You aren't allowed to `use i32` or `use self::i32`

I tried the following code:

use i32 as B; // { dg-error "unresolved import .self::i32." }

fn main() -> isize {
    let i: i32 = 0 as i32;
    i as isize
}

What I expected:

TRS-E14 build $ rustc issue-3315-2.rs
error[E0432]: unresolved import `i32`
 --> issue-3315-2.rs:2:5
  |
2 | use i32 as B; // { dg-error "unresolved import .self::i32." }
  |     ^^^^^^^^ no `i32` in the root
  |
help: consider importing one of these items instead
  |
2 | use std::i32 as B; // { dg-error "unresolved import .self::i32." }
  |     ~~~~~~~~~~~~~
2 | use std::primitive::i32 as B; // { dg-error "unresolved import .self::i32." }
  |     ~~~~~~~~~~~~~~~~~~~~~~~~

What I got:
gccrs compiles this code with no error

Source: https://doc.rust-lang.org/reference/names/preludes.html, "These prelude names are not part of the module itself: they are implicitly queried during name resolution. For example, even though something like Box is in scope in every module, you cannot refer to it as self::Box because it is not a member of the current module."

Start with the minimal Rust reproduction in the issue and read the referenced Rust Reference sections on preludes and name resolution. Verify that use i32 and use self::i32 are rejected while ordinary i32 type usage remains valid; the expected result is an unresolved-import diagnostic.