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error[E0658]: the `#[pattern_complexity]` attribute is just used for rustc unit tests and will never be stable
--> $DIR/feature-gate-pattern-complexity.rs:3:1
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LL | #![pattern_complexity = "42"]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= 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= note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date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`.
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