FWIW I don't get segfaults for Moar anymore. For parrot it's flapping: sometimes I get a segfault, sometimes I don't. The command segfaults more often than it does not:
$ for i in $(seq 1 100); do perl6-p -e 'multi a(:$a!) { "named" }; multi a($a)
{ "positional" }; my $a = "a"; a(a => 1); a("a" => 1); say a(|($a=>1)); say
"alive"' ; done | grep -c alive
7
