diff --git a/src/node_enum.rs b/src/node_enum.rs
index 1a3c60d..df07745 100644
--- a/src/node_enum.rs
+++ b/src/node_enum.rs
@@ -773,6 +773,14 @@ impl NodeEnum {
                         }
                     });
                 }
+                NodeMut::NullTest(e) => {
+                    let e = e.as_mut().unwrap();
+                    if let Some(n) = e.arg.as_mut() {
+                        if let Some(n) = n.node.as_mut() {
+                            iter.push((n.to_mut(), depth, context));
+                        }
+                    }
+                }
                 NodeMut::ResTarget(t) => {
                     let t = t.as_mut().unwrap();
                     if let Some(n) = t.val.as_mut() {
@@ -831,6 +839,14 @@ impl NodeEnum {
                         }
                     }
                 }
+                NodeMut::TypeCast(t) => {
+                    let t = t.as_mut().unwrap();
+                    if let Some(n) = t.arg.as_mut() {
+                        if let Some(n) = n.node.as_mut() {
+                            iter.push((n.to_mut(), depth, context));
+                        }
+                    }
+                }
                 //
                 // from-clause items
                 //