@objc public class Bar: NSObject {
    var x: Int = 3
}

#import <Foundation/Foundation.h>
#import <ExampleProduct-Swift.h>

void doStuff() {
    Bar *y = [[Bar alloc] init];
    printf("%ldn", (long)y.x);
}

% cd ~/Library/Developer/Xcode; find . -name '*-Swift.h'

./DerivedData/ExampleProduct-avoxifngmebkkqgndldocildsfcm/Build/Intermediates/ExampleProduct.build/Debug-iphonesimulator/ExampleProduct.build/DerivedSources/ExampleProduct-Swift.h
./DerivedData/ExampleProduct-avoxifngmebkkqgndldocildsfcm/Build/Intermediates/ExampleProduct.build/Debug-iphonesimulator/ExampleProduct.build/Objects-normal/x86_64/ExampleProduct-Swift.h
./DerivedData/ExampleProduct-avoxifngmebkkqgndldocildsfcm/Build/Intermediates/ExampleProduct.build/Debug-iphonesimulator/ExampleProductTests.build/DerivedSources/ExampleProductTests-Swift.h
./DerivedData/ExampleProduct-avoxifngmebkkqgndldocildsfcm/Build/Intermediates/ExampleProduct.build/Debug-iphonesimulator/ExampleProductTests.build/Objects-normal/x86_64/ExampleProductTests-Swift.h