NoReturn

internal class NoReturn<TReturn, TException> where TException : Exception
    {
        static NoReturn()
        {
            bool GetCorrectConstructor(ParameterInfo[] parameters) => parameters.Length == 1 && parameters[0].ParameterType == typeof(string);
            var constructors = typeof(TException).GetConstructors();
            var target = Expression.Label();
            var constructor = constructors.Single(c => GetCorrectConstructor(c.GetParameters()));
            var messageExpression = Expression.Parameter(typeof(string), "message");
            var newException = Expression.New(constructor, messageExpression);
            var throwExpression = Expression.Throw(newException, typeof(TReturn));
            var retExp = Expression.Return(target, Expression.Default(typeof(TReturn)));
            var block = Expression.Block(throwExpression, retExp);
            ThrowDelegate = Expression.Lambda<Func<string, TReturn>>(throwExpression, messageExpression).Compile();
        }
        static Func<string, TReturn> ThrowDelegate;
        internal TReturn Throw(string message)
        {
            return ThrowDelegate(message);
        }
    }