no type named 'type' in 'struct std::enable_if<false, xsimd::batch<double, 4> >'

[nbecker]

xtensor-0.16.3
xsimd-4.1.6
xtensor-blas-0.11.0

This code:

https://gist.github.com/nbecker/251112eb10e8effbdeb0545eabef6b31

compiled with
g++ -o mag_sqr.cpython-36m-x86_64-linux-gnu.os -c -g -std=c++1z -O3 -march=native -fvisibility=hidden -flto -DNDEBUG -ffast-math -fPIC -DHAVE_CBLAS -DXTENSOR_USE_XSIMD -I/home/nbecker/.local/include/xtensor-blas/flens -I/home/nbecker/.local/include -I/usr/include/eigen3 -I/home/nbecker/.local/lib/python3.6/site-packages/numpy/core/include -I/usr/include/python3.6m mag_sqr.cc

results in errors (rather long, not copied here)