I have the following `typealias` on a lambda: ``` ...

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[Davide Giuseppe Farella]

I have the following typealias on a lambda:

typealias ErrorStateGenerator = ErrorStateFactory.(Throwable) -> ViewState.Error

ErrorStateFactory provides a default val.
This is a typical use case:

ViewStateStoreConfig.errorStateGenerator = {
    when( it ) {
        is NullPointerException -> NPError( it )
        is IllegalArgumentException -> IAError( it )
        else -> default
    }
}

I was wondering a common scenario where the user only got some dependencies ( exceptions ) in certain modules, so this would be helpful:

ViewStateStoreConfig.errorStateGenerator = 
        generatorFromThisModule + generatorFromModule2 + generatorFromModule3

So I would need a class for wraps the `ErrorStateGenerator`s; this class should extend ErrorStateGenerator itself, but is not possible since ErrorStateGenerator is an extension function…
Which solution would you suggest?