tests/ui/diagnostic_namespace/non_existing_attributes_accepted.rs

//@ check-pass
//@ reference: attributes.diagnostic.namespace.unknown-invalid-syntax
#[diagnostic::non_existing_attribute]
//~^WARN unknown diagnostic attribute
pub trait Bar {
}

#[diagnostic::non_existing_attribute(with_option = "foo")]
//~^WARN unknown diagnostic attribute
struct Foo;

fn main() {
}