Function ptree::graph::print_graph

pub fn print_graph<N, E, Ty, Ix>(
    graph: &Graph<N, E, Ty, Ix>, 
    start: NodeIndex<Ix>
) -> Result<()> where
    Ty: EdgeType,
    Ix: IndexType,
    N: Clone + Display,
    E: Clone, 

Print graph, starting at node start, to standard output using default formatting