| // run-pass |
| // Tests for RFC 1268: we allow overlapping impls of marker traits, |
| // that is, traits without items. In this case, a type `T` is |
| // `MyMarker` if it is either `Debug` or `Display`. |
| |
| #![feature(overlapping_marker_traits)] |
| #![feature(optin_builtin_traits)] |
| |
| use std::fmt::{Debug, Display}; |
| |
| trait MyMarker {} |
| |
| impl<T: Debug> MyMarker for T {} |
| impl<T: Display> MyMarker for T {} |
| |
| fn foo<T: MyMarker>(t: T) -> T { |
| t |
| } |
| |
| fn main() { |
| // Debug && Display: |
| assert_eq!(1, foo(1)); |
| assert_eq!(2.0, foo(2.0)); |
| |
| // Debug && !Display: |
| assert_eq!(vec![1], foo(vec![1])); |
| } |
