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error: cannot find attribute `empty_helper` in this scope
--> $DIR/derive-helper-legacy-limits.rs:17:3
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LL | #[empty_helper]
| ^^^^^^^^^^^^
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help: `empty_helper` is an attribute that can be used by the derive macro `Empty`, you might be missing a `derive` attribute
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LL + #[derive(Empty)]
LL | struct S2;
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error: aborting due to 1 previous error
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