test/SILGen/Inputs/usr/include/newtype.h

@import Foundation;

typedef NSString *_Nonnull SNTErrorDomain __attribute((swift_newtype(struct)))
__attribute((swift_name("ErrorDomain")));
extern const SNTErrorDomain SNTErrTwo;
extern const SNTErrorDomain SNTErrorDomainThree;
extern const SNTErrorDomain SNTFourErrorDomain;

typedef NSInteger MyInt __attribute((swift_newtype(struct)));

typedef NSString *MyString __attribute__((swift_newtype(struct)));