File: feature-gate-on-unimplemented.rs

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rustc 1.88.0%2Bdfsg1-2
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// Test that `#[rustc_on_unimplemented]` is gated by `rustc_attrs` feature gate.

#[rustc_on_unimplemented = "test error `{Self}` with `{Bar}`"]
//~^ ERROR this is an internal attribute that will never be stable
trait Foo<Bar>
{}

fn main() {}