File: custom-on-unimplemented-diagnostic.rs

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rustc 1.87.0%2Bdfsg1-1
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//@ reference: attributes.diagnostic.on_unimplemented.intro
//@ reference: attributes.diagnostic.on_unimplemented.keys
#[diagnostic::on_unimplemented(message = "my message", label = "my label", note = "my note")]
pub trait ProviderLt {}

pub trait ProviderExt {
    fn request<R>(&self) {
        todo!()
    }
}

impl<T: ?Sized + ProviderLt> ProviderExt for T {}

struct B;

fn main() {
    B.request();
    //~^ my message [E0599]
    //~| my label
    //~| my note
}