Handle switch expression.

Author: JohanLarsson

IDisposableAnalyzers.Test/IDISP001DisposeCreatedTests/Diagnostics.Local.cs

@@ -33,6 +33,7 @@ public void Dispose()
             [TestCase("null ?? System.IO.File.OpenRead(string.Empty)")]
             [TestCase("true ? null : System.IO.File.OpenRead(string.Empty)")]
             [TestCase("true ? System.IO.File.OpenRead(string.Empty) : null")]
+            [TestCase("o switch { int _ => File.OpenRead(string.Empty), _ => null }")]
             public static void LanguageConstructs(string expression)
             {
                 var code = @"
@@ -41,9 +42,9 @@ namespace N
     using System;
     using System.IO;
 
-    internal class C
+    class C
     {
-        internal C()
+        void M(object o)
         {
             ↓var value = new Disposable();
         }

IDisposableAnalyzers/Helpers/Pooled/RecursiveValues.cs

@@ -135,6 +135,14 @@ private bool AddRecursiveValues(ExpressionSyntax assignedValue)
                     var whenTrue = this.AddRecursiveValues(conditional.WhenTrue);
                     var whenFalse = this.AddRecursiveValues(conditional.WhenFalse);
                     return whenTrue || whenFalse;
+                case SwitchExpressionSyntax { Arms: { } arms }:
+                    var added = false;
+                    foreach (var arm in arms)
+                    {
+                        added |= this.AddRecursiveValues(arm.Expression);
+                    }
+
+                    return added;
                 case AwaitExpressionSyntax awaitExpression:
                     using (var walker = ReturnValueWalker.Borrow(awaitExpression, ReturnValueSearch.RecursiveInside, this.semanticModel, this.cancellationToken))
                     {