Is it defined behavior to modify `iter` while `for`-looping over it?

New to Julia
,
30

I somehow figured out this brain burning situation, thanks to odow in an other topic.

function test()
    v = []
    for k = 1:3 # 3 passes here
        # associate the pass-local name `item` to `-9`
        item = -9
        f = function()
            println("I'm ", item)
        end # `f` is following the pass-local _name_ `item`
        # re-bind the pass-local name `item` to `k` 
        item = k
        push!(v, f)
        # print the status (note that the latest status of `item` is `k`)
        map(x -> x(), v)
        # re-bind the pass-local name `item` to `-1`,
        # therefore `f` is updated accordingly
        item = -1
        # `item` is going to lose connection with us,
        # therefore the pass-local `f` will not be updated in the future
    end
end

test()