[perl #69272] [TODO] Implement .succ and .pred for Rat

[Carl Mäsak]

# New Ticket Created by  "Carl Mäsak" 
# Please include the string:  [perl #69272]
# in the subject line of all future correspondence about this issue. 
# <URL: http://rt.perl.org/rt3/Ticket/Display.html?id=69272 >


<masak> rakudo: my $a = 3/4; $a++
<p6eval> rakudo 5d3d3a: OUTPUT«Method 'succ' not found for invocant of
class 'Rat'␤»
* masak submits rakudobug