gistfile1.cs

var tree = CSharpSyntaxTree.ParseText(@"
public class Sample
{
   public void Foo()
   {
        int[] outerArray = new int[10] { 0, 1, 2, 3, 4, 0, 1, 2, 3, 4};
        for (int index = 0; index < 10; index++)
        {
             int[] innerArray = new int[10] { 0, 1, 2, 3, 4, 0, 1, 2, 3, 4 };
             index = index + 2;
             outerArray[index - 1] = 5;
        }
   }
}");
 
var Mscorlib = MetadataReference.CreateFromFile(typeof(object).Assembly.Location);
 
var compilation = CSharpCompilation.Create("MyCompilation",
    syntaxTrees: new[] { tree }, references: new[] { Mscorlib });
var model = compilation.GetSemanticModel(tree);
 
var forStatement = tree.GetRoot().DescendantNodes().OfType<ForStatementSyntax>().Single();
DataFlowAnalysis result = model.AnalyzeDataFlow(forStatement);