private ISet <VariableAlias> _CollectAliases(string source)
{
var semanticModel = _documentFactory.CreateSemanticModel(source);
var forStatement = semanticModel.SyntaxTree.GetRoot().DescendantNodes().OfType <ForStatementSyntax>().Single();
var code = CodeFactory.Create(forStatement, semanticModel);
var variableAccesses = VariableAccesses.Collect(code);
var cfg = ControlFlowGraphFactory.Create(code);
return(ExternalArrayAliasCollector.Collect(semanticModel, forStatement, variableAccesses));
}
