RCS1016 result doesn't compile fix

ChangeLog.md

@@ -6,6 +6,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+- Fix [RCS1016](https://github.com/JosefPihrt/Roslynator/blob/main/docs/analyzers/RCS1016.md) ([#1090](https://github.com/josefpihrt/roslynator/pull/1090)).
 
 ## [4.3.0] - 2023-04-24
 

src/CSharp/CSharp/SyntaxRewriters/WhitespaceRemover.cs

@@ -33,10 +33,20 @@ public static WhitespaceRemover GetInstance(TextSpan? span = null)
 
     public override SyntaxTrivia VisitTrivia(SyntaxTrivia trivia)
     {
-        if (trivia.IsWhitespaceOrEndOfLineTrivia()
-            && (Span?.Contains(trivia.Span) != false))
-        {
+        if (Span?.Contains(trivia.Span) == false)
+            return base.VisitTrivia(trivia);
+
+        if (trivia.IsKind(SyntaxKind.WhitespaceTrivia))
             return Replacement;
+
+        if (trivia.IsKind(SyntaxKind.EndOfLineTrivia)){
+            // We can only safely remove EndOfLineTrivia if it is not proceeded by a SingleLineComment
+            var triviaIndex = trivia.Token.TrailingTrivia.IndexOf(trivia);
+            if (triviaIndex == 0)
+                return Replacement;
+            var prevTrivia = trivia.Token.TrailingTrivia[triviaIndex - 1];
+            if (!prevTrivia.IsKind(SyntaxKind.SingleLineCommentTrivia))
+                return Replacement;
         }
 
         return base.VisitTrivia(trivia);

src/Tests/Analyzers.Tests/RCS1016UseBlockBodyTests.cs

@@ -246,6 +246,28 @@ string P
 ", options: Options.AddConfigOption(ConfigOptionKeys.BodyStyle, ConfigOptionValues.BodyStyle_Block));
     }
 
+    [Fact, Trait(Traits.Analyzer, DiagnosticIdentifiers.UseBlockBodyOrExpressionBody)]
+    public async Task Test_GetterTrailingComment()
+    {
+        await VerifyDiagnosticAndFixAsync(@"
+class C
+{
+    string P [|=> null|]; // some comment
+}
+", @"
+class C
+{
+    string P
+    {
+        get
+        {
+            return null;// some comment
+        }
+    }
+}
+", options: Options.AddConfigOption(ConfigOptionKeys.BodyStyle, ConfigOptionValues.BodyStyle_Block));
+    }
+
     [Fact, Trait(Traits.Analyzer, DiagnosticIdentifiers.UseBlockBodyOrExpressionBody)]
     public async Task Test_PropertyWithGetter_MultilineExpression()
     {