Add comments and todo

Author: Philippus

shared/src/main/scala/scala/util/parsing/combinator/PackratParsers.scala

@@ -107,7 +107,7 @@ trait PackratParsers extends Parsers {
     val q = super.phrase(p)
     new PackratParser[T] {
       def apply(in: Input) = in match {
-        case in if in.isInstanceOf[PackratReader[_]] => q(in)
+        case in if in.isInstanceOf[PackratReader[_]] => q(in) // TODO: try to change back to "case in: PackratReader[_]" after https://github.com/lampepfl/dotty/pull/8413
         case in => q(new PackratReader(in))
       }
     }

shared/src/main/scala/scala/util/parsing/combinator/Parsers.scala

@@ -664,7 +664,8 @@ trait Parsers {
    *  @return a Parser that recognizes a specified list of elements
    */
   def acceptSeq[ES](es: ES)(implicit f: ES => Iterable[Elem]): Parser[List[Elem]] = {
-    f(es).foldRight[Parser[List[Elem]]](success(Nil)){(x, pxs) => accept(x) ~ pxs ^^ mkList}
+    f(es) // explicit conversion for dotty
+      .foldRight[Parser[List[Elem]]](success(Nil)){(x, pxs) => accept(x) ~ pxs ^^ mkList}
   }
 
   /** A parser that always fails.

shared/src/main/scala/scala/util/parsing/combinator/syntactical/StandardTokenParsers.scala

@@ -25,7 +25,7 @@ import scala.language.implicitConversions
  */
 class StandardTokenParsers extends StdTokenParsers {
   type Tokens = StdTokens
-  val lexical: StdLexical = new StdLexical()
+  val lexical: StdLexical = new StdLexical() // type annotation added for dotty
 
   //an implicit keyword function that gives a warning when a given word is not in the reserved/delimiters list
   override implicit def keyword(chars : String): Parser[String] =