# The code relies on the fact that no weakref can be an old object
# weakly pointing to a young object. Indeed, weakrefs are immutable
# so they cannot point to an object that was created after it.
+ # Thanks to this, during a minor collection, we don't have to fix
+ # or clear the address stored in old weakrefs.
"""Called during a nursery collection."""
# walk over the list of objects that contain weakrefs and are in the