Lua 5.2.2  Copyright (C) 1994-2013 Lua.org, PUC-Rio
> t = {}
> meta = {__index = function(self, key) print("__index", key) return 3 end }
> meta2 = {__index = function(self, key) print("meta __index", key) return 4 end}
> setmetatable(meta, meta2)
> setmetatable(t, meta)
> =t.foo
__index foo
3
> =#t
0
> t[1] = 1
>