@fredrik-johansson, this was broken by #537, see [before](https://travis-ci.org/github/fredrik-johansson/mpmath/jobs/679998558) and [after](https://travis-ci.org/github/fredrik-johansson/mpmath/jobs/689208142). I think, the slow marker definition should be moved to the conftest.py somewhere.
@fredrik-johansson, this was broken by #537, see before and after.
I think, the slow marker definition should be moved to the conftest.py somewhere.