[Bug c++/57101] [4.8/4.9 Regression] -fcompare-debug failure with <type error>

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57101

--- Comment #3 from Paolo Carlini <paolo.carlini at oracle dot com> ---
This is fixed in mainline. I'm adding the testcase and keeping the bug open
with only the [4.8 Regression] marker.