don't like the ergonomics there

Author: molpopgen

tests/test_edge_difference_iteration.rs

@@ -56,6 +56,16 @@ fn make_treeseq() -> tskit::TreeSequence {
         .unwrap()
 }
 
+#[test]
+fn test_collected_edge_insertions() {
+    let ts = make_treeseq();
+    let insertions = ts
+        .edge_differences_iter()
+        .flat_map(|d| d.insertions().collect::<Vec<_>>())
+        .collect::<Vec<_>>();
+    assert_eq!(insertions.len(), ts.edge_insertion_order().len());
+}
+
 // A fundamental property of iterators is that their Items
 // are collectible into objects that are valid to use later.
 #[test]