33 lines
493 B
Rust
33 lines
493 B
Rust
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// check-pass
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#![feature(dyn_star)]
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#![allow(incomplete_features)]
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trait AddOne {
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fn add1(&mut self) -> usize;
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}
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impl AddOne for usize {
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fn add1(&mut self) -> usize {
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*self += 1;
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*self
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}
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}
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impl AddOne for &mut usize {
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fn add1(&mut self) -> usize {
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(*self).add1()
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}
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}
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fn add_one(mut i: dyn* AddOne + '_) -> usize {
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i.add1()
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}
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fn main() {
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let mut x = 42usize;
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let y = &mut x as (dyn* AddOne + '_);
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println!("{}", add_one(y));
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}
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