Make `Bow` don't borrow the graph

src/bow.rs

@@ -3,7 +3,7 @@ use petgraph::stable_graph::StableDiGraph;
 use crate::graph::{BendIndex, DotIndex, Label, SegIndex, TaggedIndex, TaggedWeight, Walk};
 use crate::primitive::{Bend, Dot, Seg};
 
-pub struct Bow<'a> {
+pub struct Bow {
     seg1_dot1: DotIndex,
     seg1: SegIndex,
     seg1_dot2: DotIndex,
@@ -11,11 +11,10 @@ pub struct Bow<'a> {
     seg2_dot1: DotIndex,
     seg2: SegIndex,
     seg2_dot2: DotIndex,
-    graph: &'a StableDiGraph<TaggedWeight, Label, usize>,
 }
 
-impl<'a> Bow<'a> {
+impl Bow {
-    pub fn new(index: BendIndex, graph: &'a StableDiGraph<TaggedWeight, Label, usize>) -> Self {
+    pub fn new(index: BendIndex, graph: &StableDiGraph<TaggedWeight, Label, usize>) -> Self {
         let bend = index;
 
         let seg1_dot2 = Bend::new(bend, graph).prev().unwrap();
@@ -42,12 +41,11 @@ impl<'a> Bow<'a> {
             seg2_dot1,
             seg2,
             seg2_dot2,
-            graph,
         }
     }
 }
 
-impl<'a> Walk for Bow<'a> {
+impl Walk for Bow {
     fn interior(&self) -> Vec<TaggedIndex> {
         vec![
             TaggedIndex::Seg(self.seg1),

src/router.rs

@@ -5,7 +5,7 @@ use std::cell::{Ref, RefCell};
 use std::rc::Rc;
 
 use crate::astar::astar;
-use crate::graph::{BendIndex, DotIndex, Path, SegIndex, TaggedIndex};
+use crate::graph::{BendIndex, DotIndex, SegIndex, TaggedIndex, Walk};
 use crate::graph::{BendWeight, DotWeight, SegWeight, TaggedWeight};
 use crate::guide::Guide;
 use crate::layout::Layout;