In Python 3.10, _PyEval_EvalFrameDefault() has the API:

PyObject* _PyEval_EvalFrameDefault(PyThreadState *tstate, PyFrameObject *f, int throwflag);

In Python 3.11, bpo-44590 (commit ae0a2b756255629140efcbe57fc2e714f0267aa3 "Lazily allocate frame objects (GH-27077)") changed it to:

PyObject* _PyEval_EvalFrameDefault(PyThreadState *tstate, InterpreterFrame *frame, int throwflag);

Problem: InterpreterFrame is part of the internal C API.

By the way, PyInterpreterState.eval_frame type (_PyFrameEvalFunction) also changed. This field type already changed in Python 3.9:

* ``PyInterpreterState.eval_frame`` (:pep:`523`) now requires a new mandatory
  *tstate* parameter (``PyThreadState*``).
  (Contributed by Victor Stinner in :issue:`38500`.)

Maybe the Python 3.11 change should be documented in What's New in Python 3.11, as it was in What's New in Python 3.9.


I propose to move most _PyEval private functions to the internal C API to clarify that they must be used.

typo: "I propose to move most _PyEval private functions to the internal C API to clarify that they must *NOT* be used." :-)

See also bpo-46836: "[C API] Move PyFrameObject to the internal C API".

New changeset 332b04bac35cd7305c60da2d5733940dc089949a by Victor Stinner in branch 'main':
bpo-46850: Remove _PyEval_SetAsyncGenFinalizer() (GH-32017)
https://github.com/python/cpython/commit/332b04bac35cd7305c60da2d5733940dc089949a

New changeset 9087243e2c167e38570e819b228efc3492c38c9c by Victor Stinner in branch 'main':
bpo-46850: Remove _PyEval_GetCoroutineOriginTrackingDepth() (GH-32018)
https://github.com/python/cpython/commit/9087243e2c167e38570e819b228efc3492c38c9c

New changeset e63894b3eed8ad2dd7690695f7f07bfbff59c05a by Victor Stinner in branch 'main':
bpo-46850: Remove _PyEval_CallTracing() function (GH-32019)
https://github.com/python/cpython/commit/e63894b3eed8ad2dd7690695f7f07bfbff59c05a

New changeset b9a5522dd952125a99ff554f01f311cae25f5a91 by Victor Stinner in branch 'main':
bpo-46850: Move _PyEval_EvalFrameDefault() to internal C API (GH-32052)
https://github.com/python/cpython/commit/b9a5522dd952125a99ff554f01f311cae25f5a91

New changeset f877b40e3f7e0d97878884d80fbec879a85ab7e8 by Victor Stinner in branch 'main':
bpo-46850: Move _PyInterpreterState_SetEvalFrameFunc() to internal C API (GH-32054)
https://github.com/python/cpython/commit/f877b40e3f7e0d97878884d80fbec879a85ab7e8

per https://mail.python.org/archives/list/python-dev@python.org/message/GFOMU7LP63JUVFMWNJNZJLUMZDRPTUYJ/ lets roll some of those PRs back and reshape where we move these APIs as despite the PEP they were not as private as other privates.

(deferred blocker meaning: block 3.11beta1 - though Pablo could decide to have the rollbacks block 3.11alpha7)

New changeset 2b4f2f5fa4d1123c19bf0643cfa5a4fe8df4175c by Victor Stinner in branch 'main':
Revert "bpo-46850: Move _PyEval_EvalFrameDefault() to internal C API (GH-32052)" (GH-32343)
https://github.com/python/cpython/commit/2b4f2f5fa4d1123c19bf0643cfa5a4fe8df4175c

The change was rejected by the Steering Council:
https://mail.python.org/archives/list/python-dev@python.org/message/GFOMU7LP63JUVFMWNJNZJLUMZDRPTUYJ/