...

compiler/NubLang/Diagnostics/Diagnostic.cs

@@ -152,7 +152,7 @@ public class Diagnostic
                 if (i >= startLine && i <= endLine)
                 {
                     var markerStartColumn = 1;
-                    var markerEndColumn = line.Length;
+                    var markerEndColumn = line.Length + 1;
 
                     if (i == startLine)
                     {
@@ -262,6 +262,10 @@ public class Diagnostic
     {
         switch (token)
         {
+            case CommentToken:
+            {
+                return ConsoleColors.Colorize(tokenText, ConsoleColors.Green);
+            }
             case IdentifierToken:
             {
                 return ConsoleColors.Colorize(tokenText, ConsoleColors.BrightWhite);