issue:`5851`)

* ``cpdef`` enums with the same name cimported from different modules could lead to
invalid C code.
(Github issue :issue:`5887`)

* Some declarations in ``cpython.unicode`` were fixed and extended.
(Github issue :issue:`5902`)

* Compiling fused types used in pxd files could crash Cython in Python 3.11+.
(Github issues :issue:`5894`,  :issue:`5588`)

* Source files with non-ASCII file names could crash Cython.
(Github issue :issue:`5873`)

* Includes all bug-fixes and features from the 0.29 maintenance branch
up to the :ref:`0.29.37` release.

3.0.6

==================

Features added
--------------

* Fused def function dispatch is a bit faster.

* Declarations for the ``wchar`` PyUnicode API were added.
(Github issue :issue:`5836`)

* The Python "nogil" fork is now also detected with the new ``Py_GIL_DISABLED`` macro.
Patch by Hugo van Kemenade.  (Github issue :issue:`5852`)

Bugs fixed
----------

* Comparing dataclasses could give different results than Python.
(Github issue :issue:`5857`)

* ``float(std::string)`` generated invalid C code.
(Github issue :issue:`5818`)

* Using ``cpdef`` functions with ``cimport_from_pyx`` failed.
(Github issue :issue:`5795`)

* A crash was fixed when string-formatting a Python value fails.
(Github issue :issue:`5787`)

* On item access, Cython could try the sequence protocol before the mapping protocol
in some cases if an object supports both.
(Github issue :issue:`5776`)

* A C compiler warning was resolved.
(Github issue :issue:`5794`)

* Complex numbers failed to compile in MSVC with C11.
Patch by Lysandros Nikolaou.  (Github issue :issue:`5809`)

* Some issues with the Limited API and with PyPy were resolved.
(Github issues :issue:`5695`, :issue:`5696`)

* A C++ issue in Python 3.13 was resolved.
(Github issue :issue:`5790`)

* Several directives are now also available (as no-ops) in Python code.
(Github issue :issue:`5803`)

* An error message was corrected.
Patch by Mads Ynddal.  (Github issue :issue:`5805`)

3.0.5

==================

Features added
--------------

* Preliminary support for CPython 3.13a1 was added to allow early testing.
(Github issue :issue:`5767`)

Bugs fixed
----------

* A compiler crash was fixed.
(Github issue :issue:`5771`)

* A typo in the ``always_allow_keywords`` directive for Python code was fixed.
Patch by lk-1984.  (Github issue :issue:`5772`)

* Some C compiler warnings were resolved.
Patch by Pierre Jolivet.  (Github issue :issue:`5780`)

3.0.4

==================

Features added
--------------

* A new compiler directive ``show_performance_hints`` was added to disable the
newly added performance hint output.
(Github issue :issue:`5748`)

Bugs fixed
----------

* cythonize` required ``distutils`` even for operations that did not build binaries.
(Github issue :issue:`5751`)

* A regression in 3.0.3 was fixed that prevented calling inline functions
from another inline function in ``.pxd`` files.
(Github issue :issue:`5748`)

* Some C compiler warnings were resolved.
Patch by Pierre Jolivet.  (Github issue :issue:`5756`)

3.0.3

==================

Features added
--------------

* More warnings were added to help users migrate and avoid bugs.
(Github issue :issue:`5650`)

* A warning-like category for performance hints was added that bypasses ``-Werror``.
(Github issue :issue:`5673`)

* FastGIL now uses standard ``thread_local`` in C++.
(Github issue :issue:`5640`)

* ``reference_wrapper`` was added to ``libcpp.functional``.
Patch by Vyas Ramasubramani.  (Github issue :issue:`5671`)

* The ``cythonize`` command now supports the ``--cplus`` option known from the ``cython`` command.
(Github issue :issue:`5736`)

Bugs fixed
----------

* Performance regressions where the GIL was needlessly acquired were fixed.
(Github issues :issue:`5670`, :issue:`5700`)

* A reference leak for exceptions in Python 3.12 was resolved.
Patch by Eric Johnson.  (Github issue :issue:`5724`)

* ``fastcall`` calls with keyword arguments generated incorrect C code.
(Github issue :issue:`5665`)

* Assigning the type converted result of a conditional (if-else) expression
to ``int`` or ``bool`` variables could lead to incorrect C code.
(Github issue :issue:`5731`)

* Early (unlikely) failures in Python function wrappers no longer set a
traceback in order to simplify the C code flow.  Being mostly memory
allocation errors, they probably would never have created a traceback anyway.
(Github issue :issue:`5681`)

* Relative cimports from packages with ``__init__.py`` files could fail.
(Github issue :issue:`5715`)

* Several issues with the Limited API support were resolved.
(Github issues :issue:`5641`, :issue:`5648`, :issue:`5689`)

* The code generated for special-casing both Cython functions and PyCFunctions was cleaned up
to avoid calling C-API functions that were not meant for the other type respectively.
This could previously trigger assertions in CPython debug builds and now also plays better
with the Limited API.
(Github issues :issue:`4804`, :issue:`5739`)

* Fix some C compiler warnings.
Patches by Ralf Gommers, Oleksandr Pavlyk, Sebastian Koslowski et al.
(Github issues :issue:`5651`, :issue:`5663`, :issue:`5668`, :issue:`5717`, :issue:`5726`, :issue:`5734`)

* Generating gdb debugging information failed when using generator expressions.
Patch by Oleksandr Pavlyk.  (Github issue :issue:`5552`)

* Passing a ``setuptools.Extension`` into ``cythonize()`` instead of a
``distutils.Extension`` could make it miss the matching extensions.

* ``cython -M`` needlessly required ``distutils``, which made it fail in Python 3.12.
(Github issue :issue:`5681`)

Other changes
-------------

* The visible deprecation warning for ``DEF`` was removed again since it proved
difficult for some users to migrate away from it.  The statement is still
meant to be removed at some point (and thus, like ``IF``, should not be
used in new code), but the time for sunset is probably not around the corner.
(Github issue :issue:`4310`)

* The ``np_pythran`` option raise a ``DeprecationWarning`` if it receives other values
than ``True`` and ``False``.  This will eventually be disallowed (in line with all
other boolean options).

3.0.2

==================

Bugs fixed
----------

* Using ``None`` as default value for arguments annotated as ``int`` could crash Cython.
(Github issue :issue:`5643`)

* Default values of fused types that include ``complex`` could generate invalid C code
with ``-DCYTHON_CCOMPLEX=0``.
(Github issue :issue:`5644`)

* Using C++ enum class types in extension type method signatures could generate invalid C code.
(Github issue :issue:`5637`)

3.0.1

==================

Features added
--------------

* The error messages regarding exception declarations were improved in order to give
better help about possible reasons and fixes.
(Github issue :issue:`5547`)

Bugs fixed
----------

* Memory view types in Python argument annotations no longer accept ``None``.  They now
require an explicit ``Optional[]`` or a ``None`` default value in order to allow ``None``
to be passed.  This was an oversight in the 3.0.0 release and is a BACKWARDS INCOMPATIBLE
change.  However, since it only applies to code using Python syntax, it probably only
applies to newly written code that was written for Cython 3.0 and can easily be adapted.
In most cases, we expect that this change will avoid bugs in user code rather than
produce problems.
(Github issue :issue:`5612`)

* ``nogil`` functions using parallel code could freeze when called with the GIL held.
(Github issues :issue:`5564`, :issue:`5573`)

* Relative cimports could end up searching globally and find the same package installed
elsewhere, potentially in another version.
(Github issue :issue:`5511`)

* Attribute lookups on known standard library modules could accidentally search
in the module namespace instead.
(Github issue :issue:`5536`)

* Using constructed C++ default arguments could generate invalid C++ code.
(Github issue :issue:`5553`)

* ``libcpp.memory.make_unique()`` was lacking C++ exception handling.
(Github issue :issue:`5560`)

* Some non-public and deprecated CAPI usages were replaced by public
(and thus more future proof) API code.

