diff --git a/src/protocol/eval.rs b/src/protocol/eval.rs
index 1f7a71288986d49cbab4f04e145dd9e1c36948ac..0d37e152b5c05da853162089be83102d9ce49477 100644
--- a/src/protocol/eval.rs
+++ b/src/protocol/eval.rs
@@ -87,6 +87,7 @@ impl Value {
                 }
             }
             Literal::Character(_data) => unimplemented!(),
+            Literal::Struct(_data) => unimplemented!(),
         }
     }
     fn set(&mut self, index: &Value, value: &Value) -> Option<Value> {