Unstable feature generic_const_items syntax is not recognized

[gastrodon]

Not so sure if this fits better as a bug or a feature request ( since, rust-analyzer isn't guaranteed to work with unstable features ), but I figure I'd put this here since no other issues mention it.

The syntax for generic_const_items appears as a syntax error when code is looked at by rust-analyzer.

A reproducible example: This compiles with the latest nightly rustc 1.87.0-nightly (227690a25 2025-03-16), but rust-analyzer ( in vscodium ) complains about syntax errors on lines 6 expected SEMICOLON and 7 expected an item

#![feature(generic_const_exprs)]
#![feature(generic_const_items)]

trait A {
    const NUMBER: usize;
    const ARRAY: [u64; Self::NUMBER]
        where [(); Self::NUMBER]:;
}

fn main() {}