test/ClangImporter/Inputs/enum-objc.h

@import Foundation;

#define SWIFT_COMPILE_NAME(X) __attribute__((swift_name(X)))
#define SWIFT_ENUM_NAMED(_type, _name, SWIFT_NAME) enum _name : _type _name SWIFT_COMPILE_NAME(SWIFT_NAME); enum SWIFT_COMPILE_NAME(SWIFT_NAME) __attribute__((enum_extensibility(open))) SWIFT_ENUM_EXTRA _name : _type

typedef SWIFT_ENUM_NAMED(NSInteger, ObjCEnum, "SwiftEnum") {
    ObjCEnumOne = 1,
    ObjCEnumTwo,
    ObjCEnumThree
};