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|
// run-pass
trait Foo {
const X: i32;
fn get_x() -> i32 {
Self::X
}
}
struct Abc;
impl Foo for Abc {
const X: i32 = 11;
}
struct Def;
impl Foo for Def {
const X: i32 = 97;
}
struct Proxy<T>(#[allow(unused_tuple_struct_fields)] T);
impl<T: Foo> Foo for Proxy<T> {
const X: i32 = T::X;
}
fn sub<A: Foo, B: Foo>() -> i32 {
A::X - B::X
}
trait Bar: Foo {
const Y: i32 = Self::X;
}
fn main() {
assert_eq!(11, Abc::X);
assert_eq!(97, Def::X);
assert_eq!(11, Abc::get_x());
assert_eq!(97, Def::get_x());
assert_eq!(-86, sub::<Abc, Def>());
assert_eq!(86, sub::<Def, Abc>());
assert_eq!(-86, sub::<Proxy<Abc>, Def>());
assert_eq!(-86, sub::<Abc, Proxy<Def>>());
assert_eq!(86, sub::<Proxy<Def>, Proxy<Abc>>());
}
|