* Many issues with the Limited API support were resolved.
Patches by Lisandro Dalcin et al.
(Github issues :issue:`5549`, :issue:`5550`, :issue:`5556`, :issue:`5605`, :issue:`5617`)

* Some C compiler warnings were resolved.
Patches by Matti Picus et al.  (Github issues :issue:`5557`, :issue:`5555`)

* Large Python integers are now stored in hex instead of decimal strings to work around
security limits in Python and generally speed up their Python object creation.

* ``NULL`` could not be used as default for fused type pointer arguments.
(Github issue :issue:`5554`)

* C functions that return pointer types now return ``NULL`` as default exception value.
Previously, calling code wasn't aware of this and always tested for raised exceptions.
(Github issue :issue:`5554`)

* Untyped literal default arguments in fused functions could generate invalid C code.
(Github issue :issue:`5614`)

* C variables declared as ``const`` could generate invalid C code when used in closures,
generator expressions, ctuples, etc.
(Github issues :issue:`5558`,  :issue:`5333`)

* Enums could not refer to previously defined enums in their definition.
(Github issue :issue:`5602`)

* The Python conversion code for anonymous C enums conflicted with regular int conversion.
(Github issue :issue:`5623`)

* Using memory views for property methods (and other special methods) could lead to
refcounting problems.
(Github issue :issue:`5571`)

* Star-imports could generate code that tried to assign to constant C macros like
``PY_SSIZE_T_MAX`` and ``PY_SSIZE_T_MIN``.
Patch by Philipp Wagner.  (Github issue :issue:`5562`)

* ``CYTHON_USE_TYPE_SPECS`` can now be (explicitly) enabled in PyPy.

* The template parameter "delimeters" in the Tempita ``Template`` class was corrected
to "delimiters".  The old spelling is still available in the main template API but
now issues a ``DeprecationWarning``.
(Github issue :issue:`5608`)

* The ``cython --version`` output is now  less likely to reach both stdout and stderr.
Patch by Eli Schwartz.  (Github issue :issue:`5504`)

* The sdist was missing the `Shadow.pyi` stub file.

3.0.0

==========================

Features added
--------------

* Cython functions now use the `PEP-590`_ vectorcall protocol in Py3.7+.
Patch by Jeroen Demeyer.  (Github issue :issue:`2263`)

* Unicode identifiers are supported in Cython code (`PEP-3131`_).
Patch by David Woods.  (Github issue :issue:`2601`)

* Unicode module names and imports are supported.
Patch by David Woods.  (Github issue :issue:`3119`)

* Annotations are no longer parsed, keeping them as strings following `PEP-563`_.
Patch by David Woods.  (Github issue :issue:`3285`)

* Preliminary support for the CPython's ``Py_LIMITED_API`` (stable ABI) is
available by setting the  ``CYTHON_LIMITED_API`` C macro.  Note that the
support is currently in an early stage and many features do not yet work.
You currently still have to define ``Py_LIMITED_API`` externally in order
to restrict the API usage.  This will change when the feature stabilises.
Patches by Eddie Elizondo and David Woods.  (Github issues :issue:`3223`,
:issue:`3311`, :issue:`3501`)

* The dispatch to fused functions is now linear in the number of arguments,
which makes it much faster, often 2x or more, and several times faster for
larger fused types with many specialisations.
Patch by will-ca.  (Github issue :issue:`1385`)

* ``with gil/nogil`` statements can be conditional based on compile-time
constants, e.g. fused type checks.
Patch by Noam Hershtig.  (Github issue :issue:`2579`)

* ``const`` can be used together with fused types.
Patch by Thomas Vincent.  (Github issue :issue:`1772`)

* Reimports of already imported modules are substantially faster.
(Github issue :issue:`2854`)

* Positional-only arguments are supported in Python functions (`PEP-570`_).
Patch by Josh Tobin.  (Github issue :issue:`2915`)

* The ``volatile`` C modifier is supported in Cython code.
Patch by Jeroen Demeyer.  (Github issue :issue:`1667`)

* ``cython.trashcan(True)`` can be used on an extension type to enable the
CPython :ref:`trashcan`. This allows deallocating deeply recursive objects
without overflowing the stack. Patch by Jeroen Demeyer.  (Github issue :issue:`2842`)

* Inlined properties can be defined for external extension types.
Patch by Matti Picus. (Github issue :issue:`2640`, redone later in :issue:`3571`)

* The ``str()`` builtin now calls ``PyObject_Str()`` instead of going
through a Python call.
Patch by William Ayd.  (Github issue :issue:`3279`)

* String concatenation can now happen in place if possible, by extending the
existing string rather than always creating a new one.
Patch by David Woods.  (Github issue :issue:`3453`)

* Multiplication of Python numbers with small constant integers is faster.
(Github issue :issue:`2808`)

* Some list copying is avoided internally when a new list needs to be created
but we already have a fresh one.
(Github issue :issue:`3494`)

* Extension types that do not need their own ``tp_new`` implementation (because
they have no object attributes etc.) directly inherit the implementation of
their parent type if possible.
(Github issue :issue:`1555`)

* The attributes ``gen.gi_frame`` and ``coro.cr_frame`` of Cython compiled
generators and coroutines now return an actual frame object for introspection.
(Github issue :issue:`2306`)

* Several declarations in ``cpython.*``, ``libc.*`` and ``libcpp.*`` were added.
Patches by Jeroen Demeyer, Matthew Edwards, Chris Gyurgyik, Jerome Kieffer
and Zackery Spytz.
(Github issues :issue:`3468`, :issue:`3332`, :issue:`3202`, :issue:`3188`,
:issue:`3179`, :issue:`2891`, :issue:`2826`, :issue:`2713`)

* Deprecated NumPy API usages were removed from ``numpy.pxd``.
Patch by Matti Picus.  (Github issue :issue:`3365`)

* ``cython.inline()`` now sets the ``NPY_NO_DEPRECATED_API=NPY_1_7_API_VERSION``
C macro automatically when ``numpy`` is imported in the code, to avoid C compiler
warnings about deprecated NumPy C-API usage.

