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Timer should embrace temporal mutability #1062
Description
A type needs temporal mutable field when it is participating in a reference cycle with the other type.
struct A {
mutable_field: Option<Weak<Box<B>>>,
}
struct B {
cycle: Rc<Box<A>>
}
let mut a = Rc::new(Box::new(A { mutable_field: None }));
let b = Rc::new(Box::new(B { cycle: a }));
a.mutable_field = Some(b.downgrade());Previously, The Timer was like B. But it should be changed to be like A
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