Using controls and cycle in a named picture leads to “no shape … known” error.

[Wrzlprmft]

Minimal example:

\documentclass{standalone}
\usepackage{tikz}

\tikzset{pics/mypic/.style={code={
	\draw (0,0) .. controls (1,1) .. cycle;
}}}

\begin{document}
	\begin{tikzpicture}
		\pic (myname) {mypic};
	\end{tikzpicture}
\end{document}

This raises the following error:

! Package pgf Error: No shape named mynamecurrent subpath start is known.

See the pgf package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
                                                  
l.10 		\pic (myname) {mypic}
                            ;

The following changes remove the problem:

• Using -- instead of controls.
• Using (0,0) instead of cycle.
• Not naming the picture, i.e., removing myname.

[hmenke]

What I find most interesting is that this works at all. I always thought that the only legal construction that you could use was -- cycle;. Does it work if the pic content is

\draw (0,0) .. controls (1,1) .. (0,0) -- cycle;

[Wrzlprmft]

Does it work if the pic content is

\draw (0,0) .. controls (1,1) .. (0,0) -- cycle;

Yes, that throws no error.

[hmenke]

Short investigation shows that this is most likely a duplicate of #311