[Bug c++/71504] bogus error: accessing value through a glvalue in a constant expression

[will at dash dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71504

--- Comment #5 from Will <will at dash dot org> ---
Oops -
I left the wandbox link on Clang...
Here's the GCC Head link:
https://wandbox.org/permlink/rfvn9VSwZgU6nerN