Switching back to a Vec because inserting multiple elements into the linked list structure while maintaining ownership of each node proved to be difficult.

src/renderer/parameters_context.rs

@@ -2,7 +2,6 @@ use crate::parser::Filter;
 use crate::parser::KVPair;
 use crate::parser::OwnedLiteral;
 use crate::parser::RValue;
-use crate::renderer::breadcrumb_tree::BreadcrumbTree;
 use crate::renderer::breadcrumb_tree::BreadcrumbTreeElement;
 use crate::renderer::context_element::CompareContextElement;
 use crate::renderer::context_element::ContextElement;
@@ -29,7 +28,7 @@ pub struct ParametersContext<'a> {
 impl<'a> ParametersContext<'a> {
     pub fn new(
         renderer: &DustRenderer,
-        breadcrumbs: Option<&'a BreadcrumbTree>,
+        breadcrumbs: &'a Vec<BreadcrumbTreeElement<'a>>,
         params: &'a Vec<KVPair>,
     ) -> Self {
         // If the parameter is a Path, then we resolve it immediately
@@ -72,7 +71,7 @@ impl<'a> IntoContextElement for ParametersContext<'a> {
     fn into_context_element<'b>(
         &'b self,
         renderer: &DustRenderer,
-        breadcrumbs: Option<&'b BreadcrumbTree<'b>>,
+        breadcrumbs: &'b Vec<BreadcrumbTreeElement<'b>>,
     ) -> Option<IceResult<'b>> {
         panic!("into_context_element cannot be called on pseudo elements");
     }
@@ -95,7 +94,7 @@ impl<'a> IntoContextElement for RValue<'a> {
     fn into_context_element<'b>(
         &'b self,
         renderer: &DustRenderer,
-        breadcrumbs: Option<&'b BreadcrumbTree<'b>>,
+        breadcrumbs: &'b Vec<BreadcrumbTreeElement<'b>>,
     ) -> Option<IceResult<'b>> {
         match self {
             RValue::RVLiteral(owned_literal) => Some(IceResult::from_borrowed(owned_literal)),