[perl #130064] [BUG] IO::Socket::Async sometimes gives "bindexpayload needs a VMExceptio"

[via RT]

# New Ticket Created by  Zoffix Znet 
# Please include the string:  [perl #130064]
# in the subject line of all future correspondence about this issue. 
# <URL: https://rt.perl.org/Ticket/Display.html?id=130064 >



I can only reproduce it on camelia and the issue happens when  
connecting to an IPv6 address:

     m: await  
IO::Socket::Async.connect("260​0:3c03::f03c:91ff:fe91:d028", 80).then:  
-> $p { if $p.status { given $p.result { .print: "GET / HTTP/1.0\n\n";  
react { whenever .Supply { .say } } } } }
     rakudo-moar b46a62: OUTPUT«===SORRY!===␤bindexpayload needs a  
VMException␤»

On other boxes, the code either succeeds, gives "unable to resolve  
hostname" or gives "network is unreachable"

IRC conversation: https://irclog.perlgeek.de/perl6/2016-11-09#i_13539836

P.S: timotimo just pushed a commit to MoarVM to give extra debug info  
for this:  
https://github.com/MoarVM/MoarVM/commit/4c9fd00c5882dcafff48e7e41394f70c14d2390a