rjmccall added a comment.

Should we have a special `has_feature` test to check that this attribute is 
allowed on implementations?  We've done that in the past when expanding the set 
of subjects for an attribute.  But that's not necessary if we haven't made this 
attribute part of a public Xcode release yet, because then the attribute is 
just understood to always apply to implementations; I can't remember when 
exactly this was added and what releases it's made it into.


Repository:
  rC Clang

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D60544/new/

https://reviews.llvm.org/D60544



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