[Bug c++/80990] cv-qualifiers ignored in variable definition using class template argument deduction

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80990

--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Fixed on trunk so far, I'd like to backport this to gcc-7-branch.