Add return statement expression to the list

Author: StanleySweet

src/Creedengo.Core/Analyzers/GCI95.UseIsOperatorInsteadOfAsOperator.cs

@@ -28,7 +28,8 @@ public override void Initialize(AnalysisContext context)
             SyntaxKind.ConditionalExpression,
             SyntaxKind.WhileStatement,
             SyntaxKind.DoStatement,
-            SyntaxKind.ForStatement
+            SyntaxKind.ForStatement,
+            SyntaxKind.ReturnStatement
         ];
 
         foreach (var item in supportSyntaxKinds)
@@ -46,6 +47,7 @@ private void AnalyzeNode(SyntaxNodeAnalysisContext context)
             WhileStatementSyntax whileStatement => whileStatement.Condition,
             DoStatementSyntax dowhileStatement => dowhileStatement.Condition,
             ConditionalExpressionSyntax conditionalExpression => conditionalExpression.Condition,
+            ReturnStatementSyntax returnStatement => returnStatement.Expression,
             _ => null
         };
 

src/Creedengo.Tests/Tests/GCI95.UseIsOperatorInsteadOfAsOperator.Tests.cs

@@ -97,6 +97,27 @@ void TestMethod()
         }
         """);
 
+
+    [TestMethod]
+    public Task DoNotUseAsOperatorInsteadOfIsReturnAsync() => VerifyAndFixAsync("""
+        class TestClass
+        {
+            bool TestMethod(string x)
+            {
+                return [|x as string|] != null;
+            }
+        }
+        """,
+        """
+        class TestClass
+        {
+            bool TestMethod(string x)
+            {
+                return x is string;
+            }
+        }
+        """);
+
     [TestMethod]
     public Task DoNotUseAsOperatorInsteadOfIsDoWhileLoopAsync() => VerifyAndFixAsync("""
         class TestClass