[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?

Also pinging @DougGregor, who introduced this special case in 81495f341d4a8a06a1d775c31562a37dc2f9c7fe, in case there was a reason it was limited to lambdas.

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