[Bug c++/70979] [C++14] g++ falsely accepts constexpr function returning a lambda

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70979

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |accepts-invalid
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2016-05-06
                 CC|                            |msebor at gcc dot gnu.org
             Blocks|                            |55004
     Ever confirmed|0                           |1
      Known to fail|                            |5.3.0, 6.1.0

--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
Confirmed.  Constexpr functions involving lambdas are not in C++ 14.  A
proposal to accept the construct was voted in to the next version of the
language, C++ 17, at the last C++ meeting (P0170R1 -
https://isocpp.org/files/papers/P0170R1.pdf).  G++ is ahead of the game on this
feature but it should either disable it or diagnose it with a warning in C++ 14
mode.


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55004
[Bug 55004] [meta-bug] constexpr issues