mirror of https://github.com/rust-lang/rust
30 lines
824 B
Rust
30 lines
824 B
Rust
// Some unusual code minimized from
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// https://github.com/sile/handy_async/tree/7b619b762c06544fc67792c8ff8ebc24a88fdb98
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pub trait Pattern {
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type Value;
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}
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pub struct Constrain<A, B = A, C = A>(A, B, C);
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impl<A, B, C> Pattern for Constrain<A, B, C>
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where A: Pattern,
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B: Pattern<Value = A::Value>,
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C: Pattern<Value = A::Value>,
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{
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type Value = A::Value;
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}
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pub struct Wrapper<T>(T);
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impl<T> Pattern for Wrapper<T> {
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type Value = T;
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}
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//@ has self_referential/struct.WriteAndThen.html
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//@ has - '//*[@id="synthetic-implementations-list"]//*[@class="impl"]//h3[@class="code-header"]' \
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// "impl<P1> Send for WriteAndThen<P1>where <P1 as Pattern>::Value: Send"
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pub struct WriteAndThen<P1>(pub P1::Value,pub <Constrain<P1, Wrapper<P1::Value>> as Pattern>::Value)
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where P1: Pattern;
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