Derived member functions as coroutines

I have an abstract base class which I am deriving from in Lua and
overriding virtual functions, using wrap_base as described in the
documentation.

Where I run into problems is calling the derived members as coroutines:

luabind::object self; // this gets passed to wrapper's constructor by
derived class's __init

luabind::object func = self["foo"];
luabind::resume_function<void>(func, self);

This all appears to work properly until the coroutine calls yield().
When this happens, lua_status() returns 0 rather than LUA_YIELD, so my
scheduler decides the coroutine has exited and drops it.

Is this a bug in luabind or am I doing something incorrectly?

Matt

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