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Perhaps not exactly what you want, but if you just want to know whether
a given state is the top state (or main thread) then you can use
lua_pushthread: it returns 1 if L is the top state.

BTW, the manual entry at
	http://www.lua.org/manual/5.1/manual.html#lua_pushthread
is wrong: it lists lua_pushthread a returning nothing, but lua.h says
it returns int. Sorry about that.
--lhf