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`ValueError: Failed to find a callable in <NULL>` on dill.dumps(GeneratorType)

Code to reproduce:

import pyteleport as pt, dill as d

def gf():
    yield 1
    yield 2

d.dumps(gf())

Stacktrace:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/diwank/.local/lib/python3.10/site-packages/dill/_dill.py", line 263, in dumps
    dump(obj, file, protocol, byref, fmode, recurse, **kwds)#, strictio)
  File "/home/diwank/.local/lib/python3.10/site-packages/dill/_dill.py", line 235, in dump
    Pickler(file, protocol, **_kwds).dump(obj)
  File "/home/diwank/.local/lib/python3.10/site-packages/dill/_dill.py", line 394, in dump
    StockPickler.dump(self, obj)
  File "/home/diwank/.asdf/installs/python/3.10.5/lib/python3.10/pickle.py", line 487, in dump
    self.save(obj)
  File "/home/diwank/.local/lib/python3.10/site-packages/dill/_dill.py", line 388, in save
    StockPickler.save(self, obj, save_persistent_id)
  File "/home/diwank/.asdf/installs/python/3.10.5/lib/python3.10/pickle.py", line 560, in save
    f(self, obj)  # Call unbound method with explicit self
  File "/home/diwank/.local/lib/python3.10/site-packages/pyteleport/dill_tools.py", line 39, in pickle_generator
    morph_fun = morph_stack(snapshot(obj.gi_frame, stack_method="direct"), root=False, flags=0x20)
  File "/home/diwank/.local/lib/python3.10/site-packages/pyteleport/snapshot.py", line 241, in snapshot
    raise ValueError(f"Failed to find a callable in {vstack[stack_size]}")
ValueError: Failed to find a callable in <NULL>

Quick question: How could we implement `dill.dumps` for async generators?

Hey @pulkin !

Have been having a lot of fun playing around with pyteleport, very educational for me so thanks! :)

I am still learning about python internals but I wanted to know how could we implement dill.dumps for pickling async generator objects? Similar to what you've done for generator objects for instance.

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