//@ run-pass #![feature(marker_trait_attr)] #![feature(specialization)] //~ WARN the feature `specialization` is incomplete #[marker] trait MyMarker {} impl MyMarker for T {} impl MyMarker for Vec {} fn foo(t: T) -> T { t } fn main() { assert_eq!(1, foo(1)); assert_eq!(2.0, foo(2.0)); assert_eq!(vec![1], foo(vec![1])); }