@_private(sourceFile: "TestOpaque1.swift") import TestOpaque1 struct Pair : P { var x = 0 var y = 1 func myValue() -> Int{ return y } } @available(macOS 9999, iOS 9999, tvOS 9999, watchOS 9999, *) @_dynamicReplacement(for:bar(_:)) func _replacement_bar(y x: Int) -> some P { return Pair() } extension Container { @available(macOS 9999, iOS 9999, tvOS 9999, watchOS 9999, *) @_dynamicReplacement(for:bar(_:)) func _replacement_bar(y x: Int) -> some P { return Pair() } @available(macOS 9999, iOS 9999, tvOS 9999, watchOS 9999, *) @_dynamicReplacement(for: computedProperty) var _replacement_computedProperty : some P { get { return Pair() } set { print("replacement \(newValue)") } } @available(macOS 9999, iOS 9999, tvOS 9999, watchOS 9999, *) @_dynamicReplacement(for: subscript(_:)) subscript(y x: Int) -> some P { get { return Pair() } set { print("replacement \(newValue)") } } } extension Test { @available(macOS 9999, iOS 9999, tvOS 9999, watchOS 9999, *) @_dynamicReplacement(for: act) func act_r() -> some Q { return NewType() } }