Does pycore_global_strings.h need to be updated too, to add STRUCT_FOR_ID(expression) and STRUCT_FOR_ID(conversion)?

You're right, it does. I'll fix that!

Interesting. My build locally works, I'll try a git clean and see if it fails.

Interesting. My build locally works, I'll try a git clean and see if it fails.

(I deleted that comment -- still suspect it might be a me thing. Thanks for looking, though!)

Huh that's strange. Let me know if you get it to build or not!

Here's how it looks on my machine:

Yeah, it builds and import string works fine in the cpython devcontainer.

Something about creating a docker image from it, though, is where things are going wrong. string is not included. Still digging. Thanks for the quick response!

Ah, perhaps string needs to be added to LIBSUBDIRS in Makefile.pre.in.

I'm also able to build it in a docker container:

I'll try adding it to LIBSUBDIRS, let me know if that fixes it for you!

Yup, that did the trick; the official docker-library/python Dockerfiles now result in working builds when aimed at your branch.

I'll update the pep750-examples repository's dev container to use this build.

Thanks again!

One more detail:

That should probably report type(x) as <class 'string.templatelib.Template'>? (Here, and related for TemplateIter and Interpolation.)

Good catch, I've updated the types.