[Rails] confusion with inline rescue

I am not getting any output:

can any one point me by saying where did I wrong?

ar = [1,2,3,1,5,3,"a","b","c"]
e = ar.each_slice(3)
e.size.times{|i| i = e.next; p i if (e.peek rescue StopIteration) == nil
}

I want the output: ["a","b","c"] but getting nothing.

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