在灵魂包中应用嵌套框

Question

\documentclass[a4paper,twocolumn]{article}
\usepackage{tikz}
\usetikzlibrary{decorations.pathmorphing}

% \usepackage{soul}
\usepackage{soulpos}
\begin{document}
\ulposdef\ulpgfC[xoffset=.15em]{%
  \ifulstarttype{0}%
    {\def\arr{|}}%
    {\def\arr{<}}%
  \ifulendtype{0}%
    {\edef\arr{\arr-|}}%
    {\edef\arr{\arr->}}%
  \raisebox{-.7ex}{%
    \tikz
    \draw[\arr,color=black!40,
          line width=1pt]
    (0,0) -- +(\ulwidth-1pt,0);}}

\ulpgfC{this a text this a text this a text this a text this a text this a textthis a textthisthis a text this a text  this a text this a text this a text this a textthis a textthisthis a textthis this a text this a text this a text this a text this a text v this a text this a text this a text this a textthis a text v this a text}

\end{document}

\_________________________________________________________________________
        \documentclass[a4paper,twocolumn]{article}
    \usepackage{tikz}
    \usetikzlibrary{decorations.pathmorphing}
    
    \usepackage{soul}
    \usepackage{soulpos}
    \begin{document}
    \ulposdef\ulpgfC[xoffset=.15em]{%
      \ifulstarttype{0}%
        {\def\arr{|}}%
        {\def\arr{<}}%
      \ifulendtype{0}%
        {\edef\arr{\arr-|}}%
        {\edef\arr{\arr->}}%
      \raisebox{-.7ex}{%
        \tikz
        \draw[\arr,color=black!40,
              line width=1pt]
        (0,0) -- +(\ulwidth-1pt,0);}}
    
    \newbox\mine
    \sbox\mine{\ulpgfC{a text this a text xtthis this a text this a text this a text this a text this a text v this a text this a text this a text this a textthis a text v this a text}}
    \ulpgfC{this a text this a text this  this a text this a textthis {\usebox\mine} a textthisthis a text this a text  this a text this a text this a text this a textthis a textthisthis a textthis this a text this a text this a text this a text this a text v this a text this a text this a text this a textthis a text v this a text}
    
    \end{document}

我正在尝试使用由“soulpos”包制作的嵌套宏。每当尝试时，都会出现错误，重建失败，由 latex 引发。你能和我分享你的解决方案吗？