aaron.ballman added a comment.

In https://reviews.llvm.org/D33735#770296, @ABataev wrote:

> In https://reviews.llvm.org/D33735#770288, @aaron.ballman wrote:
>
> > Can you help me to understand what problem is being solved with this new 
> > attribute? Under what circumstances would the first argument be an 
> > `ImplicitParamDecl` but not an implicit this or self?
>
>
> For captured regions an outlined function is created, where all parameters 
> are ImplicitParamDecls. And the very first parameter is wrongly treated as 
> 'this' argument of the member function.


Ah, thank you! That makes sense to me, but it begs the question: why an 
attribute rather than a bit on ImplicitParamDecl?


https://reviews.llvm.org/D33735



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