Merge commit '5652924a8fd5f3a9ea5032d8841ba25e60c8354a'

Workbench/DohefurweBigurqice/DohefurweBigurqice.csproj

@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

Workbench/DohefurweBigurqice/DohefurweBigurqice.sln

@@ -0,0 +1,22 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.0.31903.59
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "DohefurweBigurqice", "DohefurweBigurqice.csproj", "{EAA2C713-0E0C-48D5-A9FF-40BFC75663C9}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{EAA2C713-0E0C-48D5-A9FF-40BFC75663C9}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{EAA2C713-0E0C-48D5-A9FF-40BFC75663C9}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{EAA2C713-0E0C-48D5-A9FF-40BFC75663C9}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{EAA2C713-0E0C-48D5-A9FF-40BFC75663C9}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+EndGlobal

Workbench/DohefurweBigurqice/Program.cs

@@ -0,0 +1,25 @@
+// See https://aka.ms/new-console-template for more information
+
+var list = new List<Foo>();
+
+for (int i = 0; i < 10; i++)
+{
+    list.Add(new Foo());
+}
+
+Foo? foo = list.Cast<Foo?>().FirstOrDefault(t => t.Value.N == -1, null);
+
+Console.WriteLine("Hello, World!");
+
+
+struct Foo
+{
+    public Foo()
+    {
+        _count++;
+        N = _count;
+    }
+    public int N { get; }
+
+    private static int _count = 0;
+}