* The builtin ``abs()`` function can now be used on C numbers in nogil code.
Patch by Elliott Sales de Andrade.  (Github issue :issue:`2748`)

* `PEP-479`_ (``generator_stop``) is now enabled by default with language level 3.
(Github issue :issue:`2580`)

* The ``cython.view.array`` type supports inheritance.
Patch by David Woods.  (Github issue :issue:`3413`)

* Code annotation accepts a new debugging argument ``--annotate-fullc`` that
will include the complete syntax highlighted C file in the HTML output.
(Github issue :issue:`2855`)

* ``--no-capture`` added to ``runtests.py`` to prevent stdout/stderr capturing
during srctree tests.
Patch by Matti Picus.  (Github issue :issue:`2701`)

* ``--no-docstrings`` option added to ``cythonize`` script.
Original patch by mo-han.  (Github issue :issue:`2889`)

* ``cygdb`` gives better error messages when it fails to initialise the
Python runtime support in gdb.
Patch by Volker Weissmann.  (Github issue :issue:`3489`)

* The Pythran ``shape`` attribute is supported.
Patch by Serge Guelton.  (Github issue :issue:`3307`)

Bugs fixed
----------

* The unicode methods ``.upper()``, ``.lower()`` and ``.title()`` were
incorrectly optimised for single character input values and only returned
the first character if multiple characters should have been returned.
They now use the original Python methods again.

* Fused argument types were not correctly handled in type annotations and
``cython.locals()``.
Patch by David Woods.  (Github issues :issue:`3391`, :issue:`3142`)

* Diverging from the usual behaviour, ``len(memoryview)``, ``len(char*)``
and ``len(Py_UNICODE*)`` returned an unsigned ``size_t`` value.  They now
return a signed ``Py_ssize_t``, like other usages of ``len()``.

* Nested dict literals in function call kwargs could incorrectly raise an
error about duplicate keyword arguments, which are allowed when passing
them from dict literals.
(Github issue :issue:`2963`)

* Item access (subscripting) with integer indices/keys always tried the
Sequence protocol before the Mapping protocol, which diverged from Python
semantics.  It now passes through the Mapping protocol first when supported.
(Github issue :issue:`1807`)

* Name lookups in class bodies no longer go through an attribute lookup.
Patch by Jeroen Demeyer.  (Github issue :issue:`3100`)

* Broadcast assignments to a multi-dimensional memory view slice could end
up in the wrong places when the underlying memory view is known to be
contiguous but the slice is not.
(Github issue :issue:`2941`)

* Pickling unbound methods of Python classes failed.
Patch by Pierre Glaser.  (Github issue :issue:`2972`)

* The ``Py_hash_t`` type failed to accept arbitrary "index" values.
(Github issue :issue:`2752`)

* The first function line number of functions with decorators pointed to the
signature line and not the first decorator line, as in Python.
Patch by Felix Kohlgrüber.  (Github issue :issue:`2536`)

* Constant integer expressions that used a negative exponent were evaluated
as integer 0 instead of the expected float value.
Patch by Kryštof Pilnáček.  (Github issue :issue:`2133`)

* The ``cython.declare()`` and ``cython.cast()`` functions could fail in pure mode.
Patch by Dmitry Shesterkin.  (Github issue :issue:`3244`)

* ``__doc__`` was not available inside of the class body during class creation.
(Github issue :issue:`1635`)

* Setting ``language_level=2`` in a file did not work if ``language_level=3``
was enabled globally before.
Patch by Jeroen Demeyer.  (Github issue :issue:`2791`)

* ``__init__.pyx`` files were not always considered as package indicators.
(Github issue :issue:`2665`)

* Compiling package ``__init__`` files could fail under Windows due to an
undefined export symbol.  (Github issue :issue:`2968`)

* A C compiler cast warning was resolved.
Patch by Michael Buesch.  (Github issue :issue:`2775`)

* Binding staticmethods of Cython functions were not behaving like Python methods.
Patch by Jeroen Demeyer.  (Github issue :issue:`3106`, :issue:`3102`)

* Memoryviews failed to compile when the ``cache_builtins`` feature was disabled.
Patch by David Woods.  (Github issue :issue:`3406`)

Other changes
-------------

* The default language level was changed to ``3str``, i.e. Python 3 semantics,
but with ``str`` literals (also in Python 2.7).  This is a backwards incompatible
change from the previous default of Python 2 semantics.  The previous behaviour
is available through the directive ``language_level=2``.
(Github issue :issue:`2565`)

* Cython no longer generates ``__qualname__`` attributes for classes in Python
2.x since they are problematic there and not correctly maintained for subclasses.
Patch by Jeroen Demeyer.  (Github issue :issue:`2772`)

* Source file fingerprinting now uses SHA-1 instead of MD5 since the latter
tends to be slower and less widely supported these days.
(Github issue :issue:`2790`)

* The long deprecated include files ``python_*``, ``stdio``, ``stdlib`` and
``stl`` in ``Cython/Includes/Deprecated/`` were removed.  Use the ``libc.*``
and ``cpython.*`` pxd modules instead.
Patch by Jeroen Demeyer.  (Github issue :issue:`2904`)

* The search order for include files was changed. Previously it was
``include_directories``, ``Cython/Includes``, ``sys.path``. Now it is
``include_directories``, ``sys.path``, ``Cython/Includes``. This was done to
allow third-party ``*.pxd`` files to override the ones in Cython.
Patch by Matti Picus.  (Github issue :issue:`2905`)

* The command line parser was rewritten and modernised using ``argparse``.
Patch by Egor Dranischnikow.  (Github issue :issue:`2952`, :issue:`3001`)

* Dotted filenames for qualified module names (``pkg.mod.pyx``) are deprecated.
Use the normal Python package directory layout instead.
(Github issue :issue:`2686`)

* Binary Linux wheels now follow the manylinux2010 standard.
Patch by Alexey Stepanov.  (Github issue :issue:`3355`)

* Support for Python 2.6 was removed.

.. _`PEP-560`: https://www.python.org/dev/peps/pep-0560
.. _`PEP-570`: https://www.python.org/dev/peps/pep-0570
.. _`PEP-487`: https://www.python.org/dev/peps/pep-0487
.. _`PEP-590`: https://www.python.org/dev/peps/pep-0590
.. _`PEP-3131`: https://www.python.org/dev/peps/pep-3131
.. _`PEP-563`: https://www.python.org/dev/peps/pep-0563
.. _`PEP-479`: https://www.python.org/dev/peps/pep-0479

0.29.37

====================

Bugs fixed
----------

* Fix a potential crash while cleaning up subtypes of externally imported extension
types when terminating Python.  This was introduced in Cython 0.29.35.

* Fix a ``complex`` related compile error on Windows.
(Github issue :issue:`5512`)

* Compiling fused types used in pxd files could crash Cython in Python 3.11+.
(Github issues :issue:`5894`, :issue:`5588`)

* ``cythonize`` failed to consider the ``CYTHON_FORCE_REGEN`` env variable.
Patch by Harmen Stoppels.  (Github issue :issue:`5712`)

0.29.36

====================

Bugs fixed
----------

* Async generators lost their return value in PyPy.
(Github issue :issue:`5465`)

* The outdated C macro ``_PyGC_FINALIZED()`` is no longer used in Py3.9+.

* The deprecated ``Py_OptimizeFlag`` is no longer used in Python 3.9+.
(Github issue :issue:`5343`)

* Using the global ``__debug__`` variable but not assertions could lead to compile errors.

