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