graph: change documentation to allow self edges
No behaviour change; package simple graphs still panic for addition of self
edges, as noted in their existing documentation.
@@ -99,8 +99,9 @@ type EdgeSetter interface {
// If the graph supports node addition the nodes
// will be added if they do not exist, otherwise
// SetEdge will panic.
- // If the IDs returned by e.From and e.To are
- // equal, SetEdge will panic.
+ // The behavior of an EdgeSetter when the IDs
+ // returned by e.From and e.To are equal is
+ // implementation-dependent.
SetEdge(e Edge)
}
