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> I should have been more specific.  I mean from C++.  I could do a
> lua_getglobal(), then a lua_isnil(), then a lua_pop, but that seems a bit
> cumbersome.

I see no other way. Function values are just like any other type. There is
nothing specific to a function global. I would check lua_type, instead of
lua_isnil, just for safety.