18 lines
356 B
Rust
18 lines
356 B
Rust
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// compile-flags: -Ztrait-solver=next
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// check-pass
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use std::fmt::Display;
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use std::rc::Rc;
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fn mk<T: ?Sized>(t: Option<&T>) -> Rc<T> {
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todo!()
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}
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fn main() {
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let mut x = None;
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let y = mk(x);
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// Don't treat the line below as a unsize coercion `Rc<?0> ~> Rc<dyn Display>`
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let z: Rc<dyn Display> = y;
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x = Some(&1 as &dyn Display);
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}
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