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40 lines
1.2 KiB
Rust
40 lines
1.2 KiB
Rust
use std::cell::Cell;
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use std::rc::Rc;
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// Fast path, main can see the concrete type returned.
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fn before() -> impl Fn(i32) {
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//~^ NOTE within this `impl Fn
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//~| NOTE within the type `impl Fn
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//~| NOTE expansion of desugaring
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let p = Rc::new(Cell::new(0));
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move |x| p.set(x) //~ NOTE used within this closure
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}
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fn send<T: Send>(_: T) {}
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//~^ NOTE required by a bound
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//~| NOTE required by a bound
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//~| NOTE required by this bound
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//~| NOTE required by this bound
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fn main() {
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send(before());
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//~^ ERROR `Rc<Cell<i32>>` cannot be sent between threads safely
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//~| NOTE `Rc<Cell<i32>>` cannot be sent between threads safely
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//~| NOTE required by a bound
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send(after());
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//~^ ERROR `Rc<Cell<i32>>` cannot be sent between threads safely
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//~| NOTE `Rc<Cell<i32>>` cannot be sent between threads safely
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//~| NOTE required by a bound
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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 Fn(i32) {
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//~^ NOTE within this `impl Fn(i32)`
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//~| NOTE in this expansion
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//~| NOTE appears within the type
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let p = Rc::new(Cell::new(0));
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move |x| p.set(x) //~ NOTE used within this closure
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}
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