Function is_feasible 

fn is_feasible<G0, G1, NM, EM>(
    st: &mut (Vf2State<'_, G0>, Vf2State<'_, G1>),
    nodes: (G0::NodeId, G1::NodeId),
    node_match: &mut NM,
    edge_match: &mut EM,
) -> bool
where
    G0: GetAdjacencyMatrix + GraphProp + NodeCompactIndexable + IntoNeighborsDirected,
    G1: GetAdjacencyMatrix + GraphProp + NodeCompactIndexable + IntoNeighborsDirected,
    NM: NodeMatcher<G0, G1>,
    EM: EdgeMatcher<G0, G1>,