I think I have solved the lifetime issue.

OwnedBreadcrumbTreeElement's needed a lifetime associated with them because IntoContextElement had lifetimes associated with it.

src/renderer/breadcrumb_tree.rs

@@ -13,7 +13,7 @@ pub enum BreadcrumbTreeElement<'a> {
     // the same BreadcrumbTreeElement but a different parent (for
     // example, when inserting behind the tail), we don't need to the
     // copy the already owned/malloc'd data.
-    Owned(Rc<dyn IntoContextElement>),
+    Owned(Rc<dyn IntoContextElement + 'a>),
     Borrowed(&'a dyn IntoContextElement),
 }