401e880a336576b765e5d6bb1a9718947243d92b is the first bad commit
commit 401e880a336576b765e5d6bb1a9718947243d92b
Author: da-woods <dw-git@d-woods.co.uk>
Date:   Fri Sep 29 11:11:22 2023 +0100

    Show performance hints for nogil functions requiring exception checks (GH-5673)
    
    Performance hints come out similar to warnings but do not make `-Werror` fail.

 Cython/Compiler/Errors.py       | 14 +++++++++
 Cython/Compiler/ExprNodes.py    |  7 +++--
 Cython/Compiler/Nodes.py        |  3 +-
 Cython/Compiler/Options.py      |  4 +++
 Cython/Compiler/PyrexTypes.py   | 13 ++++++++-
 Cython/Compiler/Scanning.py     |  1 +
 Cython/Compiler/Symtab.py       | 12 ++++++++
 Cython/Compiler/TreeFragment.py |  8 +++++-
 Cython/Compiler/UtilityCode.py  |  3 +-
 runtests.py                     | 64 +++++++++++++++++++++++++----------------
 tests/run/nogil.pxd             |  1 +
 tests/run/nogil.pyx             | 39 ++++++++++++++++++++++++-
 tests/run/nogil_other.pxd       |  2 ++
 13 files changed, 138 insertions(+), 33 deletions(-)
 create mode 100644 tests/run/nogil.pxd
 create mode 100644 tests/run/nogil_other.pxd