Error with class inheriting from generic interface twice

[starkcolin]

Version 4.6.1

When a class inherits from the same generic interface twice, an error message like below is shown:
The implementation type CGeneric'1 does not support the interface ISingleGenericWithInModifier'1.

The following test should pass:

public class TestClass
{
    public interface ISimpleInterface
    {
    }

    public interface ISingleGeneric<T>
    {
    }

    public interface ISingleGenericWithInModifier<in T>
    {
    }

    public interface ISingleGenericWithOutModifier<out T>
    {
    }

    public class CGeneric<T> : ISingleGeneric<T>
    {
    }

    public class CSimple : ISimpleInterface
    {
    }

    public class CDoubleInheritGeneric<T> : ISingleGenericWithInModifier<ISingleGeneric<T>>, ISingleGenericWithInModifier<CGeneric<T>>
    {
    }

    [Fact]
    public void CanResolveComponentWhenItInheritsFromTheSameGenericInterfaceTwice()
    {
        var builder = new ContainerBuilder();

        builder.RegisterGeneric(typeof(CDoubleInheritGeneric<>)).As(typeof(ISingleGenericWithInModifier<>));

        var container = builder.Build();

        // These should resolve because it inherits from ISingleGenericWithInModifier with both as nested generic arguments
        Assert.True(container.IsRegistered<ISingleGenericWithInModifier<ISingleGeneric<int>>>());
        Assert.True(container.IsRegistered<ISingleGenericWithInModifier<CGeneric<int>>>());
        Assert.True(container.IsRegistered<ISingleGenericWithInModifier<ISingleGeneric<CSimple>>>());
        Assert.True(container.IsRegistered<ISingleGenericWithInModifier<CGeneric<CSimple>>>());

        // These should not resolve because they do not match the above pattern
        Assert.False(container.IsRegistered<ISingleGenericWithInModifier<int>>());
        Assert.False(container.IsRegistered<ISingleGenericWithInModifier<ISingleGenericWithOutModifier<int>>>());
        Assert.False(container.IsRegistered<ISingleGenericWithInModifier<ISingleGenericWithOutModifier<CSimple>>>());
    }
}

The fix is to change the call from Single to First on line 109 of OpenGenericServiceBinder in method GetInterface.
I have tested it locally and all tests pass.

I have created PR #871 with the fix and test for the issue

[alexmg]

Fixed by commit e58299b.

[tillig]

Released as 4.6.2.