serde_as with generic types

[JosiahParry]

I'm trying to use serde_as with this example from the serde github issues. Where we have a custom deserializer and serializer for [T; N] serde-rs/serde#1937 (comment). I have a struct

pub struct Line<const N: usize> {
    #[serde_as(as = "Vec<ArrayVisitor>")]
    pub points: Vec<[f64; N]>
}

The ArrayVisitor:

 struct ArrayVisitor<T, const N: usize>(PhantomData<T>);

When i try to compile I get the following issue:

note: struct defined here, with 2 generic parameters: `T`, `N`
  --> src/de_array.rs:22:16
   |
22 |     pub struct ArrayVisitor<T, const N: usize>(PhantomData<T>);
   |                ^^^^^^^^^^^^ -  --------------
   = note: this error originates in the attribute macro `serde_as` (in Nightly builds, run with -Z macro-backtrace for more info)
help: add missing generic arguments
   |
22 | #[serde_as]<T, N>
   |            ++++++

How can I pass in the generic types or avoid this?

[jonasbb]

You can specify the generic types on the ArrayVisitor as usual. Something like this:

#[serde_as(as = "Vec<ArrayVisitor<f64, N>>")]

The correct values depend on your SerializeAs trait implementation, that you did not provide here.