Shrink code produced by smallvec![].
          #385
        
          
      
                
     Merged
            
            
          
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Currently
smallvec![]expands to this:This commit adds a rule to the
smallvec!macro for the zero-length case so it instead expands to this:The
std::vec!macro already has a similar special case.This commit also improves the non-zero case.
#[allow(unused_mut)], which was only needed for the zero-length case.*repetitions to+. (Again, likestd::vec.)