I'm a beginner, and I'm on Chapter 13.1 of the book. The following appears as a suggested exercise: Try modifying Cacher to hold a hash map rather than a single value. The keys of the hash map will be the arg values that are passed in, and the values of the hash map will be the result of calli…

The value v in the Some branch contains a borrowed reference into the hash map. Inserting into the map would invalidate this reference, so it is not allowed while the reference is alive. The compiler should see that the reference is not in scope in the None branch, and allow you to mutate the HashM…

Immutable borrow when using .get on hashmap

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alice August 26, 2020, 6:36pm 2

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Immutable borrow when using .get on hashmap

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