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Add console output for Listing 15-29 in chapter 15 #4472

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Add console output for Listing 15-29 in chapter 15 #4472

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10 changes: 10 additions & 0 deletions src/ch15-06-reference-cycles.md
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Expand Up @@ -268,6 +268,16 @@ in Listing 15-29.

</Listing>

Then we will see the output:

```console
leaf strong = 1, weak = 0
branch strong = 1, weak = 1
leaf strong = 2, weak = 0
leaf parent = None
leaf strong = 1, weak = 0
```

After `leaf` is created, its `Rc<Node>` has a strong count of 1 and a weak
count of 0. In the inner scope, we create `branch` and associate it with
`leaf`, at which point when we print the counts, the `Rc<Node>` in `branch`
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