More move error suggestions to clone

```
error[E0507]: cannot move out of `val`, a captured variable in an `FnMut` closure
  --> $DIR/issue-87456-point-to-closure.rs:10:28
   |
LL |     let val = String::new();
   |         --- captured outer variable
LL |
LL |     take_mut(|| {
   |              -- captured by this `FnMut` closure
LL |
LL |         let _foo: String = val;
   |                            ^^^ move occurs because `val` has type `String`, which does not implement the `Copy` trait
   |
help: consider borrowing here
   |
LL |         let _foo: String = &val;
   |                            +
help: consider cloning the value if the performance cost is acceptable
   |
LL |         let _foo: String = val.clone();
   |                               ++++++++
```

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