[Bug c++/79746] [7 Regression] Confusing -Wunused-but-set-parameter warning with virtual inheritance

[sgunderson at bigfoot dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79746

--- Comment #6 from sgunderson at bigfoot dot com ---
Thanks. But I'm still curious; is the second code snippet well-formed or not?