1 files changed, 11 insertions, 0 deletions
diff --git a/src/error.rs b/src/error.rs
new file mode 100644
index 0000000..fd91045
--- /dev/null
+++ b/src/error.rs
@@ -0,0 +1,11 @@
+#[derive(Debug, thiserror::Error)]
+pub enum Error<Id>
+where
+    Id: crate::NodeId,
+{
+    #[error("Node not found: {:?}", .0)]
+    NodeNotFound(Id),
+
+    #[error("Node does not have HEAD as parent")]
+    HeadNotAParent,
+}