* The broken HTML template support was removed from Tempita.
(Github issue :issue:`3309`)

0.29.35

====================

Bugs fixed
----------

* A garbage collection enabled subtype of a non-GC extension type could call into the
deallocation function of the super type with GC tracking enabled.  This could lead
to crashes during deallocation if GC was triggered on the type at the same time.
(Github issue :issue:`5432`)

* Some C compile failures and crashes in CPython 3.12 were resolved.

* ``except + nogil`` was syntactically not allowed.
``except +nogil`` (i.e. defining a C++ exception handling function called ``nogil``)
is now disallowed to prevent typos.
(Github issue :issue:`5430`)

* A C compile failure in PyPy 3.10 was resolved.
Patch by Matti Picus.  (Github issue :issue:`5408`)

* Cython modules now use PEP-489 multi-phase init by default in PyPy 3.9 and later.
Original patch by Matti Picus.  (Github issue :issue:`5413`)

* API header files generated by different Cython versions can now be included in the
same C file.
(Github issue :issue:`5383`)

* Function signatures containing a type like `tuple[()]` could not be printed.
Patch by Lisandro Dalcin.  (Github issue :issue:`5355`)

0.29.34

====================

Bugs fixed
----------

* A reference leak of the for-loop list/tuple iterable was resolved if the for-loop's
``else:`` branch executes a ``break`` for an outer loop.
(Github issue :issue:`5347`)

* Some C compile failures in CPython 3.12 were resolved.

* Some old usages of the deprecated Python ``imp`` module were replaced with ``importlib``.
Patch by Matúš Valo.  (Github issue :issue:`5300`)

* Some issues with ``depfile`` generation were resolved.
Patches by Eli Schwartz.  (Github issues :issue:`5279`, :issue:`5291`)

0.29.33

====================

Features added
--------------

* The ``cythonize`` and ``cython`` commands have a new option ``-M`` / ``--depfile``
to generate ``.dep`` dependency files for the compilation unit.  This can be used
by external build tools to track these dependencies.
The ``cythonize`` option was already available in Cython :ref:`0.29.27`.
Patches by Evgeni Burovski and Eli Schwartz.  (Github issue :issue:`1214`)

Bugs fixed
----------

* ``const`` fused types could not be used with memory views.
Patch by Thomas Vincent.  (Github issue :issue:`1772`)

* ``wstr`` usage was removed in Python 3.12 and later (PEP-623).
(Github issue :issue:`5145`)

* A type check assertion for Cython functions failed in debug Python builds.
(Github issue :issue:`5031`)

* Fixed various compiler warnings.
Patches by Lisandro Dalcin et al.  (Github issues :issue:`4948`, :issue:`5086`)

* Fixed error when calculating complex powers of negative numbers.
(Github issue :issue:`5014`)

* Corrected a small mis-formatting of exception messages on Python 2.
(Github issue :issue:`5018`)

* The ``PyUnicode_AsUTF8AndSize()`` C-API function was missing from the CPython declarations.
(Github issue :issue:`5163`)

* A performance problem in the compiler was resolved when nesting conditional expressions.
(Github issue :issue:`5197`)

* Test suite problems with recent NumPy and CPython versions were resolved.
(Github issues :issue:`5183`, :issue:`5190`)

Other changes
-------------

* The undocumented, untested and apparently useless syntax
``from somemodule cimport class/struct/union somename`` was deprecated
in anticipation of its removal in Cython 3.  The type
modifier is not needed here and a plain ``cimport`` of the name will do.
(Github issue :issue:`4905`)

* Properly disable generation of descriptor docstrings on PyPy since they cause crashes.
It was previously disabled, but only accidentally via a typo.
Patch by Matti Picus.  (Github issue :issue:`5083`)

* The ``cpow`` directive of Cython 3.0 is available as a no-op.
(Github issue :issue:`5016`)

0.29.32

====================

Bugs fixed
----------

* Revert "Using memoryview typed arguments in inner functions is now rejected as unsupported."
Patch by David Woods.  (Github issue :issue:`4798`)

* ``from module import *`` failed in 0.29.31 when using memoryviews.
Patch by David Woods.  (Github issue :issue:`4927`)

0.29.31

====================

Features added
--------------

* A new argument ``--module-name`` was added to the ``cython`` command to
provide the (one) exact target module name from the command line.
Patch by Matthew Brett and h-vetinari.  (Github issue :issue:`4906`)

* A new keyword ``noexcept`` was added for forward compatibility with Cython 3.
Patch by David Woods.  (Github issue :issue:`4903`)

Bugs fixed
----------

* Use ``importlib.util.find_spec()`` instead of the deprecated ``importlib.find_loader()``
function when setting up the package path at import-time.
Patch by Matti Picus.  (Github issue :issue:`4764`)

* Require the C compiler to support the two-arg form of ``va_start``
on Python 3.10 and higher.
Patch by Thomas Caswell.  (Github issue :issue:`4820`)

* Make ``fused_type`` subscriptable in Shadow.py.
Patch by Pfebrer.  (Github issue :issue:`4842`)

* Fix the incorrect code generation of the target type in ``bytearray`` loops.
Patch by Kenrick Everett.  (Github issue :issue:`4108`)

* Atomic refcounts for memoryviews were not used on some GCC versions by accident.
Patch by Sam Gross.  (Github issue :issue:`4915`)

* Silence some GCC ``-Wconversion`` warnings in C utility code.
Patch by Lisandro Dalcin.  (Github issue :issue:`4854`)

* Tuple multiplication was ignored in expressions such as ``[*(1,) * 2]``.
Patch by David Woods.  (Github issue :issue:`4864`)

* Calling ``append`` methods on extension types could fail to find the method
in some cases.
Patch by David Woods.  (Github issue :issue:`4828`)

* Ensure that object buffers (e.g. ``ndarray[object, ndim=1]``) containing
``NULL``  pointers are safe to use, returning ``None`` instead of the ``NULL``
pointer.
Patch by Sebastian Berg.  (Github issue :issue:`4859`)

* Using memoryview typed arguments in inner functions is now rejected as unsupported.
Patch by David Woods.  (Github issue :issue:`4798`)

* Compilation could fail on systems (e.g. FIPS) that block MD5 checksums at runtime.
(Github issue :issue:`4909`)

* Experimental adaptations for the CPython "nogil" fork was added.
Note that there is no official support for this in Cython 0.x.
Patch by Sam Gross.  (Github issue :issue:`4912`)

0.29.30

====================

Bugs fixed
----------

* The GIL handling changes in 0.29.29 introduced a regression where
objects could be deallocated without holding the GIL.
(Github issue :issue:`4796`)

0.29.29

====================

Features added
--------------

* Avoid acquiring the GIL at the end of nogil functions.
This change was backported in order to avoid generating wrong C code
that would trigger C compiler warnings with tracing support enabled.
Backport by Oleksandr Pavlyk.  (Github issue :issue:`4637`)

Bugs fixed
----------

* Function definitions in ``finally:`` clauses were not correctly generated.
Patch by David Woods.  (Github issue :issue:`4651`)

* A case where C-API functions could be called with a live exception set was fixed.
Patch by Jakub Kulík.  (Github issue :issue:`4722`)

