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Chapter 15-05: Fix incorrect interpretation of compiler error #3501

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Apr 17, 2024
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Chapter 15-05: Fix incorrect interpretation of compiler error #3501

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7 changes: 4 additions & 3 deletions src/ch15-05-interior-mutability.md
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Expand Up @@ -191,9 +191,10 @@ However, there’s one problem with this test, as shown here:

We can’t modify the `MockMessenger` to keep track of the messages, because the
`send` method takes an immutable reference to `self`. We also can’t take the
suggestion from the error text to use `&mut self` instead, because then the
signature of `send` wouldn’t match the signature in the `Messenger` trait
definition (feel free to try and see what error message you get).
suggestion from the error text to use `&mut self` instead, because we are
testing an API and it's not a good idea to modify the API for the sole purpose
of testing. Usually, the test engineers do not have permission to modify the
API they're testing. Feel free to try and see what error message you get.

This is a situation in which interior mutability can help! We’ll store the
`sent_messages` within a `RefCell<T>`, and then the `send` method will be
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