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use std::cell::RefCell;
use std::rc::Rc;
trait Foo {
fn set(&mut self, v: Rc<RefCell<A>>);
}
struct B {
v: Option<Rc<RefCell<A>>>
}
impl Foo for B {
fn set(&mut self, v: Rc<RefCell<A>>)
{
self.v = Some(v);
}
}
struct A {
v: Box<dyn Foo + Send>,
}
fn main() {
let a = A {v: Box::new(B{v: None}) as Box<dyn Foo + Send>};
//~^ ERROR `Rc<RefCell<A>>` cannot be sent between threads safely
}
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