* Pickles can now be exchanged again with those generated from Cython 3.0 modules.
(Github issue :issue:`4680`)

* Cython now correctly generates Python methods for both the provided regular and
reversed special numeric methods of extension types.
Patch by David Woods.  (Github issue :issue:`4750`)

* Calling unbound extension type methods without arguments could raise an
``IndexError`` instead of a ``TypeError``.
Patch by David Woods.  (Github issue :issue:`4779`)

* Calling unbound ``.__contains__()`` super class methods on some builtin base
types could trigger an infinite recursion.
Patch by David Woods.  (Github issue :issue:`4785`)

* The C union type in pure Python mode mishandled some field names.
Patch by Jordan Brière.  (Github issue :issue:`4727`)

* Allow users to overwrite the C macro ``_USE_MATH_DEFINES``.
Patch by Yuriy Chernyshov. (Github issue :issue:`4690`)

* Improved compatibility with CPython 3.10/11.
Patches by Thomas Caswell, David Woods.
(Github issues :issue:`4609`, :issue:`4667`, :issue:`4721`, :issue:`4730`, :issue:`4777`)

* Docstrings of descriptors are now provided in PyPy 7.3.9.
Patch by Matti Picus.  (Github issue :issue:`4701`)

0.29.28

====================

Bugs fixed
----------

* Due to backwards incompatible changes in CPython 3.11a4, the feature flags
``CYTHON_FAST_THREAD_STATE`` and ``CYTHON_USE_EXC_INFO_STACK`` are now disabled
in Python 3.11 and later.  They are enabled again in Cython 3.0.
Patch by David Woods.  (Github issue :issue:`4610`)

* A C compiler warning in older PyPy versions was resolved.
Patch by Matti Picus.  (Github issue :issue:`4236`)

0.29.27

====================

Features added
--------------

* The ``cythonize`` command has a new option ``-M`` to generate ``.dep`` dependency
files for the compilation unit.  This can be used by external build tools to track
these dependencies.
Patch by Evgeni Burovski.  (Github issue :issue:`1214`)

Bugs fixed
----------

* Compilation failures on PyPy were resolved.
Patches by Matti Picus.  (Github issues :issue:`4509`, :issue:`4517`)

* Calls to ``range()`` with more than three arguments did not fail.
Original patch by Max Bachmann.  (Github issue :issue:`4550`)

* Some C compiler warnings about missing type struct initialisers in Py3.10 were resolved.

* Cython no longer warns about using OpenMP 3.0 features since they are now
considered generally available.

0.29.26

====================

Bugs fixed
----------

* An incompatibility with CPython 3.11.0a3 was resolved.
(Github issue :issue:`4499`)

* The ``in`` operator failed on literal lists with starred expressions.
Patch by Arvind Natarajan.  (Github issue :issue:`3938`)

* A C compiler warning in PyPy about a missing struct field initialisation was resolved.

0.29.25

====================

Bugs fixed
----------

* Several incompatibilities with CPython 3.11 were resolved.
Patches by David Woods, Victor Stinner, Thomas Caswell.
(Github issues :issue:`4411`, :issue:`4414`, :issue:`4415`, :issue:`4416`, :issue:`4420`,
:issue:`4428`, :issue:`4473`, :issue:`4479`, :issue:`4480`)

* Some C compiler warnings were resolved.
Patches by Lisandro Dalcin and others.  (Github issue :issue:`4439`)

* C++ ``std::move()`` should only be used automatically in MSVC versions that support it.
Patch by Max Bachmann.  (Github issue :issue:`4191`)

* The ``Py_hash_t`` type failed to accept arbitrary "index" values.
(Github issue :issue:`2752`)

* Avoid copying unaligned 16-bit values since some platforms require them to be aligned.
Use memcpy() instead to let the C compiler decide how to do it.
(Github issue :issue:`4343`)

* Cython crashed on invalid truthiness tests on C++ types without ``operator bool``.
Patch by David Woods.  (Github issue :issue:`4348`)

* The declaration of ``PyUnicode_CompareWithASCIIString()`` in ``cpython.unicode`` was incorrect.
Patch by Max Bachmann.  (Github issue :issue:`4344`)

0.29.24

====================

Bugs fixed
----------

* Inline functions in pxd files that used memory views could lead to invalid
C code if the module that imported from them does not use memory views.
Patch by David Woods.  (Github issue :issue:`1415`)

* Several declarations in ``libcpp.string`` were added and corrected.
Patch by Janek Bevendorff.  (Github issue :issue:`4268`)

* Pickling unbound Cython compiled methods failed.
Patch by Pierre Glaser.  (Github issue :issue:`2972`)

* The tracing code was adapted to work with CPython 3.10.

* The optimised ``in`` operator failed on unicode strings in Py3.9 and later
that were constructed from an external ``wchar_t`` source.
Also, related C compiler warnings about deprecated C-API usage were resolved.
(Github issue :issue:`3925`)

* Some compiler crashes were resolved.
Patch by David Woods.  (Github issues :issue:`4214`, :issue:`2811`)

* An incorrect warning about 'unused' generator expressions was removed.
(GIthub issue :issue:`1699`)

* The attributes ``gen.gi_frame`` and ``coro.cr_frame`` of Cython compiled
generators and coroutines now return an actual frame object for introspection,
instead of ``None``.
(Github issue :issue:`2306`)

0.29.23

====================

Bugs fixed
----------

* Some problems with Python 3.10 were resolved.
Patches by Victor Stinner and David Woods.  (Github issues :issue:`4046`, :issue:`4100`)

* An incorrect "optimisation" was removed that allowed changes to a keyword
dict to leak into keyword arguments passed into a function.
Patch by Peng Weikang.  (Github issue :issue:`3227`)

* Multiplied str constants could end up as bytes constants with language_level=2.
Patch by Alphadelta14 and David Woods.  (Github issue :issue:`3951`)

* ``PY_SSIZE_T_CLEAN`` does not get defined any more if it is already defined.
Patch by Andrew Jones.  (Github issue :issue:`4104`)

0.29.22

====================

Features added
--------------

* Some declarations were added to the provided pxd includes.
Patches by Zackery Spytz and John Kirkham.
(Github issues :issue:`3811`, :issue:`3882`, :issue:`3899`, :issue:`3901`)

Bugs fixed
----------

* A crash when calling certain functions in Py3.9 and later was resolved.
(Github issue :issue:`3917`)

* ``const`` memory views of structs failed to compile.
(Github issue :issue:`2251`)

* ``const`` template declarations could not be nested.
Patch by Ashwin Srinath.  (Github issue :issue:`1355`)

* The declarations in the ``cpython.pycapsule`` module were missing their
``const`` modifiers and generated incorrect C code.
Patch by Warren Weckesser.  (Github issue :issue:`3964`)

* Casts to memory views failed for fused dtypes.
Patch by David Woods.  (Github issue :issue:`3881`)

* ``repr()`` was assumed to return ``str`` instead of ``unicode`` with ``language_level=3``.
(Github issue :issue:`3736`)

* Calling ``cpdef`` functions from cimported modules crashed the compiler.
Patch by David Woods.  (Github issue :issue:`4000`)

* Cython no longer validates the ABI size of the NumPy classes it compiled against.
See the discussion in https://github.com/numpy/numpy/pull/432

* A C compiler warning about enum value casting was resolved in GCC.
(Github issue :issue:`2749`)

* Coverage reporting in the annotated HTML file failed in Py3.9.
Patch by Nick Pope.  (Github issue :issue:`3865`)

* The embedding code now reports Python errors as exit status.

