2e40852005311e99ce34df261c62fb0259dee7a4
Add CFError support <!-- Reviewable:start --> This change is [<img src="https://reviewable.io/review_button.svg" height="35" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/core-foundation-rs/77) <!-- Reviewable:end -->
Description
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Rust
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