fix(analyzers): report RCS1046 for async void methods

ChangeLog.md

@@ -9,6 +9,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 
+- Fix analyzer [RCS1046](https://josefpihrt.github.io/docs/roslynator/analyzers/RCS1046) to report `async void` methods without `Async` suffix ([PR](https://github.com/dotnet/roslynator/pull/1790))
+- Fix analyzer [RCS1265](https://josefpihrt.github.io/docs/roslynator/analyzers/RCS1265) to not report catch clauses with a `when` filter ([PR](https://github.com/dotnet/roslynator/pull/1789))
 - Fix analyzer [RCS0034](https://josefpihrt.github.io/docs/roslynator/analyzers/RCS0034) for types with a primary constructor and multiple constraint clauses ([PR](https://github.com/dotnet/roslynator/pull/1791))
 
 ## [4.16.0] - 2026-08-08

src/Analyzers/CSharp/Analysis/NonAsynchronousMethodNameShouldNotEndWithAsyncAnalyzer.cs

@@ -101,7 +101,8 @@ private static void AnalyzeMethodDeclaration(SyntaxNodeAnalysisContext context)
             if (methodSymbol.ImplementsInterfaceMember(allInterfaces: true))
                 return;
 
-            if (!methodSymbol.ReturnType.IsAwaitable(context.SemanticModel, methodDeclaration.SpanStart)
+            if (!methodSymbol.IsAsync
+                && !methodSymbol.ReturnType.IsAwaitable(context.SemanticModel, methodDeclaration.SpanStart)
                 && !methodSymbol.ReturnType.OriginalDefinition.HasMetadataName(in MetadataNames.System_Collections_Generic_IAsyncEnumerable_T))
             {
                 return;

src/Tests/Analyzers.Tests/RCS1046AsynchronousMethodNameShouldEndWithAsyncTests.cs

@@ -136,6 +136,19 @@ public void OnCompleted(System.Action continuation) { }
 ");
     }
 
+    [Fact, Trait(Traits.Analyzer, DiagnosticIdentifiers.AsynchronousMethodNameShouldEndWithAsync)]
+    public async Task Test_AsyncVoid()
+    {
+        await VerifyDiagnosticAsync(@"
+class C
+{
+    async void [|Foo|]()
+    {
+    }
+}
+", options: Options.AddAllowedCompilerDiagnosticId("CS1998"));
+    }
+
     [Fact, Trait(Traits.Analyzer, DiagnosticIdentifiers.AsynchronousMethodNameShouldEndWithAsync)]
     public async Task TestNoDiagnostic_EntryPointMethod()
     {