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//@ reference: attributes.diagnostic.namespace.unknown-invalid-syntax
#![deny(unknown_or_malformed_diagnostic_attributes)]
#[diagnostic::onunimplemented]
//~^ERROR unknown diagnostic attribute
//~^^HELP an attribute with a similar name exists
trait X{}
#[diagnostic::un_onimplemented]
//~^ERROR unknown diagnostic attribute
//~^^HELP an attribute with a similar name exists
trait Y{}
#[diagnostic::on_implemented]
//~^ERROR unknown diagnostic attribute
//~^^HELP an attribute with a similar name exists
trait Z{}
fn main(){}
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