Example metadata: expressions.md, revisited (#718)

* have example generate output

* minor tweak to example

* use new template code-in-partial-class

* Create Library.cs

* Create Project.csproj

* Create Caller.cs

Author: RexJaeschke

standard/expressions.md

@@ -4753,7 +4753,6 @@ If a for-loop declares an iteration variable, that variable itself is considered
 > *Example*: Thus, if the example is changed to capture the iteration variable itself:
 >
 > <!-- Example: {template:"standalone-console", name:"InstantiationOfLocalVariables5", inferOutput: true} -->
-> <!-- Maintenance Note: A version of this delegate type exists in additional-files as "DvoidNoArgs.cs". As such, certain changes to this type definition might need to be reflected in that file, in which case, *all* examples using that file should be tested. -->
 > ```csharp
 > delegate void D();
 >
@@ -4793,7 +4792,7 @@ It is possible for anonymous function delegates to share some captured variables
 
 > *Example*: For example, if `F` is changed to
 >
-> <!-- Example: {template:"standalone-console", name:"InstantiationOfLocalVariables6", IgnoredWarnings:["CS8321"], additionalFiles:["DvoidNoArgs.cs"]} -->
+> <!-- Example: {template:"code-in-partial-class", name:"InstantiationOfLocalVariables6", IgnoredWarnings:["CS8321"], additionalFiles:["Caller.cs"], inferOutput: true} -->
 > ```csharp
 > static D[] F()
 > {
@@ -4808,7 +4807,15 @@ It is possible for anonymous function delegates to share some captured variables
 > }
 > ```
 >
-> the three delegates capture the same instance of `x` but separate instances of `y`. *end example*
+> the three delegates capture the same instance of `x` but separate instances of `y`, and the output is:
+>
+> ```console
+> 1 1
+> 2 1
+> 3 1
+> ```
+>
+> *end example*
 
 Separate anonymous functions can capture the same instance of an outer variable.
 

tools/example-templates/additional-files/Caller.cs

@@ -0,0 +1,12 @@
+delegate void D();
+
+partial class Class1
+{
+   static void Main()
+   {
+       foreach (D d in F())
+       {
+           d();
+       }
+   }
+}

tools/example-templates/code-in-partial-class/Library.cs

@@ -0,0 +1,17 @@
+using System;
+using System.Collections.Generic;
+using System.Collections;
+using System.Diagnostics;
+using System.IO;
+using System.Linq.Expressions;
+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+using System.Security.Permissions;
+using System.Text;
+using System.Threading;
+
+partial class Class1
+{
+    $example-code
+}

tools/example-templates/code-in-partial-class/Project.csproj

@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <AssemblyName>$example-name</AssemblyName>
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+  </PropertyGroup>
+
+</Project>