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22 lines
424 B
Rust
22 lines
424 B
Rust
// run-pass
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// Fast path, main can see the concrete type returned.
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fn before() -> impl FnMut(i32) {
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let mut p = Box::new(0);
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move |x| *p = x
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}
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fn send<T: Send>(_: T) {}
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fn main() {
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send(before());
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send(after());
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}
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// Deferred path, main has to wait until typeck finishes,
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// to check if the return type of after is Send.
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fn after() -> impl FnMut(i32) {
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let mut p = Box::new(0);
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move |x| *p = x
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}
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