initial

samples/CS10/CS10.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

samples/CS10/Program.cs

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+namespace CS10 {
+  class Program {
+    // Nested types, just like the C# 8 sample:
+    public class Address {
+      public string? City { get; set; }
+      public string? Country { get; set; }
+    }
+
+    public class Customer {
+      // ...
+      public Address? Address { get; set; }
+    }
+
+    static void Main(string[] args) {
+      // Nested property patterns, now shorter:
+      var customer = new Customer
+      {
+        Address = new Address { City = "Castle Douglas", Country = "UK" }
+      };
+      if (customer is { Address.City: "Castle Douglas" }) {
+        Console.WriteLine("Dieser Kunde wohnt gleich um die Ecke");
+      }
+    }
+  }
+}