Fix tuple variant serialization with serde

Signed-off-by: Heinz N. Gies <heinz@licenser.net>

src/serde/se.rs

@@ -193,7 +193,7 @@ where
         if self.first {
             Ok(())
         } else {
-            iomap!(self.s.write(b"}"))
+            iomap!(self.s.write(b"]}"))
         }
     }
 }
@@ -815,6 +815,20 @@ mod test {
     #[cfg(not(target_arch = "wasm32"))]
     use proptest::prelude::*;
 
+    #[test]
+    fn enum_tuple() {
+        #[derive(serde::Serialize, Clone)]
+        enum ErrType {
+            Instruction(i64, i64),
+        }
+
+        let err = ErrType::Instruction(2, 68800);
+
+        assert_eq!(
+            crate::to_string(&err).expect("failed to serialize"),
+            "{\"Instruction\":[2,68800]}",
+        );
+    }
     #[test]
     fn print_serde() {
         #[derive(Clone, Debug, PartialEq, serde::Serialize)]

src/tests/serde.rs

@@ -553,7 +553,6 @@ fn map1() {
     assert_eq!(to_value(d1), Ok(Value::from(h)));
 }
 
-#[cfg(feature = "serde_impl")]
 #[test]
 fn tpl1() {
     let mut d = String::from("[-65.613616999999977, 43.420273000000009]");
@@ -701,7 +700,6 @@ fn crazy_string() {
     assert_eq!(v_simd, v_serde);
 }
 
-#[cfg(feature = "serde_impl")]
 #[test]
 fn event() {
     #[derive(Deserialize, Debug, PartialEq, Eq)]
@@ -825,7 +823,6 @@ fn arb_json() -> BoxedStrategy<String> {
     .boxed()
 }
 
-#[cfg(feature = "serde_impl")]
 #[test]
 fn int_map_key() -> Result<(), crate::Error> {
     use std::collections::BTreeMap;