Missing definition of a template virtual function

Hi,

(Sorry I accidently sent this to cfe-commits. Resending it to cfe-dev)

I want to discuss the issue in PR27895,

https://llvm.org/bugs/show_bug.cgi?id=27895

But I will give a slightly different example for this discussion.

The issue can be demonstrated by this standalone code. Should this example link

successfully?