Uncaught failed assertion when node belongs to multiple ranks

[siefkenj]

I am not sure if it is in the scope of this project, but when presented with the following graph

digraph {
    subgraph cluster0 {
        a;
    }
    subgraph {
        rank=same
        a; b;
    }
}

dot issues Warning: a was already in a rankset, ignored in cluster _anonymous_0 and continues processing the graph. Viz.js on the other hand issues Assertion failed: find_fast_node(g, n), at: fastgr.c,231,delete_fast_node and does not continue laying out the graph. When dot runs is it catching these errors and telling the program to keep going? Is this something possible in Viz.js?

[siefkenj]

My apologies. This seems to be something that works in graphviz 2.26, but not in 2.28. Upstream problem!