regression: hashmap macro stuff

[BoxyUwU]

• https://crater-reports.s3.amazonaws.com/beta-1.91-2/beta-2025-09-21/gh/fwtn.aoc_23_rust/log.txt
• https://crater-reports.s3.amazonaws.com/beta-1.91-2/beta-2025-09-21/gh/ltpp-universe.std-macro-extensions/log.txt
• https://crater-reports.s3.amazonaws.com/beta-1.91-2/beta-2025-09-21/gh/Wtbg.rustexercise2/log.txt
• https://crater-reports.s3.amazonaws.com/beta-1.91-3/beta-2025-09-21/reg/clouseau-0.3.4/log.txt
• https://crater-reports.s3.amazonaws.com/beta-1.91-3/beta-2025-09-21/reg/dingusim-0.1.0/log.txt
• https://crater-reports.s3.amazonaws.com/beta-1.91-3/beta-2025-09-21/reg/macron-collections-0.1.3/log.txt
• https://crater-reports.s3.amazonaws.com/beta-1.91-3/beta-2025-09-21/reg/neo4j-0.2.0/log.txt
• https://crater-reports.s3.amazonaws.com/beta-1.91-3/beta-2025-09-21/reg/std-macro-extensions-0.26.5/log.txt
• https://crater-reports.s3.amazonaws.com/beta-1.91-3/beta-2025-09-21/reg/velcro-0.5.4/log.txt

[INFO] [stdout] error[E0659]: `hash_map` is ambiguous
[INFO] [stdout]   --> src/bin/day02-1.rs:49:17
[INFO] [stdout]    |
[INFO] [stdout] 49 |                 hash_map!(
[INFO] [stdout]    |                 ^^^^^^^^ ambiguous name
[INFO] [stdout]    |
[INFO] [stdout]    = note: ambiguous because of a conflict between a name from a glob import and an outer scope during import or macro resolution
[INFO] [stdout]    = note: `hash_map` could refer to a macro from prelude

[INFO] [stdout] error[E0658]: use of unstable library feature `hash_map_macro`
[INFO] [stdout]  --> src/hash_map/cfg.rs:4:38
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let my_map: HashMap<&str, i32> = hash_map!("a" => 1, "b" => 2);
[INFO] [stdout]   |                                      ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: see issue #144032 <https://github.com/rust-lang/rust/issues/144032> for more information

[theemathas]

Reproducer for the "ambiguous" error:

mod module {
    macro_rules! hash_map {
        () => {}
    }
    pub(crate) use hash_map;
}

use module::*;

fn main() {
    hash_map! {}
}

[theemathas]

Edit: This reproducer is wrong. Not sure what happened.

Reproducer for the "unstable feature" error:

mod module1 {
    #[macro_export]
    macro_rules! hash_map {
        () => {}
    }
}

mod module2 {
    use crate::*;
    fn foo() {
        hash_map! {}
    }
}

[theemathas]

Presumably regressed in #144070
cc @stifskere

[stifskere]

Presumably regressed in #144070 cc @stifskere

Hello, how should I approach this? Should I make a new pull request?

Thanks in advance

[theemathas]

@stifskere Probably make a PR that reverts your previous PR, and label it with "beta-nominated". You can re-add the macro in a later PR, with this issue fixed.