diff --git a/crates/stef-playground/src/lib.rs b/crates/stef-playground/src/lib.rs
index 3922e4c..4fcc2db 100644
--- a/crates/stef-playground/src/lib.rs
+++ b/crates/stef-playground/src/lib.rs
@@ -159,6 +159,11 @@ mod tests {
         });
     }
 
+    #[test]
+    fn sample3() {
+        roundtrip(&sample::Sample3(true, (vec![1, 2, 3, 4, 5], -500_000)));
+    }
+
     #[test]
     fn sample_gen() {
         roundtrip(&sample::gens::SampleGen {
diff --git a/crates/stef-playground/src/sample.stef b/crates/stef-playground/src/sample.stef
index 5e74576..01c083e 100644
--- a/crates/stef-playground/src/sample.stef
+++ b/crates/stef-playground/src/sample.stef
@@ -16,6 +16,9 @@ enum Sample2 {
     } @3,
 }
 
+/// A tuple struct.
+struct Sample3(bool @1, (bytes, i64) @2)
+
 const CHRISTMAS_MONTH: u8 = 12;
 const CHRISTMAS_DAY: u8 = 24;