[Bug c++/82047] non-existent variable template used to initialize variable

[john at mcfarlane dot name]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82047

--- Comment #3 from John McFarlane <john at mcfarlane dot name> ---
This still happens when S has member variables.  For example, if `S` is
replaced with `std::complex`, then `v<std::complex<T>>` is `{0,0}`.