luaL_dofile() returns LUA_YIELD ?

["Pixel Pusher" <pixpush@...>]

Hi again,
can anyone plase point me to documented cases where luaL_dofile() returns a LUA_YIELD error code ?
It is not very clear in the docs what to do in such a case (I only found it in lua.h...but isn't commented there as well) ...since yelding is only documented for coroutines, rather than other functions.
Does it have something to do with the recovery functions in "ldo.c" in the Lua source code ?

Thanks for any help.