Calling non-const function `core::slice::iter::<impl IntoIterator for &[u8]>::into_iter`

I didn't find a clear issue that was talking about that, and I'm clearly in the "nightly scape" of Rust here. I'm trying to build the following code (don't take attention to the possible unsafe part of this code, I omitted voluntary some part for better clarity):

Playground link:

#![feature(const_mut_refs)]
#![feature(const_for)]
#![feature(const_maybe_uninit_write)]
#![feature(effects)]

use core::mem::MaybeUninit;

#[must_use]
const fn from_slice_unchecked(from_slice: &[u8]) -> [MaybeUninit<u8>; 1]
{
    let mut vec = [MaybeUninit::uninit(); 1];

    for byte in from_slice {
        vec[0].write(*byte);
    }

    vec
}

fn main() {
    let _ = const { from_slice_unchecked(&[0]) };
}

error[E0080]: evaluation of `main::{constant#0}` failed
  --> src/main.rs:13:17
   |
13 |     for byte in from_slice {
   |                 ^^^^^^^^^^ calling non-const function `core::slice::iter::<impl IntoIterator for &[u8]>::into_iter`
   |
note: inside `from_slice_unchecked`
  --> src/main.rs:13:17
   |
13 |     for byte in from_slice {
   |                 ^^^^^^^^^^
note: inside `main::{constant#0}`
  --> src/main.rs:21:21
   |
21 |     let _ = const { from_slice_unchecked(&[0]) };
   |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^

note: erroneous constant encountered
  --> src/main.rs:21:13
   |
21 |     let _ = const { from_slice_unchecked(&[0]) };
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

For more information about this error, try `rustc --explain E0080`.

It does build if I don't const inline the call to from_slice_unchecked() though. But here, I'm wanted to create this buffer at build time and I don't find a way to do it "easily".

The closer issue I could find is https://github.com/rust-lang/rust/issues/103265 which contains this closed PR https://github.com/rust-lang/rust/pull/102225.

Reproduce the nightly example in the linked Playground and inspect the failure at src/main.rs line 13. Read issue #103265 and pull request #102225 for related context; done means the const-inline call can iterate over the slice without the reported non-const-function error.