Issue#100222 added a struct toInclude/cpython/code.h (which is included by default byPython.h) that is not compliant C++:

typedef union {    uint16_t cache;    struct {        uint8_t opcode;        uint8_t oparg;    };} _Py_CODEUNIT;

The struct member requires a name, as only anonymous structs are currently permitted in standard C++.

(And since the original issue invokes PEP 7, I'll do the same and point out that "The public C API should be compatible with C++". The intention of this clause is that standard C++ can#include <Python.h>, which is currently broken.)

Linked PRs

• gh-101907: Removes use of non-standard C++ extension from Include/cpython/code.h #101909
• gh-101907: Stop using_Py_OPCODE and_Py_OPARG macros #101912