Box<_> support for serde

[Byron]

I have a recursive structure which looks very much like this:

/// There is no detailed description.
/// 
/// This type is not used in any activity, and only used as *part* of another schema.
/// 
#[derive(Default, Clone, Debug, Serialize, Deserialize)]
pub struct ItemScope {
    /// The start date and time of the event (in ISO 8601 date format).    
    #[serde(alias="startDate")]
    pub start_date: String,
    /// The end date and time of the event (in ISO 8601 date format).    
    #[serde(alias="endDate")]
    pub end_date: String,
    /// The text that is the result of the app activity. For example, if a user leaves a review of a restaurant, this might be the text of the review.    
    pub text: String,
    /// A URL to the image that represents this result. For example, if a user writes a review of a restaurant and attaches a photo of their meal, you might use that photo as the result.image.    
    pub image: String,
    /// Review rating.    
    #[serde(alias="reviewRating")]
    pub review_rating: Option<Box<ItemScope>>,
}

As you can see, I have to use a Box to allow such a struct to exist. With rustc_serialize, I was able to encode and decode it, with serde I get errors like this:

the trait `serde::de::Deserialize` is not implemented for the type `Box<ItemScope>`

This is just happening for me in the plus1 API, so it's by no means a show-stopper.
Also I may note that with an older compiler version (and rustc_serialize) I was able to just use Box<ItemScope> without issues. Now, it really wants Option<Box<ItemScope>> - may be a bug.

Details on where this issue is coming from can be watched on youtube.

Meta

✗ rustc --version --verbose
rustc 1.0.0-nightly (ea8b82e90 2015-03-17) (built 2015-03-18)
binary: rustc
commit-hash: ea8b82e90c450febb1f26a07862a1ec89c22addd
commit-date: 2015-03-17
build-date: 2015-03-18
host: x86_64-apple-darwin
release: 1.0.0-nightly

➜  rust-serde git:(master) glog
* 42bd905 (HEAD, mine/master, master) fix(macros): fully qualified usage of `Result`
* 5378d22 (origin/master, origin/HEAD) Switch to the new custom_deserialize syntax
* c8b2ad0 Update to rust HEAD
* e778c7e Update to rust HEAD
*   f0d0dd2 Merge pull request #41 from hugoduncan/feature/mark-field-attributes-used
|\
| * 3e63d34 Mark serde field attributes as used
|/

[tomprogrammer]

Is this fixed by #49?

[Byron]

Yes, this works for me now, thank you !