[Bug c++/58080] internal compiler error, decltype in function declaration (for SFINAE purposes)

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58080

--- Comment #8 from Paolo Carlini <paolo.carlini at oracle dot com> ---
By the way, with my patch installed, all the new testcases seem fine,
consistent with clang.