[ruby] Parenthesis-less Calls with &. Parser Rule Missing

[DavidBakerEffendi]

Below shows an example of the code

class Foo
  def bar(arg)
    return arg
  end
end

foo = Foo.new
foo&.bar x # <-- no call, only `foo` identifier detected

What is interesting is that foo&.bar(x) works. So the parser rule for simply expecting the argument list does not include the way the call member is accessed.

Might be worth determining if this is valid syntax before solving.