Commits on Jun 30, 2021

1. impl Default, Copy, Clone for std::io::Sink and Empty …

   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 Copycan 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
   
     79b8ad8
     Implement `Copy` for `IoSlice`
     rust-lang#69403
   
   which was also insta-stable.
   
   Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

   

   ijackson committed Jun 30, 2021
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