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

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?

Start by reproducing the generic MyParser[A] declaration shown in the issue, then inspect the RegexParsers and PackratParsers trait definitions involved in the phrase method error. Done means establishing whether the declaration can compile or documenting a supported workaround; the payload names no files or tests.