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https://github.com/rust-lang/rust
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21 lines
286 B
Rust
21 lines
286 B
Rust
#![crate_type = "lib"]
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pub trait Future {
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type Item;
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type Error;
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}
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impl Future for u32 {
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type Item = ();
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type Error = Box<()>;
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}
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fn foo() -> Box<Future<Item=(), Error=Box<()>>> {
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Box::new(0u32)
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}
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pub fn bar<F, A, B>(_s: F)
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where F: Fn(A) -> B,
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{
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foo();
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}
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