BUGFIX IDISP004 when identity function.

Fix #174

Author: JohanLarsson

IDisposableAnalyzers.Test/IDISP004DoNotIgnoreCreatedTests/Valid.ExtensionMethod.cs

@@ -1,4 +1,4 @@
-namespace IDisposableAnalyzers.Test.IDISP004DoNotIgnoreCreatedTests
+namespace IDisposableAnalyzers.Test.IDISP004DoNotIgnoreCreatedTests
 {
     using Gu.Roslyn.Asserts;
     using NUnit.Framework;
@@ -222,5 +222,44 @@ public void Dispose()
 }";
             RoslynAssert.Valid(Analyzer, code, extCode, DisposableCode, wrappingDisposableCode);
         }
+
+        [Test]
+        public static void Issue174()
+        {
+            var code = @"
+namespace Gu.Inject.Tests
+{
+    using System;
+    using NUnit.Framework;
+
+    public class Sandbox
+    {
+        [Test]
+        public void M()
+        {
+            using (var kernel = new Kernel().AutoBind<int>())
+            {
+            }
+        }
+    }
+
+    public class Kernel : IDisposable
+    {
+        public void Dispose()
+        {
+        }
+    }
+
+    public static class KernelExtensions
+    {
+        public static Kernel AutoBind<T>(this Kernel kernel)
+        {
+            return kernel;
+        }
+    }
+}";
+
+            RoslynAssert.Valid(Analyzer, code);
+        }
     }
 }

IDisposableAnalyzers/Helpers/Walkers/DisposableWalker.Disposes.cs

@@ -3,7 +3,6 @@
     using System.Threading;
     using Gu.Roslyn.AnalyzerExtensions;
     using Microsoft.CodeAnalysis;
-    using Microsoft.CodeAnalysis.CSharp;
     using Microsoft.CodeAnalysis.CSharp.Syntax;
 
     internal sealed partial class DisposableWalker
@@ -96,8 +95,7 @@ internal static bool Disposes(ILocalSymbol local, SemanticModel semanticModel, C
                 switch (declaration)
                 {
                     case { Parent: VariableDeclarationSyntax { Parent: UsingStatementSyntax _ } }:
-                    case { Parent: VariableDeclarationSyntax { Parent: LocalDeclarationStatementSyntax { UsingKeyword: var usingKeywod } } }
-                        when usingKeywod.IsKind(SyntaxKind.UsingKeyword):
+                    case { Parent: VariableDeclarationSyntax { Parent: LocalDeclarationStatementSyntax { UsingKeyword: { ValueText: "using" } } } }:
                         return true;
                 }
             }
@@ -140,7 +138,7 @@ private static bool Disposes(ExpressionSyntax candidate, Recursion recursion)
             {
                 { Parent: UsingStatementSyntax _ }
                 => true,
-                { Parent: EqualsValueClauseSyntax { Parent: VariableDeclaratorSyntax { Parent: UsingStatementSyntax _ } } }
+                { Parent: EqualsValueClauseSyntax { Parent: VariableDeclaratorSyntax { Parent: VariableDeclarationSyntax { Parent: UsingStatementSyntax _ } } } }
                 => true,
                 { Parent: EqualsValueClauseSyntax { Parent: VariableDeclaratorSyntax { Parent: VariableDeclarationSyntax { Parent: LocalDeclarationStatementSyntax { UsingKeyword: { ValueText: "using" } } } } } }
                 => true,