mirror of https://github.com/rust-lang/rust
38 lines
767 B
Rust
38 lines
767 B
Rust
//@ check-pass
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// Some trait with a function that returns a slice:
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pub trait AsSlice {
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type Element;
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fn as_slice(&self) -> &[Self::Element];
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}
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// Some type
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pub struct A<Cont>(Cont);
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// Here we say that if A wraps a slice, then it implements AsSlice
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impl<'a, Element> AsSlice for A<&'a [Element]> {
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type Element = Element;
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fn as_slice(&self) -> &[Self::Element] {
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self.0
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}
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}
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impl<Cont> A<Cont> {
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// We want this function to work
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pub fn failing<Coef>(&self)
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where
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Self: AsSlice<Element = Coef>,
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{
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self.as_ref_a().as_ref_a();
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}
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pub fn as_ref_a<Coef>(&self) -> A<&[<Self as AsSlice>::Element]>
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where
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Self: AsSlice<Element = Coef>,
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{
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A(self.as_slice())
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}
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}
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fn main() {}
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