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error[E0658]: use of unstable library feature 'core_intrinsics': intrinsics are unlikely to ever be stabilized, instead they should be used through stabilized interfaces in the rest of the standard library
--> $DIR/expand-to-unstable.rs:8:10
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LL | #[derive(Unstable)]
| ^^^^^^^^
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= help: add `#![feature(core_intrinsics)]` to the crate attributes to enable
= note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
= note: this error originates in the derive macro `Unstable` (in Nightly builds, run with -Z macro-backtrace for more info)
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0658`.
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