Impl Deserialize for PhantomData<T> for all T

testing/tests/test_gen.rs

@@ -6,6 +6,8 @@ extern crate serde;
 use self::serde::ser::{Serialize, Serializer};
 use self::serde::de::{Deserialize, Deserializer};
 
+use std::marker::PhantomData;
+
 //////////////////////////////////////////////////////////////////////////
 
 #[derive(Serialize, Deserialize)]
@@ -23,6 +25,11 @@ struct WithRef<'a, T: 'a> {
     x: X,
 }
 
+#[derive(Serialize, Deserialize)]
+struct PhantomX {
+    x: PhantomData<X>,
+}
+
 #[derive(Serialize, Deserialize)]
 struct Bounds<T: Serialize + Deserialize> {
     t: T,