One more case of handling newtype structs

src/de.rs

@@ -438,9 +438,19 @@ impl<'de, 'b> de::Deserializer<'de> for MapVisitor<'de, 'b> {
         visitor.visit_some(self)
     }
 
+    fn deserialize_newtype_struct<V>(
+        self,
+        _name: &'static str,
+        visitor: V
+    ) -> Result<V::Value, Error>
+        where V: de::Visitor<'de>
+    {
+        visitor.visit_newtype_struct(self)
+    }
+
     forward_to_deserialize_any! {
         bool u8 u16 u32 u64 i8 i16 i32 i64 f32 f64 char str string seq
-        bytes byte_buf map struct unit newtype_struct identifier
+        bytes byte_buf map struct unit identifier
         ignored_any unit_struct tuple_struct tuple enum
     }
 }

tests/serde.rs

@@ -525,3 +525,32 @@ fn newtypes() {
         Table(map! { b: Integer(2) }),
     }
 }
+
+#[test]
+fn newtypes2() {
+    #[derive(Deserialize, Serialize, PartialEq, Debug, Clone)]
+	struct A {
+		b: B
+	}
+
+    #[derive(Deserialize, Serialize, PartialEq, Debug, Clone)]
+	struct B(Option<C>);
+
+    #[derive(Deserialize, Serialize, PartialEq, Debug, Clone)]
+	struct C {
+		x: u32,
+		y: u32,
+		z: u32
+	}
+
+    equivalent! {
+        A { b: B(Some(C { x: 0, y: 1, z: 2 })) },
+        Table(map! {
+            b: Table(map! {
+                x: Integer(0),
+                y: Integer(1),
+                z: Integer(2)
+            })
+        }),
+    }
+}