File: rustc_must_implement_one_of_gated.stderr

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error[E0658]: the `#[rustc_must_implement_one_of]` attribute is used to change minimal complete definition of a trait, it's currently in experimental form and should be changed before being exposed outside of the std
  --> $DIR/rustc_must_implement_one_of_gated.rs:1:1
   |
LL | #[rustc_must_implement_one_of(eq, neq)]
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: add `#![feature(rustc_attrs)]` 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   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date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: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0658`.