diff --git a/src/parse.rs b/src/parse.rs
index 26c4aa5..dd75844 100644
--- a/src/parse.rs
+++ b/src/parse.rs
@@ -150,14 +150,13 @@ fn nodes_from_str(s: &str) -> Result<Vec<Node>, Error> {
 fn test_nodes_from_str() {
     assert_eq!(
         nodes_from_str("sin(2) + 1").unwrap().as_slice(),
-        vec![
+        &[
             Node::Function(Function::Sine),
             Node::ParenthesisStart,
             Node::Number(Float::with_val(512, 2)),
             Node::ParenthesisEnd,
             Node::Operator(Operator::Plus),
             Node::Number(Float::with_val(512, 1))
-        ]
-        .as_slice(),
+        ],
     )
 }