* Long type declarations could lead to (harmless) random changes in the
C file when used in auto-generated Python wrappers or pickled classes.

Other changes
-------------

* Variables defined as ``cpdef`` now generate a warning since this
is currently useless and thus does not do what users would expect.
Patch by David Woods.  (Github issue :issue:`3959`)

0.29.21

====================

Bugs fixed
----------

* Fix a regression in 0.29.20 where ``__div__`` failed to be found in extension types.
(Github issue :issue:`3688`)

* Fix a regression in 0.29.20 where a call inside of a finally clause could fail to compile.
Patch by David Woods.  (Github issue :issue:`3712`)

* Zero-sized buffers could fail to validate as C/Fortran-contiguous.
Patch by Clemens Hofreither.  (Github issue :issue:`2093`)

* ``exec()`` did not allow recent Python syntax features in Py3.8+ due to
https://bugs.python.org/issue35975.
(Github issue :issue:`3695`)

* Binding staticmethods of Cython functions were not behaving like Python methods in Py3.
Patch by Jeroen Demeyer and Michał Górny.  (Github issue :issue:`3106`)

* Pythran calls to NumPy methods no longer generate useless method lookup code.

* The ``PyUnicode_GET_LENGTH()`` macro was missing from the ``cpython.*`` declarations.
Patch by Thomas Caswell.  (Github issue :issue:`3692`)

* The deprecated ``PyUnicode_*()`` C-API functions are no longer used, except for Unicode
strings that contain lone surrogates.  Unicode strings that contain non-BMP characters
or surrogate pairs now generate different C code on 16-bit Python 2.x Unicode deployments
(such as MS-Windows).  Generating the C code on Python 3.x is recommended in this case.
Original patches by Inada Naoki and Victor Stinner.
(Github issues :issue:`3677`, :issue:`3721`, :issue:`3697`)

* Some template parameters were missing from the C++ ``std::unordered_map`` declaration.
Patch by will.  (Github issue :issue:`3685`)

* Several internal code generation issues regarding temporary variables were resolved.
(Github issue :issue:`3708`)

0.29.20

====================

Bugs fixed
----------

* Nested try-except statements with multiple ``return`` statements could crash
due to incorrect deletion of the ``except as`` target variable.
(Github issue :issue:`3666`)

* The ``classmethod`` decorator no longer rejects unknown input from other decorators.
Patch by David Woods.  (Github issue :issue:`3660`)

* Fused types could leak into unrelated usages.
Patch by David Woods.  (Github issue :issue:`3642`)

* Now uses ``Py_SET_SIZE()`` and ``Py_SET_REFCNT()`` in Py3.9+ to avoid low-level
write access to these object fields.
Patch by Victor Stinner.  (Github issue :issue:`3639`)

* The built-in ``abs()`` function could lead to undefined behaviour when used on
the negative-most value of a signed C integer type.
Patch by Serge Guelton.  (Github issue :issue:`1911`)

* Usages of ``sizeof()`` and ``typeid()`` on uninitialised variables no longer
produce a warning.
Patch by Celelibi.  (Github issue :issue:`3575`)

* The C++ ``typeid()`` function was allowed in C mode.
Patch by Celelibi.  (Github issue :issue:`3637`)

* The error position reported for errors found in f-strings was misleading.
(Github issue :issue:`3674`)

* The new ``c_api_binop_methods`` directive was added for forward compatibility, but can
only be set to True (the current default value).  It can be disabled in Cython 3.0.

0.29.19

====================

Bugs fixed
----------

* A typo in Windows specific code in 0.29.18 was fixed that broke "libc.math".
(Github issue :issue:`3622`)

* A platform specific test failure in 0.29.18 was fixed.
Patch by smutch.  (Github issue :issue:`3620`)

0.29.18

====================

Bugs fixed
----------

* Exception position reporting could run into race conditions on threaded code.
It now uses function-local variables again.

* Error handling early in the module init code could lead to a crash.

* Error handling in ``cython.array`` creation was improved to avoid calling
C-API functions with an error held.

* A memory corruption was fixed when garbage collection was triggered during calls
to ``PyType_Ready()`` of extension type subclasses.
(Github issue :issue:`3603`)

* Memory view slicing generated unused error handling code which could negatively
impact the C compiler optimisations for parallel OpenMP code etc.  Also, it is
now helped by static branch hints.
(Github issue :issue:`2987`)

* Cython's built-in OpenMP functions were not translated inside of call arguments.
Original patch by Celelibi and David Woods.  (Github issue :issue:`3594`)

* Complex buffer item types of structs of arrays could fail to validate.
Patch by Leo and smutch.  (Github issue :issue:`1407`)

* Decorators were not allowed on nested `async def` functions.
(Github issue :issue:`1462`)

* C-tuples could use invalid C struct casting.
Patch by MegaIng.  (Github issue :issue:`3038`)

* Optimised ``%d`` string formatting into f-strings failed on float values.
(Github issue :issue:`3092`)

* Optimised aligned string formatting (``%05s``, ``%-5s``) failed.
(Github issue :issue:`3476`)

* When importing the old Cython ``build_ext`` integration with distutils, the
additional command line arguments leaked into the regular command.
Patch by Kamekameha.  (Github issue :issue:`2209`)

* When using the ``CYTHON_NO_PYINIT_EXPORT`` option in C++, the module init function
was not declared as ``extern "C"``.
(Github issue :issue:`3414`)

* Three missing timedelta access macros were added in ``cpython.datetime``.

* The signature of the NumPy C-API function ``PyArray_SearchSorted()`` was fixed.
Patch by Brock Mendel.  (Github issue :issue:`3606`)

0.29.17

====================

Features added
--------------

* ``std::move()`` is now available from ``libcpp.utility``.
Patch by Omer Ozarslan.  (Github issue :issue:`2169`)

* The ``cython.binding`` decorator is available in Python code.
(Github issue :issue:`3505`)

Bugs fixed
----------

* Creating an empty unicode slice with large bounds could crash.
Patch by Sam Sneddon.  (Github issue :issue:`3531`)

* Decoding an empty bytes/char* slice with large bounds could crash.
Patch by Sam Sneddon.  (Github issue :issue:`3534`)

* Re-importing a Cython extension no longer raises the error
"``__reduce_cython__ not found``".
(Github issue :issue:`3545`)

* Unused C-tuples could generate incorrect code in 0.29.16.
Patch by Kirk Meyer.  (Github issue :issue:`3543`)

* Creating a fused function attached it to the garbage collector before it
was fully initialised, thus risking crashes in rare failure cases.
Original patch by achernomorov.  (Github issue :issue:`3215`)

* Temporary buffer indexing variables were not released and could show up in
C compiler warnings, e.g. in generators.
Patch by David Woods.  (Github issues :issue:`3430`, :issue:`3522`)

* The compilation cache in ``cython.inline("…")`` failed to take the language
level into account.
Patch by will-ca.  (Github issue :issue:`3419`)

* The deprecated ``PyUnicode_GET_SIZE()`` function is no longer used in Py3.

