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require("import") -- the import fn
import("enum_rename") -- import lib
er=enum_rename
-- catch "undefined" global variables
local env = _ENV -- Lua 5.2
if not env then env = getfenv () end -- Lua 5.1
setmetatable(env, {__index=function (t,i) error("undefined global variable `"..i.."'",2) end})
assert(er.M_Jan ~= nil)
assert(er.May ~= nil)
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