[Bug c++/71487] sorry, unimplemented: mangling offset_ref

[lemonedo at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71487

--- Comment #1 from Chungmin Lee <lemonedo at gmail dot com> ---
You might say that in the above scenario HasLength does not have to be a
template, but it is just a simplified example.