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@swift-5.8.1 class Box<T> { private var value: T init(_ value: T) { self.value = value } func mutate(_ mutation: (inout T) -> Void) { mutation(&self.value) } } func f() { let box = Box { } let s = "meow" box.mutate { value in value = { s } } } f()
swift58 BOT 4/24/2023 9:05 PM
<stdin>:22:13: warning: expression of type 'String' is unused s ^