generic Self types are currently not permitted in anonymous constants

[Dushistov]

Code bellow cause compilation error:

error: generic `Self` types are currently not permitted in anonymous constants
  --> src/main.rs:15:27
   |
15 |     pub id: ArrayString<{ Self::FIX_ID_MAX_LEN }>,
   |                           ^^^^
   |
note: not a concrete type

Without #[derive(Deserialize)] it compiled and work just fine.

use arrayvec::ArrayString;
use serde::Deserialize;

#[derive(Deserialize)]
pub struct Foo {
    pub id: ArrayString<{ Self::FIX_ID_MAX_LEN }>,
}

impl Foo {
    pub const FIX_ID_MAX_LEN: usize = 20;
}

serde 1.0.210, rustc 1.82.0-beta.1, arrayvec 0.7.6

[appetrosyan]

Can confirm.

Related upstream issue in Rust

rust-lang/rust#68436