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error[E0658]: use of an internal attribute
--> $DIR/feature-gate-pattern-complexity-limit.rs:3:1
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LL | #![pattern_complexity_limit = "42"]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= help: add `#![feature(rustc_attrs)]` to the crate attributes to enable
= note: the `#[pattern_complexity_limit]` attribute is an internal implementation detail that will never be stable
= note: the `#[pattern_complexity_limit]` attribute is used for rustc unit tests
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0658`.
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