Rust suggests unstable paths for non-imported item

[carbotaniuman]

pub fn main() {
    println!("{}", size_of_val(&5))
}

(Playground)

   Compiling playground v0.0.1 (/playground)
error[E0425]: cannot find function `size_of_val` in this scope
 --> src/main.rs:2:20
  |
2 |     println!("{}", size_of_val(&5))
  |                    ^^^^^^^^^^^ not found in this scope
  |
help: consider importing one of these items
  |
1 | use core::intrinsics::size_of_val;
  |
1 | use core::mem::size_of_val;
  |
1 | use futures_core::core_reexport::intrinsics::size_of_val;
  |
1 | use futures_core::core_reexport::mem::size_of_val;
  |
    and 7 other candidates

error: aborting due to previous error

For more information about this error, try `rustc --explain E0425`.
error: could not compile `playground`.

To learn more, run the command again with --verbose.

I expected rustc to only show me paths that are stable if I'm on a stable compiler, but I also get suggestions to intrinsics.

[fmease]

Triage 2024: While we're now much better at considering the stability of items when suggesting things, apparently this specific diagnostic still doesn't.

Since core::mem::size_of{,val} is now part of the prelude, here is a new MCVE:

fn main() {
    let _ = assert_zero_valid::<()>();
}

error[E0425]: cannot find function `assert_zero_valid` in this scope
 --> imp.rs:2:13
  |
2 |     let _ = assert_zero_valid::<()>();
  |             ^^^^^^^^^^^^^^^^^ not found in this scope
  |
help: consider importing this function
  |
1 + use std::intrinsics::assert_zero_valid;
  |