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void Main()
{
    GetTypeFromList(new List<string>()).Dump();
    GetTypeFromFunc((string s, int i) => true).Dump();
}

public Type GetTypeFromList<TType>(IEnumerable<TType> dummy)
{
    return typeof(TType);
}

public Type[] GetTypeFromFunc<T1, T2, TOut>(Func<T1, T2, TOut> dummy)
{
    return new [] { typeof(T1), typeof(T2), typeof(TOut) };
}