public void TestIsInstance()
        {
            Assert.False(VariableDesignationSyntaxWrapper.IsInstance(null));
            Assert.False(VariableDesignationSyntaxWrapper.IsInstance(SyntaxFactory.LiteralExpression(SyntaxKind.NullLiteralExpression)));

            var discardDesignationSyntax = SyntaxFactory.DiscardDesignation();

            Assert.True(VariableDesignationSyntaxWrapper.IsInstance(discardDesignationSyntax));
        }