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https://github.com/rust-lang/rust
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22 lines
559 B
Rust
22 lines
559 B
Rust
//@ run-pass
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#![allow(unused_variables)]
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pub trait Parameters { type SelfRef; }
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struct RP<'a> { _marker: std::marker::PhantomData<&'a ()> }
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struct BP;
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impl<'a> Parameters for RP<'a> { type SelfRef = &'a X<RP<'a>>; }
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impl Parameters for BP { type SelfRef = Box<X<BP>>; }
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pub struct Y;
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pub enum X<P: Parameters> {
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Nothing,
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SameAgain(P::SelfRef, Y)
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}
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fn main() {
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let bnil: Box<X<BP>> = Box::new(X::Nothing);
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let bx: Box<X<BP>> = Box::new(X::SameAgain(bnil, Y));
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let rnil: X<RP> = X::Nothing;
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let rx: X<RP> = X::SameAgain(&rnil, Y);
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}
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