lua-scope is simple Resource Acquisition Is Initialization implementation for Lua.
local scope = require "scope"
scope(function(guard)
local f = assert(io.open("out", "w"))
-- always executed at the end of the function
guard:on_exit(function() f:close() end)
-- might die or might not
do_more_stuff(f)
local f2 = assert(io.open("out", "w"))
-- some other protector
guard:on_exit(function() f2:close() end)
do_more_stuff_2(f2)
end)luarocks install luascope