I've pushed a commit to address @CaseyCarter's suggestion (using braces for the temporary, and applying [[maybe_unused]] to args_store even though compilers don't warn yet that it's unused at runtime). What persuaded me is that now we don't have to reason about the behavior of a test-only variable template. (Fewer lines is nicer but not decisive.)

I'm mirroring this to the MSVC-internal repo - please notify me if any further changes are pushed.

Thanks for implementing more Cat Template Argument Destruction, where cats bat fragile template arguments off the table to smash on the floor! 🐈 🐾 😼