#501 \graph{(1) -> {(2), (3) -> (2)}}; does not connect nodes 1 and 2

[Gábor Braun]

The following example should produce a graph with three nodes 1, 2,3 and
edges 1->2, 1->3, 3->2. However, the edge 1->2 is omitted in the output.

\documentclass[tikz]{standalone}
\usetikzlibrary{graphs}
\begin{document}
\begin{tikzpicture}
  \node foreach \x in {1,2,3} (\x) at (120*\x:1) {\x};
  \graph{(1) -> {(2), (3) -> (2)}};
\end{tikzpicture}
\end{document}

[Stefan Pinnow]

Are you sure that your syntax is right? Using

\documentclass[tikz]{standalone}
    \usetikzlibrary{graphs}
\begin{document}
\begin{tikzpicture}
  \node foreach \x in {1,2,3} (\x) at (120*\x:1) {\x};
  \graph{(1) -> {(2), (3)} -> (2)};
\end{tikzpicture}
\end{document}

gives the desired result.

(Please note that I have never used the graphs library. If you show me in the manual that your syntax is allowed or an example in the manual that uses your syntax I accept your bug report. Otherwise I'll close it as "invalid" (or similar).

[Gábor Braun]

Are you sure that your syntax is right?

Yes. Please look at the following places in the manual:

Section 19.1 Overview [for specifying graphs]: the last example with edge
labels f, a, g.

Section 19.2.2: Concept: Chain Groups:
the very first example uses a -> {b -> c, d->e } -> f.

Section 19.7.3: This section discusses which nodes should be connected by a
specification like {a, b, c} -> {d, e->f}.

If these do not answer your concerns,
please point out the place where you think the syntax is wrong, because I
am only guessing it now.

[Henri Menke]

Seems to be a problem with the parser. When you flip the order it works.

\graph{(1) -> {(3) -> (2), (2)}};

Bug confirmed.

[Henri Menke]

That's more broken than I thought it was. Try this \graph{(1) -> {(1), (2), (3)}};