Iterative source generator reusing types from previous iterations

Generator.cs

using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.Text;

[Generator]
public class Generator : ISourceGenerator
{
  private const int myEnoughIsEnough = 10;
  private const string TypeNamePrefix = "Generated";

  public void Initialize(InitializationContext context)
  {
  }

  public virtual void Execute(SourceGeneratorContext context)
  {
    var compilation = context.Compilation;
    CSharpParseOptions options = (CSharpParseOptions) ((CSharpCompilation)context.Compilation).SyntaxTrees[0].Options;
    for (var x = 0; x < myEnoughIsEnough; x++)
    {
      var allGeneratedTypes = new List<INamedTypeSymbol>();
      foreach (var syntaxTree in compilation.SyntaxTrees)
      {
        var model = compilation.GetSemanticModel(syntaxTree);
        var typeSymbols = syntaxTree.GetRoot()
          .DescendantNodesAndSelf()
          .OfType<ClassDeclarationSyntax>()
          .Select(x => model.GetDeclaredSymbol(x))
          .Where(x=> x.Name.StartsWith(TypeNamePrefix));
        allGeneratedTypes.AddRange(typeSymbols);
      }

      var previousType = allGeneratedTypes.OrderByDescending(x => x.Name).FirstOrDefault();
      var source = GetSource(previousType, allGeneratedTypes, x);

      context.AddSource(TypeNamePrefix+x, SourceText.From(source, Encoding.UTF8));
      compilation = compilation.AddSyntaxTrees(CSharpSyntaxTree.ParseText(source, options));
    }
  }

  public static string GetSource(INamedTypeSymbol? previousType, IReadOnlyList<INamedTypeSymbol> symbols, int x)
    =>  $@"
using System;
public static class {TypeNamePrefix}{x}
{{
  public static void Print()
  {{
    Console.WriteLine(""Hello from type number {x}"");
    Console.WriteLine(""Following types are already added: { string.Join(";", symbols.Select(x=>x.Name)) }"");
    {(previousType != null ? $"{previousType.Name}.Print();" : "Console.WriteLine(\"Root\");")}
  }}
}}";
}