hrtb not working.

src/parser/new_context.rs

@@ -68,3 +68,47 @@ impl<'r> ContextElement<'r> for PreviousElementNode<'r> {
         ChainBehavior::AndParent(None)
     }
 }
+
+pub struct ContextTree<'r, T> {
+    head: Option<Node<'r, T>>,
+}
+
+impl<'r, T> ContextTree<'r, T>
+where
+    T: for<'s> ContextElement<'s>,
+{
+    pub fn new() -> Self {
+        ContextTree { head: None }
+    }
+
+    pub fn with_additional_node<F: for<'s> ContextElement<'s>>(
+        &'r self,
+        element: F,
+    ) -> ContextTree<'r, F> {
+        let new_node = {
+            let parent: Option<&dyn NodeType<'_>> = match &self.head {
+                Some(node) => Some(node),
+                None => None,
+            };
+            Node {
+                data: element,
+                parent,
+            }
+        };
+
+        ContextTree {
+            head: Some(new_node),
+        }
+    }
+}
+
+fn test_context() {
+    let foo = "foo";
+    let context = ContextTree::new();
+    let child1_context = PreviousElementNode { dummy: foo };
+    let child1 = context.with_additional_node(&child1_context);
+    let child2_context = FailMatcherNode {
+        fail_matcher: ChainBehavior::AndParent(Some(&recognize_bold_end)),
+    };
+    let child2 = child1.with_additional_node(&child2_context);
+}