[PATCH] Fix PR20619 - failure to define implicit copy ctor of a by val capture in a generic lambda

[Richard Smith]

>>! In D6171#5, @faisalv wrote:
> 
>> We shouldn't mark the operation as used if the generic lambda itself appears in a dependent context. I would strongly prefer that we set the CurContext to the context surrounding the generic lambda before processing an implicit capture to handle that case.
> 
> But I thought this patch won't mark it as used if the enclosing context is dependent - since I explicitly check for that - what am I missing?

It's still the wrong way to do this. Rather than working around the context being wrong, you should switch to the right context before building the copy.

http://reviews.llvm.org/D6171