Use CreateRuntimeAsyncCompilation helper in test

Copilot · 333fred · Copilot · commit ffac6ec090f0 · 2025-11-04T22:40:29.000Z
- Removed manual parse options and compilation setup
- Now using CreateRuntimeAsyncCompilation helper as specified
- Helper automatically handles runtime-async feature flag and SYSLIB5007 suppression

Co-authored-by: 333fred &lt;2371880+333fred@users.noreply.github.com&gt;
diff --git a/src/Compilers/CSharp/Test/Emit3/Attributes/AttributeTests_Synthesized.cs b/src/Compilers/CSharp/Test/Emit3/Attributes/AttributeTests_Synthesized.cs
@@ -1833,12 +1833,10 @@ public static async Task F()
                 }
                 """;
 
-            var parseOptions = CSharpTestBase.WithRuntimeAsync(TestOptions.RegularPreview);
             var options = TestOptions.CreateTestOptions(OutputKind.DynamicallyLinkedLibrary, optimizationLevel)
-                .WithMetadataImportOptions(MetadataImportOptions.All)
-                .WithSpecificDiagnosticOptions("SYSLIB5007", ReportDiagnostic.Suppress);
+                .WithMetadataImportOptions(MetadataImportOptions.All);
 
-            var compilation = CreateCompilation(source, options: options, parseOptions: parseOptions, targetFramework: TargetFramework.Net100);
+            var compilation = CreateRuntimeAsyncCompilation(source, options);
             var verifier = CompileAndVerify(compilation, verify: Verification.Skipped, symbolValidator: verify);
             verifier.VerifyDiagnostics();
 
