[Bug c++/58910] std::Tuple_impl is non constexpr when using identical userdefined structs as template-args

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58910

Paolo Carlini <paolo.carlini at oracle dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[4.9 Regression]            |std::Tuple_impl is non
                   |std::Tuple_impl is non      |constexpr when using
                   |constexpr when using        |identical userdefined
                   |identical userdefined       |structs as template-args
                   |structs as template-args    |

--- Comment #2 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Sorry, in fact this isn't a regression. Still the issue seems serious in terms
of impact on <tuple> use. I also note that with the same <tuple>
implementation, clang++ accepts the testcases, thus seems definitely a
front-end issue.