How to use testOptionalSubscriptGetterGlobalForwarding method of ObjCProtocolFake class

...187    XCTAssertTrue(protocolInstance.optionalProperty ?? false)188    verify(protocolMock.optionalProperty).wasCalled()189  }190  191  func testOptionalSubscriptGetterGlobalForwarding() {192    protocolMock.forwardCalls(to: protocolFake)193    XCTAssertTrue(protocolInstance[1] ?? false)194    verify(protocolMock[any()]).wasCalled()195  }196  func testOptionalSubscriptGetterLocalForwarding() {197    given(protocolMock[any()]).willForward(to: protocolFake)198    XCTAssertTrue(protocolInstance[1] ?? false)199    verify(protocolMock[any()]).wasCalled()200  }201}...

1let obj = ObjCProtocolFake()2let obj = ObjCProtocolFake()3let obj = ObjCProtocolFake()4let obj = ObjCProtocolFake()5extension ObjCProtocolFake {6    func testOptionalSubscriptGetterGlobalForwarding() -> Int? {

1let obj = ObjCProtocolFake()2obj.testOptionalSubscriptGetterGlobalForwarding()3extension ObjCProtocolFake {4    func testOptionalSubscriptGetterGlobalForwarding() {5    }6}7extension ObjCProtocolFake {8    subscript(index: Int) -> Int {9    }10}11extension ObjCProtocolFake {12    subscript(index: Int) -> String {13    }14}15extension ObjCProtocolFake {16    subscript(index: Int) -> Double {17    }18}19extension ObjCProtocolFake {20    subscript(index: Int) -> Float {21    }22}23extension ObjCProtocolFake {24    subscript(index: Int) -> UInt {25    }26}27extension ObjCProtocolFake {28    subscript(index: Int) -> Bool {29    }30}31extension ObjCProtocolFake {32    subscript(index: Int) -> Character {33    }34}35extension ObjCProtocolFake {36    subscript(index: Int) -> Int8 {37    }38}39extension ObjCProtocolFake {40    subscript(index: Int) -> Int16 {41    }42}43extension ObjCProtocolFake {44    subscript(index: Int) -> Int32 {

1testOptionalSubscriptGetterGlobalForwarding!([1, 2, 3])2testOptionalSubscriptGetterGlobalForwarding!([1, 2, 3])3public extension String {4    public var urlEncoded: String {5        return self.addingPercentEncoding(withAllowedCharacters: .urlHostAllowed)!6    }7    public var urlQueryEncoded: String {8        return self.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed)!9    }10}11public extension String {12    public var urlEncoded: String {13        return self.addingPercentEncoding(with

1let obj: ObjCProtocolFake = ObjCProtocolFake()2let result = obj.testOptionalSubscriptGetterGlobalForwarding(0)3print(result)4let obj: ObjCProtocolFake = ObjCProtocolFake()5let result = obj.testOptionalSubscriptGetterGlobalForwarding(0)6print(result)7The issue is not reproducible on the latest Xcode 12.5.1 (12E507) and Xcode 13 beta 4 (13A5155h) with Swift 5.4.2 on macOS 11.4 (20F71) and macOS 12.0 beta (21A5268h) if the code is compiled with