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kotlinlang

Hello,

When compiling for mac (using `./gradlew linkNative`) I get an error when I return `null` in a function, such as:
```// commonMain
interface GetManufacturerUseCase {
    operator fun invoke(): String?
}```
```// nativeMain
class GetManufacturerUseCaseImpl : GetManufacturerUseCase {
    override fun invoke() = null
}```
It produces this error
```/var/folders/v4/tsnbm2mj12qcqd5mzx022z0m0000gp/T/konan_temp15915856283221827637/api.cpp:482:21: error: unknown type name 'libNative_kref_kotlin_Nothing'; did you mean 'libNative_kref_kotlin_Long'?
                    libNative_kref_kotlin_Nothing (*invoke)(libNative_kref_com_me_myproject_deviceInfo_domain_usecase_GetManufacturerUseCaseImpl thiz);
                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                    libNative_kref_kotlin_Long```
To fix it, I return an empty string :confused: But that’s not really what I want.

Is this a bug, or a limitation?

have you tried
```override fun invoke(): String? = null```
? the `null` is inferred to be `Nothing?` if not given a narrower type, and it seems that isn't interoperable

Thanks <@UJQB4DJF7>, that was it. It worked.

Since it was working on iOS targets, I assume it would be the case here too. Thanks again!