File: helper-attr-blocked-by-import-ambig.rs

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rustc 1.87.0%2Bdfsg1-1~bpo13%2B2
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//@ proc-macro: test-macros.rs

#[macro_use(Empty)]
extern crate test_macros;
use test_macros::empty_attr as empty_helper;

#[empty_helper] //~ ERROR `empty_helper` is ambiguous
                //~| WARN derive helper attribute is used before it is introduced
                //~| WARN this was previously accepted
#[derive(Empty)]
struct S;

fn main() {}