royjacobson added a comment.

In D147655#4250056 <https://reviews.llvm.org/D147655#4250056>, @rsmith wrote:

> There has not been any stable ABI from any compiler targeting the Itanium C++ 
> ABI for constrained templates prior to this change. I don't think we need to 
> worry too much about people using unfinished compiler features being broken 
> when those features are finished.

The ABI has been stable for quite some time and people have been using concepts 
with it for almost 3 years now. I'm not sure we can still break ABI this 
easily. But then, I also have no data to say we can't.

> The ABI proposals haven't been accepted yet; I'm not intending to land this 
> change until the proposals have reached consensus in the Itanium C++ ABI 
> group.

Thanks for clarifying!


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D147655/new/

https://reviews.llvm.org/D147655

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