diff --git a/src/gn/starlark/crates/ffi/src/target_ref.rs b/src/gn/starlark/crates/ffi/src/target_ref.rs
index 08a4db0..7626a88 100644
--- a/src/gn/starlark/crates/ffi/src/target_ref.rs
+++ b/src/gn/starlark/crates/ffi/src/target_ref.rs
@@ -39,6 +39,8 @@
 }
 
 impl types::TargetRef for TargetRef {
+    type Rule = rule::FrozenRule<crate::eval_context::EvalContext>;
+
     fn label(&self) -> LabelRef<'_> {
         todo!()
     }
@@ -47,6 +49,10 @@
         todo!()
     }
 
+    fn rule(&self) -> Option<&'static Self::Rule> {
+        todo!()
+    }
+
     fn outputs(&self) -> Vec<types::File> {
         todo!()
     }
@@ -62,4 +68,12 @@
     ) {
         todo!()
     }
+
+    fn output_type(&self) -> Option<types::OutputType> {
+        todo!()
+    }
+
+    fn builtin_attrs<'v>(&self, _heap: &Heap<'v>) -> Vec<Value<'v>> {
+        todo!()
+    }
 }