23 lines
364 B
Rust
23 lines
364 B
Rust
// compile-flags: -Znext-solver
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// check-pass
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#![feature(trait_upcasting)]
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trait A {}
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trait B: A {}
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impl A for usize {}
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impl B for usize {}
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trait Mirror {
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type Assoc: ?Sized;
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}
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impl<T: ?Sized> Mirror for T {
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type Assoc = T;
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}
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fn main() {
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let x = Box::new(1usize) as Box<<dyn B as Mirror>::Assoc>;
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let y = x as Box<<dyn A as Mirror>::Assoc>;
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}
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