[perl #66352] reduce with user-defined sub fail

[via RT]

# New Ticket Created by  Daniel Ruoso 
# Please include the string:  [perl #66352]
# in the subject line of all future correspondence about this issue. 
# <URL: http://rt.perl.org/rt3/Ticket/Display.html?id=66352 >


<ruoso> rakudo: multi a (Str $a, Str $b) { [+$a, +$b] }; multi a (Array
$a, $b where '+') { [+] @($a) }; ('1', '2', '+').reduce: &a;
<p6eval> rakudo fb2fd4: OUTPUT«Unknown introspection value
'pos_required'␤in method Any::reduce (src/gen_setting.pm:3226)␤called
from Main (/tmp/MvPkx61zJn:2)␤»

daniel