diff --git a/flux-core/src/semantic/flatbuffers/types.rs b/flux-core/src/semantic/flatbuffers/types.rs
index c3eecf06..9baf4070 100644
--- a/flux-core/src/semantic/flatbuffers/types.rs
+++ b/flux-core/src/semantic/flatbuffers/types.rs
@@ -715,7 +715,7 @@ mod tests {

     fn test_serde(expr: &'static str) {
         // let want = parser::parse(expr).unwrap();
-        let mut p = parser::Parser::new(expr.clone());
+        let mut p = parser::Parser::new(expr);

         let typ_expr = p.parse_type_expression();
         if let Err(err) = ast::check::check(ast::walk::Node::TypeExpression(&typ_expr)) {