Using with on inner type parameters

[lawliet89]

Consider the Url struct where the serde implementation is provided by a separate crate url_serde.

If my struct contains a Url to be (de)serialized, I can do:

#[derive(Serialize, Deserialize)]
struct MyStruct {
    #[serde(with = "url_serde")]
    url: Url,
}

But if my struct contains something else like HashMap<Url>, I will have to define a new wrapper type around Url before I can include HashMap<Url> in my struct AFAIK.

Is it even possible for serde to support the with attribute for this inner Url type?

[dtolnay]

This is not supported but we are tracking it in #723. It needs more design work.

[lawliet89]

Thanks. I guess I wasn't using the right keywords to search.