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error[E0658]: use of an internal attribute
--> $DIR/rustc_must_implement_one_of_gated.rs:1:1
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LL | #[rustc_must_implement_one_of(eq, neq)]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= help: add `#![feature(rustc_attrs)]` to the crate attributes to enable
= note: the `#[rustc_must_implement_one_of]` attribute is an internal implementation detail that will never be stable
= note: the `#[rustc_must_implement_one_of]` attribute is used to change minimal complete definition of a trait. Its syntax and semantics are highly experimental and will be subject to change before stabilization
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0658`.
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