rat: 'none' and `law` do not work well together
Because of the implementation of concat
, we have:
$ v python -c "import vcsn; print(vcsn.context('law, q').expression('ab', 'none'))"
<1>(ab)
I'm not sure whether none
deserve that we fix it, it's there only to help debugging, but if we can fix it easily, that would be nice. In which case, reenable the tests about expression transposition in tests/python/transpose.py
.