[clang] [Sema] Add lambda decltype((x)) semantics to blocks (#207355) (PR #207583)

[Akira Hatanaka via cfe-commits]

ahatanak wrote:

> Because this relates to Objective-C feature behavior in other language modes, we'd generally like to see a signal from Apple that they're comfortable with the direction.

This change looks reasonable to me. @rjmccall do you have any thoughts?



https://github.com/llvm/llvm-project/pull/207583