0.29.16

====================

Bugs fixed
----------

* Temporary internal variables in nested prange loops could leak into other
threads.  Patch by Frank Schlimbach.  (Github issue :issue:`3348`)

* Default arguments on fused functions could crash.
Patch by David Woods.  (Github issue :issue:`3370`)

* C-tuples declared in ``.pxd`` files could generate incomplete C code.
Patch by Kirk Meyer.  (Github issue :issue:`1427`)

* Fused functions were not always detected and optimised as Cython
implemented functions.
Patch by David Woods.  (Github issue :issue:`3384`)

* Valid Python object concatenation of (iterable) strings to non-strings
could fail with an exception.
Patch by David Woods.  (Github issue :issue:`3433`)

* Using C functions as temporary values lead to invalid C code.
Original patch by David Woods.  (Github issue :issue:`3418`)

* Fix an unhandled C++ exception in comparisons.
Patch by David Woods.  (Github issue :issue:`3361`)

* Fix deprecated import of "imp" module.
Patch by Matti Picus.  (Github issue :issue:`3350`)

* Fix compatibility with Pythran 0.9.6 and later.
Patch by Serge Guelton.  (Github issue :issue:`3308`)

* The ``_Py_PyAtExit()`` function in ``cpython.pylifecycle`` was misdeclared.
Patch by Zackery Spytz.  (Github issue :issue:`3382`)

* Several missing declarations in ``cpython.*`` were added.
Patches by Zackery Spytz.  (Github issue :issue:`3452`, :issue:`3421`, :issue:`3411`, :issue:`3402`)

* A declaration for ``libc.math.fpclassify()`` was added.
Patch by Zackery Spytz.  (Github issue :issue:`2514`)

* Avoid "undeclared" warning about automatically generated pickle methods.
Patch by David Woods.  (Github issue :issue:`3353`)

* Avoid C compiler warning about unreachable code in ``prange()``.

* Some C compiler warnings in PyPy were resolved.
Patch by Matti Picus.  (Github issue :issue:`3437`)

0.29.15

====================

Bugs fixed
----------

* Crash when returning a temporary Python object from an async-def function.
(Github issue :issue:`3337`)

* Crash when using ``**kwargs`` in generators.
Patch by David Woods.  (Github issue :issue:`3265`)

* Double reference free in ``__class__`` cell handling for ``super()`` calls.
(Github issue :issue:`3246`)

* Compile error when using ``*args`` as Python class bases.
(Github issue :issue:`3338`)

* Import failure in IPython 7.11.
(Github issue :issue:`3297`)

* Fixed C name collision in the auto-pickle code.
Patch by ThePrez.  (Github issue :issue:`3238`)

* Deprecated import failed in Python 3.9.
(Github issue :issue:`3266`)

0.29.14

====================

Bugs fixed
----------

* The generated code failed to initialise the ``tp_print`` slot in CPython 3.8.
Patches by Pablo Galindo and Orivej Desh.  (Github issues :issue:`3171`, :issue:`3201`)

* ``?`` for ``bool`` was missing from the supported NumPy dtypes.
Patch by Max Klein.  (Github issue :issue:`2675`)

* ``await`` was not allowed inside of f-strings.
Patch by Dmitro Getz.  (Github issue :issue:`2877`)

* Coverage analysis failed for projects where the code resides in separate
source sub-directories.
Patch by Antonio Valentino.  (Github issue :issue:`1985`)

* An incorrect compiler warning was fixed in automatic C++ string conversions.
Patch by Gerion Entrup.  (Github issue :issue:`3108`)

* Error reports in the Jupyter notebook showed unhelpful stack traces.
Patch by Matthew Edwards (Github issue :issue:`3196`).

* ``Python.h`` is now also included explicitly from ``public`` header files.
(Github issue :issue:`3133`).

* Distutils builds with ``--parallel`` did not work when using Cython's
deprecated ``build_ext`` command.
Patch by Alphadelta14 (Github issue :issue:`3187`).

Other changes
-------------

* The ``PyMemoryView_*()`` C-API is available in ``cpython.memoryview``.
Patch by Nathan Manville.  (Github issue :issue:`2541`)

0.29.13

====================

Bugs fixed
----------

* A reference leak for ``None`` was fixed when converting a memoryview
to a Python object.  (Github issue :issue:`3023`)

* The declaration of ``PyGILState_STATE`` in ``cpython.pystate`` was unusable.
Patch by Kirill Smelkov.  (Github issue :issue:`2997`)

Other changes
-------------

* The declarations in ``posix.mman`` were extended.
Patches by Kirill Smelkov.  (Github issues :issue:`2893`, :issue:`2894`, :issue:`3012`)

0.29.12

====================

Bugs fixed
----------

* Fix compile error in CPython 3.8b2 regarding the ``PyCode_New()`` signature.
(Github issue :issue:`3031`)

* Fix a C compiler warning about a missing ``int`` downcast.
(Github issue :issue:`3028`)

* Fix reported error positions of undefined builtins and constants.
Patch by Orivej Desh.  (Github issue :issue:`3030`)

* A 32 bit issue in the Pythran support was resolved.
Patch by Serge Guelton.  (Github issue :issue:`3032`)

0.29.11

====================

Bugs fixed
----------

* Fix compile error in CPython 3.8b2 regarding the ``PyCode_New()`` signature.
Patch by Nick Coghlan. (Github issue :issue:`3009`)

* Invalid C code generated for lambda functions in cdef methods.
Patch by Josh Tobin.  (Github issue :issue:`2967`)

* Support slice handling in newer Pythran versions.
Patch by Serge Guelton.  (Github issue :issue:`2989`)

* A reference leak in power-of-2 calculation was fixed.
Patch by Sebastian Berg.  (Github issue :issue:`3022`)

* The search order for include files was changed. Previously it was
``include_directories``, ``Cython/Includes``, ``sys.path``. Now it is
``include_directories``, ``sys.path``, ``Cython/Includes``. This was done to
allow third-party ``*.pxd`` files to override the ones in Cython.
Original patch by Matti Picus.  (Github issue :issue:`2905`)

* Setting ``language_level=2`` in a file did not work if ``language_level=3``
was enabled globally before.
Patch by Jeroen Demeyer.  (Github issue :issue:`2791`)

0.29.10

====================

Bugs fixed
----------

* Fix compile errors in CPython 3.8b1 due to the new "tp_vectorcall" slots.
(Github issue :issue:`2976`)

0.29.9

===================

Bugs fixed
----------

* Fix a crash regression in 0.29.8 when creating code objects fails.

* Remove an incorrect cast when using true-division in C++ operations.
(Github issue :issue:`1950`)

0.29.8

===================

Bugs fixed
----------

* C compile errors with CPython 3.8 were resolved.
Patch by Marcel Plch.  (Github issue :issue:`2938`)

* Python tuple constants that compare equal but have different item
types could incorrectly be merged into a single constant.
(Github issue :issue:`2919`)

* Non-ASCII characters in unprefixed strings could crash the compiler when
used with language level ``3str``.

