1 // check-pass 2 #![allow(dead_code)] 3 // This test ensures that each pointer type `P<X>` is covariant in `X`. 4 5 use std::rc::Rc; 6 use std::sync::Arc; 7 a<'r>(x: Box<&'static str>) -> Box<&'r str>8fn a<'r>(x: Box<&'static str>) -> Box<&'r str> { 9 x 10 } 11 b<'r, 'w>(x: &'w &'static str) -> &'w &'r str12fn b<'r, 'w>(x: &'w &'static str) -> &'w &'r str { 13 x 14 } 15 c<'r>(x: Arc<&'static str>) -> Arc<&'r str>16fn c<'r>(x: Arc<&'static str>) -> Arc<&'r str> { 17 x 18 } 19 d<'r>(x: Rc<&'static str>) -> Rc<&'r str>20fn d<'r>(x: Rc<&'static str>) -> Rc<&'r str> { 21 x 22 } 23 main()24fn main() {} 25