private static HashSet<MethodInfo> GetEmbedMethods()
 {
     var embeds = new LambdaExpression[]
     {
       (Expression<Func<object>>) (() => ExpressionBuilder.Embed<object>(null)),
       (Expression<Func<object>>) (() => ExpressionBuilder.Embed<object, object>(null, null)),
       (Expression<Func<object>>) (() => ExpressionBuilder.Embed<object, object, object>(null, null, null)),
       (Expression<Func<object>>) (() => ExpressionBuilder.Embed<object, object, object, object>(null, null, null, null)),
       (Expression<Func<object>>) (() => ExpressionBuilder.Embed<object, object, object, object, object>(null, null, null, null, null)),
     };
       return new HashSet<MethodInfo>(embeds.Select(e => ((MethodCallExpression) e.Body).Method.GetGenericMethodDefinition()));
 }