coroutine.lua

local coroutine_first = nil
local coroutine_second = nil

local function caller_first()
    print("First coroutine")
    print("Starting second coroutine")
    result_coroutine = coroutine_second
end

local function caller_second()
    print("Second coroutine")
    print("Starting first coroutine")
    result_coroutine = coroutine_first

end

function main()
    coroutine_first = coroutine.wrap(caller_first())
    print("Test between wraps")
    coroutine_second = coroutine.wrap(caller_second())
    result_coroutine = coroutine_first
    print("End main" + result_coroutine)
end

main()