public void FindNodeUsingQuery()
{
string text = "class C { void M(int i) { } }";
SyntaxNode root = Syntax.ParseCompilationUnit(text);
var parameterDeclaration = root
.DescendantNodes()
.OfType<ParameterSyntax>()
.First();
Assert.AreEqual("i", parameterDeclaration.Identifier.ValueText);
}