Seems that there some errors in Windows in Azure

The windows build still fails, not sure where the errors are coming from :(

Yeah, me neither. I'm gonna continue investigating, but if someone from the @python/windows-team could enlighten us, it'd be helpful.

I guess the failure is unrelated to the changes of this PR. It probably has something to do with the Azure environment, since the exact same build target succeeds in the Windows Github Action, but fails with multiple compile errors on Azure.

I guess the failure is unrelated to the changes of this PR. It probably has something to do with the Azure environment, since the exact same build target succeeds in the Windows Github Action, but fails with multiple compile errors on Azure.

But then why other PRs do not have the same problem?

But then why other PRs do not have the same problem?

Unfortunately, I don't know. Will investigate more tomorrow.

The reason for the breakage is that you're indirectly including Python-ast.h into Python.h (via pegen_interface.h).
Python-ast.h defines a lot of unprefixed names (historical mistake), like Yield or Set. It should never ever be included into Python.h (or any other header for that matter). Consider using struct _mod instead of mod_ty in header files.

Consider using struct _mod instead of mod_ty in header files.

Or split the header file into a private version and a public one, which I think is cleaner

It should never ever be included into Python.h (or any other header for that matter). Consider using struct _mod instead of mod_ty in header files.

And I was wondering why in pythonrun.h struct _mod * is used instead of mod_ty.