order of top level items is relevant with const fn

[oli-obk]

This code wrongly states "expected constant integer for repeat count, but non-constant path in constant expression"

#![feature(const_fn)]
struct A {
    field: usize,
}
const fn f() -> usize {
    5
}
fn main() {
    let _ = [0; f()];
}

This one works

#![feature(const_fn)]
const fn f() -> usize {
    5
}
struct A {
    field: usize,
}
fn main() {
    let _ = [0; f()];
}

[oli-obk]

accidentally fixed in #30084