Re: [perl #111646] &infix<~> reports an arity of 2 even though it accepts 2

[Moritz Lenz]

Further analysis: the problem is that Signature.count counts the (|$) 
from the proto as a single positional.

The obvious fix from http://moritz.faui2k3.org/tmp/arity.patch doesn't 
work, because List.munch then gets a Num argument, which blows up during 
unboxing.