File: specialization_trait.rs

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rustc 1.87.0%2Bdfsg1-1
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// Test that `rustc_specialization_trait` requires always applicable impls.

#![feature(min_specialization)]
#![feature(rustc_attrs)]

#[rustc_specialization_trait]
trait SpecMarker {
    fn f();
}

impl SpecMarker for &'static u8 {
    //~^ ERROR cannot specialize
    fn f() {}
}

impl<T> SpecMarker for (T, T) {
    //~^ ERROR specializing impl
    fn f() {}
}

impl<T: Clone> SpecMarker for [T] {
    //~^ ERROR cannot specialize
    fn f() {}
}

fn main() {}