rust/tests/ui/specialization/auxiliary/specialization_cross_crate.rs

#![feature(specialization)]

pub trait Foo {
    fn foo(&self) -> &'static str;
}

impl<T> Foo for T {
    default fn foo(&self) -> &'static str {
        "generic"
    }
}

impl<T: Clone> Foo for T {
    default fn foo(&self) -> &'static str {
        "generic Clone"
    }
}

impl<T, U> Foo for (T, U) where T: Clone, U: Clone {
    default fn foo(&self) -> &'static str {
        "generic pair"
    }
}

impl<T: Clone> Foo for (T, T) {
    default fn foo(&self) -> &'static str {
        "generic uniform pair"
    }
}

impl Foo for (u8, u32) {
    default fn foo(&self) -> &'static str {
        "(u8, u32)"
    }
}

impl Foo for (u8, u8) {
    default fn foo(&self) -> &'static str {
        "(u8, u8)"
    }
}

impl<T: Clone> Foo for Vec<T> {
    default fn foo(&self) -> &'static str {
        "generic Vec"
    }
}

impl Foo for Vec<i32> {
    fn foo(&self) -> &'static str {
        "Vec<i32>"
    }
}

impl Foo for String {
    fn foo(&self) -> &'static str {
        "String"
    }
}

impl Foo for i32 {
    fn foo(&self) -> &'static str {
        "i32"
    }
}

pub trait MyMarker {}
impl<T: Clone + MyMarker> Foo for T {
    default fn foo(&self) -> &'static str {
        "generic Clone + MyMarker"
    }
}