diff --git a/fundamentals/aot/diagnostics/Rdg10/Program.cs b/fundamentals/aot/diagnostics/Rdg10/Program.cs
new file mode 100644
index 0000000..443f806
--- /dev/null
+++ b/fundamentals/aot/diagnostics/Rdg10/Program.cs
@@ -0,0 +1,36 @@
+#define RDG10F //   RDG10 RDG10F
+#if NEVER
+#elif RDG10
+// <snippet_1>
+using Microsoft.AspNetCore.Mvc;
+
+var builder = WebApplication.CreateBuilder(args);
+
+var app = builder.Build();
+
+app.MapGet("/todos/{id}", ([AsParameters] TodoRequest? request)
+    => Results.Ok(new Todo(request!.Id)));
+
+app.Run();
+
+public record TodoRequest(HttpContext HttpContext, [FromRoute] int Id);
+public record Todo(int Id);
+// </snippet_1>
+#elif RDG10F
+// <snippet_1f>
+using Microsoft.AspNetCore.Mvc;
+
+var builder = WebApplication.CreateBuilder(args);
+
+var app = builder.Build();
+
+app.MapGet("/todos/{id}", ([AsParameters] TodoRequest request)
+    => Results.Ok(new Todo(request.Id)));
+
+app.Run();
+
+public record TodoRequest(HttpContext HttpContext, [FromRoute] int Id);
+public record Todo(int Id);
+// </snippet_1f>
+#endif
+
diff --git a/fundamentals/aot/diagnostics/Rdg10/Rdg10.csproj b/fundamentals/aot/diagnostics/Rdg10/Rdg10.csproj
new file mode 100644
index 0000000..78554ea
--- /dev/null
+++ b/fundamentals/aot/diagnostics/Rdg10/Rdg10.csproj
@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <InvariantGlobalization>true</InvariantGlobalization>
+    <EnableRequestDelegateGenerator>true</EnableRequestDelegateGenerator>
+  </PropertyGroup>
+
+</Project>