Fix panic in remove_node for Definition nodes

crates/wac-graph/src/graph.rs

@@ -1038,7 +1038,7 @@ impl CompositionGraph {
         if let NodeKind::Definition = node.kind {
             log::debug!(
                 "removing type definition `{name}`",
-                name = node.name.as_ref().unwrap()
+                name = node.export.as_ref().unwrap()
             );
             let removed = self.defined.remove(&node.item_kind.ty());
             assert!(removed.is_some());
@@ -1969,6 +1969,23 @@ mod test {
         ));
     }
 
+    #[test]
+    fn it_can_remove_a_type_definition() {
+        let mut graph = CompositionGraph::new();
+        let ty_id = graph
+            .types_mut()
+            .add_defined_type(DefinedType::Alias(ValueType::Primitive(PrimitiveType::S32)));
+        let node_id = graph
+            .define_type("foo", Type::Value(ValueType::Defined(ty_id)))
+            .unwrap();
+
+        // Definition nodes store their name in `export`, not `name`.
+        // Removing a definition node should not panic.
+        graph.remove_node(node_id);
+
+        // Verify the definition and export were cleaned up
+        assert!(graph.get_export("foo").is_none());
+    }
     #[test]
     fn it_cleans_up_exports_on_unregister_package() {
         let mut graph = CompositionGraph::new();