public override ExpressionKind Eat(ISnapshot snapshot, IReferenceExpression expression)
        {
            var parentKind = expression.QualifierExpression != null
                ? Eater.Eat(snapshot, expression.QualifierExpression)
                : ExpressionKind.None;

            if (parentKind == ExpressionKind.None)
            {
                var declaredElement = _eatExpressionHelper.GetReferenceElement(expression);

                // TODO: declared element can be method: case: event += obj.Method;
                // TODO: declared element can be parameter
                // TODO: Property(Field) can be Stub, Mock or Target
                if (declaredElement is IProperty)
                {
                    return(_typeEater.EatVariableType(snapshot, (declaredElement as IProperty).Type));
                }

                if (declaredElement is IField)
                {
                    return(_typeEater.EatVariableType(snapshot, (declaredElement as IField).Type));
                }

                if (declaredElement is IEvent)
                {
                    return(ExpressionKind.Stub);
                }

                if (declaredElement is ILocalConstantDeclaration)
                {
                    return(ExpressionKind.Stub);
                }

                if (declaredElement is IVariableDeclaration)
                {
                    return(snapshot.GetVariableKind(declaredElement as IVariableDeclaration));
                }

                if (declaredElement is IClass)
                {
                    return(ExpressionKind.None);
                }

                throw new UnexpectedReferenceTypeException(declaredElement, this, expression);
            }
            else
            {
                return(_kindHelper.ReferenceKindByParentReferenceKind(parentKind));
            }
        }
        public override ExpressionKind Eat(ISnapshot snapshot, IAssignmentExpression expression)
        {
            var sourceKind = Eater.Eat(snapshot, expression.Source);

            if (expression.Dest is IReferenceExpression)
            {
                var assignmentKind  = _expressionKindHelper.KindOfAssignment(sourceKind);
                var declaredElement = _eatExpressionHelper.GetReferenceElement(expression.Dest as IReferenceExpression);
                if (declaredElement is IVariableDeclaration)
                {
                    return(EatVariableDeclaration(snapshot, declaredElement as IVariableDeclaration, assignmentKind));
                }
            }

            throw new UnexpectedAssignDestinationException(expression.Dest, this, expression);
        }