Hi all,
I'm working on developing a MicroVM backend for PyPy. It's a virtual machine under active research and development by my colleagues in ANU. It aims to capture GC, threading and JIT in the virtual machine, and frees up the burden of the language implementers.

Since MicroVM provides GC, I need to remove GC from the PyPy interpreter. As I was trying to compile it with the following command:
    pypy $PYPY/rpython/bin/rpython \
          -O0 \
          --gc=none \
          --no-translation-rweakref \
          --annotate \
          --rtype \
          --translation-backendopt-none \
          $PYPY/pypy/goal/targetpypystandalone.py
It gives off an error during annotation stage, saying that it's not able to find a module called '_rweakref'. Does anyone know what the problem might be, and how one might go and solve it?

    Appreciate greatly,
    John Zhang
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