[perl #61206] :x($n) where $n ~~ Range doesn't work properly in Rakudo

[Patrick R. Michaud via RT]

On Mon Dec 22 16:41:53 2008, zev wrote:
> Oops.  The last patch wasn't quite right.  This one passes the tests
> (which I found).  I also added spectests that are marked TODO (but which
> pass with this patch applied).

I would prefer to see this done by using a smart match on the :x()
argument instead of explicitly checking it for a Range and grabbing
min/max from there.  Using a smart match would allow things like
:x(1|5|7) and :x({ .is_prime })  to work properly.

Pm