local __TS__Iterator
do
    local function iteratorGeneratorStep(self)
        local co = self.____coroutine
        local status, value = coroutine.resume(co)
        if not status then
            error(value, 0)
        end
        if coroutine.status(co) == "dead" then
            return
        end
        return true, value
    end
    local function iteratorIteratorStep(self)
        local result = self:next()
        if result.done then
            return
        end
        return true, result.value
    end
    local function iteratorStringStep(self, index)
        index = index + 1
        if index > string.len(self) then
            return
        end
        return index, string.sub(self, index, index)
    end
    function __TS__Iterator(iterable)
        if type(iterable) == "string" then
            return iteratorStringStep, iterable, 0
        elseif iterable.____coroutine ~= nil then
            return iteratorGeneratorStep, iterable
        elseif iterable[Symbol.iterator] then
            local iterator = iterable[Symbol.iterator](iterable)
            return iteratorIteratorStep, iterator
        else
            return ipairs(iterable)
        end
    end
end