Fix printing private and protected modifiers

Author: pweisenburger

compiler/src/scala/quoted/runtime/impl/printers/SourceCode.scala

@@ -1368,28 +1368,24 @@ object SourceCode {
 
     private def printProtectedOrPrivate(definition: Definition): Boolean = {
       var prefixWasPrinted = false
-      def printWithin(within: TypeRepr) = within match {
-        case TypeRef(_, name) => this += name
-        case _ => printFullClassName(within)
-      }
-      if (definition.symbol.flags.is(Flags.Protected)) {
+      def printWithin(within: Option[TypeRepr]) = within match
+        case _ if definition.symbol.flags.is(Flags.Local) => inSquare(this += "this")
+        case Some(TypeRef(_, name)) => inSquare(this += name)
+        case Some(within) => inSquare(printFullClassName(within))
+        case _ =>
+
+      if definition.symbol.flags.is(Flags.Protected) then
         this += highlightKeyword("protected")
-        definition.symbol.protectedWithin match {
-          case Some(within) =>
-            inSquare(printWithin(within))
-          case _ =>
-        }
+        printWithin(definition.symbol.protectedWithin)
         prefixWasPrinted = true
-      } else {
-        definition.symbol.privateWithin match {
-          case Some(within) =>
-            this += highlightKeyword("private")
-            inSquare(printWithin(within))
-            prefixWasPrinted = true
-          case _ =>
-        }
-      }
-      if (prefixWasPrinted)
+      else
+        val privateWithin = definition.symbol.privateWithin
+        if privateWithin.isDefined || definition.symbol.flags.is(Flags.Private) then
+          this += highlightKeyword("private")
+          printWithin(definition.symbol.privateWithin)
+          prefixWasPrinted = true
+
+      if prefixWasPrinted then
         this += " "
       prefixWasPrinted
     }