[Bug c++/68926] [4.9/5/6 Regression] decltype and sfinae to check for template instance availability fails to compile

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68926

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to work|                            |4.7.4
            Summary|decltype and sfinae to      |[4.9/5/6 Regression]
                   |check for template instance |decltype and sfinae to
                   |availability fails to       |check for template instance
                   |compile                     |availability fails to
                   |                            |compile
      Known to fail|                            |4.8.0

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This compiled OK with 4.7