[perl #68988] Empty return value causes Null PMC access in find_method() when passed to another routine

[via RT]

# New Ticket Created by  Moritz Lenz 
# Please include the string:  [perl #68988]
# in the subject line of all future correspondence about this issue. 
# <URL: http://rt.perl.org/rt3/Ticket/Display.html?id=68988 >


Nicely reduced by masak++:

14:16 < masak> rakudo: sub foo { for 1 {} }; sub bar($x) {}; bar(foo)
14:16 <+p6eval> rakudo b51d94: OUTPUT«Null PMC access in
find_method()␤in sub
                bar (/tmp/Wf45L47gN6:2)␤called from Main
(/tmp/Wf45L47gN6:2)␤»

The same happens if the it's a method call ($obj.bar(foo)).