tufte-book doesn't work with with autonum

[wierdlmate]

the following gives me an error

    \documentclass{tufte-book}

    \usepackage{autonum}
    \begin{document}

    \begin{equation}
      1=1 \label{eq:1}
    \end{equation}
    \end{document}

I get the error

   Runaway argument?
   \@nolnerr \fi 
   ! Paragraph ended before \llm@CarThree was complete.
    <to be read again> 
                       \par 
     l.6 \begin{equation}

When I comment out the line loading autonum, all is well --- except I do not get the benefits of autonum.

I add that using the standard book class with autonum, I get no errors.

Help appreciated

[oliviercailloux]

See also https://tex.stackexchange.com/questions/348274/tufte-book-doesnt-work-with-autonum