[Bug c++/79470] [7 Regression] "partial specialization is not more specialized" with variadic non-type const& template parameters

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79470

Martin Sebor <msebor at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |rejects-valid
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2017-02-14
                 CC|                            |msebor at gcc dot gnu.org
            Summary|"partial specialization is  |[7 Regression] "partial
                   |not more specialized" with  |specialization is not more
                   |variadic non-type const&    |specialized" with variadic
                   |template parameters         |non-type const& template
                   |(possible regression)       |parameters
     Ever confirmed|0                           |1

--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
Confirmed.  Besides Clang, EDG 4.11 also accepts the code in strict mode. 
Bisection points to r243868 (gcc 7.0.0):

r243868 | jason | 2016-12-21 14:38:35 -0500 (Wed, 21 Dec 2016) | 5 lines

Check that a partial specialization is more specialized.

        * pt.c (process_partial_specialization): Use
        get_partial_spec_bindings to check that the partial specialization
        is more specialized than the primary template.