Suggested fix for "cannot find macro ... in this scope" does not compile

[rusty-snake]

I tried this code: https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=a095133990477eb48c9b42343e5593f4

fn main() {}

// STEP 1: Try to compile, will fail with "error: cannot find macro `nothing` in this scope".
// STEP 2: Uncomment line 18 as per suggestion.
// STEP 3: Try to compile, will fail with "macro-expanded `macro_export` macros from the current crate cannot be referred to by absolute paths".
// STEP 4: Comment line 9.

mod a {
    #[rustfmt::skip]
    #[macro_export]
    macro_rules! nothing {
        () => {};
    }
}

mod b {
    fn foo() {
        //use crate::nothing;
        nothing!();
    }
}

I expected to see this happen: Using a suggestion "just works".

Instead, this happened: Unexpected and even more confusing error message caused because of #98291.

Meta

Tested on playground with 1.84.0 (stable) and 1.86.0-nightly (2025-01-26 f85c6de55206dbee5ffe).

[lolbinarycat]

tried to find a workaround and found an even more broken diagnostic instead

mod a {
    #[rustfmt::skip]
    #[macro_export]
    macro_rules! nothing {
        () => {};
    }
}

mod b {
    fn foo() {
        use crate::a::nothing;
        nothing!();
    }
}

error[E0432]: unresolved import `crate::a::nothing`
  --> src/lib.rs:11:13
   |
11 |         use crate::a::nothing;
   |             ^^^^^^^^^^^^^^^^^ no `nothing` in `a`
   |
   = note: this could be because a macro annotated with `#[macro_export]` will be exported at the root of the crate instead of the module where it is defined
help: a macro with this name exists at the root of the crate
   |
11 |         use ::nothing;
   |             ~~~~~~~~~

For more information about this error, try `rustc --explain E0432`.