Revert "Add a test case showing the new flexibility of Seq"

This reverts commit 0e4fef6.

serde_with/tests/serde_as/map_tuple_list.rs

@@ -319,74 +319,3 @@ fn test_tuple_array_as_map() {
             }"#]],
     );
 }
-
-#[test]
-fn test_map_as_custom_struct() {
-    let ip = "1.2.3.4".parse().unwrap();
-    let ip2 = "255.255.255.255".parse().unwrap();
-
-    use serde_with::{de::DeserializeAsWrap, ser::SerializeAsWrap, DeserializeAs, SerializeAs};
-
-    #[derive(serde::Serialize, serde::Deserialize)]
-    struct Custom<K, V> {
-        custom_key: K,
-        v: V,
-    }
-
-    impl<K, KAs, V, VAs> SerializeAs<(K, V)> for Custom<KAs, VAs>
-    where
-        KAs: SerializeAs<K>,
-        VAs: SerializeAs<V>,
-    {
-        fn serialize_as<S>((k, v): &(K, V), serializer: S) -> Result<S::Ok, S::Error>
-        where
-            S: serde::Serializer,
-        {
-            (Custom {
-                custom_key: SerializeAsWrap::<K, KAs>::new(k),
-                v: SerializeAsWrap::<V, VAs>::new(v),
-            })
-            .serialize(serializer)
-        }
-    }
-
-    impl<'de, K, KAs, V, VAs> DeserializeAs<'de, (K, V)> for Custom<KAs, VAs>
-    where
-        KAs: DeserializeAs<'de, K>,
-        VAs: DeserializeAs<'de, V>,
-    {
-        fn deserialize_as<D>(deserializer: D) -> Result<(K, V), D::Error>
-        where
-            D: serde::Deserializer<'de>,
-        {
-            let c = <Custom<DeserializeAsWrap<K, KAs>, DeserializeAsWrap<V, VAs>>>::deserialize(
-                deserializer,
-            )?;
-            Ok((c.custom_key.into_inner(), c.v.into_inner()))
-        }
-    }
-
-    #[serde_as]
-    #[derive(Debug, Serialize, Deserialize, PartialEq)]
-    struct SM(#[serde_as(as = "Seq<Custom<_, _>>")] BTreeMap<u32, IpAddr>);
-
-    let map: BTreeMap<_, _> = vec![(1, ip), (10, ip), (200, ip2)].into_iter().collect();
-    is_equal(
-        SM(map),
-        expect![[r#"
-            [
-              {
-                "custom_key": 1,
-                "v": "1.2.3.4"
-              },
-              {
-                "custom_key": 10,
-                "v": "1.2.3.4"
-              },
-              {
-                "custom_key": 200,
-                "v": "255.255.255.255"
-              }
-            ]"#]],
-    );
-}