MSBuild is going cross-platform with .NET Core(blogs.msdn.com)

    public inline fun <T> Iterable<T>.filter(predicate: (T) -> Boolean): List<T> {
        // note how it's allocating a new ArrayList<T> - 
        // Kotlin doesn't have a "new" keyword, but it's initializing it here
        return filterTo(ArrayList<T>(), predicate)
    }

    public inline fun <T, C : MutableCollection<in T>> Iterable<T>.filterTo(destination: C, predicate: (T) -> Boolean): C {
        for (element in this) if (predicate(element)) destination.add(element)
        return destination
    }