Fix analyzer RCS1198 (#1501)

Author: josefpihrt

ChangeLog.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Fixed
 
 - Fix analyzer [RCS1182](https://josefpihrt.github.io/docs/roslynator/analyzers/RCS1182) ([PR](https://github.com/dotnet/roslynator/pull/1502))
+- Fix analyzer [RCS1198](https://josefpihrt.github.io/docs/roslynator/analyzers/RCS1198) ([PR](https://github.com/dotnet/roslynator/pull/1501))
 
 ## [4.12.4] - 2024-06-01
 

src/Analyzers/CSharp/Analysis/AvoidBoxingOfValueTypeAnalyzer.cs

@@ -28,7 +28,13 @@ public override void Initialize(AnalysisContext context)
     {
         base.Initialize(context);
 
-        context.RegisterSyntaxNodeAction(f => AnalyzeInterpolation(f), SyntaxKind.Interpolation);
+        context.RegisterCompilationStartAction(startContext =>
+        {
+            INamedTypeSymbol exceptionSymbol = startContext.Compilation.GetTypeByMetadataName("System.Runtime.CompilerServices.DefaultInterpolatedStringHandler");
+
+            if (exceptionSymbol is null)
+                startContext.RegisterSyntaxNodeAction(f => AnalyzeInterpolation(f), SyntaxKind.Interpolation);
+        });
     }
 
     private static void AnalyzeInterpolation(SyntaxNodeAnalysisContext context)

src/Tests/Analyzers.Tests/RCS1198AvoidBoxingOfValueTypeTests.cs

@@ -12,66 +12,6 @@ public class RCS1198AvoidBoxingOfValueTypeTests : AbstractCSharpDiagnosticVerifi
 {
     public override DiagnosticDescriptor Descriptor { get; } = DiagnosticRules.AvoidBoxingOfValueType;
 
-    [Fact, Trait(Traits.Analyzer, DiagnosticIdentifiers.AvoidBoxingOfValueType)]
-    public async Task Test_Interpolation()
-    {
-        await VerifyDiagnosticAndFixAsync("""
-using System;
-
-class C
-{
-    public TimeSpan P { get; }
-
-    void M()
-    {
-        var c = new C();
-
-        var x = $"{[|c?.P.TotalMilliseconds|]}";
-    }
-}
-""", """
-using System;
-
-class C
-{
-    public TimeSpan P { get; }
-
-    void M()
-    {
-        var c = new C();
-
-        var x = $"{(c?.P.TotalMilliseconds).ToString()}";
-    }
-}
-""");
-    }
-
-    [Fact, Trait(Traits.Analyzer, DiagnosticIdentifiers.AvoidBoxingOfValueType)]
-    public async Task Test_Interpolation_NullableType()
-    {
-        await VerifyDiagnosticAndFixAsync("""
-class C
-{
-    void M()
-    {
-        int? i = null;
-
-        string s = $"{[|i|]}";
-    }
-}
-""", """
-class C
-{
-    void M()
-    {
-        int? i = null;
-
-        string s = $"{i?.ToString()}";
-    }
-}
-""");
-    }
-
     // https://github.com/dotnet/roslyn/pull/35006
     [Fact, Trait(Traits.Analyzer, DiagnosticIdentifiers.AvoidBoxingOfValueType)]
     public async Task TestNoDiagnostic_StringConcatenation()