mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-01 06:51:58 +00:00
40 lines
1.2 KiB
Rust
40 lines
1.2 KiB
Rust
use std::cell::Cell;
|
|
use std::rc::Rc;
|
|
|
|
// Fast path, main can see the concrete type returned.
|
|
fn before() -> impl Fn(i32) {
|
|
//~^ NOTE within this `impl Fn
|
|
//~| NOTE within the type `impl Fn
|
|
//~| NOTE expansion of desugaring
|
|
let p = Rc::new(Cell::new(0));
|
|
move |x| p.set(x) //~ NOTE used within this closure
|
|
}
|
|
|
|
fn send<T: Send>(_: T) {}
|
|
//~^ NOTE required by a bound
|
|
//~| NOTE required by a bound
|
|
//~| NOTE required by this bound
|
|
//~| NOTE required by this bound
|
|
|
|
fn main() {
|
|
send(before());
|
|
//~^ ERROR `Rc<Cell<i32>>` cannot be sent between threads safely
|
|
//~| NOTE `Rc<Cell<i32>>` cannot be sent between threads safely
|
|
//~| NOTE required by a bound
|
|
|
|
send(after());
|
|
//~^ ERROR `Rc<Cell<i32>>` cannot be sent between threads safely
|
|
//~| NOTE `Rc<Cell<i32>>` cannot be sent between threads safely
|
|
//~| NOTE required by a bound
|
|
}
|
|
|
|
// Deferred path, main has to wait until typeck finishes,
|
|
// to check if the return type of after is Send.
|
|
fn after() -> impl Fn(i32) {
|
|
//~^ NOTE within this `impl Fn(i32)`
|
|
//~| NOTE in this expansion
|
|
//~| NOTE appears within the type
|
|
let p = Rc::new(Cell::new(0));
|
|
move |x| p.set(x) //~ NOTE used within this closure
|
|
}
|