Description

In .NET 8 there is a bug regarding the handling of generic types, which produces a TypeLoadException

Reproduction Steps

ON .NET 8 Compile & run the following C# console application code code:

public interface IGeneric<T>
{
}

public class DualGeneric<T1, T2> where T1 : T2
{
}

public class Record : DualGeneric<Record, IRecord>, IRecord
{
}

public interface IRecord : IGeneric<Record>
{
}

public interface IRecord<T> : IGeneric<Record<T>>
{
}

public class Record<T> : DualGeneric<Record<T>, IRecord<T>>, IRecord<T>
{
}


internal class Program
{
    private static void Main(string[] args)
    {
        var record = new Record<int>();
        Console.WriteLine("Works");
    }
}

Expected behavior

Program prints Works message.

Actual behavior

Actual result: System.TypeLoadException: 'GenericArguments[0], 'Record1[T]', on 'DualGeneric2[T1,T2]' violates the constraint of type parameter 'T1'.'

Regression?

Code runs perfectly fine, when it's targeting .NET 7

Known Workarounds

Run the code on .NET 7

Configuration

• .NET 8
• Windows 10 22H2
• X64
• Shouldn't be specific to configuration

Other information

No response