@swift-5.6.3 @swift-5.5.3
import Foundation @propertyWrapper struct Wrapper { var wrappedValue: Int? var projectedValue: String? init(wrappedValue: Int?) { self.wrappedValue = wrappedValue } init(projectedValue: String?) { self.projectedValue = projectedValue } } func foo(@Wrapper value: Int?) { print(value) } foo(value: 100) foo($value: "string")