%
% Collision of two tables when a table is started in an unexpected moment
% http://tex.stackexchange.com/questions/167400/fancyhdr-and-cals-vertical-merge-problem
%

\setbox\cals@backup@row=\hbox{nonsense}

\begin{calstable}
\colwidths{{90pt}}
\brow
\nullcell{ltr}
\erow
\brow
\nullcell{lbr}\spancontent{spanned}
\erow
\end{calstable}

\show Y