Force highlighting again

Since we only highlight strings...

Author: Blaisorblade

compiler/src/dotty/tools/dotc/parsing/Parsers.scala

@@ -2418,12 +2418,12 @@ object Parsers {
 
       def flagPos(flag: FlagSet) = mods.mods.find(_.flags == flag).get.pos
       if (mods is Abstract)
-        syntaxError(hl"""${Abstract} modifier cannot be used for objects""", flagPos(Abstract))
+        syntaxError(hl"""${Abstract.toString} modifier cannot be used for objects""", flagPos(Abstract))
       if (mods is Sealed)
-        syntaxError(hl"""${Sealed} modifier is redundant for objects""", flagPos(Sealed))
+        syntaxError(hl"""${Sealed.toString} modifier is redundant for objects""", flagPos(Sealed))
       // Maybe this should be an error; see https://github.com/scala/bug/issues/11094.
       if (mods is Final)
-        warning(hl"""${Final} modifier is redundant for objects""", source atPos flagPos(Final))
+        warning(hl"""${Final.toString} modifier is redundant for objects""", source atPos flagPos(Final))
 
       finalizeDef(ModuleDef(name, template), mods, start)
     }