I have just upgraded a workspace from 8 to 9.1. It has a mixture of Objective-C and Swift.I've gone through the changes to convert everything to Swift 4. The app builds and runs without error.When I try to run the unit tests, I receive a compile error in my <module_name>-Swift.h generated file.// Generated by Apple Swift version 4.0.2 (swiftlang-900.0.69.2 clang-900.0.38)#pragma clang diagnostic push#pragma clang diagnostic ignored -Wgcc-compat...#if __has_attribute(external_source_symbol)# define SWIFT_STRINGIFY(str) #str# define SWIFT_MODULE_NAMESPACE_PUSH(module_name) _Pragma(SWIFT_STRINGIFY(clang attribute push(__attribute__((external_source_symbol(language=Swift, defined_in=module_name, generated_declaration))), apply_to=any(function, enum, objc_interface, objc_category, objc_protocol))))# define SWIFT_MODULE_NAMESPACE_POP _Pragma(clang attribute pop)#else# define SWIFT_MODULE_NAMESPACE_PUSH(module_name)# define SWIFT_MODULE_NAMESPACE_POP#endif...SWIFT_MODULE_NAMESPACE_PUSH(<module_name