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impl Default, Copy, Clone for std::io::Sink and Empty by ijackson · Pull Request...
source link: https://github.com/rust-lang/rust/pull/86744
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The omission of Sink: Default is causing me a slight inconvenience in a test harness. There seems little reason for this and Empty not to be Clone and Copy too.
I have made all three of these insta-stable, because:
AIUI Copy can only be derived, and I was not able to find any examples of how to unstably derive it. I think it is probably not possible.
I hunted through the git history for precedent and found
which was also insta-stable.
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