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Joe Savona
61b605f764
If you have a ref that the compiler doesn't know is a ref (say, a value returned from a custom hook) and try to assign its `.current = ...`, we currently fail with a generic error that hook return values are not mutable. However, an assignment to `.current` specifically is a very strong hint that the value is likely to be a ref. So in this PR, we track the reason for the mutation and if it ends up being an error, we use it to show an additional hint to the user. See the fixture for an example of the message.