static assertion failed

[PhilipDeegan]

gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/8/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 8.3.0-6' --with-bugurl=file:///usr/share/doc/gcc-8/README.Bugs --enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++ --prefix=/usr --with-gcc-major-version-only --program-suffix=-8 --program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --enable-bootstrap --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-vtable-verify --enable-libmpx --enable-plugin --enable-default-pie --with-system-zlib --with-target-system-zlib --enable-objc-gc=auto --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-offload-targets=nvptx-none --without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 8.3.0 (Debian 8.3.0-6)

/path/to/git/Vc/tests/math.cpp:82:1:   required from here
/path/to/git/Vc/tests/virtest/vir/test.h:256:9: error: static assertion failed: A type that doesn't compare to bool slipped into the default compare_traits. Please specialize vir::test::compare_traits as needed.
         std::is_same<decltype(a == b), bool>::value,
         ^~~
/path/to/git/Vc/tests/virtest/vir/test.h:259:17: error: cannot convert ‘Vc::v2::simd<int, Vc::v2::simd_abi::__avx_abi<> >::mask_type’ {aka ‘Vc::v2::simd_mask<int, Vc::v2::simd_abi::__avx_abi<> >’} to ‘bool’ in return
     return a == b;
                 ^
compilation terminated due to -fmax-errors=10