Deserialize_with generates bad code if there is a type parameter called D

[dtolnay]

Both of these generate code that fails to compile:

#[derive(Deserialize)]
struct S<D> {
    #[serde(deserialize_with="de")]
    d: D
}

#[derive(Deserialize)]
struct S<D> {
    d: D,
    #[serde(deserialize_with="de")]
    i: i32,
}

error: type parameter `D` shadows another type parameter of the same name [E0194]
                                     fn deserialize<D>(__d:
                                                    ^

[dtolnay]

Fixed in #315, can be closed.

[oli-obk]

if you add fixes #id to the PR, or a commit, the issues will be closed automatically when the PR is merged

[dtolnay]

Neat, I will do that in the future. Please also close #90 #141 #158.