[swift-evolution] Immutable Structures

[T.J. Usiyan]

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> I don’t understand why we need the `mutating` keyword in the first place.
> Is it for readability? Right now the compiler knows when a function mutates
> a property and forces us to write `mutating`. Couldn’t it just fail
> compiling when try to call a mutation function but we’re not allowed?
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I strongly disagree with this sentiment. I agree that the compiler can
figure it out without us in many cases but I appreciate knowing
*explicitly* which parts of an API will mutate a value. It is helpful for
both the vendor and consumer of the API to require that keyword.
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