JDevlieghere added a comment.

In D128378#3602888 <https://reviews.llvm.org/D128378#3602888>, @aprantl wrote:

> Oh boy, these are scary. Should LLDB fail harder when the utility expression 
> fails, so we can detect these earlier?

Fortunately we print an error, but we're also pretty resilient against some of 
this information missing. This bug was particularly tricky because it only 
causes a problem the second time that you execute the utility function, which 
only occurs when you have lazily instantiated classes (in Swift) which is why 
we didn't see this on llvm.org


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D128378/new/

https://reviews.llvm.org/D128378

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