Declaration "class MyParser[A] extends RegexParsers with PackratParsers" does not compile

[oreshkor]

I wish to declare concrete class with a type parameter but scala compiler does not allow to do this if it extends both traits RegexParsers and PackratParsers simultaneously.
Compilation error says:

illegal trait super target found for method phrase required by trait PackratParsers;
[error]  found   : override def phrase: ([T](p: _1.Parser[T]): _1.Parser[T])( forSome { val _1: [A]MyParser[A] }) in trait RegexParsers;
[error]  expected: def phrase: ([T](p: _1.Parser[T]): _1.Parser[T])( forSome { val _1: [A]MyParser[A] }) in trait Parsers

Is there any way how to bypass this?

[SethTisue]

REPL session demonstrating the issue:

scala> import scala.util.parsing.combinator._
import scala.util.parsing.combinator._

scala> class SimpleParser extends RegexParsers with PackratParsers
class SimpleParser

scala> class SimpleParser[A] extends RegexParsers with PackratParsers
             ^
       error: illegal trait super target found for method phrase required by trait PackratParsers;
        found   : override def phrase: ([T](p: _1.Parser[T]): _1.Parser[T]) forSome { val _1: [A]SimpleParser[A] } in trait RegexParsers;
        expected: def phrase: ([T](p: _1.Parser[T]): _1.Parser[T]) forSome { val _1: [A]SimpleParser[A] } in trait Parsers

Note that Scala 3 actually accepts this code.

RegexParsers has:

  override def phrase[T](p: Parser[T]): Parser[T] = ...

whereas PackratParsers has:

  override def phrase[T](p: Parser[T]): PackratParser[T] = ...

I don't understand it would matter whether SimpleParser has a type parameter or not.