mirror of https://github.com/rust-lang/rust
36 lines
480 B
Rust
36 lines
480 B
Rust
//@ check-pass
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trait Mirror {
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type Other;
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}
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#[derive(Debug)]
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struct Even(usize);
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struct Odd;
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impl Mirror for Even {
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type Other = Odd;
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}
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impl Mirror for Odd {
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type Other = Even;
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}
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trait Dyn<T: Mirror>: AsRef<<T as Mirror>::Other> {}
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impl Dyn<Odd> for Even {}
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impl AsRef<Even> for Even {
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fn as_ref(&self) -> &Even {
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self
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}
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}
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fn code<T: Mirror>(d: &dyn Dyn<T>) -> &T::Other {
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d.as_ref()
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}
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fn main() {
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println!("{:?}", code(&Even(22)));
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}
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