[PATCH 2 of 2] copies._forwardcopies: use set operations to find missing files

[Bryan O'Sullivan]

On Thu, Apr 4, 2013 at 8:39 PM, Siddharth Agarwal <sid0 at fb.com> wrote:

> copies._forwardcopies: use set operations to find missing files
>

Crewed both, thanks.
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