bors d367482491 auto merge of #12871 : aochagavia/rust/Optimize-while_some, r=alexcrichton
The old 'while' needed to match 2 times for each iteration. With the new 'loop' there is just one match needed.

I have also replaced 'blk' by 'f' to be more consistent with parameter names in other functions that are implemented for Option<T>
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