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// check-pass
#![allow(dead_code)]
// This test ensures that each pointer type `P<X>` is covariant in `X`.
use std::rc::Rc;
use std::sync::Arc;
fn a<'r>(x: Box<&'static str>) -> Box<&'r str> {
x
}
fn b<'r, 'w>(x: &'w &'static str) -> &'w &'r str {
x
}
fn c<'r>(x: Arc<&'static str>) -> Arc<&'r str> {
x
}
fn d<'r>(x: Rc<&'static str>) -> Rc<&'r str> {
x
}
fn main() {}
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