22 lines
550 B
Rust
22 lines
550 B
Rust
// run-pass
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// Tests "capabilities" granted by traits that inherit from super-
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// builtin-kinds, e.g., if a trait requires Send to implement, then
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// at usage site of that trait, we know we have the Send capability.
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use std::sync::mpsc::{channel, Sender, Receiver};
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trait Foo : Send { }
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impl <T: Send> Foo for T { }
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fn foo<T: Foo + 'static>(val: T, chan: Sender<T>) {
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chan.send(val).unwrap();
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}
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pub fn main() {
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let (tx, rx): (Sender<isize>, Receiver<isize>) = channel();
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foo(31337, tx);
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assert_eq!(rx.recv().unwrap(), 31337);
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}
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