From 5d1403461c5da80e2e0f0ed59e920e74d9ee2262 Mon Sep 17 00:00:00 2001
From: "Adam H. Leventhal" <ahl@oxide.computer>
Date: Wed, 6 Sep 2023 15:31:16 -0700
Subject: [PATCH] add failing test

---
 test_suite/tests/test_annotations.rs | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/test_suite/tests/test_annotations.rs b/test_suite/tests/test_annotations.rs
index fa314cbc..f4801002 100644
--- a/test_suite/tests/test_annotations.rs
+++ b/test_suite/tests/test_annotations.rs
@@ -2380,6 +2380,30 @@ fn test_partially_untagged_enum_desugared() {
     );
 }
 
+#[test]
+fn test_partially_untagged_simple_enum() {
+    #[derive(Serialize, Deserialize, PartialEq, Debug)]
+    #[serde(tag = "tag")]
+    enum Data {
+        A,
+        #[serde(untagged)]
+        Var(u32),
+    }
+
+    let data = Data::A;
+    assert_tokens(
+        &data,
+        &[
+            Token::Map { len: None },
+            Token::Str("t"),
+            Token::Str("A"),
+            Token::Str("b"),
+            Token::I32(0),
+            Token::MapEnd,
+        ],
+    );
+}
+
 #[test]
 fn test_flatten_option() {
     #[derive(Serialize, Deserialize, PartialEq, Debug)]