%
% Bug hunting / regresion test
%
\begin{calstable}
\colwidths{{50pt}}
\cals@setpadding{}\cals@setcellprevdepth{}

\brow
 \cell{\noindent\vrule height50pt depth0pt width10pt}
  \cell{\noindent\vrule height50pt depth0pt width10pt}
   \nullcell{tlr}\show\cals@spanq@heights
    \erow
\brow
 \cell{\noindent\vrule height50pt depth0pt width10pt}
  \nullcell{tlr}\show\cals@spanq@heights
   \nullcell{lr}\show\cals@spanq@heights
    \erow
\brow
 \cell{\noindent\vrule height50pt depth0pt width10pt}
  \nullcell{lr}\show\cals@spanq@heights
   \nullcell{rlb}\spancontent{\noindent\vrule height50pt depth0pt width10pt}\show\cals@spanq@heights
    \erow
\brow
 \cell{\noindent\vrule height50pt depth0pt width10pt}
  \nullcell{lrb}\spancontent{\noindent\vrule height50pt depth0pt width10pt}\show\cals@spanq@heights
   \cell{\noindent\vrule height50pt depth0pt width10pt}
    \erow
\end{calstable}