rust/tests/ui/feature-gates/feature-gate-register_tool....

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error[E0658]: the `#[register_tool]` attribute is an experimental feature
--> $DIR/feature-gate-register_tool.rs:1:1
|
LL | #![register_tool(tool)]
| ^^^^^^^^^^^^^^^^^^^^^^^
|
= note: see issue #66079 <https://github.com/rust-lang/rust/issues/66079> for more information
= help: add `#![feature(register_tool)]` 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= note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date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`.