\usetikzlibrary{arrows.meta,shapes.symbols,matrix,positioning}
\begin{document}
\begin{tikzpicture}[node distance=1em]
- \node (s1) {\verb#>>|.#};
- \node (d1) [left=of s1.north,yshift=-3em] {\verb#delay 500#};
- \node (s2) [right=of s1.north,yshift=-3em] {\verb#>>=.# $\lambda x\shortrightarrow$};
+ \node (s2) {\verb#>>=.# $\lambda x\shortrightarrow$};
\node (wd) [left=of s2.north,yshift=-3em] {\verb#writeD D3 st#};
\node (rec) [right=of s2.north,yshift=-3em,fill=gray!15,label={[xshift=1em,label distance=-5pt]above:{\tiny interpreter}}] {\verb#blink (Not x)#};
- \draw (s1.south) -- (d1.north);
- \draw (s1.south) -- (s2.north);
\draw (s2.south) -- (wd.north);
\draw (s2.south) -- ([xshift=-1.5em]rec.north);
% \draw [->,dashed] ([xshift=-1.5em]rec.north) to [out=25,in=25] (s1.east);