nico wrote:

Yes, but we have tests that are sensitive to this, and we already updated them 
when we rolled in the original libc++ change. Our options are now:

* disable them until both clang and libc++ have rolled, then remember to enable 
them again (and lose the libc++ optimization we had picked up until then)
* put `__has_feature(...)` checks in the test and then remember to remove it 
again once both have rolled (and also lose the optimization until then)

https://github.com/llvm/llvm-project/pull/158523
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