[perl #68086] [BUG] I can haz two identcal variables in my parameter list, and Rakudo doesn't complain even a little!

[Carl Mäsak]

# New Ticket Created by  "Carl Mäsak" 
# Please include the string:  [perl #68086]
# in the subject line of all future correspondence about this issue. 
# <URL: http://rt.perl.org/rt3/Ticket/Display.html?id=68086 >


<masak> rakudo: sub foo($a, $a) { say $a }; foo(42, 5)
<p6eval> rakudo e02bc0: OUTPUT«5␤»
<masak> hah!
* masak submits rakudobug