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[lua-transducers :( ]$ lua -v
Lua 5.3.1  Copyright (C) 1994-2015 Lua.org, PUC-Rio
[ lua-transducers :) ]$ lua sample.lua 
demonstrating transduce.	{ 2, 3, 4, 5 }
lua: ./functional.lua:10: attempt to call a nil value (global 'unpack')
stack traceback:
	./functional.lua:10: in local 'transducer'
	./transducers.lua:138: in function 'transducers.transduce'
	sample.lua:28: in main chunk
	[C]: in ?