rust/tests/ui/specialization/min_specialization/spec-marker-supertraits.rs

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// Check that supertraits cannot be used to work around min_specialization
// limitations.
#![feature(min_specialization)]
#![feature(rustc_attrs)]
trait HasMethod {
fn method(&self);
}
#[rustc_unsafe_specialization_marker]
trait Marker: HasMethod {}
trait Spec {
fn spec_me(&self);
}
impl<T> Spec for T {
default fn spec_me(&self) {}
}
impl<T: Marker> Spec for T {
//~^ ERROR cannot specialize on trait `HasMethod`
fn spec_me(&self) {
self.method();
}
}
fn main() {}