1
internal delegate void VoidOut();
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3
internal delegate object ObjectOut();
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internal class Program
6
{
7
    private static void Main()
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    {
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        VoidOut voidOut = () => { };
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        ObjectOut objectOut = () => new object();
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        // It looks like covariance is Ok here.
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        voidOut = objectOut;
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        // Because when we invoke [void voidOut()], we are invoking [object objectOut()].
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        // The return value of [object objectOut()] can be just ignored.
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        voidOut();
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    }
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}

1
internal delegate void NoParameterIn();
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3
internal delegate void ObjectIn(object @object);
4

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internal class Program
6
{
7
    private static void Main()
8
    {
9
        NoParameterIn noParameterIn = () => { };
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        ObjectIn objectIn = (@object) => { };
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        // It looks like contravariance is Ok here.
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        objectIn = noParameterIn;
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        // Because when we invoke [void objectIn(object)], we are invoking [void noParameterIn()].
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        // The parameter of [void objectIn(object)] can be just ignored.
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        objectIn(new object());
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    }
19
}