* Starred expressions in %-formatting tuples could fail to compile for
unicode strings.  (Github issue :issue:`2939`)

* Passing Python class references through ``cython.inline()`` was broken.
(Github issue :issue:`2936`)

0.29.7

===================

Bugs fixed
----------

* Crash when the shared Cython config module gets unloaded and another Cython
module reports an exceptions.  Cython now makes sure it keeps an owned reference
to the module.
(Github issue :issue:`2885`)

* Resolved a C89 compilation problem when enabling the fast-gil sharing feature.

* Coverage reporting did not include the signature line of ``cdef`` functions.
(Github issue :issue:`1461`)

* Casting a GIL-requiring function into a nogil function now issues a warning.
(Github issue :issue:`2879`)

* Generators and coroutines were missing their return type annotation.
(Github issue :issue:`2884`)

0.29.6

===================

Bugs fixed
----------

* Fix a crash when accessing the ``__kwdefaults__`` special attribute of
fused functions.  (Github issue :issue:`1470`)

* Fix the parsing of buffer format strings that contain numeric sizes, which
could lead to incorrect input rejections.  (Github issue :issue:`2845`)

* Avoid a C pragma in old gcc versions that was only added in GCC 4.6.
Patch by Michael Anselmi.  (Github issue :issue:`2838`)

* Auto-encoding of Unicode strings to UTF-8 C/C++ strings failed in Python 3,
even though the default encoding there is UTF-8.
(Github issue :issue:`2819`)

0.29.5

===================

Bugs fixed
----------

* Crash when defining a Python subclass of an extension type and repeatedly calling
a cpdef method on it.  (Github issue :issue:`2823`)

* Compiler crash when ``prange()`` loops appear inside of with-statements.
(Github issue :issue:`2780`)

* Some C compiler warnings were resolved.
Patches by Christoph Gohlke.  (Github issues :issue:`2815`, :issue:`2816`, :issue:`2817`, :issue:`2822`)

* Python conversion of C++ enums failed in 0.29.
Patch by Orivej Desh.  (Github issue :issue:`2767`)

0.29.4

===================

Bugs fixed
----------

* Division of numeric constants by a runtime value of 0 could fail to raise a
``ZeroDivisionError``.  (Github issue :issue:`2820`)

0.29.3

===================

Bugs fixed
----------

* Some C code for memoryviews was generated in a non-deterministic order.
Patch by Martijn van Steenbergen.  (Github issue :issue:`2779`)

* C89 compatibility was accidentally lost since 0.28.
Patches by gastineau and true-pasky.  (Github issues :issue:`2778`, :issue:`2801`)

* A C compiler cast warning was resolved.
Patch by Michael Buesch.  (Github issue :issue:`2774`)

* An compilation failure with complex numbers under MSVC++ was resolved.
(Github issue :issue:`2797`)

* Coverage reporting could fail when modules were moved around after the build.
Patch by Wenjun Si.  (Github issue :issue:`2776`)

0.29.2

===================

Bugs fixed
----------

* The code generated for deduplicated constants leaked some references.
(Github issue :issue:`2750`)

* The declaration of ``sigismember()`` in ``libc.signal`` was corrected.
(Github issue :issue:`2756`)

* Crashes in compiler and test runner were fixed.
(Github issue :issue:`2736`, :issue:`2755`)

* A C compiler warning about an invalid safety check was resolved.
(Github issue :issue:`2731`)

0.29.1

===================

Bugs fixed
----------

* Extensions compiled with MinGW-64 under Windows could misinterpret integer
objects larger than 15 bit and return incorrect results.
(Github issue :issue:`2670`)

* Cython no longer requires the source to be writable when copying its data
into a memory view slice.
Patch by Andrey Paramonov.  (Github issue :issue:`2644`)

* Line tracing of ``try``-statements generated invalid C code.
(Github issue :issue:`2274`)

* When using the ``warn.undeclared`` directive, Cython's own code generated
warnings that are now fixed.
Patch by Nicolas Pauss.  (Github issue :issue:`2685`)

* Cython's memoryviews no longer require strides for setting the shape field
but only the ``PyBUF_ND`` flag to be set.
Patch by John Kirkham.  (Github issue :issue:`2716`)

* Some C compiler warnings about unused memoryview code were fixed.
Patch by Ho Cheuk Ting.  (Github issue :issue:`2588`)

* A C compiler warning about implicit signed/unsigned conversion was fixed.
(Github issue :issue:`2729`)

* Assignments to C++ references returned by ``operator[]`` could fail to compile.
(Github issue :issue:`2671`)

* The power operator and the support for NumPy math functions were fixed
in Pythran expressions.
Patch by Serge Guelton.  (Github issues :issue:`2702`, :issue:`2709`)

* Signatures with memory view arguments now show the expected type
when embedded in docstrings.
Patch by Matthew Chan and Benjamin Weigel.  (Github issue :issue:`2634`)

* Some ``from ... cimport ...`` constructs were not correctly considered
when searching modified dependencies in ``cythonize()`` to decide
whether to recompile a module.
Patch by Kryštof Pilnáček.  (Github issue :issue:`2638`)

* A struct field type in the ``cpython.array`` declarations was corrected.
Patch by John Kirkham.  (Github issue :issue:`2712`)

0.29

=================

Features added
--------------

* PEP-489 multi-phase module initialisation has been enabled again.  Module
reloads in other subinterpreters raise an exception to prevent corruption
of the static module state.

* A set of ``mypy`` compatible PEP-484 declarations were added for Cython's C data
types to integrate with static analysers in typed Python code.  They are available
in the ``Cython/Shadow.pyi`` module and describe the types in the special ``cython``
module that can be used for typing in Python code.
Original patch by Julian Gethmann. (Github issue :issue:`1965`)

* Memoryviews are supported in PEP-484/526 style type declarations.
(Github issue :issue:`2529`)

* ``cython.nogil`` is supported as a C-function decorator in Python code.
(Github issue :issue:`2557`)

* Raising exceptions from nogil code will automatically acquire the GIL, instead
of requiring an explicit ``with gil`` block.

* C++ functions can now be declared as potentially raising both C++ and Python
exceptions, so that Cython can handle both correctly.
(Github issue :issue:`2615`)

* ``cython.inline()`` supports a direct ``language_level`` keyword argument that
was previously only available via a directive.

* A new language level name ``3str`` was added that mostly corresponds to language
level 3, but keeps unprefixed string literals as type 'str' in both Py2 and Py3,
and the builtin 'str' type unchanged.  This will become the default in the next
Cython release and is meant to help user code a) transition more easily to this
new default and b) migrate to Python 3 source code semantics without making support
for Python 2.x difficult.

* In CPython 3.6 and later, looking up globals in the module dict is almost
as fast as looking up C globals.
(Github issue :issue:`2313`)

* For a Python subclass of an extension type, repeated method calls to non-overridden
cpdef methods can avoid the attribute lookup in Py3.6+, which makes them 4x faster.
(Github issue :issue:`2313`)

* (In-)equality comparisons of objects to integer literals are faster.
(Github issue :issue:`2188`)

* Some internal and 1-argument method calls are faster.

* Mod