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https://github.com/rust-lang/rust
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15 lines
233 B
Rust
15 lines
233 B
Rust
// run-pass
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trait Foo: Fn(i32) -> i32 + Send {}
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impl<T: ?Sized + Fn(i32) -> i32 + Send> Foo for T {}
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fn wants_foo(f: Box<dyn Foo>) -> i32 {
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f(42)
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}
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fn main() {
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let f = Box::new(|x| x);
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assert_eq!(wants_foo(f), 42);
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}
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