a confusing error message
c = vcsn.context('lal_char(ab)')
---------------------------------------------------------------------------
RuntimeError Traceback (most recent call last)
<ipython-input-4-972639f44128> in <module>()
----> 1 c = vcsn.context('lal_char(ab)')
RuntimeError: expected ,, got
while reading context: lal_char(ab)
Furtunately, I know what I should write, but the double ',,' and unterminated sentence is very confusing.