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Add test for #[doc(alias = "...")] at crate level
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#![feature(doc_alias)]
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#![doc(alias = "shouldn't work!")] //~ ERROR
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error: `#![doc(alias = "...")]` isn't allowed as a crate level attribute
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--> $DIR/doc-alias-crate-level.rs:3:8
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|
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LL | #![doc(alias = "shouldn't work!")]
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| ^^^^^^^^^^^^^^^^^^^^^^^^^
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error: aborting due to previous error
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src/test/ui/doc-alias-crate-level.rs

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#![feature(doc_alias)]
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#![crate_type = "lib"]
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#![doc(alias = "shouldn't work!")] //~ ERROR
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error: `#![doc(alias = "...")]` isn't allowed as a crate level attribute
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--> $DIR/doc-alias-crate-level.rs:5:8
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|
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LL | #![doc(alias = "shouldn't work!")]
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| ^^^^^^^^^^^^^^^^^^^^^^^^^
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error: aborting due to previous error
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