Use PriorityQueue for Dijkstra's, requires Hash for Vertex

src/models/append_graph.rs

@@ -7,14 +7,14 @@ use crate::traits::{GraphTopology, IncidenceCursor};
 ///
 /// Handles are stable for the lifetime of the graph. Obtain via graph methods like
 /// [`AppendGraph::add_vertex`] and [`AppendGraph::vertices`].
-#[derive(Copy, Clone, PartialEq, Eq, Debug)]
+#[derive(Copy, Clone, PartialEq, Eq, Debug, Hash)]
 pub struct Vertex(usize);
 
 /// An opaque handle identifying an edge in an [`AppendGraph`].
 ///
 /// Handles are stable for the lifetime of the graph. Obtain via graph methods like
 /// [`AppendGraph::add_edge`] and [`AppendGraph::edges`].
-#[derive(Copy, Clone, PartialEq, Eq, Debug)]
+#[derive(Copy, Clone, PartialEq, Eq, Debug, Hash)]
 pub struct Edge(usize);
 
 /// An [`EntityMap`] for [`AppendGraph`] vertices.