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/usr/share/awk/processarray.awk is in gawk 1:4.1.3+dfsg-0.1.

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function process_array(arr, name, process, do_arrays,   i, new_name)
{
    for (i in arr) {
        new_name = (name "[" i "]")
        if (isarray(arr[i])) {
            if (do_arrays)
                @process(new_name, arr[i])
            process_array(arr[i], new_name, process, do_arrays)
        } else
            @process(new_name, arr[i])
    }
}