I don't know exactly what you mean by a reference pointer. If you mean a pointer, there's no such thing as a pointer, although there is some way to represent pointers in the NativeCall interface (which is properly Rakudo) https://docs.perl6.org/language/traits#index-entry-CPointer. There are no references either, as such. You can bind a variable to another, but there's no special syntax for that.
-- JJ
