[Bug c++/71841] variadic template can't cast to base class

[johan.leroy at openehs dot co.uk]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71841

--- Comment #3 from johan.leroy at openehs dot co.uk ---
clang version I've used:

$ clang --version
clang version 3.8.0 (branches/release_38)
Target: x86_64-pc-windows-msvc
Thread model: posix
InstalledDir: C:\LLVM\bin

file compiles without a problem