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using System.IO;
using System;
 
class Program // for compilation purposes
{
    private static void Main(string[] args)
    {
        return;
    }
}
 
 
public abstract class Emulator<T> where T : Emulator<T>.EmulatorState
{
    public abstract class EmulatorState
    {
    }
    public interface IOpcode
    {
    }
}
 
class Chip8 : Emulator<Chip8.Chip8State>
{
    public class Chip8State : EmulatorState
    {
    }
}
 
abstract class Chip8Opcode<T> : Emulator<T>.IOpcode where T : Chip8.Chip8State
{
}

prog.cs(30,16): error CS0314: The type `T' cannot be used as type parameter `T' in the generic type or method `Emulator<T>'. There is no boxing or type parameter conversion from `T' to `Emulator<T>.EmulatorState'
prog.cs(13,32): (Location of the symbol related to previous error)
Compilation failed: 1 error(s), 0 warnings

Standard output is empty