Show position of code snippets that failed to compile

Author: WojciechMazur

scaladoc/src/dotty/tools/scaladoc/snippets/SnippetCompiler.scala

@@ -86,7 +86,9 @@ class SnippetCompiler(
 
   private def additionalMessages(wrappedSnippet: WrappedSnippet, arg: SnippetCompilerArg, sourceFile: SourceFile, context: Context): Seq[SnippetCompilerMessage] = {
       Option.when(arg.flag == SCFlags.Fail && !context.reporter.hasErrors)(
-        SnippetCompilerMessage(None, "Snippet should not compile but compiled successfully", MessageLevel.Error)
+        SnippetCompilerMessage(
+          Some(Position(SourcePosition(sourceFile, NoSpan), wrappedSnippet.outerLineOffset)),
+          "Snippet should not compile but compiled successfully", MessageLevel.Error)
       ).toList
   }