diff --git a/src/parser/nom_context.rs b/src/parser/nom_context.rs
index 0b579bf..c195ae3 100644
--- a/src/parser/nom_context.rs
+++ b/src/parser/nom_context.rs
@@ -28,8 +28,8 @@ impl<'r, 's> ContextTree<'r, 's> {
     }
 
     pub fn pop_front(&mut self) -> (Option<ContextElement<'r, 's>>, ContextTree<'r, 's>) {
-        // todo
-        todo!()
+        let (popped_element, remaining) = self.tree.pop_front();
+        (popped_element, ContextTree { tree: remaining })
     }
 
     pub fn check_fail_matcher<'b>(
@@ -66,7 +66,7 @@ impl<'r, 's> ContextTree<'r, 's> {
                         }
                     };
                 }
-                ContextElement::PreviousElementNode(_) => todo!(),
+                ContextElement::PreviousElementNode(_) => {}
             };
 
             current_node = current_node.without_front();