Partial dynamic dispatch

dyn.rs

trait Dump {
	fn dump(&self);
}
struct A {
	a: i32
}
impl Dump for A {
	fn dump(&self) {
		println!("{}", self.a);
	}
}
fn dumpab<T: Dump+?Sized, S: Dump+?Sized>(a: &T, b: &S) {
	a.dump();
	b.dump();
}
fn main() {
	let a = A {a: 1};
	let b = A {a: 2};
	dumpab(&a, &b as &Dump);
}