1 error[E0597]: `*a` does not live long enough
2 --> $DIR/destructor-restrictions.rs:8:10
4 LL | let a = Box::new(RefCell::new(4));
5 | - binding `a` declared here
9 | borrowed value does not live long enough
10 | a temporary with access to the borrow is created here ...
12 | -- ... and the borrow might be used here, when that temporary is dropped and runs the destructor for type `Ref<'_, i32>`
14 | `*a` dropped here while still borrowed
16 = note: the temporary is part of an expression at the end of a block;
17 consider forcing this temporary to be dropped sooner, before the block's local variables are dropped
18 help: for example, you could save the expression's value in a new local variable `x` and then make `x` be the expression at the end of the block
20 LL | let x = *a.borrow() + 1; x
23 error: aborting due to previous error
25 For more information about this error, try `rustc --explain E0597`.