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error[E0658]: lang items are subject to change
--> $DIR/feature-gate-lang-items.rs:1:1
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LL | #[lang = "foo"]
| ^^^^^^^^^^^^^^^
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= help: add `#![feature(lang_items)]` to the crate attributes to enable
= note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
error[E0522]: definition of an unknown lang item: `foo`
--> $DIR/feature-gate-lang-items.rs:1:1
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LL | #[lang = "foo"]
| ^^^^^^^^^^^^^^^ definition of unknown lang item `foo`
error: aborting due to 2 previous errors
Some errors have detailed explanations: E0522, E0658.
For more information about an error, try `rustc --explain E0522`.
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