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// CS0738: `C' does not implement interface member `I2.Key.get' and the best implementing candidate `C.Key.get' return type `IB' does not match interface member return type `IA'
// Line: 22
public interface I1
{
IB Key { get; }
}
public interface I2
{
IA Key { get; }
}
public interface IB : IA
{
}
public interface IA
{
}
public class C : I1, I2
{
public IB Key { get { return null; } }
}